diff --git a/EGFramework.csproj b/EGFramework.csproj
index 0390623..da44c03 100644
--- a/EGFramework.csproj
+++ b/EGFramework.csproj
@@ -12,6 +12,9 @@
     <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
     <PackageReference Include="WebDav.Client" Version="2.8.0" />
     <PackageReference Include="MQTTnet" Version="4.3.3.952" />
-    <PackageReference Include="BACnet" Version="2.0.4" />
+    <PackageReference Include="Makaretu.Dns.Multicast" Version="0.27.0" />
+    <PackageReference Include="PacketDotNet" Version="0.19.3" />
+    <PackageReference Include="SharpPcap" Version="4.5.0" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Ini" Version="8.0.0" />
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/Example/UsingTest/Script/EGTest.cs b/Example/UsingTest/Script/EGTest.cs
index 60809eb..93488e8 100644
--- a/Example/UsingTest/Script/EGTest.cs
+++ b/Example/UsingTest/Script/EGTest.cs
@@ -6,308 +6,310 @@ using Newtonsoft.Json;
 using System;
 using System.Net;
 
-public partial class EGTest : Node,IEGFramework
-{
-    public Label label { set; get; }
-
-    public override void _Ready()
-    {
-        this.EGEnabledProtocolTools();
-        
-        this.EGMqtt().ConnectMQTTServer("192.168.1.220");
-        
-        //this.EGUDP().UDPDevices[5555].Connect(IPAddress.Parse("224.0.0.251"),5353);
-        //byte[] sendData = { 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x5F, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0x07, 0x5F, 0x64, 0x6E, 0x73, 0x2D, 0x73, 0x64, 0x04, 0x5F, 0x75, 0x64, 0x70, 0x05, 0x6C, 0x6F, 0x63, 0x61, 0x6C, 0x00, 0x00, 0x0C, 0x00, 0x01 };
-        //this.EGUDP().UDPDevices[5555].Send(sendData);
-        // this.EGRegisterMessageEvent<PrintResponse>((e,sender,protocol)=>{
-        //     Print(sender);
-        // });
-        // this.EGOnMessage<PrintResponse>();
-        // this.EGReadFromFile("SaveData/MySeg2.seg2");
-        //TestTCPClient();
-        //TestSerialPort();
-        //TestTCPServer();
-        //this.EGUDP();
-        //this.EGUDPListen(11000);
-        //this.EGSendMessage(new MessageStruct(1,"xxx"),"192.168.1.192:9002",ProtocolType.UDP);
-        //this.EGHttpClient();
-        //this.EGHttpServer().Listen("http://+:6555/index/");
-    }
-    public override void _Process(double delta)
-    {
-        //Print(this.EGMqtt().MqttDevices["192.168.1.220"].IsConnected);
-    }
-    public override void _ExitTree()
+namespace EGFramework.Examples{
+    public partial class EGTest : Node,IEGFramework
     {
+        public Label label { set; get; }
 
-    }
+        public override void _Ready()
+        {
+            this.EGEnabledProtocolTools();
+            
+            this.EGMqtt().ConnectMQTTServer("192.168.1.220");
+            
+            //this.EGUDP().UDPDevices[5555].Connect(IPAddress.Parse("224.0.0.251"),5353);
+            //byte[] sendData = { 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x09, 0x5F, 0x73, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x73, 0x07, 0x5F, 0x64, 0x6E, 0x73, 0x2D, 0x73, 0x64, 0x04, 0x5F, 0x75, 0x64, 0x70, 0x05, 0x6C, 0x6F, 0x63, 0x61, 0x6C, 0x00, 0x00, 0x0C, 0x00, 0x01 };
+            //this.EGUDP().UDPDevices[5555].Send(sendData);
+            // this.EGRegisterMessageEvent<PrintResponse>((e,sender,protocol)=>{
+            //     Print(sender);
+            // });
+            // this.EGOnMessage<PrintResponse>();
+            // this.EGReadFromFile("SaveData/MySeg2.seg2");
+            //TestTCPClient();
+            //TestSerialPort();
+            //TestTCPServer();
+            //this.EGUDP();
+            //this.EGUDPListen(11000);
+            //this.EGSendMessage(new MessageStruct(1,"xxx"),"192.168.1.192:9002",ProtocolType.UDP);
+            //this.EGHttpClient();
+            //this.EGHttpServer().Listen("http://+:6555/index/");
+        }
+        public override void _Process(double delta)
+        {
+            //Print(this.EGMqtt().MqttDevices["192.168.1.220"].IsConnected);
+        }
+        public override void _ExitTree()
+        {
 
-    public void OnButton1Click(){
-        this.EGMqtt().SubScribeTheme("192.168.1.220","test");
-        byte[] testData = {0x3A,0x55};
-        this.EGMqtt().PublishTheme("192.168.1.220","test",testData);
-    }
-    
-    public void RefreshMsg(bool coil){
-        label.Text += coil+" ";
-    }
-    public void OnTimer(){
-        //this.EGSendMessage(new MessageStruct(1,"山东博裕1"),"COM4",ProtocolType.SerialPort);
-        //this.EGSendMessage(new MessageStruct(1,"山东博裕1"),"192.168.1.244:6060",ProtocolType.TCPClient);
-        //this.EGSendMessage(new ModbusTCP_WriteMultiCoil(1,0,sendData),"192.168.1.200:3000",ProtocolType.TCPClient);
-        //TestSingleCoil();
-        //TestMultiCoil();
-        //TestSingleHoldingRegister();
-        //TestMultiHoldingRegister();
-    }
-    public void TestModbus(){
-        label = this.GetNode<Label>("Label");
-        label.Text = "[Modbus]";
-        this.EGRegisterMessageEvent<MessageResponse>((e,sender,type)=>{
-            Print("[Got Response]"+"[sender = "+sender+"]"+"["+type+"]"+ e.MessageId+"||"+e.Author);
-        });
-        this.EGOnMessage<MessageResponse>();
-        this.EGRegisterMessageEvent<ModbusTCP_Response>((e,sender,type)=>{
-            if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadCoil){
-                int registerId = 0;
-                foreach(bool coil in e.Coil){
-                    Print(registerId + "Status：" + coil);
-                    registerId++;
+        }
+
+        public void OnButton1Click(){
+            this.EGMqtt().SubScribeTheme("192.168.1.220","test");
+            byte[] testData = {0x3A,0x55};
+            this.EGMqtt().PublishTheme("192.168.1.220","test",testData);
+        }
+        
+        public void RefreshMsg(bool coil){
+            label.Text += coil+" ";
+        }
+        public void OnTimer(){
+            //this.EGSendMessage(new MessageStruct(1,"山东博裕1"),"COM4",ProtocolType.SerialPort);
+            //this.EGSendMessage(new MessageStruct(1,"山东博裕1"),"192.168.1.244:6060",ProtocolType.TCPClient);
+            //this.EGSendMessage(new ModbusTCP_WriteMultiCoil(1,0,sendData),"192.168.1.200:3000",ProtocolType.TCPClient);
+            //TestSingleCoil();
+            //TestMultiCoil();
+            //TestSingleHoldingRegister();
+            //TestMultiHoldingRegister();
+        }
+        public void TestModbus(){
+            label = this.GetNode<Label>("Label");
+            label.Text = "[Modbus]";
+            this.EGRegisterMessageEvent<MessageResponse>((e,sender,type)=>{
+                Print("[Got Response]"+"[sender = "+sender+"]"+"["+type+"]"+ e.MessageId+"||"+e.Author);
+            });
+            this.EGOnMessage<MessageResponse>();
+            this.EGRegisterMessageEvent<ModbusTCP_Response>((e,sender,type)=>{
+                if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadCoil){
+                    int registerId = 0;
+                    foreach(bool coil in e.Coil){
+                        Print(registerId + "Status：" + coil);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadDiscreteInput){
-                int registerId = 0;
-                foreach(bool discreteInput in e.DiscreteInput){
-                    Print(registerId + "Status：" + discreteInput);
-                    registerId++;
+                if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadDiscreteInput){
+                    int registerId = 0;
+                    foreach(bool discreteInput in e.DiscreteInput){
+                        Print(registerId + "Status：" + discreteInput);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadHoldingRegisters){
-                int registerId = 0;
-                foreach(ushort holdingRegister in e.HoldingRegister){
-                    Print(registerId + "Status：" + holdingRegister);
-                    registerId++;
+                if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadHoldingRegisters){
+                    int registerId = 0;
+                    foreach(ushort holdingRegister in e.HoldingRegister){
+                        Print(registerId + "Status：" + holdingRegister);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadInputRegisters){
-                int registerId = 0;
-                foreach(ushort inputRegister in e.InputRegister){
-                    Print(registerId + "Status：" + inputRegister);
-                    label.Text+=registerId + "Status：" + inputRegister;
-                    registerId++;
+                if(type == ProtocolType.TCPClient && e.FunctionType == ModbusFunctionType.ReadInputRegisters){
+                    int registerId = 0;
+                    foreach(ushort inputRegister in e.InputRegister){
+                        Print(registerId + "Status：" + inputRegister);
+                        label.Text+=registerId + "Status：" + inputRegister;
+                        registerId++;
+                    }
                 }
-            }
-            //this.EGOffMessage<ModbusTCP_Response>();
-        });
+                //this.EGOffMessage<ModbusTCP_Response>();
+            });
 
-        this.EGRegisterMessageEvent<ModbusRTU_Response>((e,sender,type)=>{
-            if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadCoil){
-                int registerId = 0;
-                foreach(bool coil in e.Coil){
-                    Print(registerId + "Status：" + coil);
-                    registerId++;
+            this.EGRegisterMessageEvent<ModbusRTU_Response>((e,sender,type)=>{
+                if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadCoil){
+                    int registerId = 0;
+                    foreach(bool coil in e.Coil){
+                        Print(registerId + "Status：" + coil);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadDiscreteInput){
-                int registerId = 0;
-                foreach(bool discreteInput in e.DiscreteInput){
-                    Print(registerId + "Status：" + discreteInput);
-                    registerId++;
+                if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadDiscreteInput){
+                    int registerId = 0;
+                    foreach(bool discreteInput in e.DiscreteInput){
+                        Print(registerId + "Status：" + discreteInput);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadHoldingRegisters){
-                int registerId = 0;
-                foreach(ushort holdingRegister in e.HoldingRegister){
-                    Print(registerId + "Status：" + holdingRegister);
-                    registerId++;
+                if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadHoldingRegisters){
+                    int registerId = 0;
+                    foreach(ushort holdingRegister in e.HoldingRegister){
+                        Print(registerId + "Status：" + holdingRegister);
+                        registerId++;
+                    }
                 }
-            }
-            if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadInputRegisters){
-                int registerId = 0;
-                foreach(ushort inputRegister in e.InputRegister){
-                    Print(registerId + "Status：" + inputRegister);
-                    label.Text+=registerId + "Status：" + inputRegister;
-                    registerId++;
+                if(type == ProtocolType.SerialPort && e.FunctionType == ModbusFunctionType.ReadInputRegisters){
+                    int registerId = 0;
+                    foreach(ushort inputRegister in e.InputRegister){
+                        Print(registerId + "Status：" + inputRegister);
+                        label.Text+=registerId + "Status：" + inputRegister;
+                        registerId++;
+                    }
                 }
-            }
-            //this.EGOffMessage<ModbusRTU_Response>();
-        });
-        
-    }
+                //this.EGOffMessage<ModbusRTU_Response>();
+            });
+            
+        }
 
-    public void TestTCPServer(){
-        this.EGTCPServer().OnClientConnect.Register(e=>{
-            Print(e +" is connected");
-            this.EGSendMessage(new MessageStruct(1,"Hello"),e,ProtocolType.TCPServer);
-        });
-        this.EGTCPServer().OnClientDisconnect.Register(e=>{
-            Print(e +" is disconnect");
-        });
-        this.EGTCPServerListen(9999);
-    }
+        public void TestTCPServer(){
+            this.EGTCPServer().OnClientConnect.Register(e=>{
+                Print(e +" is connected");
+                this.EGSendMessage(new MessageStruct(1,"Hello"),e,ProtocolType.TCPServer);
+            });
+            this.EGTCPServer().OnClientDisconnect.Register(e=>{
+                Print(e +" is disconnect");
+            });
+            this.EGTCPServerListen(9999);
+        }
 
-    public void TestSqlite(){
-        this.EGSqlite().SaveData(new TestBoxMessage());
-        List<TestBoxMessage> result = this.EGSqlite().GetDataSet<TestBoxMessage>();
-        if(result == null){
-            PrintErr(this.EGSqlite().ExceptionMsg);
+        public void TestSqlite(){
+            this.EGSqlite().SaveData(new TestBoxMessage());
+            List<TestBoxMessage> result = this.EGSqlite().GetDataSet<TestBoxMessage>();
+            if(result == null){
+                PrintErr(this.EGSqlite().ExceptionMsg);
+            }
+            Print("Result = " + result[0].TestDouble + result[0].TestFloat);
+        }
+        public void TestSerialPort(){
+            this.EGSerialPort().SetBaudRate(9600);
+            this.EGSendMessage(new ModbusRTU_ReadInputRegisters(1,0,2),"COM4",ProtocolType.SerialPort);
+            this.EGSendMessage(new ModbusRTU_ReadCoils(1,0,8),"COM4",ProtocolType.SerialPort);
+            this.EGOnMessage<ModbusRTU_Response>();
         }
-        Print("Result = " + result[0].TestDouble + result[0].TestFloat);
-    }
-    public void TestSerialPort(){
-        this.EGSerialPort().SetBaudRate(9600);
-        this.EGSendMessage(new ModbusRTU_ReadInputRegisters(1,0,2),"COM4",ProtocolType.SerialPort);
-        this.EGSendMessage(new ModbusRTU_ReadCoils(1,0,8),"COM4",ProtocolType.SerialPort);
-        this.EGOnMessage<ModbusRTU_Response>();
-    }
 
-    public void TestTCPClient(){
-        this.EGTCPClient();
-        this.EGSendMessage(new ModbusTCP_ReadDiscreteInput(1,0,8),"192.168.1.196:6000",ProtocolType.TCPClient);
-        this.EGSendMessage(new ModbusTCP_ReadInputRegisters(1,0,2),"192.168.1.196:6000",ProtocolType.TCPClient);
-        this.EGOnMessage<ModbusTCP_Response>();
-    }
+        public void TestTCPClient(){
+            this.EGTCPClient();
+            this.EGSendMessage(new ModbusTCP_ReadDiscreteInput(1,0,8),"192.168.1.196:6000",ProtocolType.TCPClient);
+            this.EGSendMessage(new ModbusTCP_ReadInputRegisters(1,0,2),"192.168.1.196:6000",ProtocolType.TCPClient);
+            this.EGOnMessage<ModbusTCP_Response>();
+        }
 
-    private bool IsOpen = false;
-    public void TestSingleCoil(){
-        if(IsOpen){
-            //this.EGSendMessage(new ModbusRTU_WriteSingleCoil(1,0,false),"COM4",ProtocolType.SerialPort);
-            this.EGSendMessage(new ModbusTCP_WriteSingleCoil(1,0,false),"192.168.1.196:6000",ProtocolType.TCPClient);
-            IsOpen = false;
-        }else{
-            //this.EGSendMessage(new ModbusRTU_WriteSingleCoil(1,0,true),"COM4",ProtocolType.SerialPort);
-            this.EGSendMessage(new ModbusTCP_WriteSingleCoil(1,0,true),"192.168.1.196:6000",ProtocolType.TCPClient);
-            IsOpen = true;
+        private bool IsOpen = false;
+        public void TestSingleCoil(){
+            if(IsOpen){
+                //this.EGSendMessage(new ModbusRTU_WriteSingleCoil(1,0,false),"COM4",ProtocolType.SerialPort);
+                this.EGSendMessage(new ModbusTCP_WriteSingleCoil(1,0,false),"192.168.1.196:6000",ProtocolType.TCPClient);
+                IsOpen = false;
+            }else{
+                //this.EGSendMessage(new ModbusRTU_WriteSingleCoil(1,0,true),"COM4",ProtocolType.SerialPort);
+                this.EGSendMessage(new ModbusTCP_WriteSingleCoil(1,0,true),"192.168.1.196:6000",ProtocolType.TCPClient);
+                IsOpen = true;
+            }
         }
-    }
-    public void TestMultiCoil(){
-        byte[] OpenCode = {0xFF};
-        byte[] CloseCode = {0x00};
-        if(IsOpen){
-            this.EGSendMessage(new ModbusRTU_WriteMultiCoil(1,0,CloseCode.ToBoolArray()),"COM4",ProtocolType.SerialPort);
-            IsOpen = false;
-        }else{
-            this.EGSendMessage(new ModbusRTU_WriteMultiCoil(1,0,OpenCode.ToBoolArray()),"COM4",ProtocolType.SerialPort);
-            IsOpen = true;
+        public void TestMultiCoil(){
+            byte[] OpenCode = {0xFF};
+            byte[] CloseCode = {0x00};
+            if(IsOpen){
+                this.EGSendMessage(new ModbusRTU_WriteMultiCoil(1,0,CloseCode.ToBoolArray()),"COM4",ProtocolType.SerialPort);
+                IsOpen = false;
+            }else{
+                this.EGSendMessage(new ModbusRTU_WriteMultiCoil(1,0,OpenCode.ToBoolArray()),"COM4",ProtocolType.SerialPort);
+                IsOpen = true;
+            }
         }
-    }
-    public void TestSingleHoldingRegister(){
-        if(IsOpen){
-            this.EGSendMessage(new ModbusRTU_WriteSingleHoldingRegister(1,0,0x00),"COM4",ProtocolType.SerialPort);
-            IsOpen = false;
-        }else{
-            this.EGSendMessage(new ModbusRTU_WriteSingleHoldingRegister(1,0,0x01),"COM4",ProtocolType.SerialPort);
-            IsOpen = true;
+        public void TestSingleHoldingRegister(){
+            if(IsOpen){
+                this.EGSendMessage(new ModbusRTU_WriteSingleHoldingRegister(1,0,0x00),"COM4",ProtocolType.SerialPort);
+                IsOpen = false;
+            }else{
+                this.EGSendMessage(new ModbusRTU_WriteSingleHoldingRegister(1,0,0x01),"COM4",ProtocolType.SerialPort);
+                IsOpen = true;
+            }
         }
-    }
-    public void TestMultiHoldingRegister(){
-        ushort[] OpenCode = {1,1,1,1,1,1,1,1};
-        ushort[] CloseCode = {0,0,0,0,0,0,0,0};
-        if(IsOpen){
-            this.EGSendMessage(new ModbusRTU_WriteMultiHoldingRegister(1,0,CloseCode),"COM4",ProtocolType.SerialPort);
-            IsOpen = false;
-        }else{
-            this.EGSendMessage(new ModbusRTU_WriteMultiHoldingRegister(1,0,OpenCode),"COM4",ProtocolType.SerialPort);
-            IsOpen = true;
+        public void TestMultiHoldingRegister(){
+            ushort[] OpenCode = {1,1,1,1,1,1,1,1};
+            ushort[] CloseCode = {0,0,0,0,0,0,0,0};
+            if(IsOpen){
+                this.EGSendMessage(new ModbusRTU_WriteMultiHoldingRegister(1,0,CloseCode),"COM4",ProtocolType.SerialPort);
+                IsOpen = false;
+            }else{
+                this.EGSendMessage(new ModbusRTU_WriteMultiHoldingRegister(1,0,OpenCode),"COM4",ProtocolType.SerialPort);
+                IsOpen = true;
+            }
         }
-    }
 
-}
-public class TestBoxMessage {
-    public int Code = 0;
-    public float TestFloat = 0.1f;
-    public double TestDouble;
-    public bool IsHaveMessage;
-    public string MessageInfo;
-    public MessageType MsgType;
-    public MessageStruct MsgStruct;
-    public MessagePair MsgPair;
-    public TestBoxMessage(){
-        this.Code = 1;
-        this.TestFloat = 1.2f;
-        this.TestDouble = 2.52;
-        this.IsHaveMessage = true;
-        this.MessageInfo = "DefaultInfo";
-        MsgType = MessageType.TypeInt;
-        MsgPair = new MessagePair();
-        MsgStruct = new MessageStruct(5,"Ad");
     }
-    public string ToProtocolData()
-    {
-        return JsonConvert.SerializeObject(this);
-    }
-}
-public class MessagePair{
-    public int MessageId;
-    public string Author;
-    public string MessageInfo;
-    public int TimeStamp;
-    public MessagePair(){
-        this.MessageId = 10001;
-        this.Author = "Admin";
-        this.MessageInfo = "Hello every one!";
-        this.TimeStamp = 1690188342;
-    }
-}
-public struct MessageStruct : IRequest,IEGFramework{
-    public string FunctionCode;
-    public int MessageId;
-    public string Author;
-    public MessageStruct(int messageId,string author){
-        FunctionCode = "Message";
-        MessageId = messageId;
-        Author = author;
+    public class TestBoxMessage {
+        public int Code = 0;
+        public float TestFloat = 0.1f;
+        public double TestDouble;
+        public bool IsHaveMessage;
+        public string MessageInfo;
+        public MessageType MsgType;
+        public MessageStruct MsgStruct;
+        public MessagePair MsgPair;
+        public TestBoxMessage(){
+            this.Code = 1;
+            this.TestFloat = 1.2f;
+            this.TestDouble = 2.52;
+            this.IsHaveMessage = true;
+            this.MessageInfo = "DefaultInfo";
+            MsgType = MessageType.TypeInt;
+            MsgPair = new MessagePair();
+            MsgStruct = new MessageStruct(5,"Ad");
+        }
+        public string ToProtocolData()
+        {
+            return JsonConvert.SerializeObject(this);
+        }
     }
-    public byte[] ToProtocolByteData()
-    {
-        return JsonConvert.SerializeObject(this).ToBytesByEncoding("GBK");
+    public class MessagePair{
+        public int MessageId;
+        public string Author;
+        public string MessageInfo;
+        public int TimeStamp;
+        public MessagePair(){
+            this.MessageId = 10001;
+            this.Author = "Admin";
+            this.MessageInfo = "Hello every one!";
+            this.TimeStamp = 1690188342;
+        }
     }
-    public string ToProtocolData()
-    {
-        return "";
-        //return JsonConvert.SerializeObject(this);
+    public struct MessageStruct : IRequest,IEGFramework{
+        public string FunctionCode;
+        public int MessageId;
+        public string Author;
+        public MessageStruct(int messageId,string author){
+            FunctionCode = "Message";
+            MessageId = messageId;
+            Author = author;
+        }
+        public byte[] ToProtocolByteData()
+        {
+            return JsonConvert.SerializeObject(this).ToBytesByEncoding("GBK");
+        }
+        public string ToProtocolData()
+        {
+            return "";
+            //return JsonConvert.SerializeObject(this);
+        }
     }
-}
-public struct MessageResponse : IResponse
-{
-    public string FunctionCode { set; get; }
-    public int MessageId;
-    public string Author;
-    public bool TrySetData(string protocolData, byte[] protocolBytes)
+    public struct MessageResponse : IResponse
     {
-        try
+        public string FunctionCode { set; get; }
+        public int MessageId;
+        public string Author;
+        public bool TrySetData(string protocolData, byte[] protocolBytes)
         {
-            //GD.Print(protocolData);
-            MessageResponse res = JsonConvert.DeserializeObject<MessageResponse>(protocolData);
-            if(res.FunctionCode == "Message"){
-                this.FunctionCode = res.FunctionCode;
-                this.MessageId = res.MessageId;
-                this.Author = res.Author;
-                return true;
+            try
+            {
+                //GD.Print(protocolData);
+                MessageResponse res = JsonConvert.DeserializeObject<MessageResponse>(protocolData);
+                if(res.FunctionCode == "Message"){
+                    this.FunctionCode = res.FunctionCode;
+                    this.MessageId = res.MessageId;
+                    this.Author = res.Author;
+                    return true;
+                }
+                return false;
+            }
+            catch (Exception)
+            {
+                return false;
             }
-            return false;
-        }
-        catch (Exception)
-        {
-            return false;
         }
     }
-}
 
-public struct PrintResponse : IResponse
-{
-    public bool TrySetData(string protocolData, byte[] protocolBytes)
+    public struct PrintResponse : IResponse
     {
-        //Print("Received String is " + protocolData);
-        Print("Received bytes is " + protocolBytes.ToStringByHex());
-        return true;
-    }
+        public bool TrySetData(string protocolData, byte[] protocolBytes)
+        {
+            //Print("Received String is " + protocolData);
+            Print("Received bytes is " + protocolBytes.ToStringByHex());
+            return true;
+        }
 
-}
+    }
 
-public enum MessageType{
-    TypeString = 1,
-    TypeInt = 2,
-    TypeObject = 3,
-    TypeArray = 4
+    public enum MessageType{
+        TypeString = 1,
+        TypeInt = 2,
+        TypeObject = 3,
+        TypeArray = 4
+    }
 }
\ No newline at end of file
diff --git a/addons/EGFramework/Module/EGMessage.cs b/addons/EGFramework/Module/EGMessage.cs
index 3d89395..25e8f49 100644
--- a/addons/EGFramework/Module/EGMessage.cs
+++ b/addons/EGFramework/Module/EGMessage.cs
@@ -20,12 +20,12 @@ namespace EGFramework
         /// <value></value>
         public int SendDelay { set; get; } = 100;
         public Queue<RequestMsgEvent> RequestCache { set; get; } = new Queue<RequestMsgEvent>();
-        private Timer RequestTimer { set; get; }
+        private System.Timers.Timer RequestTimer { set; get; }
 
         public override void Init()
         {
             if(SendDelay>0){
-                RequestTimer = new Timer(SendDelay);
+                RequestTimer = new System.Timers.Timer(SendDelay);
                 RequestTimer.Elapsed += ExecuteRequest;
                 RequestTimer.AutoReset = true;
                 RequestTimer.Enabled = true;
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BACnetClient.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BACnetClient.cs
new file mode 100644
index 0000000..4d9a4de
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BACnetClient.cs
@@ -0,0 +1,2937 @@
+/**************************************************************************
+*                           MIT License
+* 
+* Copyright (C) 2014 Morten Kvistgaard <mk@pch-engineering.dk>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+using System.Collections.Concurrent;
+using EGFramework;
+using Godot;
+
+namespace System.IO.BACnet;
+
+public delegate void MessageRecievedHandler(IBacnetTransport sender, byte[] buffer, int offset, int msgLength, BacnetAddress remoteAddress);
+
+/// <summary>
+/// BACnet network client or server
+/// </summary>
+public class BacnetClient : IDisposable
+{
+    private int _retries;
+    private int _invokeId;
+
+    private readonly LastSegmentAck _lastSegmentAck = new();
+    private uint _writepriority;
+
+    /// <summary>
+    /// Dictionary of List of Tuples with sequence-number and byte[] per invoke-id
+    /// TODO: invoke-id should be PER (remote) DEVICE!
+    /// </summary>
+    private Dictionary<byte, List<Tuple<byte, byte[]>>> _segmentsPerInvokeId = new();
+    private ConcurrentDictionary<byte, object> _locksPerInvokeId = new();
+    private Dictionary<byte, byte> _expectedSegmentsPerInvokeId = new();
+
+    public const int DEFAULT_UDP_PORT = 0xBAC0;
+    public const int DEFAULT_TIMEOUT = 1000;
+    public const int DEFAULT_RETRIES = 3;
+
+    public IBacnetTransport Transport { get; }
+    public ushort VendorId { get; set; } = 260;
+    public int Timeout { get; set; }
+    public int TransmitTimeout { get; set; } = 30000;
+    public BacnetMaxSegments MaxSegments { get; set; } = BacnetMaxSegments.MAX_SEG0;
+    public byte ProposedWindowSize { get; set; } = 10;
+    public bool ForceWindowSize { get; set; }
+    public bool DefaultSegmentationHandling { get; set; } = true;
+    public ILog Log { get; set; } = LogManager.GetLogger<BacnetClient>();
+
+    /// <summary>
+    /// Used as the number of tentatives
+    /// </summary>
+    public int Retries
+    {
+        get => _retries;
+        set => _retries = Math.Max(1, value);
+    }
+
+    public uint WritePriority
+    {
+        get => _writepriority;
+        set { if (value < 17) _writepriority = value; }
+    }
+
+    // These members allows to access undecoded buffer by the application
+    // layer, when the basic undecoding process is not really able to do the job
+    // in particular with application_specific_encoding values
+    public byte[] raw_buffer;
+    public int raw_offset, raw_length;
+
+    public class Segmentation
+    {
+        // ReSharper disable InconsistentNaming
+        // was public before refactor so can't change this
+        public EncodeBuffer buffer;
+        public byte sequence_number;
+        public byte window_size;
+        public byte max_segments;
+        // ReSharper restore InconsistentNaming
+    }
+
+    private class LastSegmentAck
+    {
+        private readonly ManualResetEvent _wait = new(false);
+        private readonly object _lockObject = new();
+        private BacnetAddress _address;
+        private byte _invokeId;
+
+        public byte SequenceNumber;
+        public byte WindowSize;
+
+        public void Set(BacnetAddress adr, byte invokeId, byte sequenceNumber, byte windowSize)
+        {
+            lock (_lockObject)
+            {
+                _address = adr;
+                _invokeId = invokeId;
+                SequenceNumber = sequenceNumber;
+                WindowSize = windowSize;
+                _wait.Set();
+            }
+        }
+
+        public bool Wait(BacnetAddress adr, byte invokeId, int timeout)
+        {
+            Monitor.Enter(_lockObject);
+            while (!adr.Equals(this._address) || this._invokeId != invokeId)
+            {
+                _wait.Reset();
+                Monitor.Exit(_lockObject);
+                if (!_wait.WaitOne(timeout)) return false;
+                Monitor.Enter(_lockObject);
+            }
+            Monitor.Exit(_lockObject);
+            _address = null;
+            return true;
+        }
+    }
+
+    public BacnetClient(int port = DEFAULT_UDP_PORT, int timeout = DEFAULT_TIMEOUT, int retries = DEFAULT_RETRIES)
+        : this(new BacnetIpUdpProtocolTransport(port), timeout, retries)
+    {
+    }
+
+    public BacnetClient(IBacnetTransport transport, int timeout = DEFAULT_TIMEOUT, int retries = DEFAULT_RETRIES)
+    {
+        Transport = transport;
+        Timeout = timeout;
+        Retries = retries;
+    }
+
+    public override bool Equals(object obj)
+    {
+        return Transport.Equals((obj as BacnetClient)?.Transport);
+    }
+
+    public override int GetHashCode()
+    {
+        return Transport.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return Transport.ToString();
+    }
+
+    public EncodeBuffer GetEncodeBuffer(int startOffset)
+    {
+        return new EncodeBuffer(new byte[Transport.MaxBufferLength], startOffset);
+    }
+
+    public void Start()
+    {
+        Transport.Start();
+        Transport.MessageRecieved += OnRecieve;
+        Log.Info("Started communication");
+    }
+
+    public delegate void ConfirmedServiceRequestHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, byte invokeId, byte[] buffer, int offset, int length);
+    public event ConfirmedServiceRequestHandler OnConfirmedServiceRequest;
+    public delegate void ReadPropertyRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, BacnetPropertyReference property, BacnetMaxSegments maxSegments);
+    public event ReadPropertyRequestHandler OnReadPropertyRequest;
+    public delegate void ReadPropertyMultipleRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, IList<BacnetReadAccessSpecification> properties, BacnetMaxSegments maxSegments);
+    public event ReadPropertyMultipleRequestHandler OnReadPropertyMultipleRequest;
+    public delegate void WritePropertyRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, BacnetPropertyValue value, BacnetMaxSegments maxSegments);
+    public event WritePropertyRequestHandler OnWritePropertyRequest;
+    public delegate void WritePropertyMultipleRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, ICollection<BacnetPropertyValue> values, BacnetMaxSegments maxSegments);
+    public event WritePropertyMultipleRequestHandler OnWritePropertyMultipleRequest;
+    public delegate void AtomicWriteFileRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, bool isStream, BacnetObjectId objectId, int position, uint blockCount, byte[][] blocks, int[] counts, BacnetMaxSegments maxSegments);
+    public event AtomicWriteFileRequestHandler OnAtomicWriteFileRequest;
+    public delegate void AtomicReadFileRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, bool isStream, BacnetObjectId objectId, int position, uint count, BacnetMaxSegments maxSegments);
+    public event AtomicReadFileRequestHandler OnAtomicReadFileRequest;
+    public delegate void SubscribeCOVRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, uint subscriberProcessIdentifier, BacnetObjectId monitoredObjectIdentifier, bool cancellationRequest, bool issueConfirmedNotifications, uint lifetime, BacnetMaxSegments maxSegments);
+    public event SubscribeCOVRequestHandler OnSubscribeCOV;
+    public delegate void EventNotificationCallbackHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetEventNotificationData eventData, bool needConfirm);
+    public event EventNotificationCallbackHandler OnEventNotify;
+    public delegate void SubscribeCOVPropertyRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, uint subscriberProcessIdentifier, BacnetObjectId monitoredObjectIdentifier, BacnetPropertyReference monitoredProperty, bool cancellationRequest, bool issueConfirmedNotifications, uint lifetime, float covIncrement, BacnetMaxSegments maxSegments);
+    public event SubscribeCOVPropertyRequestHandler OnSubscribeCOVProperty;
+    public delegate void DeviceCommunicationControlRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, uint timeDuration, uint enableDisable, string password, BacnetMaxSegments maxSegments);
+    public event DeviceCommunicationControlRequestHandler OnDeviceCommunicationControl;
+    public delegate void ReinitializedRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetReinitializedStates state, string password, BacnetMaxSegments maxSegments);
+    public event ReinitializedRequestHandler OnReinitializedDevice;
+    public delegate void ReadRangeHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, BacnetPropertyReference property, BacnetReadRangeRequestTypes requestType, uint position, DateTime time, int count, BacnetMaxSegments maxSegments);
+    public event ReadRangeHandler OnReadRange;
+    public delegate void CreateObjectRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, ICollection<BacnetPropertyValue> values, BacnetMaxSegments maxSegments);
+    public event CreateObjectRequestHandler OnCreateObjectRequest;
+    public delegate void DeleteObjectRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, BacnetObjectId objectId, BacnetMaxSegments maxSegments);
+    public event DeleteObjectRequestHandler OnDeleteObjectRequest;
+    public delegate void GetAlarmSummaryOrEventInformationRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, bool getEvent, BacnetObjectId objectId, BacnetMaxAdpu maxApdu, BacnetMaxSegments max_segments);
+    public event GetAlarmSummaryOrEventInformationRequestHandler OnGetAlarmSummaryOrEventInformation;
+    public delegate void AlarmAcknowledgeRequestHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, uint ackProcessIdentifier, BacnetObjectId eventObjectIdentifier, uint eventStateAcked, string ackSource, BacnetGenericTime eventTimeStamp, BacnetGenericTime ackTimeStamp);
+    public event AlarmAcknowledgeRequestHandler OnAlarmAcknowledge;
+
+    protected void ProcessConfirmedServiceRequest(BacnetAddress address, BacnetPduTypes type, BacnetConfirmedServices service, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, byte invokeId, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug($"ConfirmedServiceRequest {service}");
+
+            raw_buffer = buffer;
+            raw_length = length;
+            raw_offset = offset;
+
+            OnConfirmedServiceRequest?.Invoke(this, address, type, service, maxSegments, maxAdpu, invokeId, buffer, offset, length);
+
+            //don't send segmented messages, if client don't want it
+            if ((type & BacnetPduTypes.SEGMENTED_RESPONSE_ACCEPTED) == 0)
+                maxSegments = BacnetMaxSegments.MAX_SEG0;
+
+            if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROPERTY && OnReadPropertyRequest != null)
+            {
+                int thsRejectReason;
+
+                if ((thsRejectReason = Services.DecodeReadProperty(buffer, offset, length, out var objectId, out var property)) >= 0)
+                {
+                    OnReadPropertyRequest(this, address, invokeId, objectId, property, maxSegments);
+                }
+                else
+                {
+                    switch (thsRejectReason)
+                    {
+                        case -1:
+                            SendConfirmedServiceReject(address, invokeId, BacnetRejectReason.MISSING_REQUIRED_PARAMETER);
+                            break;
+                        case -2:
+                            SendConfirmedServiceReject(address, invokeId, BacnetRejectReason.INVALID_TAG);
+                            break;
+                        case -3:
+                            SendConfirmedServiceReject(address, invokeId, BacnetRejectReason.TOO_MANY_ARGUMENTS);
+                            break;
+                    }
+                    Log.Warn("Couldn't decode DecodeReadProperty");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_WRITE_PROPERTY && OnWritePropertyRequest != null)
+            {
+                if (Services.DecodeWriteProperty(address, buffer, offset, length, out var objectId, out var value) >= 0)
+                    OnWritePropertyRequest(this, address, invokeId, objectId, value, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    //SendConfirmedServiceReject(adr, invokeId, BacnetRejectReason.OTHER); 
+                    Log.Warn("Couldn't decode DecodeWriteProperty");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROP_MULTIPLE && OnReadPropertyMultipleRequest != null)
+            {
+                if (Services.DecodeReadPropertyMultiple(buffer, offset, length, out var properties) >= 0)
+                    OnReadPropertyMultipleRequest(this, address, invokeId, properties, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode DecodeReadPropertyMultiple");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE && OnWritePropertyMultipleRequest != null)
+            {
+                if (Services.DecodeWritePropertyMultiple(address, buffer, offset, length, out var objectId, out var values) >= 0)
+                    OnWritePropertyMultipleRequest(this, address, invokeId, objectId, values, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode DecodeWritePropertyMultiple");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_COV_NOTIFICATION && OnCOVNotification != null)
+            {
+                if (Services.DecodeCOVNotifyUnconfirmed(address, buffer, offset, length, out var subscriberProcessIdentifier, out var initiatingDeviceIdentifier, out var monitoredObjectIdentifier, out var timeRemaining, out var values) >= 0)
+                    OnCOVNotification(this, address, invokeId, subscriberProcessIdentifier, initiatingDeviceIdentifier, monitoredObjectIdentifier, timeRemaining, true, values, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode COVNotify");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_WRITE_FILE && OnAtomicWriteFileRequest != null)
+            {
+                if (Services.DecodeAtomicWriteFile(buffer, offset, length, out var isStream, out var objectId, out var position, out var blockCount, out var blocks, out var counts) >= 0)
+                    OnAtomicWriteFileRequest(this, address, invokeId, isStream, objectId, position, blockCount, blocks, counts, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode AtomicWriteFile");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_READ_FILE && OnAtomicReadFileRequest != null)
+            {
+                if (Services.DecodeAtomicReadFile(buffer, offset, length, out var isStream, out var objectId, out var position, out var count) >= 0)
+                    OnAtomicReadFileRequest(this, address, invokeId, isStream, objectId, position, count, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode AtomicReadFile");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_SUBSCRIBE_COV && OnSubscribeCOV != null)
+            {
+                if (Services.DecodeSubscribeCOV(buffer, offset, length, out var subscriberProcessIdentifier, out var monitoredObjectIdentifier, out var cancellationRequest, out var issueConfirmedNotifications, out var lifetime) >= 0)
+                    OnSubscribeCOV(this, address, invokeId, subscriberProcessIdentifier, monitoredObjectIdentifier, cancellationRequest, issueConfirmedNotifications, lifetime, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode SubscribeCOV");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_SUBSCRIBE_COV_PROPERTY && OnSubscribeCOVProperty != null)
+            {
+                if (Services.DecodeSubscribeProperty(buffer, offset, length, out var subscriberProcessIdentifier, out var monitoredObjectIdentifier, out var monitoredProperty, out var cancellationRequest, out var issueConfirmedNotifications, out var lifetime, out var covIncrement) >= 0)
+                    OnSubscribeCOVProperty(this, address, invokeId, subscriberProcessIdentifier, monitoredObjectIdentifier, monitoredProperty, cancellationRequest, issueConfirmedNotifications, lifetime, covIncrement, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode SubscribeCOVProperty");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL && OnDeviceCommunicationControl != null)
+            {
+                // DAL
+                if (Services.DecodeDeviceCommunicationControl(buffer, offset, length, out var timeDuration, out var enableDisable, out var password) >= 0)
+                    OnDeviceCommunicationControl(this, address, invokeId, timeDuration, enableDisable, password, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode DeviceCommunicationControl");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_REINITIALIZE_DEVICE && OnReinitializedDevice != null)
+            {
+                // DAL
+                if (Services.DecodeReinitializeDevice(buffer, offset, length, out var state, out var password) >= 0)
+                    OnReinitializedDevice(this, address, invokeId, state, password, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode ReinitializeDevice");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_EVENT_NOTIFICATION && OnEventNotify != null) // F. Chaxel
+            {
+                if (Services.DecodeEventNotifyData(buffer, offset, length, out var eventData) >= 0)
+                {
+                    OnEventNotify(this, address, invokeId, eventData, true);
+                }
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode confirmed Event/Alarm Notification");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_READ_RANGE && OnReadRange != null)
+            {
+                if (Services.DecodeReadRange(buffer, offset, length, out var objectId, out var property, out var requestType, out var position, out var time, out var count) >= 0)
+                    OnReadRange(this, address, invokeId, objectId, property, requestType, position, time, count, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode ReadRange");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_CREATE_OBJECT && OnCreateObjectRequest != null)
+            {
+                if (Services.DecodeCreateObject(address, buffer, offset, length, out var objectId, out var values) >= 0)
+                    OnCreateObjectRequest(this, address, invokeId, objectId, values, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode CreateObject");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_DELETE_OBJECT && OnDeleteObjectRequest != null)
+            {
+                if (Services.DecodeDeleteObject(buffer, offset, length, out var objectId) >= 0)
+                    OnDeleteObjectRequest(this, address, invokeId, objectId, maxSegments);
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode DecodeDeleteObject");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_GET_ALARM_SUMMARY && OnGetAlarmSummaryOrEventInformation != null)
+            {
+                // DAL -- added the core code required but since I couldn't test it we just reject this service
+                // rejecting it shouldn't be too bad a thing since GetAlarmSummary has been retired anyway...
+                // if someone needs it they can uncomment the related code and test.
+#if false
+                    BacnetObjectId objectId = default(BacnetObjectId);
+                    objectId.Type = BacnetObjectTypes.MAX_BACNET_OBJECT_TYPE;
+                    if (Services.DecodeAlarmSummaryOrEventRequest(buffer, offset, length, false, ref objectId) >= 0)
+                    {
+                        OnGetAlarmSummaryOrEventInformation(this, address, invokeId, false, objectId, maxAdpu, maxSegments);
+                    }
+                    else
+                    {
+                        // DAL
+                        SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                        //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                        Log.Warn("Couldn't decode GetAlarmSummary");
+                    }
+#else
+                SendConfirmedServiceReject(address, invokeId, BacnetRejectReason.RECOGNIZED_SERVICE); // should be unrecognized but this is the way it was spelled..
+#endif
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_GET_EVENT_INFORMATION && OnGetAlarmSummaryOrEventInformation != null)
+            {
+                // DAL
+                BacnetObjectId objectId = default;
+                objectId.Type = BacnetObjectTypes.MAX_BACNET_OBJECT_TYPE;
+                if (Services.DecodeAlarmSummaryOrEventRequest(buffer, offset, length, true, ref objectId) >= 0)
+                {
+                    OnGetAlarmSummaryOrEventInformation(this, address, invokeId, true, objectId, maxAdpu, maxSegments);
+                }
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode GetEventInformation");
+                }
+            }
+            else if (service == BacnetConfirmedServices.SERVICE_CONFIRMED_ACKNOWLEDGE_ALARM && OnAlarmAcknowledge != null)
+            {
+                // DAL
+                if (Services.DecodeAlarmAcknowledge(buffer, offset, length, out uint ackProcessIdentifier, out BacnetObjectId eventObjectIdentifier, out uint eventStateAcked, out string ackSource, out BacnetGenericTime eventTimeStamp, out BacnetGenericTime ackTimeStamp) >= 0)
+                {
+                    OnAlarmAcknowledge(this, address, invokeId, ackProcessIdentifier, eventObjectIdentifier, eventStateAcked, ackSource, eventTimeStamp, ackTimeStamp);
+                }
+                else
+                {
+                    // DAL
+                    SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+                    //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                    Log.Warn("Couldn't decode AlarmAcknowledge");
+                }
+            }
+            else
+            {
+                // DAL
+                SendConfirmedServiceReject(address, invokeId, BacnetRejectReason.RECOGNIZED_SERVICE); // should be unrecognized but this is the way it was spelled..
+                Log.Debug($"Confirmed service not handled: {service}");
+            }
+        }
+        catch (Exception ex)
+        {
+            // DAL
+            SendAbort(address, invokeId, BacnetAbortReason.OTHER);
+            //ErrorResponse(address, service, invokeId, BacnetErrorClasses.ERROR_CLASS_DEVICE, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+            Log.Error("Error in ProcessConfirmedServiceRequest", ex);
+        }
+    }
+
+    public delegate void UnconfirmedServiceRequestHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetUnconfirmedServices service, byte[] buffer, int offset, int length);
+    public event UnconfirmedServiceRequestHandler OnUnconfirmedServiceRequest;
+    public delegate void WhoHasHandler(BacnetClient sender, BacnetAddress adr, int lowLimit, int highLimit, BacnetObjectId? objId, string objName);
+    public event WhoHasHandler OnWhoHas;
+    public delegate void IamHandler(BacnetClient sender, BacnetAddress adr, uint deviceId, uint maxAPDU, BacnetSegmentations segmentation, ushort vendorId);
+    public event IamHandler OnIam;
+    public delegate void WhoIsHandler(BacnetClient sender, BacnetAddress adr, int lowLimit, int highLimit);
+    public event WhoIsHandler OnWhoIs;
+    public delegate void TimeSynchronizeHandler(BacnetClient sender, BacnetAddress adr, DateTime dateTime, bool utc);
+    public event TimeSynchronizeHandler OnTimeSynchronize;
+
+    //used by both 'confirmed' and 'unconfirmed' notify
+    public delegate void COVNotificationHandler(BacnetClient sender, BacnetAddress adr, byte invokeId, uint subscriberProcessIdentifier, BacnetObjectId initiatingDeviceIdentifier, BacnetObjectId monitoredObjectIdentifier, uint timeRemaining, bool needConfirm, ICollection<BacnetPropertyValue> values, BacnetMaxSegments maxSegments);
+    public event COVNotificationHandler OnCOVNotification;
+
+    protected void ProcessUnconfirmedServiceRequest(BacnetAddress address, BacnetPduTypes type, BacnetUnconfirmedServices service, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug("UnconfirmedServiceRequest");
+            OnUnconfirmedServiceRequest?.Invoke(this, address, type, service, buffer, offset, length);
+            if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_I_AM && OnIam != null)
+            {
+                if (Services.DecodeIamBroadcast(buffer, offset, out var deviceId, out var maxAdpu, out var segmentation, out var vendorId) >= 0)
+                    OnIam(this, address, deviceId, maxAdpu, segmentation, vendorId);
+                else
+                    Log.Warn("Couldn't decode IamBroadcast");
+            }
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_WHO_IS && OnWhoIs != null)
+            {
+                if (Services.DecodeWhoIsBroadcast(buffer, offset, length, out var lowLimit, out var highLimit) >= 0)
+                    OnWhoIs(this, address, lowLimit, highLimit);
+                else
+                    Log.Warn("Couldn't decode WhoIsBroadcast");
+            }
+            // added by thamersalek
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_WHO_HAS && OnWhoHas != null)
+            {
+                if (Services.DecodeWhoHasBroadcast(buffer, offset, length, out var lowLimit, out var highLimit, out var objId, out var objName) >= 0)
+                    OnWhoHas(this, address, lowLimit, highLimit, objId, objName);
+                else
+                    Log.Warn("Couldn't decode WhoHasBroadcast");
+            }
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_COV_NOTIFICATION && OnCOVNotification != null)
+            {
+                if (Services.DecodeCOVNotifyUnconfirmed(address, buffer, offset, length, out var subscriberProcessIdentifier, out var initiatingDeviceIdentifier, out var monitoredObjectIdentifier, out var timeRemaining, out var values) >= 0)
+                    OnCOVNotification(this, address, 0, subscriberProcessIdentifier, initiatingDeviceIdentifier, monitoredObjectIdentifier, timeRemaining, false, values, BacnetMaxSegments.MAX_SEG0);
+                else
+                    Log.Warn("Couldn't decode COVNotifyUnconfirmed");
+            }
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_TIME_SYNCHRONIZATION && OnTimeSynchronize != null)
+            {
+                if (Services.DecodeTimeSync(buffer, offset, length, out var dateTime) >= 0)
+                    OnTimeSynchronize(this, address, dateTime, false);
+                else
+                    Log.Warn("Couldn't decode TimeSynchronize");
+            }
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_UTC_TIME_SYNCHRONIZATION && OnTimeSynchronize != null)
+            {
+                if (Services.DecodeTimeSync(buffer, offset, length, out var dateTime) >= 0)
+                    OnTimeSynchronize(this, address, dateTime, true);
+                else
+                    Log.Warn("Couldn't decode TimeSynchronize");
+            }
+            else if (service == BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_EVENT_NOTIFICATION && OnEventNotify != null) // F. Chaxel
+            {
+                if (Services.DecodeEventNotifyData(buffer, offset, length, out var eventData) >= 0)
+                    OnEventNotify(this, address, 0, eventData, false);
+                else
+                    Log.Warn("Couldn't decode unconfirmed Event/Alarm Notification");
+            }
+            else
+            {
+                Log.Debug($"Unconfirmed service not handled: {service}");
+                // SendUnConfirmedServiceReject(adr); ? exists ?
+            }
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in ProcessUnconfirmedServiceRequest", ex);
+        }
+    }
+
+    public delegate void SimpleAckHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] data, int dataOffset, int dataLength);
+    public event SimpleAckHandler OnSimpleAck;
+
+    protected void ProcessSimpleAck(BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug($"Received SimpleAck for {service}");
+            OnSimpleAck?.Invoke(this, adr, type, service, invokeId, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in ProcessSimpleAck", ex);
+        }
+    }
+
+    public delegate void ComplexAckHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] buffer, int offset, int length);
+    public event ComplexAckHandler OnComplexAck;
+
+    protected void ProcessComplexAck(BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug($"Received ComplexAck for {service}");
+            OnComplexAck?.Invoke(this, adr, type, service, invokeId, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error($"Error in {nameof(ProcessComplexAck)}", ex);
+        }
+    }
+
+    public delegate void ErrorHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetErrorClasses errorClass, BacnetErrorCodes errorCode, byte[] buffer, int offset, int length);
+    public event ErrorHandler OnError;
+
+    protected void ProcessError(BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            if (Services.DecodeError(buffer, offset, length, out var errorClass, out var errorCode) < 0)
+                Log.Warn("Couldn't decode received Error");
+
+            Log.Debug($"Received Error {errorClass} {errorCode}");
+            OnError?.Invoke(this, adr, type, service, invokeId, errorClass, errorCode, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error($"Error in {nameof(ProcessError)}", ex);
+        }
+    }
+
+    public delegate void AbortHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetAbortReason reason, byte[] buffer, int offset, int length);
+    public event AbortHandler OnAbort;
+
+    protected void ProcessAbort(BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetAbortReason reason, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug($"Received Abort, reason: {reason}");
+            OnAbort?.Invoke(this, adr, type, invokeId, reason, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in ProcessAbort", ex);
+        }
+    }
+
+    public delegate void RejectHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetRejectReason reason, byte[] buffer, int offset, int length);
+    public event RejectHandler OnReject;
+
+    protected void ProcessReject(BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetRejectReason reason, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug($"Received Reject, reason: {reason}");
+            OnReject?.Invoke(this, adr, type, invokeId, reason, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in ProcessReject", ex);
+        }
+    }
+
+    public delegate void SegmentAckHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, byte originalInvokeId, byte sequenceNumber, byte actualWindowSize, byte[] buffer, int offset, int length);
+    public event SegmentAckHandler OnSegmentAck;
+
+    protected void ProcessSegmentAck(BacnetAddress adr, BacnetPduTypes type, byte originalInvokeId, byte sequenceNumber, byte actualWindowSize, byte[] buffer, int offset, int length)
+    {
+        try
+        {
+            Log.Debug("Received SegmentAck");
+            OnSegmentAck?.Invoke(this, adr, type, originalInvokeId, sequenceNumber, actualWindowSize, buffer, offset, length);
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in ProcessSegmentAck", ex);
+        }
+    }
+
+    public delegate void SegmentHandler(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, byte sequenceNumber, byte[] buffer, int offset, int length);
+    public event SegmentHandler OnSegment;
+
+    private void ProcessSegment(BacnetAddress address, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, bool server, byte sequenceNumber, byte proposedWindowNumber, byte[] buffer, int offset, int length)
+    {
+        lock (_locksPerInvokeId.GetOrAdd(invokeId, () => new object()))
+        {
+            ProcessSegmentLocked(address, type, service, invokeId, maxSegments, maxAdpu, server, sequenceNumber,
+                proposedWindowNumber, buffer, offset, length);
+        }
+    }
+
+    private void ProcessSegmentLocked(BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service,
+        byte invokeId, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, bool server, byte sequenceNumber,
+        byte proposedWindowNumber, byte[] buffer, int offset, int length)
+    {
+        Log.Trace($@"Processing Segment #{sequenceNumber} of invoke-id #{invokeId}");
+
+        if (!_segmentsPerInvokeId.ContainsKey(invokeId))
+            _segmentsPerInvokeId[invokeId] = new List<Tuple<byte, byte[]>>();
+
+        if (!_expectedSegmentsPerInvokeId.ContainsKey(invokeId))
+            _expectedSegmentsPerInvokeId[invokeId] = byte.MaxValue;
+
+        var moreFollows = (type & BacnetPduTypes.MORE_FOLLOWS) == BacnetPduTypes.MORE_FOLLOWS;
+
+        if (!moreFollows)
+            _expectedSegmentsPerInvokeId[invokeId] = (byte)(sequenceNumber + 1);
+
+        //send ACK
+        if (sequenceNumber % proposedWindowNumber == 0 || !moreFollows)
+        {
+            if (ForceWindowSize)
+                proposedWindowNumber = ProposedWindowSize;
+
+            SegmentAckResponse(adr, false, server, invokeId, sequenceNumber, proposedWindowNumber);
+        }
+
+        //Send on
+        OnSegment?.Invoke(this, adr, type, service, invokeId, maxSegments, maxAdpu, sequenceNumber, buffer, offset, length);
+
+        //default segment assembly. We run this seperately from the above handler, to make sure that it comes after!
+        if (DefaultSegmentationHandling)
+            PerformDefaultSegmentHandling(adr, type, service, invokeId, maxSegments, maxAdpu, sequenceNumber, buffer, offset, length);
+    }
+
+    /// <summary>
+    /// This is a simple handling that stores all segments in memory and assembles them when done
+    /// </summary>
+    private void PerformDefaultSegmentHandling(BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, byte sequenceNumber, byte[] buffer, int offset, int length)
+    {
+        var segments = _segmentsPerInvokeId[invokeId];
+
+        if (sequenceNumber == 0)
+        {
+            //copy buffer + encode new adpu header
+            type &= ~BacnetPduTypes.SEGMENTED_MESSAGE;
+            var confirmedServiceRequest = (type & BacnetPduTypes.PDU_TYPE_MASK) == BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST;
+            var adpuHeaderLen = confirmedServiceRequest ? 4 : 3;
+
+            var copy = new byte[length + adpuHeaderLen];
+            Array.Copy(buffer, offset, copy, adpuHeaderLen, length);
+            var encodedBuffer = new EncodeBuffer(copy, 0);
+
+            if (confirmedServiceRequest)
+                APDU.EncodeConfirmedServiceRequest(encodedBuffer, type, service, maxSegments, maxAdpu, invokeId);
+            else
+                APDU.EncodeComplexAck(encodedBuffer, type, service, invokeId);
+
+            segments.Add(Tuple.Create(sequenceNumber, copy)); // doesn't include BVLC or NPDU
+        }
+        else
+        {
+            //copy only content part
+            segments.Add(Tuple.Create(sequenceNumber, buffer.Skip(offset).Take(length).ToArray()));
+        }
+
+        //process when finished
+        if (segments.Count < _expectedSegmentsPerInvokeId[invokeId])
+            return;
+
+        //assemble whole part
+        var apduBuffer = segments.OrderBy(s => s.Item1).SelectMany(s => s.Item2).ToArray();
+        segments.Clear();
+        _expectedSegmentsPerInvokeId[invokeId] = byte.MaxValue;
+
+        //process
+        ProcessApdu(adr, type, apduBuffer, 0, apduBuffer.Length);
+    }
+
+    private void ProcessApdu(BacnetAddress adr, BacnetPduTypes type, byte[] buffer, int offset, int length)
+    {
+        switch (type & BacnetPduTypes.PDU_TYPE_MASK)
+        {
+            case BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST:
+                {
+                    var apduHeaderLen = APDU.DecodeUnconfirmedServiceRequest(buffer, offset, out type, out var service);
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    ProcessUnconfirmedServiceRequest(adr, type, service, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_SIMPLE_ACK:
+                {
+                    var apduHeaderLen = APDU.DecodeSimpleAck(buffer, offset, out type, out var service, out var invokeId);
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    ProcessSimpleAck(adr, type, service, invokeId, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_COMPLEX_ACK:
+                {
+                    var apduHeaderLen = APDU.DecodeComplexAck(buffer, offset, out type, out var service, out var invokeId,
+                        out var sequenceNumber, out var proposedWindowNumber);
+
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) == 0) //don't process segmented messages here
+                    {
+                        ProcessComplexAck(adr, type, service, invokeId, buffer, offset, length);
+                    }
+                    else
+                    {
+                        ProcessSegment(adr, type, service, invokeId, BacnetMaxSegments.MAX_SEG0, BacnetMaxAdpu.MAX_APDU50, false,
+                            sequenceNumber, proposedWindowNumber, buffer, offset, length);
+                    }
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_SEGMENT_ACK:
+                {
+                    var apduHeaderLen = APDU.DecodeSegmentAck(buffer, offset, out type, out var originalInvokeId,
+                        out var sequenceNumber, out var actualWindowSize);
+
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    _lastSegmentAck.Set(adr, originalInvokeId, sequenceNumber, actualWindowSize);
+                    ProcessSegmentAck(adr, type, originalInvokeId, sequenceNumber, actualWindowSize, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_ERROR:
+                {
+                    var apduHeaderLen = APDU.DecodeError(buffer, offset, out type, out var service, out var invokeId);
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    ProcessError(adr, type, service, invokeId, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_ABORT:
+                {
+                    var apduHeaderLen = APDU.DecodeAbort(buffer, offset, out type, out var invokeId, out var reason);
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    ProcessAbort(adr, type, invokeId, reason, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_REJECT:
+                {
+                    var apduHeaderLen = APDU.DecodeReject(buffer, offset, out type, out var invokeId, out var reason);
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+                    ProcessReject(adr, type, invokeId, reason, buffer, offset, length);
+                }
+                break;
+
+            case BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
+                {
+                    var apduHeaderLen = APDU.DecodeConfirmedServiceRequest(buffer, offset, out type, out var service,
+                        out var maxSegments, out var maxAdpu, out var invokeId, out var sequenceNumber, out var proposedWindowNumber);
+
+                    offset += apduHeaderLen;
+                    length -= apduHeaderLen;
+
+                    if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) == 0) //don't process segmented messages here
+                    {
+                        ProcessConfirmedServiceRequest(adr, type, service, maxSegments, maxAdpu, invokeId, buffer, offset, length);
+                    }
+                    else
+                    {
+                        ProcessSegment(adr, type, service, invokeId, maxSegments, maxAdpu, true, sequenceNumber, proposedWindowNumber, buffer, offset, length);
+                    }
+                }
+                break;
+
+            default:
+                Log.Warn($"Something else arrived: {type}");
+                break;
+        }
+    }
+
+    // DAL
+    public void SendNetworkMessage(BacnetAddress adr, byte[] buffer, int bufLen, BacnetNetworkMessageTypes messageType, ushort vendorId = 0)
+    {
+        if (adr == null)
+        {
+            adr = Transport.GetBroadcastAddress();
+        }
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(b, BacnetNpduControls.NetworkLayerMessage, adr, null, 255, messageType, vendorId);
+        b.Add(buffer, bufLen);
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, adr, false, 0);
+    }
+    public void SendIAmRouterToNetwork(ushort[] networks)
+    {
+        var b = GetEncodeBuffer(0);
+        for (int i = 0; i < networks.Length; i++)
+        {
+            ASN1.encode_unsigned16(b, networks[i]);
+        }
+        SendNetworkMessage(null, b.buffer, b.offset, BacnetNetworkMessageTypes.NETWORK_MESSAGE_I_AM_ROUTER_TO_NETWORK);
+    }
+
+    public void SendInitializeRoutingTableAck(BacnetAddress adr, ushort[] networks)
+    {
+        var b = GetEncodeBuffer(0);
+        if (networks != null)
+        {
+            for (int i = 0; i < networks.Length; i++)
+            {
+                ASN1.encode_unsigned16(b, networks[i]);
+            }
+        }
+        SendNetworkMessage(adr, b.buffer, b.offset, BacnetNetworkMessageTypes.NETWORK_MESSAGE_INIT_RT_TABLE_ACK);
+    }
+    public void SendRejectToNetwork(BacnetAddress adr, ushort[] networks)
+    {
+        var b = GetEncodeBuffer(0);
+        /* Sending our DNET doesn't make a lot of sense, does it? */
+        for (int i = 0; i < networks.Length; i++)
+        {
+            ASN1.encode_unsigned16(b, networks[i]);
+        }
+        SendNetworkMessage(adr, b.buffer, b.offset, BacnetNetworkMessageTypes.NETWORK_MESSAGE_REJECT_MESSAGE_TO_NETWORK);
+    }
+    public delegate void NetworkMessageHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, BacnetNetworkMessageTypes npduMessageType, byte[] buffer, int offset, int messageLength);
+    public event NetworkMessageHandler OnNetworkMessage;
+    public delegate void WhoIsRouterToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event WhoIsRouterToNetworkHandler OnWhoIsRouterToNetworkMessage;
+    public delegate void IAmRouterToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event IAmRouterToNetworkHandler OnIAmRouterToNetworkMessage;
+    public delegate void ICouldBeRouterToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event ICouldBeRouterToNetworkHandler OnICouldBeRouterToNetworkMessage;
+    public delegate void RejectMessageToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event RejectMessageToNetworkHandler OnRejectMessageToNetworkMessage;
+    public delegate void RouterBusyToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event RouterBusyToNetworkHandler OnRouterBusyToNetworkMessage;
+    public delegate void RouterAvailableToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event RouterAvailableToNetworkHandler OnRouterAvailableToNetworkMessage;
+    public delegate void InitRtTableToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event InitRtTableToNetworkHandler OnInitRtTableToNetworkMessage;
+    public delegate void InitRtTableAckToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event InitRtTableAckToNetworkHandler OnInitRtTableAckToNetworkMessage;
+    public delegate void EstablishConnectionToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event EstablishConnectionToNetworkHandler OnEstablishConnectionToNetworkMessage;
+    public delegate void DisconnectConnectionToNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event DisconnectConnectionToNetworkHandler OnDisconnectConnectionToNetworkMessage;
+    public delegate void UnrecognizedNetworkHandler(BacnetClient sender, BacnetAddress adr, BacnetNpduControls npduFunction, byte[] buffer, int offset, int messageLength);
+    public event UnrecognizedNetworkHandler OnUnrecognizedNetworkMessage;
+
+    private void ProcessNetworkMessage(BacnetAddress adr, BacnetNpduControls npduFunction, BacnetNetworkMessageTypes npduMessageType, byte[] buffer, int offset, int messageLength)
+    {
+        // DAL I don't want to make a generic router, but I do want to put in enough infrastructure
+        // that I can build on it to route multiple devices in the normal bacnet way.
+        OnNetworkMessage?.Invoke(this, adr, npduFunction, npduMessageType, buffer, offset, messageLength);
+        switch (npduMessageType)
+        {
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK:
+                OnWhoIsRouterToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_I_AM_ROUTER_TO_NETWORK:
+                OnIAmRouterToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_I_COULD_BE_ROUTER_TO_NETWORK:
+                OnICouldBeRouterToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_REJECT_MESSAGE_TO_NETWORK:
+                OnRejectMessageToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_ROUTER_BUSY_TO_NETWORK:
+                OnRouterBusyToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_ROUTER_AVAILABLE_TO_NETWORK:
+                OnRouterAvailableToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_INIT_RT_TABLE:
+                OnInitRtTableToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_INIT_RT_TABLE_ACK:
+                OnInitRtTableAckToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_ESTABLISH_CONNECTION_TO_NETWORK:
+                OnEstablishConnectionToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            case BacnetNetworkMessageTypes.NETWORK_MESSAGE_DISCONNECT_CONNECTION_TO_NETWORK:
+                OnDisconnectConnectionToNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+            default:
+                /* An unrecognized message is bad; send an error response. */
+                OnUnrecognizedNetworkMessage?.Invoke(this, adr, npduFunction, buffer, offset, messageLength);
+                break;
+        }
+    }
+
+    private void OnRecieve(IBacnetTransport sender, byte[] buffer, int offset, int msgLength, BacnetAddress remoteAddress)
+    {
+        try
+        {
+            if (Transport == null)
+                return; //we're disposed 
+
+            if (msgLength <= 0)
+                return;
+
+            // parse
+            var npduLen = NPDU.Decode(buffer, offset, out var npduFunction, out var destination, out var source, out _, out var npduMessageType, out _);
+
+            // Modif FC
+            remoteAddress.RoutedSource = source;
+
+            // DAL
+            remoteAddress.RoutedDestination = destination;
+
+            if (npduLen <= 0)
+                return;
+
+            offset += npduLen;
+            msgLength -= npduLen;
+
+            if (msgLength < 0) // could be 0 for an already parsed
+                return;
+
+            if (npduFunction.HasFlag(BacnetNpduControls.NetworkLayerMessage))
+            {
+                Log.Info("Network Layer message received");
+                // DAL
+                ProcessNetworkMessage(remoteAddress, npduFunction, npduMessageType, buffer, offset, msgLength);
+                return;
+            }
+
+            if (msgLength <= 0)
+                return;
+
+            var apduType = APDU.GetDecodedType(buffer, offset);
+            ProcessApdu(remoteAddress, apduType, buffer, offset, msgLength);
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error in OnRecieve", ex);
+        }
+    }
+
+    // Modif FC
+    public void RegisterAsForeignDevice(string bbmdIp, short ttl, int port = DEFAULT_UDP_PORT)
+    {
+        try
+        {
+            var ep = new IPEndPoint(IPAddress.Parse(bbmdIp), port);
+            var sent = false;
+
+            switch (Transport)
+            {
+                case BacnetIpUdpProtocolTransport t:
+                    sent = t.SendRegisterAsForeignDevice(ep, ttl);
+                    break;
+
+                case BacnetIpV6UdpProtocolTransport t:
+                    sent = t.SendRegisterAsForeignDevice(ep, ttl);
+                    break;
+            }
+
+            if (sent)
+                Log.Debug($"Sending Register as a Foreign Device to {bbmdIp}");
+            else
+                Log.Warn("The given address do not match with the IP version");
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error on RegisterAsForeignDevice (Wrong Transport, not IP ?)", ex);
+        }
+    }
+
+    public void RemoteWhoIs(string bbmdIP, int port = DEFAULT_UDP_PORT, int lowLimit = -1, int highLimit = -1, BacnetAddress source = null)
+    {
+        try
+        {
+            var ep = new IPEndPoint(IPAddress.Parse(bbmdIP), port);
+
+            var b = GetEncodeBuffer(Transport.HeaderLength);
+            var broadcast = Transport.GetBroadcastAddress();
+            NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, broadcast, source);
+            APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_WHO_IS);
+            Services.EncodeWhoIsBroadcast(b, lowLimit, highLimit);
+
+            var sent = false;
+
+            switch (Transport)
+            {
+                case BacnetIpUdpProtocolTransport t:
+                    sent = t.SendRemoteWhois(b.buffer, ep, b.offset);
+                    break;
+
+                case BacnetIpV6UdpProtocolTransport t:
+                    sent = t.SendRemoteWhois(b.buffer, ep, b.offset);
+                    break;
+            }
+
+            if (sent)
+                Log.Debug($"Sending Remote Whois to {bbmdIP}");
+            else
+                Log.Warn("The given address do not match with the IP version");
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Error on Sending Whois to remote BBMD (Wrong Transport, not IP ?)", ex);
+        }
+
+    }
+
+    public void WhoIs(int lowLimit = -1, int highLimit = -1, BacnetAddress receiver = null, BacnetAddress source = null)
+    {
+        if (receiver == null)
+        {
+            // _receiver could be an unicast @ : for direct acces 
+            // usefull on BIP for a known IP:Port, unknown device Id
+            receiver = Transport.GetBroadcastAddress();
+            Log.Debug("Broadcasting WhoIs");
+        }
+        else
+        {
+            Log.Debug($"Sending WhoIs to {receiver}");
+        }
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, receiver, source);
+        APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_WHO_IS);
+        Services.EncodeWhoIsBroadcast(b, lowLimit, highLimit);
+
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, receiver, false, 0);
+    }
+
+    public void Iam(uint deviceId, BacnetSegmentations segmentation = BacnetSegmentations.SEGMENTATION_BOTH, BacnetAddress receiver = null, BacnetAddress source = null)
+    {
+        if (receiver == null)
+        {
+            receiver = Transport.GetBroadcastAddress();
+            Log.Debug($"Broadcasting Iam {deviceId}");
+        }
+        else
+        {
+            Log.Debug($"Sending Iam {deviceId} to {receiver}");
+        }
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, receiver, source);
+        APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_I_AM);
+        Services.EncodeIamBroadcast(b, deviceId, (uint)GetMaxApdu(), segmentation, VendorId);
+
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, receiver, false, 0);
+        //GD.Print(b.buffer.ToStringByHex());
+    }
+
+    public void WhoHas(BacnetObjectId objId, int lowLimit = -1, int highLimit = -1, BacnetAddress receiver = null, BacnetAddress source = null)
+    {
+        WhoHasCore(objId, null, lowLimit, highLimit, receiver, source);
+    }
+
+    public void WhoHas(string objName, int lowLimit = -1, int highLimit = -1, BacnetAddress receiver = null, BacnetAddress source = null)
+    {
+        WhoHasCore(null, objName, lowLimit, highLimit, receiver, source);
+    }
+
+    private void WhoHasCore(BacnetObjectId? objId, string objName, int lowLimit, int highLimit, BacnetAddress receiver, BacnetAddress source)
+    {
+        if (receiver == null)
+        {
+            receiver = Transport.GetBroadcastAddress();
+            Log.Debug($"Broadcasting WhoHas {objId?.ToString() ?? objName}");
+        }
+        else
+        {
+            Log.Debug($"Sending WhoHas {objId?.ToString() ?? objName} to {receiver}");
+        }
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, receiver, source);
+        APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_WHO_HAS);
+        Services.EncodeWhoHasBroadcast(b, lowLimit, highLimit, objId, objName);
+
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, receiver, false, 0);
+    }
+
+    // ReSharper disable once InconsistentNaming
+    public void IHave(BacnetObjectId deviceId, BacnetObjectId objId, string objName, BacnetAddress source = null)
+    {
+        Log.Debug($"Broadcasting IHave {objName} {objId}");
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        var broadcast = Transport.GetBroadcastAddress();
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, broadcast, source);
+        APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_I_HAVE);
+        Services.EncodeIhaveBroadcast(b, deviceId, objId, objName);
+
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, broadcast, false, 0);
+    }
+
+    public void SendUnconfirmedEventNotification(BacnetAddress adr, BacnetEventNotificationData eventData, BacnetAddress source = null)
+    {
+        Log.Debug($"Sending Event Notification {eventData.eventType} {eventData.eventObjectIdentifier}");
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, adr, source);
+        APDU.EncodeUnconfirmedServiceRequest(b, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_EVENT_NOTIFICATION);
+        Services.EncodeEventNotifyUnconfirmed(b, eventData);
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public void SendConfirmedServiceReject(BacnetAddress adr, byte invokeId, BacnetRejectReason reason)
+    {
+        Log.Debug($"Sending Service reject: {reason}");
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeError(b, BacnetPduTypes.PDU_TYPE_REJECT, (BacnetConfirmedServices)reason, invokeId);
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public void SendAbort(BacnetAddress adr, byte invokeId, BacnetAbortReason reason)
+    {
+        // DAL
+        Log.Debug($"Sending Service reject: {reason}");
+
+        var b = GetEncodeBuffer(Transport.HeaderLength);
+
+        NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeError(b, BacnetPduTypes.PDU_TYPE_ABORT, (BacnetConfirmedServices)reason, invokeId);
+        Transport.Send(b.buffer, Transport.HeaderLength, b.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public void SynchronizeTime(BacnetAddress adr, DateTime dateTime, BacnetAddress source = null)
+    {
+        Log.Debug($"Sending Time Synchronize: {dateTime} {dateTime.Kind.ToString().ToUpper()}");
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr, source);
+        APDU.EncodeUnconfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, dateTime.Kind == DateTimeKind.Utc
+                ? BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_UTC_TIME_SYNCHRONIZATION
+                : BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_TIME_SYNCHRONIZATION);
+        Services.EncodeTimeSync(buffer, dateTime);
+        Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+
+    public int GetMaxApdu()
+    {
+        return GetMaxApdu(Transport.MaxAdpuLength);
+    }
+    // DAL
+    public int GetMaxApdu(BacnetMaxAdpu apduLength)
+    {
+        int maxAPDU;
+        switch (apduLength)
+        {
+            case BacnetMaxAdpu.MAX_APDU1476:
+                maxAPDU = 1476;
+                break;
+            case BacnetMaxAdpu.MAX_APDU1024:
+                maxAPDU = 1024;
+                break;
+            case BacnetMaxAdpu.MAX_APDU480:
+                maxAPDU = 480;
+                break;
+            case BacnetMaxAdpu.MAX_APDU206:
+                maxAPDU = 206;
+                break;
+            case BacnetMaxAdpu.MAX_APDU128:
+                maxAPDU = 128;
+                break;
+            case BacnetMaxAdpu.MAX_APDU50:
+                maxAPDU = 50;
+                break;
+            default:
+                throw new NotImplementedException();
+        }
+
+        //max udp payload IRL seems to differ from the expectations in BACnet
+        //so we have to adjust it. (In order to fulfill the standard)
+        const int maxNPDUHeaderLength = 4;       //usually it's '2', but it can also be more than '4'. Beware!
+        return Math.Min(maxAPDU, Transport.MaxBufferLength - Transport.HeaderLength - maxNPDUHeaderLength);
+    }
+
+    public int GetFileBufferMaxSize()
+    {
+        //6 should be the max_apdu_header_length for Confirmed (with segmentation)
+        //12 should be the max_atomic_write_file
+        return GetMaxApdu() - 18;
+    }
+
+    public bool WriteFileRequest(BacnetAddress adr, BacnetObjectId objectId, ref int position, int count, byte[] fileBuffer, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginWriteFileRequest(adr, objectId, position, count, fileBuffer, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndWriteFileRequest(result, out position, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginWriteFileRequest(BacnetAddress adr, BacnetObjectId objectId, int position, int count, byte[] fileBuffer, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending AtomicWriteFileRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_WRITE_FILE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeAtomicWriteFile(buffer, true, objectId, position, 1, new[] { fileBuffer }, new[] { count });
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndWriteFileRequest(IAsyncResult result, out int position, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            //decode
+            if (Services.DecodeAtomicWriteFileAcknowledge(res.Result, 0, res.Result.Length, out _, out position) < 0)
+                ex = new Exception("Decode");
+        }
+        else
+        {
+            position = -1;
+        }
+
+        res.Dispose();
+    }
+
+    public IAsyncResult BeginReadFileRequest(BacnetAddress adr, BacnetObjectId objectId, int position, uint count, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending AtomicReadFileRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        //encode
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_READ_FILE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeAtomicReadFile(buffer, true, objectId, position, count);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndReadFileRequest(IAsyncResult result, out uint count, out int position, out bool endOfFile, out byte[] fileBuffer, out int fileBufferOffset, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            //decode
+            if (Services.DecodeAtomicReadFileAcknowledge(res.Result, 0, res.Result.Length, out endOfFile, out _, out position, out count, out fileBuffer, out fileBufferOffset) < 0)
+                ex = new Exception("Decode");
+        }
+        else
+        {
+            count = 0;
+            endOfFile = true;
+            position = -1;
+            fileBufferOffset = -1;
+            fileBuffer = new byte[0];
+        }
+
+        res.Dispose();
+    }
+
+    public bool ReadFileRequest(BacnetAddress adr, BacnetObjectId objectId, ref int position, ref uint count, out bool endOfFile, out byte[] fileBuffer, out int fileBufferOffset, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginReadFileRequest(adr, objectId, position, count, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReadFileRequest(result, out count, out position, out endOfFile, out fileBuffer, out fileBufferOffset, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        position = -1;
+        count = 0;
+        fileBuffer = null;
+        endOfFile = true;
+        fileBufferOffset = -1;
+        return false;
+    }
+
+    // Read range by postion
+    public IAsyncResult BeginReadRangeRequest(BacnetAddress adr, BacnetObjectId objectId, uint idxBegin, uint quantity, bool waitForTransmit, byte invokeId = 0)
+    {
+        return BeginReadRangeRequestCore(adr, objectId, BacnetReadRangeRequestTypes.RR_BY_POSITION, DateTime.Now, idxBegin, quantity, waitForTransmit, invokeId);
+    }
+
+    // Read range by start time
+    public IAsyncResult BeginReadRangeRequest(BacnetAddress adr, BacnetObjectId objectId, DateTime readFrom, uint quantity, bool waitForTransmit, byte invokeId = 0)
+    {
+        return BeginReadRangeRequestCore(adr, objectId, BacnetReadRangeRequestTypes.RR_BY_TIME, readFrom, 1, quantity, waitForTransmit, invokeId);
+    }
+
+    private IAsyncResult BeginReadRangeRequestCore(BacnetAddress adr, BacnetObjectId objectId, BacnetReadRangeRequestTypes bacnetReadRangeRequestTypes, DateTime readFrom, uint idxBegin, uint quantity, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending ReadRangeRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        //encode
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_READ_RANGE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeReadRange(buffer, objectId, (uint)BacnetPropertyIds.PROP_LOG_BUFFER, ASN1.BACNET_ARRAY_ALL, bacnetReadRangeRequestTypes, idxBegin, readFrom, (int)quantity);
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    // Fc
+    public void EndReadRangeRequest(IAsyncResult result, out byte[] trendbuffer, out uint itemCount, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        itemCount = 0;
+        trendbuffer = null;
+
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(40 * 1000))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            itemCount = Services.DecodeReadRangeAcknowledge(res.Result, 0, res.Result.Length, out trendbuffer);
+            if (itemCount == 0)
+                ex = new Exception("Decode");
+        }
+
+        res.Dispose();
+    }
+
+    // Fc
+    public bool ReadRangeRequest(BacnetAddress adr, BacnetObjectId objectId, DateTime readFrom, ref uint quantity, out byte[] range, byte invokeId = 0)
+    {
+        return ReadRangeRequestCore(BacnetReadRangeRequestTypes.RR_BY_TIME, adr, objectId, 1, readFrom, ref quantity, out range, invokeId);
+    }
+    public bool ReadRangeRequest(BacnetAddress adr, BacnetObjectId objectId, uint idxBegin, ref uint quantity, out byte[] range, byte invokeId = 0)
+    {
+        return ReadRangeRequestCore(BacnetReadRangeRequestTypes.RR_BY_POSITION, adr, objectId, idxBegin, DateTime.Now, ref quantity, out range, invokeId);
+    }
+
+    private bool ReadRangeRequestCore(BacnetReadRangeRequestTypes requestType, BacnetAddress adr, BacnetObjectId objectId, uint idxBegin, DateTime readFrom, ref uint quantity, out byte[] range, byte invokeId = 0)
+    {
+        Func<IAsyncResult> getResult;
+        uint quantityCopy = quantity;
+        switch (requestType)
+        {
+            case BacnetReadRangeRequestTypes.RR_BY_TIME:
+                getResult = () => BeginReadRangeRequest(adr, objectId, readFrom, quantityCopy, true, invokeId);
+                break;
+
+            case BacnetReadRangeRequestTypes.RR_BY_POSITION:
+                getResult = () => BeginReadRangeRequest(adr, objectId, idxBegin, quantityCopy, true, invokeId);
+                break;
+
+            default:
+                throw new NotImplementedException($"BacnetReadRangeRequestTypes-Type {requestType} not supported in {nameof(ReadRangeRequestCore)}!");
+        }
+
+        range = null;
+        using (var result = getResult() as BacnetAsyncResult)
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReadRangeRequest(result, out range, out quantity, out var ex); // quantity read could be less than demanded
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public bool SubscribeCOVRequest(BacnetAddress adr, BacnetObjectId objectId, uint subscribeId, bool cancel, bool issueConfirmedNotifications, uint lifetime, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginSubscribeCOVRequest(adr, objectId, subscribeId, cancel, issueConfirmedNotifications, lifetime, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndSubscribeCOVRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginSubscribeCOVRequest(BacnetAddress adr, BacnetObjectId objectId, uint subscribeId, bool cancel, bool issueConfirmedNotifications, uint lifetime, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending SubscribeCOVRequest {objectId}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_SUBSCRIBE_COV, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeSubscribeCOV(buffer, subscribeId, objectId, cancel, issueConfirmedNotifications, lifetime);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndSubscribeCOVRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    // DAL
+    public bool SendConfirmedEventNotificationRequest(BacnetAddress adr, BacnetEventNotificationData eventData, byte invokeId = 0, BacnetAddress source = null)
+    {
+        using (var result = (BacnetAsyncResult)BeginSendConfirmedEventNotificationRequest(adr, eventData, true, invokeId, source))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndSendConfirmedEventNotificationRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    // DAL
+    public IAsyncResult BeginSendConfirmedEventNotificationRequest(BacnetAddress adr, BacnetEventNotificationData eventData, bool waitForTransmit, byte invokeId = 0, BacnetAddress source = null)
+    {
+        Log.Debug($"Sending Confirmed Event Notification {eventData.eventType} {eventData.eventObjectIdentifier}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr, source);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_EVENT_NOTIFICATION, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeEventNotifyConfirmed(buffer, eventData);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    // DAL
+    public void EndSendConfirmedEventNotificationRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public bool SubscribePropertyRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference monitoredProperty, uint subscribeId, bool cancel, bool issueConfirmedNotifications, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginSubscribePropertyRequest(adr, objectId, monitoredProperty, subscribeId, cancel, issueConfirmedNotifications, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndSubscribePropertyRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginSubscribePropertyRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference monitoredProperty, uint subscribeId, bool cancel, bool issueConfirmedNotifications, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending SubscribePropertyRequest {objectId}.{monitoredProperty}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_SUBSCRIBE_COV_PROPERTY, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeSubscribeProperty(buffer, subscribeId, objectId, cancel, issueConfirmedNotifications, 0, monitoredProperty, false, 0f);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndSubscribePropertyRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public bool ReadPropertyRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyIds propertyId, out IList<BacnetValue> valueList, byte invokeId = 0, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        using (var result = (BacnetAsyncResult)BeginReadPropertyRequest(adr, objectId, propertyId, true, invokeId, arrayIndex))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReadPropertyRequest(result, out valueList, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        valueList = null;
+        return false;
+    }
+
+    public Task<IList<BacnetValue>> ReadPropertyAsync(BacnetAddress address, BacnetObjectTypes objType, uint objInstance,
+        BacnetPropertyIds propertyId, byte invokeId = 0, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        var objectId = new BacnetObjectId(objType, objInstance);
+        return ReadPropertyAsync(address, objectId, propertyId, invokeId, arrayIndex);
+    }
+
+    public Task<IList<BacnetValue>> ReadPropertyAsync(BacnetAddress address, BacnetObjectId objectId,
+        BacnetPropertyIds propertyId, byte invokeId = 0, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        return Task<IList<BacnetValue>>.Factory.StartNew(() =>
+        {
+            if (!ReadPropertyRequest(address, objectId, propertyId, out IList<BacnetValue> result, invokeId, arrayIndex))
+                throw new Exception($"Failed to read property {propertyId} of {objectId} from {address}");
+
+            return result;
+        });
+    }
+
+    public IAsyncResult BeginReadPropertyRequest(BacnetAddress address, BacnetObjectId objectId, BacnetPropertyIds propertyId, bool waitForTransmit, byte invokeId = 0, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        Log.Debug($"Sending ReadPropertyRequest {objectId} {propertyId}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, address.RoutedSource, address.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROPERTY, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeReadProperty(buffer, objectId, (uint)propertyId, arrayIndex);
+
+        //send
+        var ret = new BacnetAsyncResult(this, address, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndReadPropertyRequest(IAsyncResult result, out IList<BacnetValue> valueList, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            //decode
+            if (Services.DecodeReadPropertyAcknowledge(res.Address, res.Result, 0, res.Result.Length, out _, out _, out valueList) < 0)
+                ex = new Exception("Decode");
+        }
+        else
+        {
+            valueList = null;
+        }
+
+        res.Dispose();
+    }
+
+    public bool WritePropertyRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyIds propertyId, IEnumerable<BacnetValue> valueList, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginWritePropertyRequest(adr, objectId, propertyId, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndWritePropertyRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public bool WritePropertyMultipleRequest(BacnetAddress adr, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginWritePropertyMultipleRequest(adr, objectId, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndWritePropertyRequest(result, out var ex); // Share the same with single write
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginWritePropertyRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyIds propertyId, IEnumerable<BacnetValue> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending WritePropertyRequest {objectId} {propertyId}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_WRITE_PROPERTY, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeWriteProperty(buffer, objectId, (uint)propertyId, ASN1.BACNET_ARRAY_ALL, _writepriority, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public IAsyncResult BeginWritePropertyMultipleRequest(BacnetAddress adr, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending WritePropertyMultipleRequest {objectId}");
+        if (invokeId == 0) invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        //BacnetNpduControls.PriorityNormalMessage 
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeWritePropertyMultiple(buffer, objectId, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndWritePropertyRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    // By Chritopher Günter : Write multiple properties on multiple objects
+    public bool WritePropertyMultipleRequest(BacnetAddress adr, ICollection<BacnetReadAccessResult> valueList, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginWritePropertyMultipleRequest(adr, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndWritePropertyRequest(result, out var ex); // Share the same with single write
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginWritePropertyMultipleRequest(BacnetAddress adr, ICollection<BacnetReadAccessResult> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        var objectIds = string.Join(", ", valueList.Select(v => v.objectIdentifier));
+        Log.Debug($"Sending WritePropertyMultipleRequest {objectIds}");
+
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        //BacnetNpduControls.PriorityNormalMessage 
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeWriteObjectMultiple(buffer, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public bool ReadPropertyMultipleRequest(BacnetAddress address, BacnetObjectId objectId, IList<BacnetPropertyReference> propertyIdAndArrayIndex, out IList<BacnetReadAccessResult> values, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginReadPropertyMultipleRequest(address, objectId, propertyIdAndArrayIndex, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReadPropertyMultipleRequest(result, out values, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        values = null;
+        return false;
+    }
+
+    public Task<IList<BacnetPropertyValue>> ReadPropertyMultipleAsync(BacnetAddress address,
+        BacnetObjectTypes objType, uint objInstance, params BacnetPropertyIds[] propertyIds)
+    {
+        var objectId = new BacnetObjectId(objType, objInstance);
+        return ReadPropertyMultipleAsync(address, objectId, propertyIds);
+    }
+
+    public Task<IList<BacnetPropertyValue>> ReadPropertyMultipleAsync(BacnetAddress address,
+        BacnetObjectId objectId, params BacnetPropertyIds[] propertyIds)
+    {
+        var propertyReferences = propertyIds.Select(p =>
+            new BacnetPropertyReference((uint)p, ASN1.BACNET_ARRAY_ALL));
+
+        return Task<IList<BacnetPropertyValue>>.Factory.StartNew(() =>
+        {
+            if (!ReadPropertyMultipleRequest(address, objectId, propertyReferences.ToList(), out var result))
+                throw new Exception($"Failed to read multiple properties of {objectId} from {address}");
+
+            return result.Single().values;
+        });
+    }
+
+    public IAsyncResult BeginReadPropertyMultipleRequest(BacnetAddress adr, BacnetObjectId objectId, IList<BacnetPropertyReference> propertyIdAndArrayIndex, bool waitForTransmit, byte invokeId = 0)
+    {
+        var propertyIds = string.Join(", ", propertyIdAndArrayIndex.Select(v => (BacnetPropertyIds)v.propertyIdentifier));
+        Log.Debug($"Sending ReadPropertyMultipleRequest {objectId} {propertyIds}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROP_MULTIPLE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeReadPropertyMultiple(buffer, objectId, propertyIdAndArrayIndex);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    // Another way to read multiple properties on multiples objects, if supported by devices
+    public bool ReadPropertyMultipleRequest(BacnetAddress address, IList<BacnetReadAccessSpecification> properties, out IList<BacnetReadAccessResult> values, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginReadPropertyMultipleRequest(address, properties, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReadPropertyMultipleRequest(result, out values, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        values = null;
+        return false;
+    }
+
+    public IAsyncResult BeginReadPropertyMultipleRequest(BacnetAddress adr, IList<BacnetReadAccessSpecification> properties, bool waitForTransmit, byte invokeId = 0)
+    {
+        var objectIds = string.Join(", ", properties.Select(v => v.objectIdentifier));
+        Log.Debug($"Sending ReadPropertyMultipleRequest {objectIds}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROP_MULTIPLE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeReadPropertyMultiple(buffer, properties);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndReadPropertyMultipleRequest(IAsyncResult result, out IList<BacnetReadAccessResult> values, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            //decode
+            if (Services.DecodeReadPropertyMultipleAcknowledge(res.Address, res.Result, 0, res.Result.Length, out values) < 0)
+                ex = new Exception("Decode");
+        }
+        else
+        {
+            values = null;
+        }
+
+        res.Dispose();
+    }
+
+    private BacnetPduTypes PduConfirmedServiceRequest()
+    {
+        return MaxSegments != BacnetMaxSegments.MAX_SEG0
+            ? BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST | BacnetPduTypes.SEGMENTED_RESPONSE_ACCEPTED
+            : BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST;
+    }
+
+    // By Christopher Günter
+    public bool CreateObjectRequest(BacnetAddress adr, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList = null, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginCreateObjectRequest(adr, objectId, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndCreateObjectRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginCreateObjectRequest(BacnetAddress adr, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending CreateObjectRequest");
+        if (invokeId == 0) invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), BacnetConfirmedServices.SERVICE_CONFIRMED_CREATE_OBJECT, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeCreateProperty(buffer, objectId, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndCreateObjectRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public bool DeleteObjectRequest(BacnetAddress adr, BacnetObjectId objectId, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginDeleteObjectRequest(adr, objectId, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndDeleteObjectRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+
+        return false;
+    }
+
+    public IAsyncResult BeginDeleteObjectRequest(BacnetAddress adr, BacnetObjectId objectId, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending DeleteObjectRequest");
+        if (invokeId == 0) invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        //NPDU.Encode(b, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply , adr.RoutedSource);
+
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_DELETE_OBJECT, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        ASN1.encode_application_object_id(buffer, objectId.type, objectId.instance);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndDeleteObjectRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public bool AddListElementRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference reference, IList<BacnetValue> valueList, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginAddListElementRequest(adr, objectId, reference, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+
+                if (result.WaitForDone(Timeout))
+                {
+                    EndAddListElementRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        //values = null;
+        return false;
+    }
+
+    public bool RemoveListElementRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference reference, IList<BacnetValue> valueList, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginRemoveListElementRequest(adr, objectId, reference, valueList, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndAddListElementRequest(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        //values = null;
+        return false;
+    }
+
+    public IAsyncResult BeginRemoveListElementRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference reference, IList<BacnetValue> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending RemoveListElementRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_REMOVE_LIST_ELEMENT, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeAddListElement(buffer, objectId, reference.propertyIdentifier, reference.propertyArrayIndex, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public IAsyncResult BeginAddListElementRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyReference reference, IList<BacnetValue> valueList, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending AddListElementRequest {objectId} {(BacnetPropertyIds)reference.propertyIdentifier}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_ADD_LIST_ELEMENT, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeAddListElement(buffer, objectId, reference.propertyIdentifier, reference.propertyArrayIndex, valueList);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndAddListElementRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    // Fc
+    // Read or Write without APDU Data encoding nor Decoding (just Request type, Object id and Property id)
+    // Data is given by the caller starting with the Tag 3 (or maybe another one), and ending with it
+    // return buffer start also with the Tag 3
+    public bool RawEncodedDecodedPropertyConfirmedRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyIds propertyId, BacnetConfirmedServices serviceId, ref byte[] inOutBuffer, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginRawEncodedDecodedPropertyConfirmedRequest(adr, objectId, propertyId, serviceId, inOutBuffer, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndRawEncodedDecodedPropertyConfirmedRequest(result, serviceId, out inOutBuffer, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        inOutBuffer = null;
+        return false;
+    }
+
+    // Fc
+    public IAsyncResult BeginRawEncodedDecodedPropertyConfirmedRequest(BacnetAddress adr, BacnetObjectId objectId, BacnetPropertyIds propertyId, BacnetConfirmedServices serviceId, byte[] inOutBuffer, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending RawEncodedRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), serviceId, MaxSegments, Transport.MaxAdpuLength, invokeId);
+
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, (byte)propertyId);
+
+        // No content encoding to do
+        if (inOutBuffer != null)
+            buffer.Add(inOutBuffer, inOutBuffer.Length);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    // Fc
+    public void EndRawEncodedDecodedPropertyConfirmedRequest(IAsyncResult result, BacnetConfirmedServices serviceId, out byte[] inOutBuffer, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        inOutBuffer = null;
+
+        if (ex == null)
+        {
+            if (serviceId == BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROPERTY)
+            {
+                //decode
+                const int offset = 0;
+                var buffer = res.Result;
+
+                ex = new Exception("Decode");
+
+                if (!ASN1.decode_is_context_tag(buffer, offset, 0))
+                    return;
+                var len = 1;
+                len += ASN1.decode_object_id(buffer, offset + len, out BacnetObjectTypes _, out _);
+                /* Tag 1: Property ID */
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+                if (tagNumber != 1)
+                    return;
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out _);
+
+                inOutBuffer = new byte[buffer.Length - len];
+                Array.Copy(buffer, len, inOutBuffer, 0, inOutBuffer.Length);
+
+                ex = null;
+            }
+        }
+
+        res.Dispose();
+    }
+
+    public bool DeviceCommunicationControlRequest(BacnetAddress adr, uint timeDuration, uint enableDisable, string password, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginDeviceCommunicationControlRequest(adr, timeDuration, enableDisable, password, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndDeviceCommunicationControlRequest(result, out var ex);
+                    return ex == null;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginDeviceCommunicationControlRequest(BacnetAddress adr, uint timeDuration, uint enableDisable, string password, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending DeviceCommunicationControlRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeDeviceCommunicationControl(buffer, timeDuration, enableDisable, password);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndDeviceCommunicationControlRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    // FChaxel
+    public bool GetAlarmSummaryOrEventRequest(BacnetAddress adr, bool getEvent, ref IList<BacnetGetEventInformationData> alarms, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginGetAlarmSummaryOrEventRequest(adr, getEvent, alarms, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndGetAlarmSummaryOrEventRequest(result, getEvent, ref alarms, out var moreEvent, out var ex);
+                    if (ex != null)
+                        return false;
+                    return !moreEvent || GetAlarmSummaryOrEventRequest(adr, getEvent, ref alarms);
+                }
+
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public Task<IList<BacnetGetEventInformationData>> GetEventsAsync(BacnetAddress address, byte invokeId = 0)
+    {
+        IList<BacnetGetEventInformationData> result = new List<BacnetGetEventInformationData>();
+
+        return Task<IList<BacnetGetEventInformationData>>.Factory.StartNew(() =>
+        {
+            if (!GetAlarmSummaryOrEventRequest(address, true, ref result, invokeId))
+                throw new Exception($"Failed to get events from {address}");
+
+            return result;
+        });
+    }
+
+    public IAsyncResult BeginGetAlarmSummaryOrEventRequest(BacnetAddress adr, bool getEvent, IList<BacnetGetEventInformationData> alarms, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending Alarm summary request");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+
+        var service = getEvent
+            ? BacnetConfirmedServices.SERVICE_CONFIRMED_GET_EVENT_INFORMATION
+            : BacnetConfirmedServices.SERVICE_CONFIRMED_GET_ALARM_SUMMARY;
+
+        APDU.EncodeConfirmedServiceRequest(buffer, PduConfirmedServiceRequest(), service, MaxSegments, Transport.MaxAdpuLength, invokeId);
+
+        // Get Next, never true if GetAlarmSummary is usee
+        if (alarms.Count != 0)
+            ASN1.encode_context_object_id(buffer, 0, alarms[alarms.Count - 1].objectIdentifier.type, alarms[alarms.Count - 1].objectIdentifier.instance);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndGetAlarmSummaryOrEventRequest(IAsyncResult result, bool getEvent, ref IList<BacnetGetEventInformationData> alarms, out bool moreEvent, out Exception ex)
+    {
+        moreEvent = false;
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        if (ex == null)
+        {
+            if (Services.DecodeAlarmSummaryOrEvent(res.Result, 0, res.Result.Length, getEvent, ref alarms, out moreEvent) < 0)
+                ex = new Exception("Decode");
+        }
+        else
+        {
+            ex = new Exception("Service not available");
+        }
+
+        res.Dispose();
+    }
+    // DAL
+    public void GetAlarmSummaryOrEventInformationResponse(BacnetAddress adr, bool getEvent, byte invoke_id, Segmentation segmentation, BacnetGetEventInformationData[] data, bool more_events)
+    {
+        // 'getEvent' is not currently used.   Can be used if ever implementing GetAlarmSummary.
+        // response could be segmented
+        // but if you don't want it segmented (which would be normal usage)
+        // you have to compute the message data and the 'more' flag
+        // outside this function.
+        HandleSegmentationResponse(adr, invoke_id, segmentation, (o) =>
+        {
+            SendComplexAck(adr, invoke_id, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_GET_EVENT_INFORMATION, (b) =>
+            {
+                Services.EncodeGetEventInformationAcknowledge(b, data, more_events);
+            });
+        });
+    }
+
+    // FChaxel
+    public bool AlarmAcknowledgement(BacnetAddress adr, BacnetObjectId objId, BacnetEventStates eventState, string ackText, BacnetGenericTime evTimeStamp, BacnetGenericTime ackTimeStamp, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginAlarmAcknowledgement(adr, objId, eventState, ackText, evTimeStamp, ackTimeStamp, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndAlarmAcknowledgement(result, out var ex);
+                    return ex == null;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginAlarmAcknowledgement(BacnetAddress adr, BacnetObjectId objId, BacnetEventStates eventState, string ackText, BacnetGenericTime evTimeStamp, BacnetGenericTime ackTimeStamp, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending AlarmAcknowledgement");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_ACKNOWLEDGE_ALARM, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeAlarmAcknowledge(buffer, 57, objId, (uint)eventState, ackText, evTimeStamp, ackTimeStamp);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndAlarmAcknowledgement(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (!res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+    }
+
+    public bool ReinitializeRequest(BacnetAddress adr, BacnetReinitializedStates state, string password, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginReinitializeRequest(adr, state, password, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndReinitializeRequest(result, out var ex);
+                    return ex == null;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginReinitializeRequest(BacnetAddress adr, BacnetReinitializedStates state, string password, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending ReinitializeRequest");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_REINITIALIZE_DEVICE, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeReinitializeDevice(buffer, state, password);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndReinitializeRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public IAsyncResult BeginConfirmedNotify(BacnetAddress adr, uint subscriberProcessIdentifier, uint initiatingDeviceIdentifier, BacnetObjectId monitoredObjectIdentifier, uint timeRemaining, IList<BacnetPropertyValue> values, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug("Sending Notify (confirmed)");
+        if (invokeId == 0) invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_COV_NOTIFICATION, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeCOVNotifyConfirmed(buffer, subscriberProcessIdentifier, initiatingDeviceIdentifier, monitoredObjectIdentifier, timeRemaining, values);
+
+        //send
+        var ret = new BacnetAsyncResult(this, adr, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndConfirmedNotify(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (!res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+    }
+
+    public bool Notify(BacnetAddress adr, uint subscriberProcessIdentifier, uint initiatingDeviceIdentifier, BacnetObjectId monitoredObjectIdentifier, uint timeRemaining, bool issueConfirmedNotifications, IList<BacnetPropertyValue> values)
+    {
+        if (!issueConfirmedNotifications)
+        {
+            Log.Debug("Sending Notify (unconfirmed)");
+            var buffer = GetEncodeBuffer(Transport.HeaderLength);
+            NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+            APDU.EncodeUnconfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST, BacnetUnconfirmedServices.SERVICE_UNCONFIRMED_COV_NOTIFICATION);
+            Services.EncodeCOVNotifyUnconfirmed(buffer, subscriberProcessIdentifier, initiatingDeviceIdentifier, monitoredObjectIdentifier, timeRemaining, values);
+            // Modif F. Chaxel
+
+            var sendbytes = Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.offset - Transport.HeaderLength, adr, false, 0);
+            return sendbytes == buffer.offset;
+        }
+
+        using (var result = (BacnetAsyncResult)BeginConfirmedNotify(adr, subscriberProcessIdentifier, initiatingDeviceIdentifier, monitoredObjectIdentifier, timeRemaining, values, true))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndConfirmedNotify(result, out var ex);
+                    if (ex != null)
+                        throw ex;
+                    return true;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+
+        return false;
+    }
+
+    public bool LifeSafetyOperationRequest(BacnetAddress address, BacnetObjectId objectId, string requestingSrc, BacnetLifeSafetyOperations operation, byte invokeId = 0)
+    {
+        using (var result = (BacnetAsyncResult)BeginLifeSafetyOperationRequest(address, objectId, 0, requestingSrc, operation, true, invokeId))
+        {
+            for (var r = 0; r < _retries; r++)
+            {
+                if (result.WaitForDone(Timeout))
+                {
+                    EndLifeSafetyOperationRequest(result, out var ex);
+                    return ex == null;
+                }
+                if (r < Retries - 1)
+                    result.Resend();
+            }
+        }
+        return false;
+    }
+
+    public IAsyncResult BeginLifeSafetyOperationRequest(BacnetAddress address, BacnetObjectId objectId, uint processId, string requestingSrc, BacnetLifeSafetyOperations operation, bool waitForTransmit, byte invokeId = 0)
+    {
+        Log.Debug($"Sending {ToTitleCase(operation)} {objectId}");
+        if (invokeId == 0)
+            invokeId = (byte)Interlocked.Increment(ref _invokeId);
+
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage | BacnetNpduControls.ExpectingReply, address.RoutedSource, address.RoutedDestination);
+        APDU.EncodeConfirmedServiceRequest(buffer, BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST, BacnetConfirmedServices.SERVICE_CONFIRMED_LIFE_SAFETY_OPERATION, MaxSegments, Transport.MaxAdpuLength, invokeId);
+        Services.EncodeLifeSafetyOperation(buffer, processId, requestingSrc, (uint)operation, objectId);
+
+        //send
+        var ret = new BacnetAsyncResult(this, address, invokeId, buffer.buffer, buffer.offset - Transport.HeaderLength, waitForTransmit, TransmitTimeout);
+        ret.Resend();
+
+        return ret;
+    }
+
+    public void EndLifeSafetyOperationRequest(IAsyncResult result, out Exception ex)
+    {
+        var res = (BacnetAsyncResult)result;
+        ex = res.Error;
+        if (ex == null && !res.WaitForDone(Timeout))
+            ex = new Exception("Wait Timeout");
+
+        res.Dispose();
+    }
+
+    public static byte GetSegmentsCount(BacnetMaxSegments maxSegments)
+    {
+        switch (maxSegments)
+        {
+            case BacnetMaxSegments.MAX_SEG0:
+                return 0;
+            case BacnetMaxSegments.MAX_SEG2:
+                return 2;
+            case BacnetMaxSegments.MAX_SEG4:
+                return 4;
+            case BacnetMaxSegments.MAX_SEG8:
+                return 8;
+            case BacnetMaxSegments.MAX_SEG16:
+                return 16;
+            case BacnetMaxSegments.MAX_SEG32:
+                return 32;
+            case BacnetMaxSegments.MAX_SEG64:
+                return 64;
+            case BacnetMaxSegments.MAX_SEG65:
+                return 0xFF;
+            default:
+                throw new Exception("Not an option");
+        }
+    }
+
+    public static BacnetMaxSegments GetSegmentsCount(byte maxSegments)
+    {
+        if (maxSegments == 0)
+            return BacnetMaxSegments.MAX_SEG0;
+        if (maxSegments <= 2)
+            return BacnetMaxSegments.MAX_SEG2;
+        if (maxSegments <= 4)
+            return BacnetMaxSegments.MAX_SEG4;
+        if (maxSegments <= 8)
+            return BacnetMaxSegments.MAX_SEG8;
+        if (maxSegments <= 16)
+            return BacnetMaxSegments.MAX_SEG16;
+        if (maxSegments <= 32)
+            return BacnetMaxSegments.MAX_SEG32;
+        if (maxSegments <= 64)
+            return BacnetMaxSegments.MAX_SEG64;
+
+        return BacnetMaxSegments.MAX_SEG65;
+    }
+
+    public Segmentation GetSegmentBuffer(BacnetMaxSegments maxSegments)
+    {
+        if (maxSegments == BacnetMaxSegments.MAX_SEG0)
+            return null;
+
+        return new Segmentation
+        {
+            buffer = GetEncodeBuffer(Transport.HeaderLength),
+            max_segments = GetSegmentsCount(maxSegments),
+            window_size = ProposedWindowSize
+        };
+    }
+
+    private EncodeBuffer EncodeSegmentHeader(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetConfirmedServices service, bool moreFollows)
+    {
+        EncodeBuffer buffer;
+        var isSegmented = false;
+        if (segmentation == null)
+            buffer = GetEncodeBuffer(Transport.HeaderLength);
+        else
+        {
+            buffer = segmentation.buffer;
+            isSegmented = segmentation.sequence_number > 0 | moreFollows;
+        }
+        buffer.Reset(Transport.HeaderLength);
+
+        //encode
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+
+        //set segments limits
+        buffer.max_offset = buffer.offset + GetMaxApdu();
+        var apduHeader = APDU.EncodeComplexAck(buffer, BacnetPduTypes.PDU_TYPE_COMPLEX_ACK | (isSegmented ? BacnetPduTypes.SEGMENTED_MESSAGE | BacnetPduTypes.SERVER : 0) | (moreFollows ? BacnetPduTypes.MORE_FOLLOWS : 0), service, invokeId, segmentation?.sequence_number ?? 0, segmentation?.window_size ?? 0);
+        buffer.min_limit = (GetMaxApdu() - apduHeader) * (segmentation?.sequence_number ?? 0);
+
+        return buffer;
+    }
+
+    private bool EncodeSegment(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetConfirmedServices service, out EncodeBuffer buffer, Action<EncodeBuffer> apduContentEncode)
+    {
+        //encode (regular)
+        buffer = EncodeSegmentHeader(adr, invokeId, segmentation, service, false);
+        apduContentEncode(buffer);
+
+        var moreFollows = (buffer.result & EncodeResult.NotEnoughBuffer) > 0;
+        if (segmentation != null && moreFollows)
+        {
+            //reencode in segmented
+            EncodeSegmentHeader(adr, invokeId, segmentation, service, true);
+            apduContentEncode(buffer);
+            return true;
+        }
+
+        if (moreFollows)
+            return true;
+
+        return segmentation != null && segmentation.sequence_number > 0;
+    }
+
+    /// <summary>
+    /// Handle the segmentation of several too hugh response (if it's accepted by the client) 
+    /// used by ReadRange, ReadProperty, ReadPropertyMultiple & ReadFile responses
+    /// </summary>
+    private void HandleSegmentationResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, Action<Segmentation> transmit)
+    {
+        // send first
+        transmit(segmentation);
+
+        if (segmentation == null || segmentation.buffer.result == EncodeResult.Good)
+            return;
+
+        // start new thread to handle the segment sequence (if required)
+        ThreadPool.QueueUserWorkItem(o =>
+        {
+            var oldMaxInfoFrames = Transport.MaxInfoFrames;
+            Transport.MaxInfoFrames = segmentation.window_size; // increase max_info_frames, to increase throughput. This might be against 'standard'
+
+                while (true)
+            {
+                var moreFollows = (segmentation.buffer.result & EncodeResult.NotEnoughBuffer) > 0;
+
+                    // wait for segmentACK
+                    if ((segmentation.sequence_number - 1) % segmentation.window_size == 0 || !moreFollows)
+                {
+                    if (!WaitForAllTransmits(TransmitTimeout))
+                    {
+                        Log.Warn("Transmit timeout");
+                        break;
+                    }
+
+                    var currentNumber = segmentation.sequence_number;
+
+                    if (!WaitForSegmentAck(adr, invokeId, segmentation, Timeout))
+                    {
+                        Log.Warn("Didn't get segmentACK");
+                        break;
+                    }
+
+                    if (segmentation.sequence_number != currentNumber)
+                    {
+                        Log.Debug("Oh, a retransmit");
+                        moreFollows = true;
+                    }
+                }
+                else
+                {
+                        // a negative segmentACK perhaps
+                        var currentNumber = segmentation.sequence_number;
+                    WaitForSegmentAck(adr, invokeId, segmentation, 0); // don't wait
+
+                        if (segmentation.sequence_number != currentNumber)
+                        Log.Debug("Oh, a retransmit");
+                }
+
+                if (moreFollows)
+                        // lock (m_lockObject) transmit(segmentation);
+                        transmit(segmentation);
+                else
+                    break;
+            }
+
+            Transport.MaxInfoFrames = oldMaxInfoFrames;
+        });
+    }
+
+    private void SendComplexAck(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetConfirmedServices service, Action<EncodeBuffer> apduContentEncode)
+    {
+        Log.Debug($"Sending {ToTitleCase(service)}");
+
+        //encode
+        if (EncodeSegment(adr, invokeId, segmentation, service, out var buffer, apduContentEncode))
+        {
+            //client doesn't support segments
+            if (segmentation == null)
+            {
+                Log.Info("Segmentation denied");
+                // DAL
+                SendAbort(adr, invokeId, BacnetAbortReason.SEGMENTATION_NOT_SUPPORTED);
+                //ErrorResponse(adr, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_APDU_TOO_LONG);
+                buffer.result = EncodeResult.Good;     //don't continue the segmentation
+                return;
+            }
+
+            //first segment? validate max segments
+            if (segmentation.sequence_number == 0)  //only validate first segment
+            {
+                if (segmentation.max_segments != 0xFF && segmentation.buffer.offset > segmentation.max_segments * (GetMaxApdu() - 5))      //5 is adpu header
+                {
+                    Log.Info("Too much segmenation");
+                    // DAL
+                    SendAbort(adr, invokeId, BacnetAbortReason.APDU_TOO_LONG);
+                    //ErrorResponse(adr, service, invokeId, BacnetErrorClasses.ERROR_CLASS_SERVICES, BacnetErrorCodes.ERROR_CODE_ABORT_APDU_TOO_LONG);
+                    buffer.result = EncodeResult.Good;     //don't continue the segmentation
+                    return;
+                }
+                Log.Debug("Segmentation required");
+            }
+
+            //increment before ack can do so (race condition)
+            unchecked { segmentation.sequence_number++; };
+        }
+
+        //send
+        Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.GetLength() - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public void ReadPropertyResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetObjectId objectId, BacnetPropertyReference property, IEnumerable<BacnetValue> value)
+    {
+        HandleSegmentationResponse(adr, invokeId, segmentation, o =>
+        {
+            SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROPERTY, b =>
+            {
+                Services.EncodeReadPropertyAcknowledge(b, objectId, property.propertyIdentifier, property.propertyArrayIndex, value);
+            });
+        });
+    }
+
+    public void CreateObjectResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetObjectId objectId)
+    {
+        SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_CREATE_OBJECT, b =>
+        {
+            Services.EncodeCreateObjectAcknowledge(b, objectId);
+        });
+    }
+
+    public void ReadPropertyMultipleResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, IList<BacnetReadAccessResult> values)
+    {
+        HandleSegmentationResponse(adr, invokeId, segmentation, o =>
+        {
+            SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_READ_PROP_MULTIPLE, b =>
+            {
+                Services.EncodeReadPropertyMultipleAcknowledge(b, values);
+            });
+        });
+    }
+
+    public void ReadRangeResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, BacnetObjectId objectId, BacnetPropertyReference property, BacnetResultFlags status, uint itemCount, byte[] applicationData, BacnetReadRangeRequestTypes requestType, uint firstSequenceNo)
+    {
+        HandleSegmentationResponse(adr, invokeId, segmentation, o =>
+        {
+            SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_READ_RANGE, b =>
+            {
+                Services.EncodeReadRangeAcknowledge(b, objectId, property.propertyIdentifier, property.propertyArrayIndex, BacnetBitString.ConvertFromInt((uint)status), itemCount, applicationData, requestType, firstSequenceNo);
+            });
+        });
+    }
+
+    public void ReadFileResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, int position, uint count, bool endOfFile, byte[] fileBuffer)
+    {
+        HandleSegmentationResponse(adr, invokeId, segmentation, o =>
+        {
+            SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_READ_FILE, b =>
+            {
+                Services.EncodeAtomicReadFileAcknowledge(b, true, endOfFile, position, 1, new[] { fileBuffer }, new[] { (int)count });
+            });
+        });
+    }
+
+    public void WriteFileResponse(BacnetAddress adr, byte invokeId, Segmentation segmentation, int position)
+    {
+        SendComplexAck(adr, invokeId, segmentation, BacnetConfirmedServices.SERVICE_CONFIRMED_ATOMIC_WRITE_FILE, b =>
+        {
+            Services.EncodeAtomicWriteFileAcknowledge(b, true, position);
+        });
+    }
+
+    public void ErrorResponse(BacnetAddress adr, BacnetConfirmedServices service, byte invokeId, BacnetErrorClasses errorClass, BacnetErrorCodes errorCode)
+    {
+        Log.Debug($"Sending ErrorResponse for {service}: {errorCode}");
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeError(buffer, BacnetPduTypes.PDU_TYPE_ERROR, service, invokeId);
+        Services.EncodeError(buffer, errorClass, errorCode);
+        Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public void SimpleAckResponse(BacnetAddress adr, BacnetConfirmedServices service, byte invokeId)
+    {
+        Log.Debug($"Sending SimpleAckResponse for {service}");
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeSimpleAck(buffer, BacnetPduTypes.PDU_TYPE_SIMPLE_ACK, service, invokeId);
+        Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.offset - Transport.HeaderLength, adr, false, 0);
+        // GD.Print(buffer.buffer.ToStringByHex());
+    }
+
+    public void SegmentAckResponse(BacnetAddress adr, bool negative, bool server, byte originalInvokeId, byte sequenceNumber, byte actualWindowSize)
+    {
+        Log.Debug("Sending SegmentAckResponse");
+        var buffer = GetEncodeBuffer(Transport.HeaderLength);
+        NPDU.Encode(buffer, BacnetNpduControls.PriorityNormalMessage, adr.RoutedSource, adr.RoutedDestination);
+        APDU.EncodeSegmentAck(buffer, BacnetPduTypes.PDU_TYPE_SEGMENT_ACK | (negative ? BacnetPduTypes.NEGATIVE_ACK : 0) | (server ? BacnetPduTypes.SERVER : 0), originalInvokeId, sequenceNumber, actualWindowSize);
+        Transport.Send(buffer.buffer, Transport.HeaderLength, buffer.offset - Transport.HeaderLength, adr, false, 0);
+    }
+
+    public bool WaitForAllTransmits(int timeout)
+    {
+        return Transport.WaitForAllTransmits(timeout);
+    }
+
+    public bool WaitForSegmentAck(BacnetAddress adr, byte invokeId, Segmentation segmentation, int timeout)
+    {
+        if (!_lastSegmentAck.Wait(adr, invokeId, timeout))
+            return false;
+
+        segmentation.sequence_number = (byte)((_lastSegmentAck.SequenceNumber + 1) % 256);
+        segmentation.window_size = _lastSegmentAck.WindowSize;
+        return true;
+    }
+
+    private static string ToTitleCase(object obj)
+    {
+        var cultureTextInfo = Thread.CurrentThread.CurrentCulture.TextInfo;
+        return cultureTextInfo.ToTitleCase($"{obj}".ToLower());
+    }
+
+    public void Dispose()
+    {
+        Transport.Dispose();
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BacnetAsyncResult.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BacnetAsyncResult.cs
new file mode 100644
index 0000000..c68af53
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/BacnetAsyncResult.cs
@@ -0,0 +1,158 @@
+namespace System.IO.BACnet;
+
+public class BacnetAsyncResult : IAsyncResult, IDisposable
+{
+    private BacnetClient _comm;
+    private readonly byte _waitInvokeId;
+    private Exception _error;
+    private readonly byte[] _transmitBuffer;
+    private readonly int _transmitLength;
+    private readonly bool _waitForTransmit;
+    private readonly int _transmitTimeout;
+    private ManualResetEvent _waitHandle;
+    private readonly BacnetAddress _address;
+
+    public bool Segmented { get; private set; }
+    public byte[] Result { get; private set; }
+    public object AsyncState { get; set; }
+    public bool CompletedSynchronously { get; private set; }
+    public WaitHandle AsyncWaitHandle => _waitHandle;
+    public bool IsCompleted => _waitHandle.WaitOne(0);
+    public BacnetAddress Address => _address;
+
+    public Exception Error
+    {
+        get => _error;
+        set
+        {
+            _error = value;
+            CompletedSynchronously = true;
+            _waitHandle.Set();
+        }
+    }
+
+    public BacnetAsyncResult(BacnetClient comm, BacnetAddress adr, byte invokeId, byte[] transmitBuffer, int transmitLength, bool waitForTransmit, int transmitTimeout)
+    {
+        _transmitTimeout = transmitTimeout;
+        _address = adr;
+        _waitForTransmit = waitForTransmit;
+        _transmitBuffer = transmitBuffer;
+        _transmitLength = transmitLength;
+        _comm = comm;
+        _waitInvokeId = invokeId;
+        _comm.OnComplexAck += OnComplexAck;
+        _comm.OnError += OnError;
+        _comm.OnAbort += OnAbort;
+        _comm.OnReject += OnReject;
+        _comm.OnSimpleAck += OnSimpleAck;
+        _comm.OnSegment += OnSegment;
+        _waitHandle = new ManualResetEvent(false);
+    }
+
+    public void Resend()
+    {
+        try
+        {
+            if (_comm.Transport.Send(_transmitBuffer, _comm.Transport.HeaderLength, _transmitLength, _address, _waitForTransmit, _transmitTimeout) < 0)
+            {
+                Error = new IOException("Write Timeout");
+            }
+        }
+        catch (Exception ex)
+        {
+            Error = new Exception($"Write Exception: {ex.Message}");
+        }
+    }
+
+    private void OnSegment(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetMaxSegments maxSegments, BacnetMaxAdpu maxAdpu, byte sequenceNumber, byte[] buffer, int offset, int length)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        Segmented = true;
+        _waitHandle.Set();
+    }
+
+    private void OnSimpleAck(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] data, int dataOffset, int dataLength)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        _waitHandle.Set();
+    }
+
+    private void OnAbort(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetAbortReason reason, byte[] buffer, int offset, int length)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        Error = new Exception($"Abort from device, reason: {reason}");
+    }
+
+    private void OnReject(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, byte invokeId, BacnetRejectReason reason, byte[] buffer, int offset, int length)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        Error = new Exception($"Reject from device, reason: {reason}");
+    }
+
+    private void OnError(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, BacnetErrorClasses errorClass, BacnetErrorCodes errorCode, byte[] buffer, int offset, int length)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        Error = new Exception($"Error from device: {errorClass} - {errorCode}");
+    }
+
+    private void OnComplexAck(BacnetClient sender, BacnetAddress adr, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte[] buffer, int offset, int length)
+    {
+        if (invokeId != _waitInvokeId || !adr.Equals(_address))
+            return;
+
+        Segmented = false;
+        Result = new byte[length];
+
+        if (length > 0)
+            Array.Copy(buffer, offset, Result, 0, length);
+
+        //notify waiter even if segmented
+        _waitHandle.Set();
+    }
+
+    /// <summary>
+    /// Will continue waiting until all segments are recieved
+    /// </summary>
+    public bool WaitForDone(int timeout)
+    {
+        while (true)
+        {
+            if (!AsyncWaitHandle.WaitOne(timeout))
+                return false;
+            if (Segmented)
+                _waitHandle.Reset();
+            else
+                return true;
+        }
+    }
+
+    public void Dispose()
+    {
+        if (_comm != null)
+        {
+            _comm.OnComplexAck -= OnComplexAck;
+            _comm.OnError -= OnError;
+            _comm.OnAbort -= OnAbort;
+            _comm.OnReject -= OnReject;
+            _comm.OnSimpleAck -= OnSimpleAck;
+            _comm.OnSegment -= OnSegment;
+            _comm = null;
+        }
+
+        if (_waitHandle != null)
+        {
+            _waitHandle.Dispose();
+            _waitHandle = null;
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BaCnetCalendarEntry.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BaCnetCalendarEntry.cs
new file mode 100644
index 0000000..2005cb2
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BaCnetCalendarEntry.cs
@@ -0,0 +1,69 @@
+namespace System.IO.BACnet;
+
+public struct BACnetCalendarEntry : ASN1.IEncode, ASN1.IDecode
+{
+    public List<object> Entries; // BacnetDate or BacnetDateRange or BacnetweekNDay
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        if (Entries == null)
+            return;
+
+        foreach (ASN1.IEncode entry in Entries)
+        {
+            if (entry is BacnetDate)
+            {
+                ASN1.encode_tag(buffer, 0, true, 4);
+                entry.Encode(buffer);
+            }
+
+            if (entry is BacnetDateRange)
+            {
+                ASN1.encode_opening_tag(buffer, 1);
+                entry.Encode(buffer);
+                ASN1.encode_closing_tag(buffer, 1);
+            }
+
+            if (entry is BacnetweekNDay)
+            {
+                ASN1.encode_tag(buffer, 2, true, 3);
+                entry.Encode(buffer);
+            }
+        }
+    }
+
+    public int Decode(byte[] buffer, int offset, uint count)
+    {
+        var len = 0;
+
+        Entries = new List<object>();
+
+        while (true)
+        {
+            len += ASN1.decode_tag_number(buffer, offset + len, out byte tagNumber);
+
+            switch (tagNumber)
+            {
+                case 0:
+                    var bdt = new BacnetDate();
+                    len += bdt.Decode(buffer, offset + len, count);
+                    Entries.Add(bdt);
+                    break;
+                case 1:
+                    var bdr = new BacnetDateRange();
+                    len += bdr.Decode(buffer, offset + len, count);
+                    Entries.Add(bdr);
+                    len++; // closing tag
+                    break;
+                case 2:
+                    var bwd = new BacnetweekNDay();
+                    len += bwd.Decode(buffer, offset + len, count);
+                    Entries.Add(bwd);
+                    break;
+                default:
+                    return len - 1; // closing Tag
+            }
+        }
+
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAbortReason.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAbortReason.cs
new file mode 100644
index 0000000..3398b7e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAbortReason.cs
@@ -0,0 +1,84 @@
+namespace System.IO.BACnet;
+
+/// <summary>
+/// Reason the transaction with the indicated invoke ID is being aborted.
+/// </summary>
+/// <remarks>
+/// Enumerated values 0-63 are reserved for definition by ASHRAE.
+/// Enumerated values 64-255 may be used by others.
+/// </remarks>
+public enum BacnetAbortReason
+{
+    /// <summary>
+    /// This abort reason is returned for a reason other than any of those previously enumerated.
+    /// </summary>
+    OTHER = 0,
+
+    /// <summary>
+    /// A buffer capacity has been exceeded.
+    /// </summary>
+    BUFFER_OVERFLOW = 1,
+
+    /// <summary>
+    /// Generated in response to an APDU that is not expected in the present
+    /// state of the Transaction State Machine.
+    /// </summary>
+    INVALID_APDU_IN_THIS_STATE = 2,
+
+    /// <summary>
+    /// The transaction shall be aborted to permit higher priority processing.
+    /// </summary>
+    PREEMPTED_BY_HIGHER_PRIORITY_TASK = 3,
+
+    /// <summary>
+    /// Generated in response to an APDU that has its segmentation bit set to TRUE
+    /// when the receiving device does not support segmentation. It is also generated
+    /// when a BACnet-ComplexACKPDU is large enough to require segmentation but it
+    /// cannot be transmitted because either the transmitting device or the receiving
+    /// device does not support segmentation. 
+    /// </summary>
+    SEGMENTATION_NOT_SUPPORTED = 4,
+
+    /// <summary>
+    /// The Transaction is aborted due to receipt of a security error.
+    /// </summary>
+    SECURITY_ERROR = 5,
+
+    /// <summary>
+    /// The transaction is aborted due to receipt of a PDU secured differently
+    /// than the original PDU of the transaction.
+    /// </summary>
+    INSUFFICIENT_SECURITY = 6,
+
+    /// <summary>
+    ///  A device receives a request that is segmented, or receives any segment of
+    /// a segmented request, where the Proposed Window Size field of the PDU header
+    /// is either zero or greater than 127.
+    /// </summary>
+    WINDOW_SIZE_OUT_OF_RANGE = 7,
+
+    /// <summary>
+    /// A device receives a confirmed request but its application layer has
+    /// not responded within the published APDU Timeout period.
+    /// </summary>
+    APPLICATION_EXCEEDED_REPLY_TIME = 8,
+
+    /// <summary>
+    /// A device receives a request but cannot start processing because it has run
+    /// out of some internal resource. 
+    /// </summary>
+    OUT_OF_RESOURCES = 9,
+
+    /// <summary>
+    /// A transaction state machine timer exceeded the timeout applicable for the
+    /// current state, causing the transaction machine to abort the transaction.
+    /// </summary>
+    TSM_TIMEOUT = 10,
+
+    /// <summary>
+    /// An APDU was received from the local application program whose overall
+    /// size exceeds the maximum transmittable length or exceeds the maximum
+    /// number of segments accepted by the server.
+    /// </summary>
+    APDU_TOO_LONG = 11
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddress.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddress.cs
new file mode 100644
index 0000000..5f39ce8
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddress.cs
@@ -0,0 +1,196 @@
+namespace System.IO.BACnet;
+
+public class BacnetAddress : ASN1.IEncode
+{
+    public ushort net;
+    public byte[] adr;
+    public byte[] VMac = new byte[3]; // for IP V6, could be integrated also as 3 additional bytes in adr
+    public BacnetAddressTypes type;
+
+    // Modif FC
+    public BacnetAddress RoutedSource = null;
+
+    // DAL
+    public BacnetAddress RoutedDestination = null;
+
+    public BacnetAddress(BacnetAddressTypes addressType, ushort network = 0, byte[] address = null)
+    {
+        type = addressType;
+        net = network;
+        adr = address;
+    }
+
+    public BacnetAddress(BacnetAddressTypes addressType, string address = null, ushort network = 0)
+        : this(addressType, network)
+    {
+        if (address == null)
+            return;
+
+        switch (type)
+        {
+            case BacnetAddressTypes.IP:
+                adr = new byte[6];
+                var addressParts = address.Split(':');
+                var addressBytes = IPAddress.Parse(addressParts[0]).GetAddressBytes();
+                Array.Copy(addressBytes, adr, addressBytes.Length);
+
+                var portBytes = BitConverter.GetBytes(addressParts.Length > 1
+                    ? ushort.Parse(addressParts[1])
+                    : (ushort)0xBAC0);
+
+                if (BitConverter.IsLittleEndian)
+                    portBytes = portBytes.Reverse().ToArray();
+
+                Array.Copy(portBytes, 0, adr, addressBytes.Length, portBytes.Length);
+                break;
+
+            case BacnetAddressTypes.Ethernet:
+                adr = PhysicalAddress.Parse(address).GetAddressBytes();
+                break;
+
+            default:
+                throw new NotSupportedException("String format is not supported for address type " + type);
+        }
+    }
+
+    public override int GetHashCode()
+    {
+        // DAL this was originally broken...
+        var str = Convert.ToBase64String(adr);
+        return str.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return ToString(type);
+    }
+
+    public string ToString(BacnetAddressTypes addressType)
+    {
+        while (true)
+        {
+            switch (addressType)
+            {
+                case BacnetAddressTypes.IP:
+                    return adr != null && adr.Length >= 6
+                        ? $"{adr[0]}.{adr[1]}.{adr[2]}.{adr[3]}:{(adr[4] << 8) | adr[5]}"
+                        : "0.0.0.0";
+
+                case BacnetAddressTypes.MSTP:
+                    return adr != null && adr.Length >= 1
+                        ? $"{adr[0]}"
+                        : "-1";
+
+                case BacnetAddressTypes.PTP:
+                    return "x";
+
+                case BacnetAddressTypes.Ethernet:
+                    return $"{new PhysicalAddress(adr)}";
+
+                case BacnetAddressTypes.IPV6:
+                    return adr != null && adr.Length == 18
+                        ? $"{new IPAddress(adr.Take(16).ToArray())}:{(adr[16] << 8) | adr[17]}"
+                        : "[::]";
+
+                default: // Routed @ are always like this, NPDU do not contains the MAC type, only the lenght
+                    if (adr == null || adr.Length == 0)
+                        return "?";
+
+                    switch (adr.Length)
+                    {
+                        case 6: // certainly IP, but not sure (Newron System send it for internal usage with 4*0 bytes)
+                            addressType = BacnetAddressTypes.IP;
+                            continue;
+
+                        case 18: // Not sure it could appears, since NPDU may contains Vmac ?
+                            addressType = BacnetAddressTypes.IPV6;
+                            continue;
+
+                        case 3:
+                            return $"IPv6 VMac : {adr[0] << 16 | (adr[1] << 8) | adr[2]}";
+
+                        default:
+                            return string.Join(" ", adr);
+                    }
+            }
+        }
+    }
+
+    public string ToString(bool sourceOnly)
+    {
+        if (RoutedSource == null)
+            return ToString();
+
+        return sourceOnly
+            ? RoutedSource.ToString()
+            : $"{RoutedSource} via {ToString()}";
+    }
+
+    public bool HasAddress(IPAddress ipAddress)
+    {
+        if (type != BacnetAddressTypes.IP || adr == null || ipAddress == null)
+            return false;
+
+        return adr.Take(4).SequenceEqual(ipAddress.GetAddressBytes());
+    }
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not BacnetAddress) return false;
+        var d = (BacnetAddress)obj;
+        if (adr == null && d.adr == null) return true;
+        if (adr == null || d.adr == null) return false;
+        if (adr.Length != d.adr.Length) return false;
+        if (adr.Where((t, i) => t != d.adr[i]).Any())
+            return false;
+
+        // Modif FC
+        if (RoutedSource == null && d.RoutedSource != null)
+            return false;
+
+        // DAL
+        if (RoutedDestination == null && d.RoutedDestination != null)
+            return false;
+
+        if (d.RoutedSource == null && RoutedSource == null &&
+            d.RoutedDestination == null && RoutedDestination == null)
+            return true;
+
+        bool rv = RoutedSource?.Equals(d.RoutedSource) ?? false;
+        rv |= RoutedDestination?.Equals(d.RoutedDestination) ?? false;
+        return rv;
+    }
+
+    // checked if device is routed by curent equipement
+    public bool IsMyRouter(BacnetAddress device)
+    {
+        if (device.RoutedSource == null || RoutedSource != null)
+            return false;
+
+        if (adr.Length != device.adr.Length)
+            return false;
+
+        return !adr.Where((t, i) => t != device.adr[i]).Any();
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        ASN1.encode_opening_tag(buffer, 1);
+        ASN1.encode_application_unsigned(buffer, net);
+        ASN1.encode_application_octet_string(buffer, adr, 0, adr.Length);
+        ASN1.encode_closing_tag(buffer, 1);
+    }
+
+    public string FullHashString()
+    {
+        var hash = $"{(uint)type}.{net}.{string.Concat(adr.Select(a => a.ToString("X2")))}";
+
+        if (RoutedSource != null)
+            hash += $":{RoutedSource.FullHashString()}";
+
+        if (RoutedDestination != null)
+            hash += $":{RoutedDestination.FullHashString()}";
+
+        return hash;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddressTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddressTypes.cs
new file mode 100644
index 0000000..7b67377
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetAddressTypes.cs
@@ -0,0 +1,13 @@
+namespace System.IO.BACnet;
+
+public enum BacnetAddressTypes
+{
+    None,
+    IP,
+    MSTP,
+    Ethernet,
+    ArcNet,
+    LonTalk,
+    PTP,
+    IPV6
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetApplicationTags.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetApplicationTags.cs
new file mode 100644
index 0000000..4369ad5
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetApplicationTags.cs
@@ -0,0 +1,65 @@
+namespace System.IO.BACnet;
+
+public enum BacnetApplicationTags
+{
+    BACNET_APPLICATION_TAG_NULL = 0,
+    BACNET_APPLICATION_TAG_BOOLEAN = 1,
+    BACNET_APPLICATION_TAG_UNSIGNED_INT = 2,
+    BACNET_APPLICATION_TAG_SIGNED_INT = 3,
+    BACNET_APPLICATION_TAG_REAL = 4,
+    BACNET_APPLICATION_TAG_DOUBLE = 5,
+    BACNET_APPLICATION_TAG_OCTET_STRING = 6,
+    BACNET_APPLICATION_TAG_CHARACTER_STRING = 7,
+    BACNET_APPLICATION_TAG_BIT_STRING = 8,
+    BACNET_APPLICATION_TAG_ENUMERATED = 9,
+    BACNET_APPLICATION_TAG_DATE = 10,
+    BACNET_APPLICATION_TAG_TIME = 11,
+    BACNET_APPLICATION_TAG_OBJECT_ID = 12,
+    BACNET_APPLICATION_TAG_RESERVE1 = 13,
+    BACNET_APPLICATION_TAG_RESERVE2 = 14,
+    BACNET_APPLICATION_TAG_RESERVE3 = 15,
+    MAX_BACNET_APPLICATION_TAG = 16,
+
+    /* Extra stuff - complex tagged data - not specifically enumerated */
+
+    /* Means : "nothing", an empty list, not even a null character */
+    BACNET_APPLICATION_TAG_EMPTYLIST,
+    /* BACnetWeeknday */
+    BACNET_APPLICATION_TAG_WEEKNDAY,
+    /* BACnetDateRange */
+    BACNET_APPLICATION_TAG_DATERANGE,
+    /* BACnetDateTime */
+    BACNET_APPLICATION_TAG_DATETIME,
+    /* BACnetTimeStamp */
+    BACNET_APPLICATION_TAG_TIMESTAMP,
+    /* Error Class, Error Code */
+    BACNET_APPLICATION_TAG_ERROR,
+    /* BACnetDeviceObjectPropertyReference */
+    BACNET_APPLICATION_TAG_DEVICE_OBJECT_PROPERTY_REFERENCE,
+    /* BACnetDeviceObjectReference */
+    BACNET_APPLICATION_TAG_DEVICE_OBJECT_REFERENCE,
+    /* BACnetObjectPropertyReference */
+    BACNET_APPLICATION_TAG_OBJECT_PROPERTY_REFERENCE,
+    /* BACnetDestination (Recipient_List) */
+    BACNET_APPLICATION_TAG_DESTINATION,
+    /* BACnetRecipient */
+    BACNET_APPLICATION_TAG_RECIPIENT,
+    /* BACnetCOVSubscription */
+    BACNET_APPLICATION_TAG_COV_SUBSCRIPTION,
+    /* BACnetCalendarEntry */
+    BACNET_APPLICATION_TAG_CALENDAR_ENTRY,
+    /* BACnetWeeklySchedule */
+    BACNET_APPLICATION_TAG_WEEKLY_SCHEDULE,
+    /* BACnetSpecialEvent */
+    BACNET_APPLICATION_TAG_SPECIAL_EVENT,
+    /* BACnetReadAccessSpecification */
+    BACNET_APPLICATION_TAG_READ_ACCESS_SPECIFICATION,
+    /* BACnetReadAccessResult */
+    BACNET_APPLICATION_TAG_READ_ACCESS_RESULT,
+    /* BACnetLightingCommand */
+    BACNET_APPLICATION_TAG_LIGHTING_COMMAND,
+    BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_DECODED,
+    BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_ENCODED,
+    /* BACnetLogRecord */
+    BACNET_APPLICATION_TAG_LOG_RECORD
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBinaryPv.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBinaryPv.cs
new file mode 100644
index 0000000..13553bd
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBinaryPv.cs
@@ -0,0 +1,10 @@
+namespace System.IO.BACnet.Base;
+
+public enum BacnetBinaryPv : byte
+{
+    MIN_BINARY_PV = 0,  /* for validating incoming values */
+    BINARY_INACTIVE = 0,
+    BINARY_ACTIVE = 1,
+    MAX_BINARY_PV = 1,  /* for validating incoming values */
+    BINARY_NULL = 255   /* our homemade way of storing this info */
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBitString.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBitString.cs
new file mode 100644
index 0000000..c2df69e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBitString.cs
@@ -0,0 +1,91 @@
+namespace System.IO.BACnet;
+
+public struct BacnetBitString
+{
+    public byte bits_used;
+    public byte[] value;
+
+    public byte Length => bits_used;
+    public bool this[byte bitNumber] => GetBit(bitNumber);
+
+    public override string ToString()
+    {
+        var ret = "";
+        for (var i = 0; i < bits_used; i++)
+        {
+            ret += ((value[i / 8] & (1 << (i % 8))) > 0 ? "1" : "0");
+        }
+        return ret;
+    }
+
+    public void SetBit(byte bitNumber, bool v)
+    {
+        var byteNumber = (byte)(bitNumber / 8);
+        byte bitMask = 1;
+
+        if (value == null)
+            value = new byte[ASN1.MAX_BITSTRING_BYTES];
+
+        if (byteNumber < ASN1.MAX_BITSTRING_BYTES)
+        {
+            /* set max bits used */
+            if (bits_used < bitNumber + 1)
+                bits_used = (byte)(bitNumber + 1);
+            bitMask = (byte)(bitMask << (bitNumber - byteNumber * 8));
+            if (v)
+                value[byteNumber] |= bitMask;
+            else
+                value[byteNumber] &= (byte)~bitMask;
+        }
+    }
+
+    public bool GetBit(byte bitNumber)
+    {
+        var byteNumber = (byte)(bitNumber / 8);
+
+        if (byteNumber >= ASN1.MAX_BITSTRING_BYTES || bitNumber >= bits_used)
+            throw new ArgumentOutOfRangeException(nameof(bitNumber));
+
+        if (value == null)
+            return false;
+
+        var bitMask = (byte)(1 << (bitNumber - byteNumber * 8));
+        return (value[byteNumber] & bitMask) > 0;
+    }
+
+    public static BacnetBitString Parse(string str)
+    {
+        var ret = new BacnetBitString
+        {
+            value = new byte[ASN1.MAX_BITSTRING_BYTES]
+        };
+
+        if (string.IsNullOrEmpty(str))
+            return ret;
+
+        ret.bits_used = (byte)str.Length;
+        for (var i = 0; i < ret.bits_used; i++)
+        {
+            var isSet = str[i] == '1';
+            if (isSet) ret.value[i / 8] |= (byte)(1 << (i % 8));
+        }
+
+        return ret;
+    }
+
+    public uint ConvertToInt()
+    {
+        return value != null
+            ? BitConverter.ToUInt32(value, 0)
+            : 0;
+    }
+
+    public static BacnetBitString ConvertFromInt(uint value)
+    {
+        return new BacnetBitString
+        {
+            value = BitConverter.GetBytes(value),
+            bits_used = (byte)Math.Ceiling(Math.Log(value, 2))
+        };
+    }
+};
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcFunctions.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcFunctions.cs
new file mode 100644
index 0000000..7825d78
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcFunctions.cs
@@ -0,0 +1,18 @@
+namespace System.IO.BACnet;
+
+public enum BacnetBvlcFunctions : byte
+{
+    BVLC_RESULT = 0,
+    BVLC_WRITE_BROADCAST_DISTRIBUTION_TABLE = 1,
+    BVLC_READ_BROADCAST_DIST_TABLE = 2,
+    BVLC_READ_BROADCAST_DIST_TABLE_ACK = 3,
+    BVLC_FORWARDED_NPDU = 4,
+    BVLC_REGISTER_FOREIGN_DEVICE = 5,
+    BVLC_READ_FOREIGN_DEVICE_TABLE = 6,
+    BVLC_READ_FOREIGN_DEVICE_TABLE_ACK = 7,
+    BVLC_DELETE_FOREIGN_DEVICE_TABLE_ENTRY = 8,
+    BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK = 9,
+    BVLC_ORIGINAL_UNICAST_NPDU = 10,
+    BVLC_ORIGINAL_BROADCAST_NPDU = 11,
+    MAX_BVLC_FUNCTION = 12
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcResults.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcResults.cs
new file mode 100644
index 0000000..1c0ee01
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcResults.cs
@@ -0,0 +1,12 @@
+namespace System.IO.BACnet;
+
+public enum BacnetBvlcResults : ushort
+{
+    BVLC_RESULT_SUCCESSFUL_COMPLETION = 0x0000,
+    BVLC_RESULT_WRITE_BROADCAST_DISTRIBUTION_TABLE_NAK = 0x0010,
+    BVLC_RESULT_READ_BROADCAST_DISTRIBUTION_TABLE_NAK = 0x0020,
+    BVLC_RESULT_REGISTER_FOREIGN_DEVICE_NAK = 0X0030,
+    BVLC_RESULT_READ_FOREIGN_DEVICE_TABLE_NAK = 0x0040,
+    BVLC_RESULT_DELETE_FOREIGN_DEVICE_TABLE_ENTRY_NAK = 0x0050,
+    BVLC_RESULT_DISTRIBUTE_BROADCAST_TO_NETWORK_NAK = 0x0060
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Functions.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Functions.cs
new file mode 100644
index 0000000..9c51df5
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Functions.cs
@@ -0,0 +1,18 @@
+namespace System.IO.BACnet;
+
+public enum BacnetBvlcV6Functions : byte
+{
+    BVLC_RESULT = 0,
+    BVLC_ORIGINAL_UNICAST_NPDU = 1,
+    BVLC_ORIGINAL_BROADCAST_NPDU = 2,
+    BVLC_ADDRESS_RESOLUTION = 3,
+    BVLC_FORWARDED_ADDRESS_RESOLUTION = 4,
+    BVLC_ADDRESS_RESOLUTION_ACK = 5,
+    BVLC_VIRTUAL_ADDRESS_RESOLUTION = 6,
+    BVLC_VIRTUAL_ADDRESS_RESOLUTION_ACK = 7,
+    BVLC_FORWARDED_NPDU = 8,
+    BVLC_REGISTER_FOREIGN_DEVICE = 9,
+    BVLC_DELETE_FOREIGN_DEVICE_TABLE_ENTRY = 0xA,
+    BVLC_SECURE_BVLC = 0xB,
+    BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK = 0xC
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Results.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Results.cs
new file mode 100644
index 0000000..f8967d3
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetBvlcV6Results.cs
@@ -0,0 +1,10 @@
+namespace System.IO.BACnet;
+
+public enum BacnetBvlcV6Results : ushort
+{
+    SUCCESSFUL_COMPLETION = 0x0000,
+    ADDRESS_RESOLUTION_NAK = 0x0030,
+    VIRTUAL_ADDRESS_RESOLUTION_NAK = 0x0060,
+    REGISTER_FOREIGN_DEVICE_NAK = 0X0090,
+    DISTRIBUTE_BROADCAST_TO_NETWORK_NAK = 0x00B0
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCOVSubscription.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCOVSubscription.cs
new file mode 100644
index 0000000..abf0db9
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCOVSubscription.cs
@@ -0,0 +1,15 @@
+namespace System.IO.BACnet;
+
+public struct BacnetCOVSubscription
+{
+    /* BACnetRecipientProcess */
+    public BacnetAddress Recipient;
+    public uint subscriptionProcessIdentifier;
+    /* BACnetObjectPropertyReference */
+    public BacnetObjectId monitoredObjectIdentifier;
+    public BacnetPropertyReference monitoredProperty;
+    /* BACnetCOVSubscription */
+    public bool IssueConfirmedNotifications;
+    public uint TimeRemaining;
+    public float COVIncrement;
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCharacterStringEncodings.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCharacterStringEncodings.cs
new file mode 100644
index 0000000..928e48d
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetCharacterStringEncodings.cs
@@ -0,0 +1,13 @@
+namespace System.IO.BACnet;
+
+public enum BacnetCharacterStringEncodings
+{
+    CHARACTER_ANSI_X34 = 0,  /* deprecated : Addendum 135-2008k  */
+    CHARACTER_UTF8 = 0,
+    CHARACTER_MS_DBCS = 1,
+    CHARACTER_JISC_6226 = 2, /* deprecated : Addendum 135-2008k  */
+    CHARACTER_JISX_0208 = 2,
+    CHARACTER_UCS4 = 3,
+    CHARACTER_UCS2 = 4,
+    CHARACTER_ISO8859 = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetConfirmedServices.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetConfirmedServices.cs
new file mode 100644
index 0000000..a1aa49c
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetConfirmedServices.cs
@@ -0,0 +1,47 @@
+namespace System.IO.BACnet;
+
+public enum BacnetConfirmedServices : byte
+{
+    /* Alarm and Event Services */
+    SERVICE_CONFIRMED_ACKNOWLEDGE_ALARM = 0,
+    SERVICE_CONFIRMED_COV_NOTIFICATION = 1,
+    SERVICE_CONFIRMED_EVENT_NOTIFICATION = 2,
+    SERVICE_CONFIRMED_GET_ALARM_SUMMARY = 3,
+    SERVICE_CONFIRMED_GET_ENROLLMENT_SUMMARY = 4,
+    SERVICE_CONFIRMED_GET_EVENT_INFORMATION = 29,
+    SERVICE_CONFIRMED_SUBSCRIBE_COV = 5,
+    SERVICE_CONFIRMED_SUBSCRIBE_COV_PROPERTY = 28,
+    SERVICE_CONFIRMED_LIFE_SAFETY_OPERATION = 27,
+    /* File Access Services */
+    SERVICE_CONFIRMED_ATOMIC_READ_FILE = 6,
+    SERVICE_CONFIRMED_ATOMIC_WRITE_FILE = 7,
+    /* Object Access Services */
+    SERVICE_CONFIRMED_ADD_LIST_ELEMENT = 8,
+    SERVICE_CONFIRMED_REMOVE_LIST_ELEMENT = 9,
+    SERVICE_CONFIRMED_CREATE_OBJECT = 10,
+    SERVICE_CONFIRMED_DELETE_OBJECT = 11,
+    SERVICE_CONFIRMED_READ_PROPERTY = 12,
+    SERVICE_CONFIRMED_READ_PROP_CONDITIONAL = 13,
+    SERVICE_CONFIRMED_READ_PROP_MULTIPLE = 14,
+    SERVICE_CONFIRMED_READ_RANGE = 26,
+    SERVICE_CONFIRMED_WRITE_PROPERTY = 15,
+    SERVICE_CONFIRMED_WRITE_PROP_MULTIPLE = 16,
+    /* Remote Device Management Services */
+    SERVICE_CONFIRMED_DEVICE_COMMUNICATION_CONTROL = 17,
+    SERVICE_CONFIRMED_PRIVATE_TRANSFER = 18,
+    SERVICE_CONFIRMED_TEXT_MESSAGE = 19,
+    SERVICE_CONFIRMED_REINITIALIZE_DEVICE = 20,
+    /* Virtual Terminal Services */
+    SERVICE_CONFIRMED_VT_OPEN = 21,
+    SERVICE_CONFIRMED_VT_CLOSE = 22,
+    SERVICE_CONFIRMED_VT_DATA = 23,
+    /* Security Services */
+    SERVICE_CONFIRMED_AUTHENTICATE = 24,
+    SERVICE_CONFIRMED_REQUEST_KEY = 25,
+    /* Services added after 1995 */
+    /* readRange (26) see Object Access Services */
+    /* lifeSafetyOperation (27) see Alarm and Event Services */
+    /* subscribeCOVProperty (28) see Alarm and Event Services */
+    /* getEventInformation (29) see Alarm and Event Services */
+    MAX_BACNET_CONFIRMED_SERVICE = 30
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDate.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDate.cs
new file mode 100644
index 0000000..9298ab6
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDate.cs
@@ -0,0 +1,125 @@
+namespace System.IO.BACnet;
+
+public struct BacnetDate : ASN1.IEncode, ASN1.IDecode
+{
+    public byte year;     /* 255 any */
+    public byte month;      /* 1=Jan; 255 any, 13 Odd, 14 Even */
+    public byte day;        /* 1..31; 32 last day of the month; 255 any */
+    public byte wday;       /* 1=Monday-7=Sunday, 255 any */
+
+    public BacnetDate(byte year, byte month, byte day, byte wday = 255)
+    {
+        this.year = year;
+        this.month = month;
+        this.day = day;
+        this.wday = wday;
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        buffer.Add(year);
+        buffer.Add(month);
+        buffer.Add(day);
+        buffer.Add(wday);
+    }
+
+    public int Decode(byte[] buffer, int offset, uint count)
+    {
+        year = buffer[offset];
+        month = buffer[offset + 1];
+        day = buffer[offset + 2];
+        wday = buffer[offset + 3];
+        return 4;
+    }
+
+    public bool IsPeriodic => year == 255 || month > 12 || day == 255;
+
+    public bool IsAFittingDate(DateTime date)
+    {
+        if (date.Year != year + 1900 && year != 255)
+            return false;
+
+        if (date.Month != month && month != 255 && month != 13 && month != 14)
+            return false;
+        if (month == 13 && (date.Month & 1) != 1)
+            return false;
+        if (month == 14 && (date.Month & 1) == 1)
+            return false;
+
+        if (date.Day != day && day != 255)
+            return false;
+        // day 32 todo
+
+        if (wday == 255)
+            return true;
+
+        if (wday == 7 && date.DayOfWeek == 0)  // Sunday 7 for Bacnet, 0 for .NET
+            return true;
+
+        if (wday == (int)date.DayOfWeek)
+            return true;
+
+        return false;
+    }
+
+    public DateTime toDateTime() // Not every time possible, too much complex (any month, any year ...)
+    {
+        try
+        {
+            return IsPeriodic
+                ? new DateTime(1, 1, 1)
+                : new DateTime(year + 1900, month, day);
+        }
+        catch
+        {
+            return DateTime.Now; // or anything else why not !
+        }
+    }
+
+    private static string GetDayName(int day)
+    {
+        if (day == 7)
+            day = 0;
+
+        return CultureInfo.CurrentCulture.DateTimeFormat.DayNames[day];
+    }
+
+    public override string ToString()
+    {
+        string ret;
+
+        if (wday != 255)
+            ret = GetDayName(wday) + " ";
+        else
+            ret = "";
+
+        if (day != 255)
+            ret = ret + day + "/";
+        else
+            ret += "**/";
+
+        switch (month)
+        {
+            case 13:
+                ret += "odd/";
+                break;
+            case 14:
+                ret += "even/";
+                break;
+            case 255:
+                ret += "**/";
+                break;
+            default:
+                ret = ret + month + "/";
+                break;
+        }
+
+
+        if (year != 255)
+            ret += year + 1900;
+        else
+            ret += "****";
+
+        return ret;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDateRange.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDateRange.cs
new file mode 100644
index 0000000..12238ed
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDateRange.cs
@@ -0,0 +1,53 @@
+namespace System.IO.BACnet;
+
+public struct BacnetDateRange : ASN1.IEncode, ASN1.IDecode
+{
+    public BacnetDate startDate;
+    public BacnetDate endDate;
+
+    public BacnetDateRange(BacnetDate start, BacnetDate end)
+    {
+        startDate = start;
+        endDate = end;
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        ASN1.encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE, false, 4);
+        startDate.Encode(buffer);
+        ASN1.encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE, false, 4);
+        endDate.Encode(buffer);
+    }
+
+    public int Decode(byte[] buffer, int offset, uint count)
+    {
+        var len = 1; // opening tag
+        len += startDate.Decode(buffer, offset + len, count);
+        len++;
+        len += endDate.Decode(buffer, offset + len, count);
+        return len;
+    }
+
+    public bool IsAFittingDate(DateTime date)
+    {
+        date = new DateTime(date.Year, date.Month, date.Day);
+        return date >= startDate.toDateTime() && date <= endDate.toDateTime();
+    }
+
+    public override string ToString()
+    {
+        string ret;
+
+        if (startDate.day != 255)
+            ret = "From " + startDate;
+        else
+            ret = "From **/**/**";
+
+        if (endDate.day != 255)
+            ret = ret + " to " + endDate;
+        else
+            ret += " to **/**/**";
+
+        return ret;
+    }
+};
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceObjectPropertyReference.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceObjectPropertyReference.cs
new file mode 100644
index 0000000..3803d06
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceObjectPropertyReference.cs
@@ -0,0 +1,104 @@
+namespace System.IO.BACnet;
+
+public struct BacnetDeviceObjectPropertyReference : ASN1.IEncode
+{
+    public BacnetObjectId objectIdentifier;
+    public BacnetPropertyIds propertyIdentifier;
+    public uint arrayIndex;
+    public BacnetObjectId deviceIndentifier;
+
+    public BacnetDeviceObjectPropertyReference(BacnetObjectId objectIdentifier, BacnetPropertyIds propertyIdentifier, BacnetObjectId? deviceIndentifier = null, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        this.objectIdentifier = objectIdentifier;
+        this.propertyIdentifier = propertyIdentifier;
+        this.arrayIndex = arrayIndex;
+        this.deviceIndentifier = deviceIndentifier ?? new BacnetObjectId(BacnetObjectTypes.MAX_BACNET_OBJECT_TYPE, 0);
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        ASN1.bacapp_encode_device_obj_property_ref(buffer, this);
+    }
+
+    public BacnetObjectId ObjectId
+    {
+        get => objectIdentifier;
+        set => objectIdentifier = value;
+    }
+
+    public int ArrayIndex // shows -1 when it's ASN1.BACNET_ARRAY_ALL
+    {
+        get => arrayIndex != ASN1.BACNET_ARRAY_ALL
+            ? (int)arrayIndex
+            : -1;
+        set => arrayIndex = value < 0
+            ? ASN1.BACNET_ARRAY_ALL
+            : (uint)value;
+    }
+
+    public BacnetObjectId? DeviceId  // shows null when it's not OBJECT_DEVICE
+    {
+        get
+        {
+            return deviceIndentifier.type == BacnetObjectTypes.OBJECT_DEVICE
+                ? (BacnetObjectId?)deviceIndentifier
+                : null;
+        }
+        set
+        {
+            deviceIndentifier = value ?? new BacnetObjectId();
+        }
+    }
+
+    public BacnetPropertyIds PropertyId
+    {
+        get => propertyIdentifier;
+        set => propertyIdentifier = value;
+    }
+
+    public static object Parse(string value)
+    {
+        var parts = value.Split(new[] { '.' }, StringSplitOptions.RemoveEmptyEntries);
+
+        BacnetObjectId? deviceId = null;
+        BacnetObjectId objectId;
+
+        switch (parts.Length)
+        {
+            case 2:
+                objectId = BacnetObjectId.Parse(parts[0]);
+                break;
+
+            case 3:
+                deviceId = BacnetObjectId.Parse(parts[0]);
+                objectId = BacnetObjectId.Parse(parts[1]);
+                break;
+
+            default:
+                throw new ArgumentException("Invalid format", nameof(value));
+        }
+
+        if (!Enum.TryParse(parts.Last(), out BacnetPropertyIds propertyId))
+        {
+            if (!uint.TryParse(parts.Last(), out var vendorSpecificPropertyId))
+                throw new ArgumentException("Invalid format of property id", nameof(value));
+
+            propertyId = (BacnetPropertyIds)vendorSpecificPropertyId;
+        }
+
+        return new BacnetDeviceObjectPropertyReference
+        {
+            DeviceId = deviceId,
+            ObjectId = objectId,
+            PropertyId = propertyId,
+            ArrayIndex = -1
+        };
+    }
+
+    public override string ToString()
+    {
+        return DeviceId != null
+            ? $"{DeviceId}.{ObjectId}.{PropertyId}"
+            : $"{ObjectId}.{PropertyId}";
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceStatus.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceStatus.cs
new file mode 100644
index 0000000..60f4627
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetDeviceStatus.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet;
+
+public enum BacnetDeviceStatus : byte
+{
+    OPERATIONAL = 0,
+    OPERATIONAL_READONLY = 1,
+    DOWNLOAD_REQUIRED = 2,
+    DOWNLOAD_IN_PROGRESS = 3,
+    NON_OPERATIONAL = 4,
+    BACKUP_IN_PROGRESS = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetError.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetError.cs
new file mode 100644
index 0000000..ef6d697
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetError.cs
@@ -0,0 +1,22 @@
+namespace System.IO.BACnet;
+
+public struct BacnetError
+{
+    public BacnetErrorClasses error_class;
+    public BacnetErrorCodes error_code;
+
+    public BacnetError(BacnetErrorClasses errorClass, BacnetErrorCodes errorCode)
+    {
+        error_class = errorClass;
+        error_code = errorCode;
+    }
+    public BacnetError(uint errorClass, uint errorCode)
+    {
+        error_class = (BacnetErrorClasses)errorClass;
+        error_code = (BacnetErrorCodes)errorCode;
+    }
+    public override string ToString()
+    {
+        return $"{error_class}: {error_code}";
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorClasses.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorClasses.cs
new file mode 100644
index 0000000..b5f08b2
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorClasses.cs
@@ -0,0 +1,21 @@
+namespace System.IO.BACnet;
+
+public enum BacnetErrorClasses
+{
+    ERROR_CLASS_DEVICE = 0,
+    ERROR_CLASS_OBJECT = 1,
+    ERROR_CLASS_PROPERTY = 2,
+    ERROR_CLASS_RESOURCES = 3,
+    ERROR_CLASS_SECURITY = 4,
+    ERROR_CLASS_SERVICES = 5,
+    ERROR_CLASS_VT = 6,
+    ERROR_CLASS_COMMUNICATION = 7,
+    /* Enumerated values 0-63 are reserved for definition by ASHRAE. */
+    /* Enumerated values 64-65535 may be used by others subject to */
+    /* the procedures and constraints described in Clause 23. */
+    MAX_BACNET_ERROR_CLASS = 8,
+    /* do the MAX here instead of outside of enum so that
+       compilers will allocate adequate sized datatype for enum */
+    ERROR_CLASS_PROPRIETARY_FIRST = 64,
+    ERROR_CLASS_PROPRIETARY_LAST = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorCodes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorCodes.cs
new file mode 100644
index 0000000..b99286c
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetErrorCodes.cs
@@ -0,0 +1,246 @@
+namespace System.IO.BACnet;
+
+// These are sorted in the order given in Clause 18.
+// ERROR, REJECT AND ABORT CODES The Class and Code pairings
+// are required to be used in accordance with Clause 18.
+public enum BacnetErrorCodes
+{
+    /* valid for all classes */
+    ERROR_CODE_OTHER = 0,
+
+    /* Error Class - Device */
+    ERROR_CODE_DEVICE_BUSY = 3,
+    ERROR_CODE_CONFIGURATION_IN_PROGRESS = 2,
+    ERROR_CODE_OPERATIONAL_PROBLEM = 25,
+
+    /* Error Class - Object */
+    ERROR_CODE_DYNAMIC_CREATION_NOT_SUPPORTED = 4,
+    ERROR_CODE_NO_OBJECTS_OF_SPECIFIED_TYPE = 17,
+    ERROR_CODE_OBJECT_DELETION_NOT_PERMITTED = 23,
+    ERROR_CODE_OBJECT_IDENTIFIER_ALREADY_EXISTS = 24,
+    ERROR_CODE_READ_ACCESS_DENIED = 27,
+    ERROR_CODE_UNKNOWN_OBJECT = 31,
+    ERROR_CODE_UNSUPPORTED_OBJECT_TYPE = 36,
+
+    /* Error Class - Property */
+    ERROR_CODE_CHARACTER_SET_NOT_SUPPORTED = 41,
+    ERROR_CODE_DATATYPE_NOT_SUPPORTED = 47,
+    ERROR_CODE_INCONSISTENT_SELECTION_CRITERION = 8,
+    ERROR_CODE_INVALID_ARRAY_INDEX = 42,
+    ERROR_CODE_INVALID_DATA_TYPE = 9,
+    ERROR_CODE_NOT_COV_PROPERTY = 44,
+    ERROR_CODE_OPTIONAL_FUNCTIONALITY_NOT_SUPPORTED = 45,
+    ERROR_CODE_PROPERTY_IS_NOT_AN_ARRAY = 50,
+    /* ERROR_CODE_READ_ACCESS_DENIED = 27, */
+    ERROR_CODE_UNKNOWN_PROPERTY = 32,
+    ERROR_CODE_VALUE_OUT_OF_RANGE = 37,
+    ERROR_CODE_WRITE_ACCESS_DENIED = 40,
+
+    /* Error Class - Resources */
+    ERROR_CODE_NO_SPACE_FOR_OBJECT = 18,
+    ERROR_CODE_NO_SPACE_TO_ADD_LIST_ELEMENT = 19,
+    ERROR_CODE_NO_SPACE_TO_WRITE_PROPERTY = 20,
+
+    /* Error Class - Security */
+    ERROR_CODE_AUTHENTICATION_FAILED = 1,
+    /* ERROR_CODE_CHARACTER_SET_NOT_SUPPORTED = 41, */
+    ERROR_CODE_INCOMPATIBLE_SECURITY_LEVELS = 6,
+    ERROR_CODE_INVALID_OPERATOR_NAME = 12,
+    ERROR_CODE_KEY_GENERATION_ERROR = 15,
+    ERROR_CODE_PASSWORD_FAILURE = 26,
+    ERROR_CODE_SECURITY_NOT_SUPPORTED = 28,
+    ERROR_CODE_TIMEOUT = 30,
+
+    /* Error Class - Services */
+    /* ERROR_CODE_CHARACTER_SET_NOT_SUPPORTED = 41, */
+    ERROR_CODE_COV_SUBSCRIPTION_FAILED = 43,
+    ERROR_CODE_DUPLICATE_NAME = 48,
+    ERROR_CODE_DUPLICATE_OBJECT_ID = 49,
+    ERROR_CODE_FILE_ACCESS_DENIED = 5,
+    ERROR_CODE_INCONSISTENT_PARAMETERS = 7,
+    ERROR_CODE_INVALID_CONFIGURATION_DATA = 46,
+    ERROR_CODE_INVALID_FILE_ACCESS_METHOD = 10,
+    ERROR_CODE_INVALID_FILE_START_POSITION = 11,
+    ERROR_CODE_INVALID_PARAMETER_DATA_TYPE = 13,
+    ERROR_CODE_INVALID_TIME_STAMP = 14,
+    ERROR_CODE_MISSING_REQUIRED_PARAMETER = 16,
+    /* ERROR_CODE_OPTIONAL_FUNCTIONALITY_NOT_SUPPORTED = 45, */
+    ERROR_CODE_PROPERTY_IS_NOT_A_LIST = 22,
+    ERROR_CODE_SERVICE_REQUEST_DENIED = 29,
+
+    /* Error Class - VT */
+    ERROR_CODE_UNKNOWN_VT_CLASS = 34,
+    ERROR_CODE_UNKNOWN_VT_SESSION = 35,
+    ERROR_CODE_NO_VT_SESSIONS_AVAILABLE = 21,
+    ERROR_CODE_VT_SESSION_ALREADY_CLOSED = 38,
+    ERROR_CODE_VT_SESSION_TERMINATION_FAILURE = 39,
+
+    /* unused */
+    ERROR_CODE_RESERVED1 = 33,
+    /* new error codes from new addenda */
+    ERROR_CODE_ABORT_BUFFER_OVERFLOW = 51,
+    ERROR_CODE_ABORT_INVALID_APDU_IN_THIS_STATE = 52,
+    ERROR_CODE_ABORT_PREEMPTED_BY_HIGHER_PRIORITY_TASK = 53,
+    ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED = 54,
+    ERROR_CODE_ABORT_PROPRIETARY = 55,
+    ERROR_CODE_ABORT_OTHER = 56,
+    ERROR_CODE_INVALID_TAG = 57,
+    ERROR_CODE_NETWORK_DOWN = 58,
+    ERROR_CODE_REJECT_BUFFER_OVERFLOW = 59,
+    ERROR_CODE_REJECT_INCONSISTENT_PARAMETERS = 60,
+    ERROR_CODE_REJECT_INVALID_PARAMETER_DATA_TYPE = 61,
+    ERROR_CODE_REJECT_INVALID_TAG = 62,
+    ERROR_CODE_REJECT_MISSING_REQUIRED_PARAMETER = 63,
+    ERROR_CODE_REJECT_PARAMETER_OUT_OF_RANGE = 64,
+    ERROR_CODE_REJECT_TOO_MANY_ARGUMENTS = 65,
+    ERROR_CODE_REJECT_UNDEFINED_ENUMERATION = 66,
+    ERROR_CODE_REJECT_UNRECOGNIZED_SERVICE = 67,
+    ERROR_CODE_REJECT_PROPRIETARY = 68,
+    ERROR_CODE_REJECT_OTHER = 69,
+    ERROR_CODE_UNKNOWN_DEVICE = 70,
+    ERROR_CODE_UNKNOWN_ROUTE = 71,
+    ERROR_CODE_VALUE_NOT_INITIALIZED = 72,
+    ERROR_CODE_INVALID_EVENT_STATE = 73,
+    ERROR_CODE_NO_ALARM_CONFIGURED = 74,
+    ERROR_CODE_LOG_BUFFER_FULL = 75,
+    ERROR_CODE_LOGGED_VALUE_PURGED = 76,
+    ERROR_CODE_NO_PROPERTY_SPECIFIED = 77,
+    ERROR_CODE_NOT_CONFIGURED_FOR_TRIGGERED_LOGGING = 78,
+    ERROR_CODE_UNKNOWN_SUBSCRIPTION = 79,
+    ERROR_CODE_PARAMETER_OUT_OF_RANGE = 80,
+    ERROR_CODE_LIST_ELEMENT_NOT_FOUND = 81,
+    ERROR_CODE_BUSY = 82,
+    ERROR_CODE_COMMUNICATION_DISABLED = 83,
+    ERROR_CODE_SUCCESS = 84,
+    ERROR_CODE_ACCESS_DENIED = 85,
+    ERROR_CODE_BAD_DESTINATION_ADDRESS = 86,
+    ERROR_CODE_BAD_DESTINATION_DEVICE_ID = 87,
+    ERROR_CODE_BAD_SIGNATURE = 88,
+    ERROR_CODE_BAD_SOURCE_ADDRESS = 89,
+    ERROR_CODE_BAD_TIMESTAMP = 90,
+    ERROR_CODE_CANNOT_USE_KEY = 91,
+    ERROR_CODE_CANNOT_VERIFY_MESSAGE_ID = 92,
+    ERROR_CODE_CORRECT_KEY_REVISION = 93,
+    ERROR_CODE_DESTINATION_DEVICE_ID_REQUIRED = 94,
+    ERROR_CODE_DUPLICATE_MESSAGE = 95,
+    ERROR_CODE_ENCRYPTION_NOT_CONFIGURED = 96,
+    ERROR_CODE_ENCRYPTION_REQUIRED = 97,
+    ERROR_CODE_INCORRECT_KEY = 98,
+    ERROR_CODE_INVALID_KEY_DATA = 99,
+    ERROR_CODE_KEY_UPDATE_IN_PROGRESS = 100,
+    ERROR_CODE_MALFORMED_MESSAGE = 101,
+    ERROR_CODE_NOT_KEY_SERVER = 102,
+    ERROR_CODE_SECURITY_NOT_CONFIGURED = 103,
+    ERROR_CODE_SOURCE_SECURITY_REQUIRED = 104,
+    ERROR_CODE_TOO_MANY_KEYS = 105,
+    ERROR_CODE_UNKNOWN_AUTHENTICATION_TYPE = 106,
+    ERROR_CODE_UNKNOWN_KEY = 107,
+    ERROR_CODE_UNKNOWN_KEY_REVISION = 108,
+    ERROR_CODE_UNKNOWN_SOURCE_MESSAGE = 109,
+    ERROR_CODE_NOT_ROUTER_TO_DNET = 110,
+    ERROR_CODE_ROUTER_BUSY = 111,
+    ERROR_CODE_UNKNOWN_NETWORK_MESSAGE = 112,
+    ERROR_CODE_MESSAGE_TOO_LONG = 113,
+    ERROR_CODE_SECURITY_ERROR = 114,
+    ERROR_CODE_ADDRESSING_ERROR = 115,
+    ERROR_CODE_WRITE_BDT_FAILED = 116,
+    ERROR_CODE_READ_BDT_FAILED = 117,
+    ERROR_CODE_REGISTER_FOREIGN_DEVICE_FAILED = 118,
+    ERROR_CODE_READ_FDT_FAILED = 119,
+    ERROR_CODE_DELETE_FDT_ENTRY_FAILED = 120,
+    ERROR_CODE_DISTRIBUTE_BROADCAST_FAILED = 121,
+    ERROR_CODE_UNKNOWN_FILE_SIZE = 122,
+    ERROR_CODE_ABORT_APDU_TOO_LONG = 123,
+    ERROR_CODE_ABORT_APPLICATION_EXCEEDED_REPLY_TIME = 124,
+    ERROR_CODE_ABORT_OUT_OF_RESOURCES = 125,
+    ERROR_CODE_ABORT_TSM_TIMEOUT = 126,
+    ERROR_CODE_ABORT_WINDOW_SIZE_OUT_OF_RANGE = 127,
+    ERROR_CODE_FILE_FULL = 128,
+    ERROR_CODE_INCONSISTENT_CONFIGURATION = 129,
+    ERROR_CODE_INCONSISTENT_OBJECT_TYPE = 130,
+    ERROR_CODE_INTERNAL_ERROR = 131,
+    ERROR_CODE_NOT_CONFIGURED = 132,
+    ERROR_CODE_OUT_OF_MEMORY = 133,
+    ERROR_CODE_VALUE_TOO_LONG = 134,
+    ERROR_CODE_ABORT_INSUFFICIENT_SECURITY = 135,
+    ERROR_CODE_ABORT_SECURITY_ERROR = 136,
+    ERROR_CODE_DUPLICATE_ENTRY = 137,
+    ERROR_CODE_INVALID_VALUE_IN_THIS_STATE = 138,
+    ERROR_CODE_INVALID_OPERATION_IN_THIS_STATE = 139,
+    ERROR_CODE_LIST_ITEM_NOT_NUMBERED = 140,
+    ERROR_CODE_LIST_ITEM_NOT_TIMESTAMPED = 141,
+    ERROR_CODE_INVALID_DATA_ENCODING = 142,
+    ERROR_CODE_BVLC_FUNCTION_UNKNOWN = 143,
+    ERROR_CODE_BVLC_PROPRIETARY_FUNCTION_UNKNOWN = 144,
+    ERROR_CODE_HEADER_ENCODING_ERROR = 145,
+    ERROR_CODE_HEADER_NOT_UNDERSTOOD = 146,
+    ERROR_CODE_MESSAGE_INCOMPLETE = 147,
+    ERROR_CODE_NOT_A_BACNET_SC_HUB = 148,
+    ERROR_CODE_PAYLOAD_EXPECTED = 149,
+    ERROR_CODE_UNEXPECTED_DATA = 150,
+    ERROR_CODE_NODE_DUPLICATE_VMAC = 151,
+    ERROR_CODE_HTTP_UNEXPECTED_RESPONSE_CODE = 152,
+    ERROR_CODE_HTTP_NO_UPGRADE = 153,
+    ERROR_CODE_HTTP_RESOURCE_NOT_LOCAL = 154,
+    ERROR_CODE_HTTP_PROXY_AUTHENTICATION_FAILED = 155,
+    ERROR_CODE_HTTP_RESPONSE_TIMEOUT = 156,
+    ERROR_CODE_HTTP_RESPONSE_SYNTAX_ERROR = 157,
+    ERROR_CODE_HTTP_RESPONSE_VALUE_ERROR = 158,
+    ERROR_CODE_HTTP_RESPONSE_MISSING_HEADER = 159,
+    ERROR_CODE_HTTP_WEBSOCKET_HEADER_ERROR = 160,
+    ERROR_CODE_HTTP_UPGRADE_REQUIRED = 161,
+    ERROR_CODE_HTTP_UPGRADE_ERROR = 162,
+    ERROR_CODE_HTTP_TEMPORARY_UNAVAILABLE = 163,
+    ERROR_CODE_HTTP_NOT_A_SERVER = 164,
+    ERROR_CODE_HTTP_ERROR = 165,
+    ERROR_CODE_WEBSOCKET_SCHEME_NOT_SUPPORTED = 166,
+    ERROR_CODE_WEBSOCKET_UNKNOWN_CONTROL_MESSAGE = 167,
+    ERROR_CODE_WEBSOCKET_CLOSE_ERROR = 168,
+    ERROR_CODE_WEBSOCKET_CLOSED_BY_PEER = 169,
+    ERROR_CODE_WEBSOCKET_ENDPOINT_LEAVES = 170,
+    ERROR_CODE_WEBSOCKET_PROTOCOL_ERROR = 171,
+    ERROR_CODE_WEBSOCKET_DATA_NOT_ACCEPTED = 172,
+    ERROR_CODE_WEBSOCKET_CLOSED_ABNORMALLY = 173,
+    ERROR_CODE_WEBSOCKET_DATA_INCONSISTENT = 174,
+    ERROR_CODE_WEBSOCKET_DATA_AGAINST_POLICY = 175,
+    ERROR_CODE_WEBSOCKET_FRAME_TOO_LONG = 176,
+    ERROR_CODE_WEBSOCKET_EXTENSION_MISSING = 177,
+    ERROR_CODE_WEBSOCKET_REQUEST_UNAVAILABLE = 178,
+    ERROR_CODE_WEBSOCKET_ERROR = 179,
+    ERROR_CODE_TLS_CLIENT_CERTIFICATE_ERROR = 180,
+    ERROR_CODE_TLS_SERVER_CERTIFICATE_ERROR = 181,
+    ERROR_CODE_TLS_CLIENT_AUTHENTICATION_FAILED = 182,
+    ERROR_CODE_TLS_SERVER_AUTHENTICATION_FAILED = 183,
+    ERROR_CODE_TLS_CLIENT_CERTIFICATE_EXPIRED = 184,
+    ERROR_CODE_TLS_SERVER_CERTIFICATE_EXPIRED = 185,
+    ERROR_CODE_TLS_CLIENT_CERTIFICATE_REVOKED = 186,
+    ERROR_CODE_TLS_SERVER_CERTIFICATE_REVOKED = 187,
+    ERROR_CODE_TLS_ERROR = 188,
+    ERROR_CODE_DNS_UNAVAILABLE = 189,
+    ERROR_CODE_DNS_NAME_RESOLUTION_FAILED = 190,
+    ERROR_CODE_DNS_RESOLVER_FAILURE = 191,
+    ERROR_CODE_DNS_ERROR = 192,
+    ERROR_CODE_TCP_CONNECT_TIMEOUT = 193,
+    ERROR_CODE_TCP_CONNECTION_REFUSED = 194,
+    ERROR_CODE_TCP_CLOSED_BY_LOCAL = 195,
+    ERROR_CODE_TCP_CLOSED_OTHER = 196,
+    ERROR_CODE_TCP_ERROR = 197,
+    ERROR_CODE_IP_ADDRESS_NOT_REACHABLE = 198,
+    ERROR_CODE_IP_ERROR = 199,
+    ERROR_CODE_CERTIFICATE_EXPIRED = 200,
+    ERROR_CODE_CERTIFICATE_INVALID = 201,
+    ERROR_CODE_CERTIFICATE_MALFORMED = 202,
+    ERROR_CODE_CERTIFICATE_REVOKED = 203,
+    ERROR_CODE_UNKNOWN_SECURITY_KEY = 204,
+    ERROR_CODE_REFERENCED_PORT_IN_ERROR = 205,
+    MAX_BACNET_ERROR_CODE = 206,
+    ERROR_CODE_RESERVED_MAX = 255,
+    /* Enumerated values 0-255 are reserved for definition by ASHRAE. */
+    /* Enumerated values 256-65535 may be used by others subject to */
+    /* the procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    ERROR_CODE_PROPRIETARY_FIRST = 256,
+    ERROR_CODE_PROPRIETARY_LAST = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetEventNotificationData.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetEventNotificationData.cs
new file mode 100644
index 0000000..abda801
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetEventNotificationData.cs
@@ -0,0 +1,140 @@
+namespace System.IO.BACnet;
+
+public struct BacnetEventNotificationData
+{
+    public uint processIdentifier;
+    public BacnetObjectId initiatingObjectIdentifier;
+    public BacnetObjectId eventObjectIdentifier;
+    public BacnetGenericTime timeStamp;
+    public uint notificationClass;
+    public byte priority;
+    public BacnetEventTypes eventType;
+    public string messageText;       /* OPTIONAL - Set to NULL if not being used */
+    public BacnetNotifyTypes notifyType;
+    public bool ackRequired;
+    public BacnetEventStates fromState;
+    public BacnetEventStates toState;
+
+    /*
+     ** Each of these structures in the union maps to a particular eventtype
+     ** Based on BACnetNotificationParameters
+     */
+
+    /*
+     ** EVENT_CHANGE_OF_BITSTRING
+     */
+    public BacnetBitString changeOfBitstring_referencedBitString;
+    public BacnetBitString changeOfBitstring_statusFlags;
+    /*
+     ** EVENT_CHANGE_OF_STATE
+     */
+    public BacnetPropertyState changeOfState_newState;
+    public BacnetBitString changeOfState_statusFlags;
+    /*
+     ** EVENT_CHANGE_OF_VALUE
+     */
+    public BacnetBitString changeOfValue_changedBits;
+    public float changeOfValue_changeValue;
+    public BacnetCOVTypes? changeOfValue_tag;
+    public BacnetBitString changeOfValue_statusFlags;
+    /*
+     ** EVENT_COMMAND_FAILURE
+     */
+    public uint commandFailure_commandValue;
+    public BacnetBitString commandFailure_statusFlags;
+    public uint commandFailure_feedbackValue;
+    /*
+     ** EVENT_FLOATING_LIMIT
+     */
+    public float floatingLimit_referenceValue;
+    public BacnetBitString floatingLimit_statusFlags;
+    public float floatingLimit_setPointValue;
+    public float floatingLimit_errorLimit;
+    /*
+     ** EVENT_OUT_OF_RANGE
+     */
+    public float outOfRange_exceedingValue;
+    public BacnetBitString outOfRange_statusFlags;
+    public float outOfRange_deadband;
+    public float outOfRange_exceededLimit;
+    /*
+     ** EVENT_CHANGE_OF_LIFE_SAFETY
+     */
+    public BacnetLifeSafetyStates? changeOfLifeSafety_newState;
+    public BacnetLifeSafetyModes? changeOfLifeSafety_newMode;
+    public BacnetBitString changeOfLifeSafety_statusFlags;
+    public BacnetLifeSafetyOperations? changeOfLifeSafety_operationExpected;
+    /*
+     ** EVENT_EXTENDED
+     **
+     ** Not Supported!
+     */
+    /*
+     ** EVENT_BUFFER_READY
+     */
+    public BacnetDeviceObjectPropertyReference bufferReady_bufferProperty;
+    public uint bufferReady_previousNotification;
+    public uint bufferReady_currentNotification;
+    /*
+     ** EVENT_UNSIGNED_RANGE
+     */
+    public uint unsignedRange_exceedingValue;
+    public BacnetBitString unsignedRange_statusFlags;
+    public uint unsignedRange_exceededLimit;
+    /*
+     ** EVENT_EXTENDED
+     */
+    public uint extended_vendorId;
+    public uint extended_eventType;
+    public object[] extended_parameters;
+
+    public override string ToString()
+    {
+        return $"initiatingObject: {initiatingObjectIdentifier}, eventObject: {eventObjectIdentifier}, "
+             + $"eventType: {eventType}, notifyType: {notifyType}, timeStamp: {timeStamp}, "
+             + $"fromState: {fromState}, toState: {toState}, {GetEventDetails() ?? "no details"}";
+    }
+
+    private string GetEventDetails()
+    {
+        switch (eventType)
+        {
+            case BacnetEventTypes.EVENT_CHANGE_OF_BITSTRING:
+                return $"referencedBitString: {changeOfBitstring_referencedBitString}, statusFlags: {changeOfBitstring_statusFlags}";
+
+            case BacnetEventTypes.EVENT_CHANGE_OF_STATE:
+                return $"newState: {changeOfState_newState}, statusFlags: {changeOfState_statusFlags}";
+
+            case BacnetEventTypes.EVENT_CHANGE_OF_VALUE:
+                return $"changedBits: {changeOfValue_changedBits}, changeValue: {changeOfValue_changeValue}, "
+                       + $"tag: {changeOfValue_tag}, statusFlags: {changeOfValue_statusFlags}";
+
+            case BacnetEventTypes.EVENT_FLOATING_LIMIT:
+                return $"referenceValue: {floatingLimit_referenceValue}, statusFlags: {floatingLimit_statusFlags}, "
+                       + $"setPointValue: {floatingLimit_setPointValue}, errorLimit: {floatingLimit_errorLimit}";
+
+            case BacnetEventTypes.EVENT_OUT_OF_RANGE:
+                return $"exceedingValue: {outOfRange_exceedingValue}, statusFlags: {outOfRange_statusFlags}, "
+                       + $"deadband: {outOfRange_deadband}, exceededLimit: {outOfRange_exceededLimit}";
+
+            case BacnetEventTypes.EVENT_CHANGE_OF_LIFE_SAFETY:
+                return $"newState: {changeOfLifeSafety_newState}, newMode: {changeOfLifeSafety_newMode}, "
+                       +
+                       $"statusFlags: {changeOfLifeSafety_statusFlags}, operationExpected: {changeOfLifeSafety_operationExpected}";
+
+            case BacnetEventTypes.EVENT_BUFFER_READY:
+                return $"bufferProperty: {bufferReady_bufferProperty}, previousNotification: {bufferReady_previousNotification}, "
+                       + $"currentNotification: {bufferReady_currentNotification}";
+
+            case BacnetEventTypes.EVENT_UNSIGNED_RANGE:
+                return $"exceedingValue: {unsignedRange_exceedingValue}, statusFlags: {unsignedRange_statusFlags}, "
+                       + $"exceededLimit: {unsignedRange_exceededLimit}";
+
+            case BacnetEventTypes.EVENT_EXTENDED:
+                return $"vendorId: {extended_vendorId}, extendedEventType: {extended_eventType}, parameters: [{extended_parameters?.Length ?? 0}]";
+
+            default:
+                return null;
+        }
+    }
+};
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGenericTime.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGenericTime.cs
new file mode 100644
index 0000000..1214a1a
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGenericTime.cs
@@ -0,0 +1,20 @@
+namespace System.IO.BACnet;
+
+public struct BacnetGenericTime
+{
+    public BacnetTimestampTags Tag;
+    public DateTime Time;
+    public ushort Sequence;
+
+    public BacnetGenericTime(DateTime time, BacnetTimestampTags tag, ushort sequence = 0)
+    {
+        Time = time;
+        Tag = tag;
+        Sequence = sequence;
+    }
+
+    public override string ToString()
+    {
+        return $"{Time}";
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGetEventInformationData.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGetEventInformationData.cs
new file mode 100644
index 0000000..7b01a63
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetGetEventInformationData.cs
@@ -0,0 +1,12 @@
+namespace System.IO.BACnet;
+
+public struct BacnetGetEventInformationData
+{
+    public BacnetObjectId objectIdentifier;
+    public BacnetEventStates eventState;
+    public BacnetBitString acknowledgedTransitions;
+    public BacnetGenericTime[] eventTimeStamps;    //3
+    public BacnetNotifyTypes notifyType;
+    public BacnetBitString eventEnable;
+    public uint[] eventPriorities;     //3
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetLogRecord.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetLogRecord.cs
new file mode 100644
index 0000000..2750977
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetLogRecord.cs
@@ -0,0 +1,143 @@
+namespace System.IO.BACnet;
+
+public struct BacnetLogRecord
+{
+    public DateTime timestamp;
+
+    /* logDatum: CHOICE { */
+    public BacnetTrendLogValueType type;
+    //private BacnetBitString log_status;
+    //private bool boolean_value;
+    //private float real_value;
+    //private uint enum_value;
+    //private uint unsigned_value;
+    //private int signed_value;
+    //private BacnetBitString bitstring_value;
+    //private bool null_value;
+    //private BacnetError failure;
+    //private float time_change;
+    private object any_value;
+    /* } */
+
+    public BacnetBitString statusFlags;
+
+    public BacnetLogRecord(BacnetTrendLogValueType type, object value, DateTime stamp, uint status)
+    {
+        this.type = type;
+        timestamp = stamp;
+        statusFlags = BacnetBitString.ConvertFromInt(status);
+        any_value = null;
+        Value = value;
+    }
+
+    public object Value
+    {
+        get
+        {
+            switch (type)
+            {
+                case BacnetTrendLogValueType.TL_TYPE_ANY:
+                    return any_value;
+                case BacnetTrendLogValueType.TL_TYPE_BITS:
+                    return (BacnetBitString)Convert.ChangeType(any_value, typeof(BacnetBitString));
+                case BacnetTrendLogValueType.TL_TYPE_BOOL:
+                    return (bool)Convert.ChangeType(any_value, typeof(bool));
+                case BacnetTrendLogValueType.TL_TYPE_DELTA:
+                    return (float)Convert.ChangeType(any_value, typeof(float));
+                case BacnetTrendLogValueType.TL_TYPE_ENUM:
+                    return (uint)Convert.ChangeType(any_value, typeof(uint));
+                case BacnetTrendLogValueType.TL_TYPE_ERROR:
+                    if (any_value != null)
+                        return (BacnetError)Convert.ChangeType(any_value, typeof(BacnetError));
+                    else
+                        return new BacnetError(BacnetErrorClasses.ERROR_CLASS_DEVICE, BacnetErrorCodes.ERROR_CODE_ABORT_OTHER);
+                case BacnetTrendLogValueType.TL_TYPE_NULL:
+                    return null;
+                case BacnetTrendLogValueType.TL_TYPE_REAL:
+                    return (float)Convert.ChangeType(any_value, typeof(float));
+                case BacnetTrendLogValueType.TL_TYPE_SIGN:
+                    return (int)Convert.ChangeType(any_value, typeof(int));
+                case BacnetTrendLogValueType.TL_TYPE_STATUS:
+                    return (BacnetBitString)Convert.ChangeType(any_value, typeof(BacnetBitString));
+                case BacnetTrendLogValueType.TL_TYPE_UNSIGN:
+                    return (uint)Convert.ChangeType(any_value, typeof(uint));
+                default:
+                    throw new NotSupportedException();
+            }
+        }
+        set
+        {
+            switch (type)
+            {
+                case BacnetTrendLogValueType.TL_TYPE_ANY:
+                    any_value = value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_BITS:
+                    if (value == null) value = new BacnetBitString();
+                    if (value.GetType() != typeof(BacnetBitString))
+                        value = BacnetBitString.ConvertFromInt((uint)Convert.ChangeType(value, typeof(uint)));
+                    any_value = (BacnetBitString)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_BOOL:
+                    if (value == null) value = false;
+                    if (value.GetType() != typeof(bool))
+                        value = (bool)Convert.ChangeType(value, typeof(bool));
+                    any_value = (bool)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_DELTA:
+                    if (value == null) value = (float)0;
+                    if (value.GetType() != typeof(float))
+                        value = (float)Convert.ChangeType(value, typeof(float));
+                    any_value = (float)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_ENUM:
+                    if (value == null) value = (uint)0;
+                    if (value.GetType() != typeof(uint))
+                        value = (uint)Convert.ChangeType(value, typeof(uint));
+                    any_value = (uint)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_ERROR:
+                    if (value == null) value = new BacnetError();
+                    if (value.GetType() != typeof(BacnetError))
+                        throw new ArgumentException();
+                    any_value = (BacnetError)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_NULL:
+                    if (value != null) throw new ArgumentException();
+                    any_value = value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_REAL:
+                    if (value == null) value = (float)0;
+                    if (value.GetType() != typeof(float))
+                        value = (float)Convert.ChangeType(value, typeof(float));
+                    any_value = (float)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_SIGN:
+                    if (value == null) value = 0;
+                    if (value.GetType() != typeof(int))
+                        value = (int)Convert.ChangeType(value, typeof(int));
+                    any_value = (int)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_STATUS:
+                    if (value == null) value = new BacnetBitString();
+                    if (value.GetType() != typeof(BacnetBitString))
+                        value = BacnetBitString.ConvertFromInt((uint)Convert.ChangeType(value, typeof(uint)));
+                    any_value = (BacnetBitString)value;
+                    break;
+                case BacnetTrendLogValueType.TL_TYPE_UNSIGN:
+                    if (value == null) value = (uint)0;
+                    if (value.GetType() != typeof(uint))
+                        value = (uint)Convert.ChangeType(value, typeof(uint));
+                    any_value = (uint)value;
+                    break;
+                default:
+                    throw new NotSupportedException();
+            }
+        }
+    }
+
+    public T GetValue<T>()
+    {
+        return (T)Convert.ChangeType(Value, typeof(T));
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxAdpu.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxAdpu.cs
new file mode 100644
index 0000000..21a1cd0
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxAdpu.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet;
+
+public enum BacnetMaxAdpu : byte
+{
+    MAX_APDU50 = 0,
+    MAX_APDU128 = 1,
+    MAX_APDU206 = 2,
+    MAX_APDU480 = 3,
+    MAX_APDU1024 = 4,
+    MAX_APDU1476 = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxSegments.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxSegments.cs
new file mode 100644
index 0000000..f00f72b
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMaxSegments.cs
@@ -0,0 +1,13 @@
+namespace System.IO.BACnet;
+
+public enum BacnetMaxSegments : byte
+{
+    MAX_SEG0 = 0,
+    MAX_SEG2 = 0x10,
+    MAX_SEG4 = 0x20,
+    MAX_SEG8 = 0x30,
+    MAX_SEG16 = 0x40,
+    MAX_SEG32 = 0x50,
+    MAX_SEG64 = 0x60,
+    MAX_SEG65 = 0x70
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMstpFrameTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMstpFrameTypes.cs
new file mode 100644
index 0000000..be5b24f
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetMstpFrameTypes.cs
@@ -0,0 +1,23 @@
+namespace System.IO.BACnet;
+
+/* MS/TP Frame Type */
+public enum BacnetMstpFrameTypes : byte
+{
+    /* Frame Types 8 through 127 are reserved by ASHRAE. */
+    FRAME_TYPE_TOKEN = 0,
+    FRAME_TYPE_POLL_FOR_MASTER = 1,
+    FRAME_TYPE_REPLY_TO_POLL_FOR_MASTER = 2,
+    FRAME_TYPE_TEST_REQUEST = 3,
+    FRAME_TYPE_TEST_RESPONSE = 4,
+    FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY = 5,
+    FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY = 6,
+    FRAME_TYPE_REPLY_POSTPONED = 7,
+    /* Frame Types 128 through 255: Proprietary Frames */
+    /* These frames are available to vendors as proprietary (non-BACnet) frames. */
+    /* The first two octets of the Data field shall specify the unique vendor */
+    /* identification code, most significant octet first, for the type of */
+    /* vendor-proprietary frame to be conveyed. The length of the data portion */
+    /* of a Proprietary frame shall be in the range of 2 to 501 octets. */
+    FRAME_TYPE_PROPRIETARY_MIN = 128,
+    FRAME_TYPE_PROPRIETARY_MAX = 255
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNetworkMessageTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNetworkMessageTypes.cs
new file mode 100644
index 0000000..8577ebe
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNetworkMessageTypes.cs
@@ -0,0 +1,31 @@
+namespace System.IO.BACnet;
+
+/*Network Layer Message Type */
+/*If Bit 7 of the control octet described in 6.2.2 is 1, */
+/* a message type octet shall be present as shown in Figure 6-1. */
+/* The following message types are indicated: */
+public enum BacnetNetworkMessageTypes : byte
+{
+    NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK = 0,
+    NETWORK_MESSAGE_I_AM_ROUTER_TO_NETWORK = 1,
+    NETWORK_MESSAGE_I_COULD_BE_ROUTER_TO_NETWORK = 2,
+    NETWORK_MESSAGE_REJECT_MESSAGE_TO_NETWORK = 3,
+    NETWORK_MESSAGE_ROUTER_BUSY_TO_NETWORK = 4,
+    NETWORK_MESSAGE_ROUTER_AVAILABLE_TO_NETWORK = 5,
+    NETWORK_MESSAGE_INIT_RT_TABLE = 6,
+    NETWORK_MESSAGE_INIT_RT_TABLE_ACK = 7,
+    NETWORK_MESSAGE_ESTABLISH_CONNECTION_TO_NETWORK = 8,
+    NETWORK_MESSAGE_DISCONNECT_CONNECTION_TO_NETWORK = 9,
+    NETWORK_MESSAGE_CHALLENGE_REQUEST = 10,
+    NETWORK_MESSAGE_SECURITY_PAYLOAD = 11,
+    NETWORK_MESSAGE_SECURITY_RESPONSE = 12,
+    NETWORK_MESSAGE_REQUEST_KEY_UPDATE = 13,
+    NETWORK_MESSAGE_UPDATE_KEY_SET = 14,
+    NETWORK_MESSAGE_UPDATE_DISTRIBUTION_KEY = 15,
+    NETWORK_MESSAGE_REQUEST_MASTER_KEY = 16,
+    NETWORK_MESSAGE_SET_MASTER_KEY = 17,
+    NETWORK_MESSAGE_WHAT_IS_NETWORK_NUMBER = 18,
+    NETWORK_MESSAGE_NETWORK_NUMBER_IS = 19
+    /* X'0A' to X'7F': Reserved for use by ASHRAE, */
+    /* X'80' to X'FF': Available for vendor proprietary messages */
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNodeTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNodeTypes.cs
new file mode 100644
index 0000000..a6c493f
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNodeTypes.cs
@@ -0,0 +1,17 @@
+namespace System.IO.BACnet;
+
+public enum BacnetNodeTypes
+{
+    NT_UNKNOWN,
+    NT_SYSTEM,
+    NT_NETWORK,
+    NT_DEVICE,
+    NT_ORGANIZATIONAL,
+    NT_AREA,
+    NT_EQUIPMENT,
+    NT_POINT,
+    NT_COLLECTION,
+    NT_PROPERTY,
+    NT_FUNCTIONAL,
+    NT_OTHER,
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNpduControls.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNpduControls.cs
new file mode 100644
index 0000000..0fda2ff
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetNpduControls.cs
@@ -0,0 +1,14 @@
+namespace System.IO.BACnet;
+
+[Flags]
+public enum BacnetNpduControls : byte
+{
+    PriorityNormalMessage = 0,
+    PriorityUrgentMessage = 1,
+    PriorityCriticalMessage = 2,
+    PriorityLifeSafetyMessage = 3,
+    ExpectingReply = 4,
+    SourceSpecified = 8,
+    DestinationSpecified = 32,
+    NetworkLayerMessage = 128
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectDescription.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectDescription.cs
new file mode 100644
index 0000000..688070f
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectDescription.cs
@@ -0,0 +1,7 @@
+namespace System.IO.BACnet;
+
+public struct BacnetObjectDescription
+{
+    public BacnetObjectTypes typeId;
+    public List<BacnetPropertyIds> propsId;
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectId.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectId.cs
new file mode 100644
index 0000000..830ed00
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectId.cs
@@ -0,0 +1,82 @@
+namespace System.IO.BACnet;
+
+[Serializable]
+public struct BacnetObjectId : IComparable<BacnetObjectId>
+{
+    public BacnetObjectTypes type;
+    public uint instance;
+
+    public BacnetObjectTypes Type
+    {
+        get => type;
+        set => type = value;
+    }
+
+    public uint Instance
+    {
+        get => instance;
+        set => instance = value;
+    }
+
+    public BacnetObjectId(BacnetObjectTypes type, uint instance)
+    {
+        this.type = type;
+        this.instance = instance;
+    }
+
+    public override string ToString()
+    {
+        return $"{Type}:{Instance}";
+    }
+
+    public override int GetHashCode()
+    {
+        return ToString().GetHashCode();
+    }
+
+    public override bool Equals(object obj)
+    {
+        return obj != null && obj.ToString().Equals(ToString());
+    }
+
+    public int CompareTo(BacnetObjectId other)
+    {
+        if (Type == other.Type)
+            return Instance.CompareTo(other.Instance);
+
+        if (Type == BacnetObjectTypes.OBJECT_DEVICE)
+            return -1;
+
+        if (other.Type == BacnetObjectTypes.OBJECT_DEVICE)
+            return 1;
+
+        // cast to int for comparison otherwise unpredictable behaviour with outbound enum (proprietary type)
+        return ((int)Type).CompareTo((int)other.Type);
+    }
+
+    public static bool operator ==(BacnetObjectId a, BacnetObjectId b)
+    {
+        return a.Equals(b);
+    }
+
+    public static bool operator !=(BacnetObjectId a, BacnetObjectId b)
+    {
+        return !(a == b);
+    }
+
+    public static BacnetObjectId Parse(string value)
+    {
+        var pattern = new Regex($"(?<{nameof(Type)}>.+):(?<{nameof(Instance)}>.+)");
+
+        if (string.IsNullOrEmpty(value) || !pattern.IsMatch(value))
+            return new BacnetObjectId();
+
+        var objectType = (BacnetObjectTypes)Enum.Parse(typeof(BacnetObjectTypes),
+            pattern.Match(value).Groups[nameof(Type)].Value);
+
+        var objectInstance = uint.Parse(pattern.Match(value).Groups[nameof(Instance)].Value);
+
+        return new BacnetObjectId(objectType, objectInstance);
+    }
+
+};
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectTypes.cs
new file mode 100644
index 0000000..1cbb8bb
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetObjectTypes.cs
@@ -0,0 +1,82 @@
+namespace System.IO.BACnet;
+
+public enum BacnetObjectTypes : uint
+{
+    OBJECT_ANALOG_INPUT = 0,
+    OBJECT_ANALOG_OUTPUT = 1,
+    OBJECT_ANALOG_VALUE = 2,
+    OBJECT_BINARY_INPUT = 3,
+    OBJECT_BINARY_OUTPUT = 4,
+    OBJECT_BINARY_VALUE = 5,
+    OBJECT_CALENDAR = 6,
+    OBJECT_COMMAND = 7,
+    OBJECT_DEVICE = 8,
+    OBJECT_EVENT_ENROLLMENT = 9,
+    OBJECT_FILE = 10,
+    OBJECT_GROUP = 11,
+    OBJECT_LOOP = 12,
+    OBJECT_MULTI_STATE_INPUT = 13,
+    OBJECT_MULTI_STATE_OUTPUT = 14,
+    OBJECT_NOTIFICATION_CLASS = 15,
+    OBJECT_PROGRAM = 16,
+    OBJECT_SCHEDULE = 17,
+    OBJECT_AVERAGING = 18,
+    OBJECT_MULTI_STATE_VALUE = 19,
+    OBJECT_TRENDLOG = 20,
+    OBJECT_LIFE_SAFETY_POINT = 21,
+    OBJECT_LIFE_SAFETY_ZONE = 22,
+    OBJECT_ACCUMULATOR = 23,
+    OBJECT_PULSE_CONVERTER = 24,
+    OBJECT_EVENT_LOG = 25,
+    OBJECT_GLOBAL_GROUP = 26,
+    OBJECT_TREND_LOG_MULTIPLE = 27,
+    OBJECT_LOAD_CONTROL = 28,
+    OBJECT_STRUCTURED_VIEW = 29,
+    OBJECT_ACCESS_DOOR = 30,
+    OBJECT_TIMER = 31,                  /* Addendum 135-2012ay */
+    OBJECT_ACCESS_CREDENTIAL = 32,      /* Addendum 2008-j */
+    OBJECT_ACCESS_POINT = 33,
+    OBJECT_ACCESS_RIGHTS = 34,
+    OBJECT_ACCESS_USER = 35,
+    OBJECT_ACCESS_ZONE = 36,
+    OBJECT_CREDENTIAL_DATA_INPUT = 37,  /* authentication-factor-input */
+    OBJECT_NETWORK_SECURITY = 38,       /* Addendum 2008-g */
+    OBJECT_BITSTRING_VALUE = 39,        /* Addendum 2008-w */
+    OBJECT_CHARACTERSTRING_VALUE = 40,  /* Addendum 2008-w */
+    OBJECT_DATE_PATTERN_VALUE = 41,     /* Addendum 2008-w */
+    OBJECT_DATE_VALUE = 42,             /* Addendum 2008-w */
+    OBJECT_DATETIME_PATTERN_VALUE = 43, /* Addendum 2008-w */
+    OBJECT_DATETIME_VALUE = 44,         /* Addendum 2008-w */
+    OBJECT_INTEGER_VALUE = 45,          /* Addendum 2008-w */
+    OBJECT_LARGE_ANALOG_VALUE = 46,     /* Addendum 2008-w */
+    OBJECT_OCTETSTRING_VALUE = 47,      /* Addendum 2008-w */
+    OBJECT_POSITIVE_INTEGER_VALUE = 48, /* Addendum 2008-w */
+    OBJECT_TIME_PATTERN_VALUE = 49,     /* Addendum 2008-w */
+    OBJECT_TIME_VALUE = 50,             /* Addendum 2008-w */
+    OBJECT_NOTIFICATION_FORWARDER = 51, /* Addendum 2010-af */
+    OBJECT_ALERT_ENROLLMENT = 52,       /* Addendum 2010-af */
+    OBJECT_CHANNEL = 53,                /* Addendum 2010-aa */
+    OBJECT_LIGHTING_OUTPUT = 54,        /* Addendum 2010-i */
+    OBJECT_BINARY_LIGHTING_OUTPUT = 55, /* Addendum 135-2012az */
+    OBJECT_NETWORK_PORT = 56,           /* Addendum 135-2012az */
+    OBJECT_ELEVATOR_GROUP = 57,         /* Addendum 135-2012aq */
+    OBJECT_ESCALATOR = 58,              /* Addendum 135-2012aq */
+    OBJECT_LIFT = 59,                   /* Addendum 135-2012aq */
+    OBJECT_STAGING = 60,                /* Addendum 135-2016bd */
+    OBJECT_AUDIT_LOG = 61,              /* Addendum 135-2016bi */
+    OBJECT_AUDIT_REPORTER = 62,         /* Addendum 135-2016bi */
+    OBJECT_COLOR = 63,                  /* Addendum 135-2020ca */
+    OBJECT_COLOR_TEMPERATURE = 64,      /* Addendum 135-2020ca */
+
+    /* Enumerated values 0-127 are reserved for definition by ASHRAE. */
+    /* Enumerated values 128-1023 may be used by others subject to  */
+    /* the procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+
+    OBJECT_PROPRIETARY_MIN = 128,
+    OBJECT_PROPRIETARY_MAX = 1023,
+    MAX_BACNET_OBJECT_TYPE = 1024,
+    MAX_ASHRAE_OBJECT_TYPE = 65
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPduTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPduTypes.cs
new file mode 100644
index 0000000..85a8b01
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPduTypes.cs
@@ -0,0 +1,22 @@
+namespace System.IO.BACnet;
+
+[Flags]
+/* note: these are not the real values, */
+/* but are shifted left for easy encoding */
+public enum BacnetPduTypes : byte
+{
+    PDU_TYPE_CONFIRMED_SERVICE_REQUEST = 0,
+    SERVER = 1,
+    NEGATIVE_ACK = 2,
+    SEGMENTED_RESPONSE_ACCEPTED = 2,
+    MORE_FOLLOWS = 4,
+    SEGMENTED_MESSAGE = 8,
+    PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST = 0x10,
+    PDU_TYPE_SIMPLE_ACK = 0x20,
+    PDU_TYPE_COMPLEX_ACK = 0x30,
+    PDU_TYPE_SEGMENT_ACK = 0x40,
+    PDU_TYPE_ERROR = 0x50,
+    PDU_TYPE_REJECT = 0x60,
+    PDU_TYPE_ABORT = 0x70,
+    PDU_TYPE_MASK = 0xF0,
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPolarity.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPolarity.cs
new file mode 100644
index 0000000..375b7ee
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPolarity.cs
@@ -0,0 +1,7 @@
+namespace System.IO.BACnet;
+
+public enum BacnetPolarity : byte
+{
+    POLARITY_NORMAL = 0,
+    POLARITY_REVERSE = 1
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramError.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramError.cs
new file mode 100644
index 0000000..6034c07
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramError.cs
@@ -0,0 +1,18 @@
+namespace System.IO.BACnet.Base;
+
+public enum BacnetProgramError : ushort
+{
+    PROGRAM_ERROR_NORMAL = 0,
+    PROGRAM_ERROR_LOAD_FAILED = 1,
+    PROGRAM_ERROR_INTERNAL = 2,
+    PROGRAM_ERROR_PROGRAM = 3,
+    PROGRAM_ERROR_OTHER = 4,
+    /* Enumerated values 0-63 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 64-65535 may be used by others subject to  */
+    /* the procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    PROGRAM_ERROR_PROPRIETARY_MIN = 64,
+    PROGRAM_ERROR_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramRequest.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramRequest.cs
new file mode 100644
index 0000000..83a5815
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramRequest.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet.Base;
+
+public enum BacnetProgramRequest
+{
+    PROGRAM_REQUEST_READY = 0,
+    PROGRAM_REQUEST_LOAD = 1,
+    PROGRAM_REQUEST_RUN = 2,
+    PROGRAM_REQUEST_HALT = 3,
+    PROGRAM_REQUEST_RESTART = 4,
+    PROGRAM_REQUEST_UNLOAD = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramState.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramState.cs
new file mode 100644
index 0000000..541b6be
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetProgramState.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet.Base;
+
+public enum BacnetProgramState
+{
+    PROGRAM_STATE_IDLE = 0,
+    PROGRAM_STATE_LOADING = 1,
+    PROGRAM_STATE_RUNNING = 2,
+    PROGRAM_STATE_WAITING = 3,
+    PROGRAM_STATE_HALTED = 4,
+    PROGRAM_STATE_UNLOADING = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyIds.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyIds.cs
new file mode 100644
index 0000000..eb21605
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyIds.cs
@@ -0,0 +1,577 @@
+namespace System.IO.BACnet;
+
+public enum BacnetPropertyIds
+{
+    PROP_ACKED_TRANSITIONS = 0,
+    PROP_ACK_REQUIRED = 1,
+    PROP_ACTION = 2,
+    PROP_ACTION_TEXT = 3,
+    PROP_ACTIVE_TEXT = 4,
+    PROP_ACTIVE_VT_SESSIONS = 5,
+    PROP_ALARM_VALUE = 6,
+    PROP_ALARM_VALUES = 7,
+    PROP_ALL = 8,
+    PROP_ALL_WRITES_SUCCESSFUL = 9,
+    PROP_APDU_SEGMENT_TIMEOUT = 10,
+    PROP_APDU_TIMEOUT = 11,
+    PROP_APPLICATION_SOFTWARE_VERSION = 12,
+    PROP_ARCHIVE = 13,
+    PROP_BIAS = 14,
+    PROP_CHANGE_OF_STATE_COUNT = 15,
+    PROP_CHANGE_OF_STATE_TIME = 16,
+    PROP_NOTIFICATION_CLASS = 17,
+    PROP_BLANK_1 = 18,
+    PROP_CONTROLLED_VARIABLE_REFERENCE = 19,
+    PROP_CONTROLLED_VARIABLE_UNITS = 20,
+    PROP_CONTROLLED_VARIABLE_VALUE = 21,
+    PROP_COV_INCREMENT = 22,
+    PROP_DATE_LIST = 23,
+    PROP_DAYLIGHT_SAVINGS_STATUS = 24,
+    PROP_DEADBAND = 25,
+    PROP_DERIVATIVE_CONSTANT = 26,
+    PROP_DERIVATIVE_CONSTANT_UNITS = 27,
+    PROP_DESCRIPTION = 28,
+    PROP_DESCRIPTION_OF_HALT = 29,
+    PROP_DEVICE_ADDRESS_BINDING = 30,
+    PROP_DEVICE_TYPE = 31,
+    PROP_EFFECTIVE_PERIOD = 32,
+    PROP_ELAPSED_ACTIVE_TIME = 33,
+    PROP_ERROR_LIMIT = 34,
+    PROP_EVENT_ENABLE = 35,
+    PROP_EVENT_STATE = 36,
+    PROP_EVENT_TYPE = 37,
+    PROP_EXCEPTION_SCHEDULE = 38,
+    PROP_FAULT_VALUES = 39,
+    PROP_FEEDBACK_VALUE = 40,
+    PROP_FILE_ACCESS_METHOD = 41,
+    PROP_FILE_SIZE = 42,
+    PROP_FILE_TYPE = 43,
+    PROP_FIRMWARE_REVISION = 44,
+    PROP_HIGH_LIMIT = 45,
+    PROP_INACTIVE_TEXT = 46,
+    PROP_IN_PROCESS = 47,
+    PROP_INSTANCE_OF = 48,
+    PROP_INTEGRAL_CONSTANT = 49,
+    PROP_INTEGRAL_CONSTANT_UNITS = 50,
+    PROP_ISSUE_CONFIRMED_NOTIFICATIONS = 51,
+    PROP_LIMIT_ENABLE = 52,
+    PROP_LIST_OF_GROUP_MEMBERS = 53,
+    PROP_LIST_OF_OBJECT_PROPERTY_REFERENCES = 54,
+    PROP_LIST_OF_SESSION_KEYS = 55,
+    PROP_LOCAL_DATE = 56,
+    PROP_LOCAL_TIME = 57,
+    PROP_LOCATION = 58,
+    PROP_LOW_LIMIT = 59,
+    PROP_MANIPULATED_VARIABLE_REFERENCE = 60,
+    PROP_MAXIMUM_OUTPUT = 61,
+    PROP_MAX_APDU_LENGTH_ACCEPTED = 62,
+    PROP_MAX_INFO_FRAMES = 63,
+    PROP_MAX_MASTER = 64,
+    PROP_MAX_PRES_VALUE = 65,
+    PROP_MINIMUM_OFF_TIME = 66,
+    PROP_MINIMUM_ON_TIME = 67,
+    PROP_MINIMUM_OUTPUT = 68,
+    PROP_MIN_PRES_VALUE = 69,
+    PROP_MODEL_NAME = 70,
+    PROP_MODIFICATION_DATE = 71,
+    PROP_NOTIFY_TYPE = 72,
+    PROP_NUMBER_OF_APDU_RETRIES = 73,
+    PROP_NUMBER_OF_STATES = 74,
+    PROP_OBJECT_IDENTIFIER = 75,
+    PROP_OBJECT_LIST = 76,
+    PROP_OBJECT_NAME = 77,
+    PROP_OBJECT_PROPERTY_REFERENCE = 78,
+    PROP_OBJECT_TYPE = 79,
+    PROP_OPTIONAL = 80,
+    PROP_OUT_OF_SERVICE = 81,
+    PROP_OUTPUT_UNITS = 82,
+    PROP_EVENT_PARAMETERS = 83,
+    PROP_POLARITY = 84,
+    PROP_PRESENT_VALUE = 85,
+    PROP_PRIORITY = 86,
+    PROP_PRIORITY_ARRAY = 87,
+    PROP_PRIORITY_FOR_WRITING = 88,
+    PROP_PROCESS_IDENTIFIER = 89,
+    PROP_PROGRAM_CHANGE = 90,
+    PROP_PROGRAM_LOCATION = 91,
+    PROP_PROGRAM_STATE = 92,
+    PROP_PROPORTIONAL_CONSTANT = 93,
+    PROP_PROPORTIONAL_CONSTANT_UNITS = 94,
+    PROP_PROTOCOL_CONFORMANCE_CLASS = 95,       /* deleted in version 1 revision 2 */
+    PROP_PROTOCOL_OBJECT_TYPES_SUPPORTED = 96,
+    PROP_PROTOCOL_SERVICES_SUPPORTED = 97,
+    PROP_PROTOCOL_VERSION = 98,
+    PROP_READ_ONLY = 99,
+    PROP_REASON_FOR_HALT = 100,
+    PROP_RECIPIENT = 101,
+    PROP_RECIPIENT_LIST = 102,
+    PROP_RELIABILITY = 103,
+    PROP_RELINQUISH_DEFAULT = 104,
+    PROP_REQUIRED = 105,
+    PROP_RESOLUTION = 106,
+    PROP_SEGMENTATION_SUPPORTED = 107,
+    PROP_SETPOINT = 108,
+    PROP_SETPOINT_REFERENCE = 109,
+    PROP_STATE_TEXT = 110,
+    PROP_STATUS_FLAGS = 111,
+    PROP_SYSTEM_STATUS = 112,
+    PROP_TIME_DELAY = 113,
+    PROP_TIME_OF_ACTIVE_TIME_RESET = 114,
+    PROP_TIME_OF_STATE_COUNT_RESET = 115,
+    PROP_TIME_SYNCHRONIZATION_RECIPIENTS = 116,
+    PROP_UNITS = 117,
+    PROP_UPDATE_INTERVAL = 118,
+    PROP_UTC_OFFSET = 119,
+    PROP_VENDOR_IDENTIFIER = 120,
+    PROP_VENDOR_NAME = 121,
+    PROP_VT_CLASSES_SUPPORTED = 122,
+    PROP_WEEKLY_SCHEDULE = 123,
+    PROP_ATTEMPTED_SAMPLES = 124,
+    PROP_AVERAGE_VALUE = 125,
+    PROP_BUFFER_SIZE = 126,
+    PROP_CLIENT_COV_INCREMENT = 127,
+    PROP_COV_RESUBSCRIPTION_INTERVAL = 128,
+    PROP_CURRENT_NOTIFY_TIME = 129,
+    PROP_EVENT_TIME_STAMPS = 130,
+    PROP_LOG_BUFFER = 131,
+    PROP_LOG_DEVICE_OBJECT_PROPERTY = 132,
+    /* The enable property is renamed from log-enable in
+       Addendum b to ANSI/ASHRAE 135-2004(135b-2) */
+    PROP_ENABLE = 133,
+    PROP_LOG_INTERVAL = 134,
+    PROP_MAXIMUM_VALUE = 135,
+    PROP_MINIMUM_VALUE = 136,
+    PROP_NOTIFICATION_THRESHOLD = 137,
+    PROP_PREVIOUS_NOTIFY_TIME = 138,
+    PROP_PROTOCOL_REVISION = 139,
+    PROP_RECORDS_SINCE_NOTIFICATION = 140,
+    PROP_RECORD_COUNT = 141,
+    PROP_START_TIME = 142,
+    PROP_STOP_TIME = 143,
+    PROP_STOP_WHEN_FULL = 144,
+    PROP_TOTAL_RECORD_COUNT = 145,
+    PROP_VALID_SAMPLES = 146,
+    PROP_WINDOW_INTERVAL = 147,
+    PROP_WINDOW_SAMPLES = 148,
+    PROP_MAXIMUM_VALUE_TIMESTAMP = 149,
+    PROP_MINIMUM_VALUE_TIMESTAMP = 150,
+    PROP_VARIANCE_VALUE = 151,
+    PROP_ACTIVE_COV_SUBSCRIPTIONS = 152,
+    PROP_BACKUP_FAILURE_TIMEOUT = 153,
+    PROP_CONFIGURATION_FILES = 154,
+    PROP_DATABASE_REVISION = 155,
+    PROP_DIRECT_READING = 156,
+    PROP_LAST_RESTORE_TIME = 157,
+    PROP_MAINTENANCE_REQUIRED = 158,
+    PROP_MEMBER_OF = 159,
+    PROP_MODE = 160,
+    PROP_OPERATION_EXPECTED = 161,
+    PROP_SETTING = 162,
+    PROP_SILENCED = 163,
+    PROP_TRACKING_VALUE = 164,
+    PROP_ZONE_MEMBERS = 165,
+    PROP_LIFE_SAFETY_ALARM_VALUES = 166,
+    PROP_MAX_SEGMENTS_ACCEPTED = 167,
+    PROP_PROFILE_NAME = 168,
+    PROP_AUTO_SLAVE_DISCOVERY = 169,
+    PROP_MANUAL_SLAVE_ADDRESS_BINDING = 170,
+    PROP_SLAVE_ADDRESS_BINDING = 171,
+    PROP_SLAVE_PROXY_ENABLE = 172,
+    PROP_LAST_NOTIFY_RECORD = 173,
+    PROP_SCHEDULE_DEFAULT = 174,
+    PROP_ACCEPTED_MODES = 175,
+    PROP_ADJUST_VALUE = 176,
+    PROP_COUNT = 177,
+    PROP_COUNT_BEFORE_CHANGE = 178,
+    PROP_COUNT_CHANGE_TIME = 179,
+    PROP_COV_PERIOD = 180,
+    PROP_INPUT_REFERENCE = 181,
+    PROP_LIMIT_MONITORING_INTERVAL = 182,
+    PROP_LOGGING_OBJECT = 183,
+    PROP_LOGGING_RECORD = 184,
+    PROP_PRESCALE = 185,
+    PROP_PULSE_RATE = 186,
+    PROP_SCALE = 187,
+    PROP_SCALE_FACTOR = 188,
+    PROP_UPDATE_TIME = 189,
+    PROP_VALUE_BEFORE_CHANGE = 190,
+    PROP_VALUE_SET = 191,
+    PROP_VALUE_CHANGE_TIME = 192,
+    /* enumerations 193-206 are new */
+    PROP_ALIGN_INTERVALS = 193,
+    /* enumeration 194 is unassigned */
+    PROP_INTERVAL_OFFSET = 195,
+    PROP_LAST_RESTART_REASON = 196,
+    PROP_LOGGING_TYPE = 197,
+    /* enumeration 198-201 is unassigned */
+    PROP_RESTART_NOTIFICATION_RECIPIENTS = 202,
+    PROP_TIME_OF_DEVICE_RESTART = 203,
+    PROP_TIME_SYNCHRONIZATION_INTERVAL = 204,
+    PROP_TRIGGER = 205,
+    PROP_UTC_TIME_SYNCHRONIZATION_RECIPIENTS = 206,
+    /* enumerations 207-211 are used in Addendum d to ANSI/ASHRAE 135-2004 */
+    PROP_NODE_SUBTYPE = 207,
+    PROP_NODE_TYPE = 208,
+    PROP_STRUCTURED_OBJECT_LIST = 209,
+    PROP_SUBORDINATE_ANNOTATIONS = 210,
+    PROP_SUBORDINATE_LIST = 211,
+    /* enumerations 212-225 are used in Addendum e to ANSI/ASHRAE 135-2004 */
+    PROP_ACTUAL_SHED_LEVEL = 212,
+    PROP_DUTY_WINDOW = 213,
+    PROP_EXPECTED_SHED_LEVEL = 214,
+    PROP_FULL_DUTY_BASELINE = 215,
+    /* enumerations 216-217 are unassigned */
+    /* enumerations 212-225 are used in Addendum e to ANSI/ASHRAE 135-2004 */
+    PROP_REQUESTED_SHED_LEVEL = 218,
+    PROP_SHED_DURATION = 219,
+    PROP_SHED_LEVEL_DESCRIPTIONS = 220,
+    PROP_SHED_LEVELS = 221,
+    PROP_STATE_DESCRIPTION = 222,
+    /* enumerations 223-225 are unassigned  */
+    /* enumerations 226-235 are used in Addendum f to ANSI/ASHRAE 135-2004 */
+    PROP_DOOR_ALARM_STATE = 226,
+    PROP_DOOR_EXTENDED_PULSE_TIME = 227,
+    PROP_DOOR_MEMBERS = 228,
+    PROP_DOOR_OPEN_TOO_LONG_TIME = 229,
+    PROP_DOOR_PULSE_TIME = 230,
+    PROP_DOOR_STATUS = 231,
+    PROP_DOOR_UNLOCK_DELAY_TIME = 232,
+    PROP_LOCK_STATUS = 233,
+    PROP_MASKED_ALARM_VALUES = 234,
+    PROP_SECURED_STATUS = 235,
+    /* enumerations 236-243 are unassigned  */
+    /* enumerations 244-311 are used in Addendum j to ANSI/ASHRAE 135-2004 */
+    PROP_ABSENTEE_LIMIT = 244,
+    PROP_ACCESS_ALARM_EVENTS = 245,
+    PROP_ACCESS_DOORS = 246,
+    PROP_ACCESS_EVENT = 247,
+    PROP_ACCESS_EVENT_AUTHENTICATION_FACTOR = 248,
+    PROP_ACCESS_EVENT_CREDENTIAL = 249,
+    PROP_ACCESS_EVENT_TIME = 250,
+    PROP_ACCESS_TRANSACTION_EVENTS = 251,
+    PROP_ACCOMPANIMENT = 252,
+    PROP_ACCOMPANIMENT_TIME = 253,
+    PROP_ACTIVATION_TIME = 254,
+    PROP_ACTIVE_AUTHENTICATION_POLICY = 255,
+    PROP_ASSIGNED_ACCESS_RIGHTS = 256,
+    PROP_AUTHENTICATION_FACTORS = 257,
+    PROP_AUTHENTICATION_POLICY_LIST = 258,
+    PROP_AUTHENTICATION_POLICY_NAMES = 259,
+    PROP_AUTHENTICATION_STATUS = 260,
+    PROP_AUTHORIZATION_MODE = 261,
+    PROP_BELONGS_TO = 262,
+    PROP_CREDENTIAL_DISABLE = 263,
+    PROP_CREDENTIAL_STATUS = 264,
+    PROP_CREDENTIALS = 265,
+    PROP_CREDENTIALS_IN_ZONE = 266,
+    PROP_DAYS_REMAINING = 267,
+    PROP_ENTRY_POINTS = 268,
+    PROP_EXIT_POINTS = 269,
+    PROP_EXPIRY_TIME = 270,
+    PROP_EXTENDED_TIME_ENABLE = 271,
+    PROP_FAILED_ATTEMPT_EVENTS = 272,
+    PROP_FAILED_ATTEMPTS = 273,
+    PROP_FAILED_ATTEMPTS_TIME = 274,
+    PROP_LAST_ACCESS_EVENT = 275,
+    PROP_LAST_ACCESS_POINT = 276,
+    PROP_LAST_CREDENTIAL_ADDED = 277,
+    PROP_LAST_CREDENTIAL_ADDED_TIME = 278,
+    PROP_LAST_CREDENTIAL_REMOVED = 279,
+    PROP_LAST_CREDENTIAL_REMOVED_TIME = 280,
+    PROP_LAST_USE_TIME = 281,
+    PROP_LOCKOUT = 282,
+    PROP_LOCKOUT_RELINQUISH_TIME = 283,
+    PROP_MASTER_EXEMPTION = 284,
+    PROP_MAX_FAILED_ATTEMPTS = 285,
+    PROP_MEMBERS = 286,
+    PROP_MUSTER_POINT = 287,
+    PROP_NEGATIVE_ACCESS_RULES = 288,
+    PROP_NUMBER_OF_AUTHENTICATION_POLICIES = 289,
+    PROP_OCCUPANCY_COUNT = 290,
+    PROP_OCCUPANCY_COUNT_ADJUST = 291,
+    PROP_OCCUPANCY_COUNT_ENABLE = 292,
+    PROP_OCCUPANCY_EXEMPTION = 293,
+    PROP_OCCUPANCY_LOWER_LIMIT = 294,
+    PROP_OCCUPANCY_LOWER_LIMIT_ENFORCED = 295,
+    PROP_OCCUPANCY_STATE = 296,
+    PROP_OCCUPANCY_UPPER_LIMIT = 297,
+    PROP_OCCUPANCY_UPPER_LIMIT_ENFORCED = 298,
+    PROP_PASSBACK_EXEMPTION = 299,
+    PROP_PASSBACK_MODE = 300,
+    PROP_PASSBACK_TIMEOUT = 301,
+    PROP_POSITIVE_ACCESS_RULES = 302,
+    PROP_REASON_FOR_DISABLE = 303,
+    PROP_SUPPORTED_FORMATS = 304,
+    PROP_SUPPORTED_FORMAT_CLASSES = 305,
+    PROP_THREAT_AUTHORITY = 306,
+    PROP_THREAT_LEVEL = 307,
+    PROP_TRACE_FLAG = 308,
+    PROP_TRANSACTION_NOTIFICATION_CLASS = 309,
+    PROP_USER_EXTERNAL_IDENTIFIER = 310,
+    PROP_USER_INFORMATION_REFERENCE = 311,
+    /* enumerations 312-316 are unassigned */
+    PROP_USER_NAME = 317,
+    PROP_USER_TYPE = 318,
+    PROP_USES_REMAINING = 319,
+    PROP_ZONE_FROM = 320,
+    PROP_ZONE_TO = 321,
+    PROP_ACCESS_EVENT_TAG = 322,
+    PROP_GLOBAL_IDENTIFIER = 323,
+    /* enumerations 324-325 are unassigned */
+    PROP_VERIFICATION_TIME = 326,
+    PROP_BASE_DEVICE_SECURITY_POLICY = 327,
+    PROP_DISTRIBUTION_KEY_REVISION = 328,
+    PROP_DO_NOT_HIDE = 329,
+    PROP_KEY_SETS = 330,
+    PROP_LAST_KEY_SERVER = 331,
+    PROP_NETWORK_ACCESS_SECURITY_POLICIES = 332,
+    PROP_PACKET_REORDER_TIME = 333,
+    PROP_SECURITY_PDU_TIMEOUT = 334,
+    PROP_SECURITY_TIME_WINDOW = 335,
+    PROP_SUPPORTED_SECURITY_ALGORITHM = 336,
+    PROP_UPDATE_KEY_SET_TIMEOUT = 337,
+    PROP_BACKUP_AND_RESTORE_STATE = 338,
+    PROP_BACKUP_PREPARATION_TIME = 339,
+    PROP_RESTORE_COMPLETION_TIME = 340,
+    PROP_RESTORE_PREPARATION_TIME = 341,
+    /* enumerations 342-344 are defined in Addendum 2008-w */
+    PROP_BIT_MASK = 342,
+    PROP_BIT_TEXT = 343,
+    PROP_IS_UTC = 344,
+    PROP_GROUP_MEMBERS = 345,
+    PROP_GROUP_MEMBER_NAMES = 346,
+    PROP_MEMBER_STATUS_FLAGS = 347,
+    PROP_REQUESTED_UPDATE_INTERVAL = 348,
+    PROP_COVU_PERIOD = 349,
+    PROP_COVU_RECIPIENTS = 350,
+    PROP_EVENT_MESSAGE_TEXTS = 351,
+    /* enumerations 352-363 are defined in Addendum 2010-af */
+    PROP_EVENT_MESSAGE_TEXTS_CONFIG = 352,
+    PROP_EVENT_DETECTION_ENABLE = 353,
+    PROP_EVENT_ALGORITHM_INHIBIT = 354,
+    PROP_EVENT_ALGORITHM_INHIBIT_REF = 355,
+    PROP_TIME_DELAY_NORMAL = 356,
+    PROP_RELIABILITY_EVALUATION_INHIBIT = 357,
+    PROP_FAULT_PARAMETERS = 358,
+    PROP_FAULT_TYPE = 359,
+    PROP_LOCAL_FORWARDING_ONLY = 360,
+    PROP_PROCESS_IDENTIFIER_FILTER = 361,
+    PROP_SUBSCRIBED_RECIPIENTS = 362,
+    PROP_PORT_FILTER = 363,
+    /* enumeration 364 is defined in Addendum 2010-ae */
+    PROP_AUTHORIZATION_EXEMPTIONS = 364,
+    /* enumerations 365-370 are defined in Addendum 2010-aa */
+    PROP_ALLOW_GROUP_DELAY_INHIBIT = 365,
+    PROP_CHANNEL_NUMBER = 366,
+    PROP_CONTROL_GROUPS = 367,
+    PROP_EXECUTION_DELAY = 368,
+    PROP_LAST_PRIORITY = 369,
+    PROP_WRITE_STATUS = 370,
+    /* enumeration 371 is defined in Addendum 2010-ao */
+    PROP_PROPERTY_LIST = 371,
+    /* enumeration 372 is defined in Addendum 2010-ak */
+    PROP_SERIAL_NUMBER = 372,
+    /* enumerations 373-386 are defined in Addendum 2010-i */
+    PROP_BLINK_WARN_ENABLE = 373,
+    PROP_DEFAULT_FADE_TIME = 374,
+    PROP_DEFAULT_RAMP_RATE = 375,
+    PROP_DEFAULT_STEP_INCREMENT = 376,
+    PROP_EGRESS_TIME = 377,
+    PROP_IN_PROGRESS = 378,
+    PROP_INSTANTANEOUS_POWER = 379,
+    PROP_LIGHTING_COMMAND = 380,
+    PROP_LIGHTING_COMMAND_DEFAULT_PRIORITY = 381,
+    PROP_MAX_ACTUAL_VALUE = 382,
+    PROP_MIN_ACTUAL_VALUE = 383,
+    PROP_POWER = 384,
+    PROP_TRANSITION = 385,
+    PROP_EGRESS_ACTIVE = 386,
+    PROP_INTERFACE_VALUE = 387,
+    PROP_FAULT_HIGH_LIMIT = 388,
+    PROP_FAULT_LOW_LIMIT = 389,
+    PROP_LOW_DIFF_LIMIT = 390,
+    /* enumerations 391-392 are defined in Addendum 135-2012az */
+    PROP_STRIKE_COUNT = 391,
+    PROP_TIME_OF_STRIKE_COUNT_RESET = 392,
+    /* enumerations 393-398 are defined in Addendum 135-2012ay */
+    PROP_DEFAULT_TIMEOUT = 393,
+    PROP_INITIAL_TIMEOUT = 394,
+    PROP_LAST_STATE_CHANGE = 395,
+    PROP_STATE_CHANGE_VALUES = 396,
+    PROP_TIMER_RUNNING = 397,
+    PROP_TIMER_STATE = 398,
+    /* enumerations 399-427 are defined in Addendum 2012-ai */
+    PROP_APDU_LENGTH = 399,
+    PROP_IP_ADDRESS = 400,
+    PROP_IP_DEFAULT_GATEWAY = 401,
+    PROP_IP_DHCP_ENABLE = 402,
+    PROP_IP_DHCP_LEASE_TIME = 403,
+    PROP_IP_DHCP_LEASE_TIME_REMAINING = 404,
+    PROP_IP_DHCP_SERVER = 405,
+    PROP_IP_DNS_SERVER = 406,
+    PROP_BACNET_IP_GLOBAL_ADDRESS = 407,
+    PROP_BACNET_IP_MODE = 408,
+    PROP_BACNET_IP_MULTICAST_ADDRESS = 409,
+    PROP_BACNET_IP_NAT_TRAVERSAL = 410,
+    PROP_IP_SUBNET_MASK = 411,
+    PROP_BACNET_IP_UDP_PORT = 412,
+    PROP_BBMD_ACCEPT_FD_REGISTRATIONS = 413,
+    PROP_BBMD_BROADCAST_DISTRIBUTION_TABLE = 414,
+    PROP_BBMD_FOREIGN_DEVICE_TABLE = 415,
+    PROP_CHANGES_PENDING = 416,
+    PROP_COMMAND = 417,
+    PROP_FD_BBMD_ADDRESS = 418,
+    PROP_FD_SUBSCRIPTION_LIFETIME = 419,
+    PROP_LINK_SPEED = 420,
+    PROP_LINK_SPEEDS = 421,
+    PROP_LINK_SPEED_AUTONEGOTIATE = 422,
+    PROP_MAC_ADDRESS = 423,
+    PROP_NETWORK_INTERFACE_NAME = 424,
+    PROP_NETWORK_NUMBER = 425,
+    PROP_NETWORK_NUMBER_QUALITY = 426,
+    PROP_NETWORK_TYPE = 427,
+    PROP_ROUTING_TABLE = 428,
+    PROP_VIRTUAL_MAC_ADDRESS_TABLE = 429,
+
+    // Addendum-135-2012as
+    PROP_COMMAND_TIME_ARRAY = 430,
+    PROP_CURRENT_COMMAND_PRIORITY = 431,
+    PROP_LAST_COMMAND_TIME = 432,
+    PROP_VALUE_SOURCE = 433,
+    PROP_VALUE_SOURCE_ARRAY = 434,
+    PROP_BACNET_IPV6_MODE = 435,
+    PROP_IPV6_ADDRESS = 436,
+    PROP_IPV6_PREFIX_LENGTH = 437,
+    PROP_BACNET_IPV6_UDP_PORT = 438,
+    PROP_IPV6_DEFAULT_GATEWAY = 439,
+    PROP_BACNET_IPV6_MULTICAST_ADDRESS = 440,
+    PROP_IPV6_DNS_SERVER = 441,
+    PROP_IPV6_AUTO_ADDRESSING_ENABLE = 442,
+    PROP_IPV6_DHCP_LEASE_TIME = 443,
+    PROP_IPV6_DHCP_LEASE_TIME_REMAINING = 444,
+    PROP_IPV6_DHCP_SERVER = 445,
+    PROP_IPV6_ZONE_INDEX = 446,
+    PROP_ASSIGNED_LANDING_CALLS = 447,
+    PROP_CAR_ASSIGNED_DIRECTION = 448,
+    PROP_CAR_DOOR_COMMAND = 449,
+    PROP_CAR_DOOR_STATUS = 450,
+    PROP_CAR_DOOR_TEXT = 451,
+    PROP_CAR_DOOR_ZONE = 452,
+    PROP_CAR_DRIVE_STATUS = 453,
+    PROP_CAR_LOAD = 454,
+    PROP_CAR_LOAD_UNITS = 455,
+    PROP_CAR_MODE = 456,
+    PROP_CAR_MOVING_DIRECTION = 457,
+    PROP_CAR_POSITION = 458,
+    PROP_ELEVATOR_GROUP = 459,
+    PROP_ENERGY_METER = 460,
+    PROP_ENERGY_METER_REF = 461,
+    PROP_ESCALATOR_MODE = 462,
+    PROP_FAULT_SIGNALS = 463,
+    PROP_FLOOR_TEXT = 464,
+    PROP_GROUP_ID = 465,
+    /* value 466 is unassigned */
+    PROP_GROUP_MODE = 467,
+    PROP_HIGHER_DECK = 468,
+    PROP_INSTALLATION_ID = 469,
+    PROP_LANDING_CALLS = 470,
+    PROP_LANDING_CALL_CONTROL = 471,
+    PROP_LANDING_DOOR_STATUS = 472,
+    PROP_LOWER_DECK = 473,
+    PROP_MACHINE_ROOM_ID = 474,
+    PROP_MAKING_CAR_CALL = 475,
+    PROP_NEXT_STOPPING_FLOOR = 476,
+    PROP_OPERATION_DIRECTION = 477,
+    PROP_PASSENGER_ALARM = 478,
+    PROP_POWER_MODE = 479,
+    PROP_REGISTERED_CAR_CALL = 480,
+    PROP_ACTIVE_COV_MULTIPLE_SUBSCRIPTIONS = 481,
+    PROP_PROTOCOL_LEVEL = 482,
+    PROP_REFERENCE_PORT = 483,
+    PROP_DEPLOYED_PROFILE_LOCATION = 484,
+    PROP_PROFILE_LOCATION = 485,
+    PROP_TAGS = 486,
+    PROP_SUBORDINATE_NODE_TYPES = 487,
+    PROP_SUBORDINATE_TAGS = 488,
+    PROP_SUBORDINATE_RELATIONSHIPS = 489,
+    PROP_DEFAULT_SUBORDINATE_RELATIONSHIP = 490,
+    PROP_REPRESENTS = 491,
+    PROP_DEFAULT_PRESENT_VALUE = 492,
+    PROP_PRESENT_STAGE = 493,
+    PROP_STAGES = 494,
+    PROP_STAGE_NAMES = 495,
+    PROP_TARGET_REFERENCES = 496,
+    PROP_AUDIT_SOURCE_LEVEL = 497,
+    PROP_AUDIT_LEVEL = 498,
+    PROP_AUDIT_NOTIFICATION_RECIPIENT = 499,
+    PROP_AUDIT_PRIORITY_FILTER = 500,
+    PROP_AUDITABLE_OPERATIONS = 501,
+    PROP_DELETE_ON_FORWARD = 502,
+    PROP_MAXIMUM_SEND_DELAY = 503,
+    PROP_MONITORED_OBJECTS = 504,
+    PROP_SEND_NOW = 505,
+    PROP_FLOOR_NUMBER = 506,
+    PROP_DEVICE_UUID = 507,
+    /* enumerations 508-511 are defined in Addendum 2020cc */
+    PROP_ADDITIONAL_REFERENCE_PORTS = 508,
+    PROP_CERTIFICATE_SIGNING_REQUEST_FILE = 509,
+    PROP_COMMAND_VALIDATION_RESULT = 510,
+    PROP_ISSUER_CERTIFICATE_FILES = 511,
+    /* The special property identifiers all, optional, and required  */
+    /* are reserved for use in the ReadPropertyConditional and */
+    /* ReadPropertyMultiple services or services not defined in this standard.
+     */
+    /* Enumerated values 0-511 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 512-4194303 may be used by others subject to the  */
+    /* procedures and constraints described in Clause 23.  */
+    PROP_PROPRIETARY_RANGE_MIN = 512,
+    PROP_PROPRIETARY_RANGE_MAX = 4194303,
+    /* enumerations 4194304-4194327 are defined in Addendum 2020cc */
+    PROP_MAX_BVLC_LENGTH_ACCEPTED = 4194304,
+    PROP_MAX_NPDU_LENGTH_ACCEPTED = 4194305,
+    PROP_OPERATIONAL_CERTIFICATE_FILE = 4194305,
+    PROP_CURRENT_HEALTH = 4194307,
+    PROP_SC_CONNECT_WAIT_TIMEOUT = 4194308,
+    PROP_SC_DIRECT_CONNECT_ACCEPT_ENABLE = 4194309,
+    PROP_SC_DIRECT_CONNECT_ACCEPT_URIS = 4194310,
+    PROP_SC_DIRECT_CONNECT_BINDING = 4194311,
+    PROP_SC_DIRECT_CONNECT_CONNECTION_STATUS = 4194312,
+    PROP_SC_DIRECT_CONNECT_INITIATE_ENABLE = 4194313,
+    PROP_SC_DISCONNECT_WAIT_TIMEOUT = 4194314,
+    PROP_SC_FAILED_CONNECTION_REQUESTS = 4194315,
+    PROP_SC_FAILOVER_HUB_CONNECTION_STATUS = 4194316,
+    PROP_SC_FAILOVER_HUB_URI = 4194317,
+    PROP_SC_HUB_CONNECTOR_STATE = 4194318,
+    PROP_SC_HUB_FUNCTION_ACCEPT_URIS = 4194319,
+    PROP_SC_HUB_FUNCTION_BINDING = 4194320,
+    PROP_SC_HUB_FUNCTION_CONNECTION_STATUS = 4194321,
+    PROP_SC_HUB_FUNCTION_ENABLE = 4194322,
+    PROP_SC_HEARTBEAT_TIMEOUT = 4194323,
+    PROP_SC_PRIMARY_HUB_CONNECTION_STATUS = 4194324,
+    PROP_SC_PRIMARY_HUB_URI = 4194325,
+    PROP_SC_MAXIMUM_RECONNECT_TIME = 4194326,
+    PROP_SC_MINIMUM_RECONNECT_TIME = 4194327,
+    /* enumerations 4194328-4194332 are defined in Addendum 2020ca */
+    PROP_COLOR_OVERRIDE = 4194328,
+    PROP_COLOR_REFERENCE = 4194329,
+    PROP_DEFAULT_COLOR = 4194330,
+    PROP_DEFAULT_COLOR_TEMPERATURE = 4194331,
+    PROP_OVERRIDE_COLOR_REFERENCE = 4194332,
+    PROP_COLOR_COMMAND = 4194334,
+    PROP_HIGH_END_TRIM = 4194335,
+    PROP_LOW_END_TRIM = 4194336,
+    PROP_TRIM_FADE_TIME = 4194337,
+
+    /* The special property identifiers all, optional, and required  */
+    /* are reserved for use in the ReadPropertyConditional and */
+    /* ReadPropertyMultiple services or services not defined in this standard. */
+    /* Enumerated values 0-511 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 512-4194303 may be used by others subject to the  */
+    /* procedures and constraints described in Clause 23.  */
+    /* Enumerated values 4194303-16777215 are reserved
+       for definition by ASHRAE.  */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    MAX_BACNET_PROPERTY_ID = 16777215
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyReference.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyReference.cs
new file mode 100644
index 0000000..3f463fd
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyReference.cs
@@ -0,0 +1,23 @@
+namespace System.IO.BACnet;
+
+public struct BacnetPropertyReference
+{
+    public uint propertyIdentifier;
+    public uint propertyArrayIndex;        /* optional */
+
+    public BacnetPropertyReference(uint id, uint arrayIndex)
+    {
+        propertyIdentifier = id;
+        propertyArrayIndex = arrayIndex;
+    }
+
+    public BacnetPropertyIds GetPropertyId()
+    {
+        return (BacnetPropertyIds)propertyIdentifier;
+    }
+
+    public override string ToString()
+    {
+        return $"{GetPropertyId()}";
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyState.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyState.cs
new file mode 100644
index 0000000..76dce11
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyState.cs
@@ -0,0 +1,48 @@
+namespace System.IO.BACnet;
+
+public struct BacnetPropertyState
+{
+    public enum BacnetPropertyStateTypes
+    {
+        BOOLEAN_VALUE,
+        BINARY_VALUE,
+        EVENT_TYPE,
+        POLARITY,
+        PROGRAM_CHANGE,
+        PROGRAM_STATE,
+        REASON_FOR_HALT,
+        RELIABILITY,
+        STATE,
+        SYSTEM_STATUS,
+        UNITS,
+        UNSIGNED_VALUE,
+        LIFE_SAFETY_MODE,
+        LIFE_SAFETY_STATE
+    }
+
+    public struct State
+    {
+        public bool boolean_value;
+        public BacnetBinaryPv binaryValue;
+        public BacnetEventTypes eventType;
+        public BacnetPolarity polarity;
+        public BacnetProgramRequest programChange;
+        public BacnetProgramState programState;
+        public BacnetProgramError programError;
+        public BacnetReliability reliability;
+        public BacnetEventStates state;
+        public BacnetDeviceStatus systemStatus;
+        public BacnetUnitsId units;
+        public uint unsignedValue;
+        public BacnetLifeSafetyModes lifeSafetyMode;
+        public BacnetLifeSafetyStates lifeSafetyState;
+    }
+
+    public BacnetPropertyStateTypes tag;
+    public State state;
+
+    public override string ToString()
+    {
+        return $"{tag}:{state}";
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyValue.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyValue.cs
new file mode 100644
index 0000000..6b046cd
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPropertyValue.cs
@@ -0,0 +1,13 @@
+namespace System.IO.BACnet;
+
+public struct BacnetPropertyValue
+{
+    public BacnetPropertyReference property;
+    public IList<BacnetValue> value;
+    public byte priority;
+
+    public override string ToString()
+    {
+        return property.ToString();
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpDisconnectReasons.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpDisconnectReasons.cs
new file mode 100644
index 0000000..068f3df
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpDisconnectReasons.cs
@@ -0,0 +1,9 @@
+namespace System.IO.BACnet;
+
+public enum BacnetPtpDisconnectReasons : byte
+{
+    PTP_DISCONNECT_NO_MORE_DATA = 0,
+    PTP_DISCONNECT_PREEMPTED = 1,
+    PTP_DISCONNECT_INVALID_PASSWORD = 2,
+    PTP_DISCONNECT_OTHER = 3,
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpFrameTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpFrameTypes.cs
new file mode 100644
index 0000000..c4158d4
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetPtpFrameTypes.cs
@@ -0,0 +1,24 @@
+namespace System.IO.BACnet;
+
+public enum BacnetPtpFrameTypes : byte
+{
+    FRAME_TYPE_HEARTBEAT_XOFF = 0,
+    FRAME_TYPE_HEARTBEAT_XON = 1,
+    FRAME_TYPE_DATA0 = 2,
+    FRAME_TYPE_DATA1 = 3,
+    FRAME_TYPE_DATA_ACK0_XOFF = 4,
+    FRAME_TYPE_DATA_ACK1_XOFF = 5,
+    FRAME_TYPE_DATA_ACK0_XON = 6,
+    FRAME_TYPE_DATA_ACK1_XON = 7,
+    FRAME_TYPE_DATA_NAK0_XOFF = 8,
+    FRAME_TYPE_DATA_NAK1_XOFF = 9,
+    FRAME_TYPE_DATA_NAK0_XON = 0x0A,
+    FRAME_TYPE_DATA_NAK1_XON = 0x0B,
+    FRAME_TYPE_CONNECT_REQUEST = 0x0C,
+    FRAME_TYPE_CONNECT_RESPONSE = 0x0D,
+    FRAME_TYPE_DISCONNECT_REQUEST = 0x0E,
+    FRAME_TYPE_DISCONNECT_RESPONSE = 0x0F,
+    FRAME_TYPE_TEST_REQUEST = 0x14,
+    FRAME_TYPE_TEST_RESPONSE = 0x15,
+    FRAME_TYPE_GREETING = 0xFF     //special invention
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessResult.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessResult.cs
new file mode 100644
index 0000000..d55b009
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessResult.cs
@@ -0,0 +1,13 @@
+namespace System.IO.BACnet;
+
+public struct BacnetReadAccessResult
+{
+    public BacnetObjectId objectIdentifier;
+    public IList<BacnetPropertyValue> values;
+
+    public BacnetReadAccessResult(BacnetObjectId objectIdentifier, IList<BacnetPropertyValue> values)
+    {
+        this.objectIdentifier = objectIdentifier;
+        this.values = values;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessSpecification.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessSpecification.cs
new file mode 100644
index 0000000..06cc690
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadAccessSpecification.cs
@@ -0,0 +1,40 @@
+namespace System.IO.BACnet;
+
+public struct BacnetReadAccessSpecification
+{
+    public BacnetObjectId objectIdentifier;
+    public IList<BacnetPropertyReference> propertyReferences;
+
+    public BacnetReadAccessSpecification(BacnetObjectId objectIdentifier, IList<BacnetPropertyReference> propertyReferences)
+    {
+        this.objectIdentifier = objectIdentifier;
+        this.propertyReferences = propertyReferences;
+    }
+
+    public static object Parse(string value)
+    {
+        var ret = new BacnetReadAccessSpecification();
+        if (string.IsNullOrEmpty(value)) return ret;
+        var tmp = value.Split(':');
+        if (tmp.Length < 2) return ret;
+        ret.objectIdentifier.type = (BacnetObjectTypes)Enum.Parse(typeof(BacnetObjectTypes), tmp[0]);
+        ret.objectIdentifier.instance = uint.Parse(tmp[1]);
+        var refs = new List<BacnetPropertyReference>();
+        for (var i = 2; i < tmp.Length; i++)
+        {
+            refs.Add(new BacnetPropertyReference
+            {
+                propertyArrayIndex = ASN1.BACNET_ARRAY_ALL,
+                propertyIdentifier = (uint)(BacnetPropertyIds)Enum.Parse(typeof(BacnetPropertyIds), tmp[i])
+            });
+        }
+        ret.propertyReferences = refs;
+        return ret;
+    }
+
+    public override string ToString()
+    {
+        return propertyReferences.Aggregate(objectIdentifier.ToString(), (current, r) =>
+            $"{current}:{(BacnetPropertyIds)r.propertyIdentifier}");
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadRangeRequestTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadRangeRequestTypes.cs
new file mode 100644
index 0000000..1d9ced2
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReadRangeRequestTypes.cs
@@ -0,0 +1,9 @@
+namespace System.IO.BACnet.Serialize;
+
+public enum BacnetReadRangeRequestTypes
+{
+    RR_BY_POSITION = 1,
+    RR_BY_SEQUENCE = 2,
+    RR_BY_TIME = 4,
+    RR_READ_ALL = 8
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReinitializedStates.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReinitializedStates.cs
new file mode 100644
index 0000000..e146109
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReinitializedStates.cs
@@ -0,0 +1,14 @@
+namespace System.IO.BACnet;
+
+public enum BacnetReinitializedStates
+{
+    BACNET_REINIT_COLDSTART = 0,
+    BACNET_REINIT_WARMSTART = 1,
+    BACNET_REINIT_STARTBACKUP = 2,
+    BACNET_REINIT_ENDBACKUP = 3,
+    BACNET_REINIT_STARTRESTORE = 4,
+    BACNET_REINIT_ENDRESTORE = 5,
+    BACNET_REINIT_ABORTRESTORE = 6,
+    BACNET_REINIT_ACTIVATE_CHANGES = 7,
+    BACNET_REINIT_IDLE = 255
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRejectReason.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRejectReason.cs
new file mode 100644
index 0000000..bb2a9e6
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRejectReason.cs
@@ -0,0 +1,84 @@
+namespace System.IO.BACnet;
+
+/// <summary>
+/// Possible reason for rejecting the PDU.
+/// </summary>
+/// <remarks>
+/// Enumerated values 0-63 are reserved for definition by ASHRAE.
+/// Enumerated values 64-255 may be used by others.
+/// </remarks>
+public enum BacnetRejectReason : byte
+{
+    /// <summary>
+    /// Generated in response to a confirmed request APDU that contains a syntax error
+    /// for which an error code has not been explicitly defined.
+    /// </summary>
+    OTHER = 0,
+
+    /// <summary>
+    /// A buffer capacity has been exceeded.
+    /// </summary>
+    BUFFER_OVERFLOW = 1,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU that omits a conditional
+    /// service argument that should be present or contains a conditional service
+    /// argument that should not be present. This condition could also elicit
+    /// a Reject PDU with a Reject Reason of <see cref="INVALID_TAG"/>.
+    /// </summary>
+    INCONSISTENT_PARAMETERS = 2,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU in which the encoding
+    /// of one or more of the service parameters does not follow the correct
+    /// type specification. This condition could also elicit a Reject PDU
+    /// with a Reject Reason of <see cref="INVALID_TAG"/>.
+    /// </summary>
+    INVALID_PARAMETER_DATA_TYPE = 3,
+
+    /// <summary>
+    /// While parsing a message, an invalid tag was encountered. Since an invalid tag
+    /// could confuse the parsing logic, any of the following Reject Reasons may also
+    /// be generated in response to a confirmed request containing an invalid tag:
+    /// <list type="bullet">   
+    /// <item><description><see cref="INCONSISTENT_PARAMETERS"/></description></item>
+    /// <item><description><see cref="INVALID_PARAMETER_DATA_TYPE"/></description></item>
+    /// <item><description><see cref="MISSING_REQUIRED_PARAMETER"/></description></item>
+    /// <item><description><see cref="TOO_MANY_ARGUMENTS"/></description></item>
+    /// </list>
+    /// </summary>
+    INVALID_TAG = 4,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU that is missing at least one
+    /// mandatory service argument. This condition could also elicit a Reject PDU with
+    /// a Reject Reason of <see cref="INVALID_TAG"/>.
+    /// </summary>
+    MISSING_REQUIRED_PARAMETER = 5,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU that conveys a parameter
+    /// whose value is outside the range defined for this service.
+    /// </summary>
+    PARAMETER_OUT_OF_RANGE = 6,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU in which the total number
+    /// of service arguments is greater than specified for the service. This condition
+    /// could also elicit a Reject PDU with a Reject Reason of <see cref="INVALID_TAG"/>.
+    /// </summary>
+    TOO_MANY_ARGUMENTS = 7,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU in which one or more of
+    /// the service parameters is decoded as an enumeration that is not defined by
+    /// the type specification of this parameter.
+    /// </summary>
+    UNDEFINED_ENUMERATION = 8,
+
+    /// <summary>
+    /// Generated in response to a confirmed request APDU in which the Service Choice
+    /// field specifies an unknown or unsupported service
+    /// </summary>
+    RECOGNIZED_SERVICE = 9
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReliability.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReliability.cs
new file mode 100644
index 0000000..6a4ae1b
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetReliability.cs
@@ -0,0 +1,27 @@
+namespace System.IO.BACnet;
+
+public enum BacnetReliability : uint
+{
+    RELIABILITY_NO_FAULT_DETECTED = 0,
+    RELIABILITY_NO_SENSOR = 1,
+    RELIABILITY_OVER_RANGE = 2,
+    RELIABILITY_UNDER_RANGE = 3,
+    RELIABILITY_OPEN_LOOP = 4,
+    RELIABILITY_SHORTED_LOOP = 5,
+    RELIABILITY_NO_OUTPUT = 6,
+    RELIABILITY_UNRELIABLE_OTHER = 7,
+    RELIABILITY_PROCESS_ERROR = 8,
+    RELIABILITY_MULTI_STATE_FAULT = 9,
+    RELIABILITY_CONFIGURATION_ERROR = 10,
+    RELIABILITY_MEMBER_FAULT = 11,
+    RELIABILITY_COMMUNICATION_FAILURE = 12,
+    RELIABILITY_TRIPPED = 13,
+    /* Enumerated values 0-63 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 64-65535 may be used by others subject to  */
+    /* the procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    RELIABILITY_PROPRIETARY_MIN = 64,
+    RELIABILITY_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRestartReason.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRestartReason.cs
new file mode 100644
index 0000000..c2f7950
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetRestartReason.cs
@@ -0,0 +1,14 @@
+namespace System.IO.BACnet;
+
+// From Loren Van Spronsen csharp-bacnet
+public enum BacnetRestartReason
+{
+    UNKNOWN = 0,
+    COLD_START = 1,
+    WARM_START = 2,
+    DETECTED_POWER_LOST = 3,
+    DETECTED_POWER_OFF = 4,
+    HARDWARE_WATCHDOG = 5,
+    SOFTWARE_WATCHDOG = 6,
+    SUSPENDED = 7
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetResultFlags.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetResultFlags.cs
new file mode 100644
index 0000000..31fd278
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetResultFlags.cs
@@ -0,0 +1,10 @@
+namespace System.IO.BACnet;
+
+[Flags]
+public enum BacnetResultFlags
+{
+    NONE = 0,
+    FIRST_ITEM = 1,
+    LAST_ITEM = 2,
+    MORE_ITEMS = 4,
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetSegmentations.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetSegmentations.cs
new file mode 100644
index 0000000..9562c1e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetSegmentations.cs
@@ -0,0 +1,9 @@
+namespace System.IO.BACnet;
+
+public enum BacnetSegmentations
+{
+    SEGMENTATION_BOTH = 0,
+    SEGMENTATION_TRANSMIT = 1,
+    SEGMENTATION_RECEIVE = 2,
+    SEGMENTATION_NONE = 3,
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetServicesSupported.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetServicesSupported.cs
new file mode 100644
index 0000000..b7d1e94
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetServicesSupported.cs
@@ -0,0 +1,62 @@
+namespace System.IO.BACnet;
+
+public enum BacnetServicesSupported
+{
+    /* Alarm and Event Services */
+    SERVICE_SUPPORTED_ACKNOWLEDGE_ALARM = 0,
+    SERVICE_SUPPORTED_CONFIRMED_COV_NOTIFICATION = 1,
+    SERVICE_SUPPORTED_CONFIRMED_EVENT_NOTIFICATION = 2,
+    SERVICE_SUPPORTED_GET_ALARM_SUMMARY = 3,
+    SERVICE_SUPPORTED_GET_ENROLLMENT_SUMMARY = 4,
+    SERVICE_SUPPORTED_GET_EVENT_INFORMATION = 39,
+    SERVICE_SUPPORTED_SUBSCRIBE_COV = 5,
+    SERVICE_SUPPORTED_SUBSCRIBE_COV_PROPERTY = 38,
+    SERVICE_SUPPORTED_LIFE_SAFETY_OPERATION = 37,
+    SERVICE_SUPPORTED_CONFIRMED_AUDIT_NOTIFICATION = 44,
+    SERVICE_SUPPORTED_AUDIT_LOG_QUERY = 45,
+    /* File Access Services */
+    SERVICE_SUPPORTED_ATOMIC_READ_FILE = 6,
+    SERVICE_SUPPORTED_ATOMIC_WRITE_FILE = 7,
+    /* Object Access Services */
+    SERVICE_SUPPORTED_ADD_LIST_ELEMENT = 8,
+    SERVICE_SUPPORTED_REMOVE_LIST_ELEMENT = 9,
+    SERVICE_SUPPORTED_CREATE_OBJECT = 10,
+    SERVICE_SUPPORTED_DELETE_OBJECT = 11,
+    SERVICE_SUPPORTED_READ_PROPERTY = 12,
+    SERVICE_SUPPORTED_READ_PROP_CONDITIONAL = 13,
+    SERVICE_SUPPORTED_READ_PROP_MULTIPLE = 14,
+    SERVICE_SUPPORTED_READ_RANGE = 35,
+    SERVICE_SUPPORTED_WRITE_PROPERTY = 15,
+    SERVICE_SUPPORTED_WRITE_PROP_MULTIPLE = 16,
+    SERVICE_SUPPORTED_WRITE_GROUP = 40,
+    /* Remote Device Management Services */
+    SERVICE_SUPPORTED_DEVICE_COMMUNICATION_CONTROL = 17,
+    SERVICE_SUPPORTED_PRIVATE_TRANSFER = 18,
+    SERVICE_SUPPORTED_TEXT_MESSAGE = 19,
+    SERVICE_SUPPORTED_REINITIALIZE_DEVICE = 20,
+    SERVICE_SUPPORTED_WHO_AM_I = 47,
+    SERVICE_SUPPORTED_YOU_ARE = 48,
+    /* Virtual Terminal Services */
+    SERVICE_SUPPORTED_VT_OPEN = 21,
+    SERVICE_SUPPORTED_VT_CLOSE = 22,
+    SERVICE_SUPPORTED_VT_DATA = 23,
+    /* Security Services */
+    SERVICE_SUPPORTED_AUTHENTICATE = 24,
+    SERVICE_SUPPORTED_REQUEST_KEY = 25,
+    /* Unconfirmed Services */
+    SERVICE_SUPPORTED_I_AM = 26,
+    SERVICE_SUPPORTED_I_HAVE = 27,
+    SERVICE_SUPPORTED_UNCONFIRMED_COV_NOTIFICATION = 28,
+    SERVICE_SUPPORTED_UNCONFIRMED_EVENT_NOTIFICATION = 29,
+    SERVICE_SUPPORTED_UNCONFIRMED_PRIVATE_TRANSFER = 30,
+    SERVICE_SUPPORTED_UNCONFIRMED_TEXT_MESSAGE = 31,
+    SERVICE_SUPPORTED_TIME_SYNCHRONIZATION = 32,
+    SERVICE_SUPPORTED_UTC_TIME_SYNCHRONIZATION = 36,
+    SERVICE_SUPPORTED_WHO_HAS = 33,
+    SERVICE_SUPPORTED_WHO_IS = 34,
+    SERVICE_SUPPORTED_UNCONFIRMED_AUDIT_NOTIFICATION = 46,
+    /* Other services to be added as they are defined. */
+    /* All values in this production are reserved */
+    /* for definition by ASHRAE. */
+    MAX_BACNET_SERVICES_SUPPORTED = 47
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetStatusFlags.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetStatusFlags.cs
new file mode 100644
index 0000000..412e2b7
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetStatusFlags.cs
@@ -0,0 +1,10 @@
+namespace System.IO.BACnet;
+
+[Flags]
+public enum BacnetStatusFlags
+{
+    STATUS_FLAG_IN_ALARM = 1,
+    STATUS_FLAG_FAULT = 2,
+    STATUS_FLAG_OVERRIDDEN = 4,
+    STATUS_FLAG_OUT_OF_SERVICE = 8
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTimestampTags.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTimestampTags.cs
new file mode 100644
index 0000000..dcc886f
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTimestampTags.cs
@@ -0,0 +1,9 @@
+namespace System.IO.BACnet;
+
+public enum BacnetTimestampTags
+{
+    TIME_STAMP_NONE = -1,
+    TIME_STAMP_TIME = 0,
+    TIME_STAMP_SEQUENCE = 1,
+    TIME_STAMP_DATETIME = 2
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTrendLogValueType.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTrendLogValueType.cs
new file mode 100644
index 0000000..c26fabe
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetTrendLogValueType.cs
@@ -0,0 +1,18 @@
+namespace System.IO.BACnet;
+
+public enum BacnetTrendLogValueType : byte
+{
+    // Copyright (C) 2009 Peter Mc Shane in Steve Karg Stack, trendlog.h
+    // Thank's to it's encoding sample, very usefull for this decoding work
+    TL_TYPE_STATUS = 0,
+    TL_TYPE_BOOL = 1,
+    TL_TYPE_REAL = 2,
+    TL_TYPE_ENUM = 3,
+    TL_TYPE_UNSIGN = 4,
+    TL_TYPE_SIGN = 5,
+    TL_TYPE_BITS = 6,
+    TL_TYPE_NULL = 7,
+    TL_TYPE_ERROR = 8,
+    TL_TYPE_DELTA = 9,
+    TL_TYPE_ANY = 10
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnconfirmedServices.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnconfirmedServices.cs
new file mode 100644
index 0000000..cf75c13
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnconfirmedServices.cs
@@ -0,0 +1,30 @@
+namespace System.IO.BACnet;
+
+public enum BacnetUnconfirmedServices : byte
+{
+    SERVICE_UNCONFIRMED_I_AM = 0,
+    SERVICE_UNCONFIRMED_I_HAVE = 1,
+    SERVICE_UNCONFIRMED_COV_NOTIFICATION = 2,
+    SERVICE_UNCONFIRMED_EVENT_NOTIFICATION = 3,
+    SERVICE_UNCONFIRMED_PRIVATE_TRANSFER = 4,
+    SERVICE_UNCONFIRMED_TEXT_MESSAGE = 5,
+    SERVICE_UNCONFIRMED_TIME_SYNCHRONIZATION = 6,
+    SERVICE_UNCONFIRMED_WHO_HAS = 7,
+    SERVICE_UNCONFIRMED_WHO_IS = 8,
+    SERVICE_UNCONFIRMED_UTC_TIME_SYNCHRONIZATION = 9,
+    /* addendum 2010-aa */
+    SERVICE_UNCONFIRMED_WRITE_GROUP = 10,
+    /* addendum 2012-aq */
+    SERVICE_UNCONFIRMED_COV_NOTIFICATION_MULTIPLE = 11,
+    /* addendum 2016-bi */
+    SERVICE_UNCONFIRMED_AUDIT_NOTIFICATION = 12,
+    /* addendum 2016-bz */
+    SERVICE_UNCONFIRMED_WHO_AM_I = 13,
+    SERVICE_UNCONFIRMED_YOU_ARE = 14,
+    /* Other services to be added as they are defined. */
+    /* All choice values in this production are reserved */
+    /* for definition by ASHRAE. */
+    /* Proprietary extensions are made by using the */
+    /* UnconfirmedPrivateTransfer service. See Clause 23. */
+    MAX_BACNET_UNCONFIRMED_SERVICE = 15
+};
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnitsId.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnitsId.cs
new file mode 100644
index 0000000..a7857bf
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetUnitsId.cs
@@ -0,0 +1,311 @@
+namespace System.IO.BACnet;
+
+// Add FC : from Karg's Stack
+public enum BacnetUnitsId
+{
+    UNITS_METERS_PER_SECOND_PER_SECOND = 166,
+    /* Area */
+    UNITS_SQUARE_METERS = 0,
+    UNITS_SQUARE_CENTIMETERS = 116,
+    UNITS_SQUARE_FEET = 1,
+    UNITS_SQUARE_INCHES = 115,
+    /* Currency */
+    UNITS_CURRENCY1 = 105,
+    UNITS_CURRENCY2 = 106,
+    UNITS_CURRENCY3 = 107,
+    UNITS_CURRENCY4 = 108,
+    UNITS_CURRENCY5 = 109,
+    UNITS_CURRENCY6 = 110,
+    UNITS_CURRENCY7 = 111,
+    UNITS_CURRENCY8 = 112,
+    UNITS_CURRENCY9 = 113,
+    UNITS_CURRENCY10 = 114,
+    /* Electrical */
+    UNITS_MILLIAMPERES = 2,
+    UNITS_AMPERES = 3,
+    UNITS_AMPERES_PER_METER = 167,
+    UNITS_AMPERES_PER_SQUARE_METER = 168,
+    UNITS_AMPERE_SQUARE_METERS = 169,
+    UNITS_DECIBELS = 199,
+    UNITS_DECIBELS_MILLIVOLT = 200,
+    UNITS_DECIBELS_VOLT = 201,
+    UNITS_FARADS = 170,
+    UNITS_HENRYS = 171,
+    UNITS_OHMS = 4,
+    UNITS_OHM_METERS = 172,
+    UNITS_MILLIOHMS = 145,
+    UNITS_KILOHMS = 122,
+    UNITS_MEGOHMS = 123,
+    UNITS_MICROSIEMENS = 190,
+    UNITS_MILLISIEMENS = 202,
+    UNITS_SIEMENS = 173,        /* 1 mho equals 1 siemens */
+    UNITS_SIEMENS_PER_METER = 174,
+    UNITS_TESLAS = 175,
+    UNITS_VOLTS = 5,
+    UNITS_MILLIVOLTS = 124,
+    UNITS_KILOVOLTS = 6,
+    UNITS_MEGAVOLTS = 7,
+    UNITS_VOLT_AMPERES = 8,
+    UNITS_KILOVOLT_AMPERES = 9,
+    UNITS_MEGAVOLT_AMPERES = 10,
+    UNITS_VOLT_AMPERES_REACTIVE = 11,
+    UNITS_KILOVOLT_AMPERES_REACTIVE = 12,
+    UNITS_MEGAVOLT_AMPERES_REACTIVE = 13,
+    UNITS_VOLTS_PER_DEGREE_KELVIN = 176,
+    UNITS_VOLTS_PER_METER = 177,
+    UNITS_DEGREES_PHASE = 14,
+    UNITS_POWER_FACTOR = 15,
+    UNITS_WEBERS = 178,
+    /* Energy */
+    UNITS_JOULES = 16,
+    UNITS_KILOJOULES = 17,
+    UNITS_KILOJOULES_PER_KILOGRAM = 125,
+    UNITS_MEGAJOULES = 126,
+    UNITS_WATT_HOURS = 18,
+    UNITS_KILOWATT_HOURS = 19,
+    UNITS_MEGAWATT_HOURS = 146,
+    UNITS_WATT_HOURS_REACTIVE = 203,
+    UNITS_KILOWATT_HOURS_REACTIVE = 204,
+    UNITS_MEGAWATT_HOURS_REACTIVE = 205,
+    UNITS_BTUS = 20,
+    UNITS_KILO_BTUS = 147,
+    UNITS_MEGA_BTUS = 148,
+    UNITS_THERMS = 21,
+    UNITS_TON_HOURS = 22,
+    /* Enthalpy */
+    UNITS_JOULES_PER_KILOGRAM_DRY_AIR = 23,
+    UNITS_KILOJOULES_PER_KILOGRAM_DRY_AIR = 149,
+    UNITS_MEGAJOULES_PER_KILOGRAM_DRY_AIR = 150,
+    UNITS_BTUS_PER_POUND_DRY_AIR = 24,
+    UNITS_BTUS_PER_POUND = 117,
+    /* Entropy */
+    UNITS_JOULES_PER_DEGREE_KELVIN = 127,
+    UNITS_KILOJOULES_PER_DEGREE_KELVIN = 151,
+    UNITS_MEGAJOULES_PER_DEGREE_KELVIN = 152,
+    UNITS_JOULES_PER_KILOGRAM_DEGREE_KELVIN = 128,
+    /* Force */
+    UNITS_NEWTON = 153,
+    /* Frequency */
+    UNITS_CYCLES_PER_HOUR = 25,
+    UNITS_CYCLES_PER_MINUTE = 26,
+    UNITS_HERTZ = 27,
+    UNITS_KILOHERTZ = 129,
+    UNITS_MEGAHERTZ = 130,
+    UNITS_PER_HOUR = 131,
+    /* Humidity */
+    UNITS_GRAMS_OF_WATER_PER_KILOGRAM_DRY_AIR = 28,
+    UNITS_PERCENT_RELATIVE_HUMIDITY = 29,
+    /* Length */
+    UNITS_MICROMETERS = 194,
+    UNITS_MILLIMETERS = 30,
+    UNITS_CENTIMETERS = 118,
+    UNITS_KILOMETERS = 193,
+    UNITS_METERS = 31,
+    UNITS_INCHES = 32,
+    UNITS_FEET = 33,
+    /* Light */
+    UNITS_CANDELAS = 179,
+    UNITS_CANDELAS_PER_SQUARE_METER = 180,
+    UNITS_WATTS_PER_SQUARE_FOOT = 34,
+    UNITS_WATTS_PER_SQUARE_METER = 35,
+    UNITS_LUMENS = 36,
+    UNITS_LUXES = 37,
+    UNITS_FOOT_CANDLES = 38,
+    /* Mass */
+    UNITS_MILLIGRAMS = 196,
+    UNITS_GRAMS = 195,
+    UNITS_KILOGRAMS = 39,
+    UNITS_POUNDS_MASS = 40,
+    UNITS_TONS = 41,
+    /* Mass Flow */
+    UNITS_GRAMS_PER_SECOND = 154,
+    UNITS_GRAMS_PER_MINUTE = 155,
+    UNITS_KILOGRAMS_PER_SECOND = 42,
+    UNITS_KILOGRAMS_PER_MINUTE = 43,
+    UNITS_KILOGRAMS_PER_HOUR = 44,
+    UNITS_POUNDS_MASS_PER_SECOND = 119,
+    UNITS_POUNDS_MASS_PER_MINUTE = 45,
+    UNITS_POUNDS_MASS_PER_HOUR = 46,
+    UNITS_TONS_PER_HOUR = 156,
+    /* Power */
+    UNITS_MILLIWATTS = 132,
+    UNITS_WATTS = 47,
+    UNITS_KILOWATTS = 48,
+    UNITS_MEGAWATTS = 49,
+    UNITS_BTUS_PER_HOUR = 50,
+    UNITS_KILO_BTUS_PER_HOUR = 157,
+    UNITS_HORSEPOWER = 51,
+    UNITS_TONS_REFRIGERATION = 52,
+    /* Pressure */
+    UNITS_PASCALS = 53,
+    UNITS_HECTOPASCALS = 133,
+    UNITS_KILOPASCALS = 54,
+    UNITS_MILLIBARS = 134,
+    UNITS_BARS = 55,
+    UNITS_POUNDS_FORCE_PER_SQUARE_INCH = 56,
+    UNITS_MILLIMETERS_OF_WATER = 206,
+    UNITS_CENTIMETERS_OF_WATER = 57,
+    UNITS_INCHES_OF_WATER = 58,
+    UNITS_MILLIMETERS_OF_MERCURY = 59,
+    UNITS_CENTIMETERS_OF_MERCURY = 60,
+    UNITS_INCHES_OF_MERCURY = 61,
+    /* Temperature */
+    UNITS_DEGREES_CELSIUS = 62,
+    UNITS_DEGREES_KELVIN = 63,
+    UNITS_DEGREES_KELVIN_PER_HOUR = 181,
+    UNITS_DEGREES_KELVIN_PER_MINUTE = 182,
+    UNITS_DEGREES_FAHRENHEIT = 64,
+    UNITS_DEGREE_DAYS_CELSIUS = 65,
+    UNITS_DEGREE_DAYS_FAHRENHEIT = 66,
+    UNITS_DELTA_DEGREES_FAHRENHEIT = 120,
+    UNITS_DELTA_DEGREES_KELVIN = 121,
+    /* Time */
+    UNITS_YEARS = 67,
+    UNITS_MONTHS = 68,
+    UNITS_WEEKS = 69,
+    UNITS_DAYS = 70,
+    UNITS_HOURS = 71,
+    UNITS_MINUTES = 72,
+    UNITS_SECONDS = 73,
+    UNITS_HUNDREDTHS_SECONDS = 158,
+    UNITS_MILLISECONDS = 159,
+    /* Torque */
+    UNITS_NEWTON_METERS = 160,
+    /* Velocity */
+    UNITS_MILLIMETERS_PER_SECOND = 161,
+    UNITS_MILLIMETERS_PER_MINUTE = 162,
+    UNITS_METERS_PER_SECOND = 74,
+    UNITS_METERS_PER_MINUTE = 163,
+    UNITS_METERS_PER_HOUR = 164,
+    UNITS_KILOMETERS_PER_HOUR = 75,
+    UNITS_FEET_PER_SECOND = 76,
+    UNITS_FEET_PER_MINUTE = 77,
+    UNITS_MILES_PER_HOUR = 78,
+    /* Volume */
+    UNITS_CUBIC_FEET = 79,
+    UNITS_CUBIC_METERS = 80,
+    UNITS_IMPERIAL_GALLONS = 81,
+    UNITS_MILLILITERS = 197,
+    UNITS_LITERS = 82,
+    UNITS_US_GALLONS = 83,
+    /* Volumetric Flow */
+    UNITS_CUBIC_FEET_PER_SECOND = 142,
+    UNITS_CUBIC_FEET_PER_MINUTE = 84,
+    // One unit in Addendum 135-2012bg
+    UNITS_MILLION_CUBIC_FEET_PER_MINUTE = 254,
+    UNITS_CUBIC_FEET_PER_HOUR = 191,
+    // five units in Addendum 135-2012bg
+    UNITS_STANDARD_CUBIC_FEET_PER_DAY = 47808,
+    UNITS_MILLION_STANDARD_CUBIC_FEET_PER_DAY = 47809,
+    UNITS_THOUSAND_CUBIC_FEET_PER_DAY = 47810,
+    UNITS_THOUSAND_STANDARD_CUBIC_FEET_PER_DAY = 47811,
+    UINITS_POUNDS_MASS_PER_DAY = 47812,
+    UNITS_CUBIC_METERS_PER_SECOND = 85,
+    UNITS_CUBIC_METERS_PER_MINUTE = 165,
+    UNITS_CUBIC_METERS_PER_HOUR = 135,
+    UNITS_IMPERIAL_GALLONS_PER_MINUTE = 86,
+    UNITS_MILLILITERS_PER_SECOND = 198,
+    UNITS_LITERS_PER_SECOND = 87,
+    UNITS_LITERS_PER_MINUTE = 88,
+    UNITS_LITERS_PER_HOUR = 136,
+    UNITS_US_GALLONS_PER_MINUTE = 89,
+    UNITS_US_GALLONS_PER_HOUR = 192,
+    /* Other */
+    UNITS_DEGREES_ANGULAR = 90,
+    UNITS_DEGREES_CELSIUS_PER_HOUR = 91,
+    UNITS_DEGREES_CELSIUS_PER_MINUTE = 92,
+    UNITS_DEGREES_FAHRENHEIT_PER_HOUR = 93,
+    UNITS_DEGREES_FAHRENHEIT_PER_MINUTE = 94,
+    UNITS_JOULE_SECONDS = 183,
+    UNITS_KILOGRAMS_PER_CUBIC_METER = 186,
+    UNITS_KW_HOURS_PER_SQUARE_METER = 137,
+    UNITS_KW_HOURS_PER_SQUARE_FOOT = 138,
+    UNITS_MEGAJOULES_PER_SQUARE_METER = 139,
+    UNITS_MEGAJOULES_PER_SQUARE_FOOT = 140,
+    UNITS_NO_UNITS = 95,
+    UNITS_NEWTON_SECONDS = 187,
+    UNITS_NEWTONS_PER_METER = 188,
+    UNITS_PARTS_PER_MILLION = 96,
+    UNITS_PARTS_PER_BILLION = 97,
+    UNITS_PERCENT = 98,
+    UNITS_PERCENT_OBSCURATION_PER_FOOT = 143,
+    UNITS_PERCENT_OBSCURATION_PER_METER = 144,
+    UNITS_PERCENT_PER_SECOND = 99,
+    UNITS_PER_MINUTE = 100,
+    UNITS_PER_SECOND = 101,
+    UNITS_PSI_PER_DEGREE_FAHRENHEIT = 102,
+    UNITS_RADIANS = 103,
+    UNITS_RADIANS_PER_SECOND = 184,
+    UNITS_REVOLUTIONS_PER_MINUTE = 104,
+    UNITS_SQUARE_METERS_PER_NEWTON = 185,
+    UNITS_WATTS_PER_METER_PER_DEGREE_KELVIN = 189,
+    UNITS_WATTS_PER_SQUARE_METER_DEGREE_KELVIN = 141,
+    UNITS_PER_MILLE = 207,
+    UNITS_GRAMS_PER_GRAM = 208,
+    UNITS_KILOGRAMS_PER_KILOGRAM = 209,
+    UNITS_GRAMS_PER_KILOGRAM = 210,
+    UNITS_MILLIGRAMS_PER_GRAM = 211,
+    UNITS_MILLIGRAMS_PER_KILOGRAM = 212,
+    UNITS_GRAMS_PER_MILLILITER = 213,
+    UNITS_GRAMS_PER_LITER = 214,
+    UNITS_MILLIGRAMS_PER_LITER = 215,
+    UNITS_MICROGRAMS_PER_LITER = 216,
+    UNITS_GRAMS_PER_CUBIC_METER = 217,
+    UNITS_MILLIGRAMS_PER_CUBIC_METER = 218,
+    UNITS_MICROGRAMS_PER_CUBIC_METER = 219,
+    UNITS_NANOGRAMS_PER_CUBIC_METER = 220,
+    UNITS_GRAMS_PER_CUBIC_CENTIMETER = 221,
+    UNITS_BECQUERELS = 222,
+    UNITS_KILOBECQUERELS = 223,
+    UNITS_MEGABECQUERELS = 224,
+    UNITS_GRAY = 225,
+    UNITS_MILLIGRAY = 226,
+    UNITS_MICROGRAY = 227,
+    UNITS_SIEVERTS = 228,
+    UNITS_MILLISIEVERTS = 229,
+    UNITS_MICROSIEVERTS = 230,
+    UNITS_MICROSIEVERTS_PER_HOUR = 231,
+    UNITS_DECIBELS_A = 232,
+    UNITS_NEPHELOMETRIC_TURBIDITY_UNIT = 233,
+    UNITS_PH = 234,
+    UNITS_GRAMS_PER_SQUARE_METER = 235,
+    // Since Addendum 135-2012ar
+    UNITS_MINUTES_PER_DEGREE_KELVIN = 236,
+    UNITS_METER_SQUARED_PER_METER = 237,
+    UNITS_AMPERE_SECONDS = 238,
+    UNITS_VOLT_AMPERE_HOURS = 239,
+    UNITS_KILOVOLT_AMPERE_HOURS = 240,
+    UNITS_MEGAVOLT_AMPERE_HOURS = 241,
+    UNITS_VOLT_AMPERE_HOURS_REACTIVE = 242,
+    UNITS_KILOVOLT_AMPERE_HOURS_REACTIVE = 243,
+    UNITS_MEGAVOLT_AMPERE_HOURS_REACTIVE = 244,
+    UNITS_VOLT_SQUARE_HOURS = 245,
+    UNITS_AMPERE_SQUARE_HOURS = 246,
+    UNITS_JOULE_PER_HOURS = 247,
+    UNITS_CUBIC_FEET_PER_DAY = 248,
+    UNITS_CUBIC_METERS_PER_DAY = 249,
+    UNITS_WATT_HOURS_PER_CUBIC_METER = 250,
+    UNITS_JOULES_PER_CUBIC_METER = 251,
+    UNITS_MOLE_PERCENT = 252,
+    UNITS_PASCAL_SECONDS = 253,
+    UNITS_MILLION_STANDARD_CUBIC_FEET_PER_MINUTE = 254,
+    UNITS_RESERVED_RANGE_MAX = 255,
+    /* Enumerated values 256-47807 may be used by others
+       subject to the procedures and constraints described in Clause 23. */
+    UNITS_PROPRIETARY_RANGE_MIN = 256,
+    UNITS_PROPRIETARY_RANGE_MAX = 47807,
+    /* Enumerated values 47808-49999 are reserved for definition by ASHRAE. */
+    UNITS_RESERVED_RANGE_MIN2 = 47808,
+    UNITS_POUNDS_MASS_PER_DAY = 47812,
+    /* 47813 - NOT USED */
+    UNITS_MILLIREMS = 47814,
+    UNITS_MILLIREMS_PER_HOUR = 47815,
+    UNITS_RESERVED_RANGE_MAX2 = 49999,
+    UNITS_PROPRIETARY_RANGE_MIN2 = 50000,
+    /* Enumerated values 50000-65535 may be used by others
+       subject to the procedures and constraints described in Clause 23. */
+    /* do the proprietary range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    UNITS_PROPRIETARY_RANGE_MAX2 = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetValue.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetValue.cs
new file mode 100644
index 0000000..be98d82
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetValue.cs
@@ -0,0 +1,89 @@
+namespace System.IO.BACnet;
+
+public struct BacnetValue
+{
+    public BacnetApplicationTags Tag;
+    public object Value;
+
+    public BacnetValue(BacnetApplicationTags tag, object value)
+    {
+        Tag = tag;
+        Value = value;
+    }
+
+    public BacnetValue(object value)
+    {
+        Value = value;
+        Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL;
+
+        //guess at the tag
+        if (value != null)
+            Tag = TagFromType(value.GetType());
+    }
+
+    public BacnetApplicationTags TagFromType(Type t)
+    {
+        if (t == typeof(string))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_CHARACTER_STRING;
+        if (t == typeof(int) || t == typeof(short) || t == typeof(sbyte))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT;
+        if (t == typeof(uint) || t == typeof(ushort) || t == typeof(byte))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+        if (t == typeof(bool))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN;
+        if (t == typeof(float))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL;
+        if (t == typeof(double))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE;
+        if (t == typeof(BacnetBitString))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING;
+        if (t == typeof(BacnetObjectId))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+        if (t == typeof(BacnetError))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR;
+        if (t == typeof(BacnetDeviceObjectPropertyReference))
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_PROPERTY_REFERENCE;
+        if (t.IsEnum)
+            return BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED;
+
+        return BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_ENCODED;
+    }
+
+    public T As<T>()
+    {
+        if (typeof(T) == typeof(DateTime))
+        {
+            switch (Tag)
+            {
+                case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE:
+                case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATETIME:
+                case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME:
+                case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIMESTAMP:
+                    return (T)Value;
+            }
+        }
+
+        if (typeof(T) == typeof(TimeSpan) && Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME)
+            return (T)(dynamic)((DateTime)Value).TimeOfDay;
+
+        if (typeof(T) != typeof(object) && TagFromType(typeof(T)) != Tag)
+            throw new ArgumentException($"Value with tag {Tag} can't be converted to {typeof(T).Name}");
+
+        // ReSharper disable once RedundantCast
+        // This is needed for casting to enums
+        return (T)(dynamic)Value;
+    }
+
+    public override string ToString()
+    {
+        if (Value == null)
+            return string.Empty;
+
+        if (Value.GetType() != typeof(byte[]))
+            return Value.ToString();
+
+        var tmp = (byte[])Value;
+        return tmp.Aggregate(string.Empty, (current, b) =>
+            current + b.ToString("X2"));
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetWritePriority.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetWritePriority.cs
new file mode 100644
index 0000000..29d6c86
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetWritePriority.cs
@@ -0,0 +1,22 @@
+namespace System.IO.BACnet;
+
+public enum BacnetWritePriority
+{
+    NO_PRIORITY = 0,
+    MANUAL_LIFE_SAFETY = 1,
+    AUTOMATIC_LIFE_SAFETY = 2,
+    UNSPECIFIED_LEVEL_3 = 3,
+    UNSPECIFIED_LEVEL_4 = 4,
+    CRITICAL_EQUIPMENT_CONTROL = 5,
+    MINIMUM_ON_OFF = 6,
+    UNSPECIFIED_LEVEL_7 = 7,
+    MANUAL_OPERATOR = 8,
+    UNSPECIFIED_LEVEL_9 = 9,
+    UNSPECIFIED_LEVEL_10 = 10,
+    UNSPECIFIED_LEVEL_11 = 11,
+    UNSPECIFIED_LEVEL_12 = 12,
+    UNSPECIFIED_LEVEL_13 = 13,
+    UNSPECIFIED_LEVEL_14 = 14,
+    UNSPECIFIED_LEVEL_15 = 15,
+    LOWEST_AND_DEFAULT = 16
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetweekNDay.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetweekNDay.cs
new file mode 100644
index 0000000..c7a92ec
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/BacnetweekNDay.cs
@@ -0,0 +1,71 @@
+namespace System.IO.BACnet;
+
+public struct BacnetweekNDay : ASN1.IEncode, ASN1.IDecode
+{
+    public byte month;  /* 1 January, 13 Odd, 14 Even, 255 Any */
+    public byte week;   /* Don't realy understand ??? 1 for day 1 to 7, 2 for ... what's the objective ?  boycott it*/
+    public byte wday;   /* 1=Monday-7=Sunday, 255 any */
+
+    public BacnetweekNDay(byte day, byte month, byte week = 255)
+    {
+        wday = day;
+        this.month = month;
+        this.week = week;
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        buffer.Add(month);
+        buffer.Add(week);
+        buffer.Add(wday);
+    }
+
+    public int Decode(byte[] buffer, int offset, uint count)
+    {
+        month = buffer[offset++];
+        week = buffer[offset++];
+        wday = buffer[offset];
+        return 3;
+    }
+
+    private static string GetDayName(int day)
+    {
+        if (day == 7)
+            day = 0;
+
+        return CultureInfo.CurrentCulture.DateTimeFormat.DayNames[day];
+    }
+
+    public override string ToString()
+    {
+        string ret = wday != 255 ? GetDayName(wday) : "Every days";
+
+        if (month != 255)
+            ret += " on " + CultureInfo.CurrentCulture.DateTimeFormat.MonthNames[month - 1];
+        else
+            ret += " on every month";
+
+        return ret;
+    }
+
+    public bool IsAFittingDate(DateTime date)
+    {
+        if (date.Month != month && month != 255 && month != 13 && month != 14)
+            return false;
+        if (month == 13 && (date.Month & 1) != 1)
+            return false;
+        if (month == 14 && (date.Month & 1) == 1)
+            return false;
+
+        // What about week, too much stupid : boycott it !
+
+        if (wday == 255)
+            return true;
+        if (wday == 7 && date.DayOfWeek == 0)  // Sunday 7 for Bacnet, 0 for .NET
+            return true;
+        if (wday == (int)date.DayOfWeek)
+            return true;
+
+        return false;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/DeviceReportingRecipient.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/DeviceReportingRecipient.cs
new file mode 100644
index 0000000..4ca99d4
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/DeviceReportingRecipient.cs
@@ -0,0 +1,84 @@
+namespace System.IO.BACnet;
+
+public struct DeviceReportingRecipient : ASN1.IEncode
+{
+    public BacnetBitString WeekofDay;
+    public DateTime toTime, fromTime;
+
+    public BacnetObjectId Id;
+    public BacnetAddress adr;
+
+    public uint processIdentifier;
+    public bool Ack_Required;
+    public BacnetBitString evenType;
+
+    public DeviceReportingRecipient(BacnetValue v0, BacnetValue v1, BacnetValue v2, BacnetValue v3, BacnetValue v4, BacnetValue v5, BacnetValue v6)
+    {
+        Id = new BacnetObjectId();
+        adr = null;
+
+        WeekofDay = (BacnetBitString)v0.Value;
+        fromTime = (DateTime)v1.Value;
+        toTime = (DateTime)v2.Value;
+        if (v3.Value is BacnetObjectId id)
+        {
+            Id = id;
+        }
+        else
+        {
+            var netdescr = (BacnetValue[])v3.Value;
+            var s = (ushort)(uint)netdescr[0].Value;
+            var b = (byte[])netdescr[1].Value;
+            adr = new BacnetAddress(BacnetAddressTypes.IP, s, b);
+        }
+        processIdentifier = (uint)v4.Value;
+        Ack_Required = (bool)v5.Value;
+        evenType = (BacnetBitString)v6.Value;
+    }
+
+    public DeviceReportingRecipient(BacnetBitString weekofDay, DateTime fromTime, DateTime toTime, BacnetObjectId id, uint processIdentifier, bool ackRequired, BacnetBitString evenType)
+    {
+        adr = null;
+
+        WeekofDay = weekofDay;
+        this.toTime = toTime;
+        this.fromTime = fromTime;
+        Id = id;
+        this.processIdentifier = processIdentifier;
+        Ack_Required = ackRequired;
+        this.evenType = evenType;
+    }
+
+    public DeviceReportingRecipient(BacnetBitString weekofDay, DateTime fromTime, DateTime toTime, BacnetAddress adr, uint processIdentifier, bool ackRequired, BacnetBitString evenType)
+    {
+        Id = new BacnetObjectId();
+        WeekofDay = weekofDay;
+        this.toTime = toTime;
+        this.fromTime = fromTime;
+        this.adr = adr;
+        this.processIdentifier = processIdentifier;
+        Ack_Required = ackRequired;
+        this.evenType = evenType;
+    }
+
+    public void Encode(EncodeBuffer buffer)
+    {
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(WeekofDay));
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME, fromTime));
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME, toTime));
+
+        if (adr != null)
+        {
+            adr.Encode(buffer);
+        }
+        else
+        {
+            // BacnetObjectId is context specific encoded
+            ASN1.encode_context_object_id(buffer, 0, Id.type, Id.instance);
+        }
+
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(processIdentifier));
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(Ack_Required));
+        ASN1.bacapp_encode_application_data(buffer, new BacnetValue(evenType));
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetBackupState.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetBackupState.cs
new file mode 100644
index 0000000..9377ab3
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetBackupState.cs
@@ -0,0 +1,10 @@
+namespace System.IO.BACnet;
+
+public enum BacnetBackupState
+{
+    IDLE = 0,
+    PREPARING_FOR_BACKUP = 1,
+    PREPARING_FOR_RESTORE = 2,
+    PERFORMING_A_BACKUP = 3,
+    PERFORMING_A_RESTORE = 4
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetCOVTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetCOVTypes.cs
new file mode 100644
index 0000000..39d27fe
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetCOVTypes.cs
@@ -0,0 +1,7 @@
+namespace System.IO.BACnet;
+
+public enum BacnetCOVTypes
+{
+    CHANGE_OF_VALUE_BITS,
+    CHANGE_OF_VALUE_REAL
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventEnable.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventEnable.cs
new file mode 100644
index 0000000..fc02ce7
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventEnable.cs
@@ -0,0 +1,8 @@
+namespace System.IO.BACnet;
+
+public enum BacnetEventEnable
+{
+    EVENT_ENABLE_TO_OFFNORMAL = 1,
+    EVENT_ENABLE_TO_FAULT = 2,
+    EVENT_ENABLE_TO_NORMAL = 4
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventStates.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventStates.cs
new file mode 100644
index 0000000..3630637
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventStates.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet;
+
+public enum BacnetEventStates
+{
+    EVENT_STATE_NORMAL = 0,
+    EVENT_STATE_FAULT = 1,
+    EVENT_STATE_OFFNORMAL = 2,
+    EVENT_STATE_HIGH_LIMIT = 3,
+    EVENT_STATE_LOW_LIMIT = 4,
+    EVENT_STATE_LIFE_SAFETY_ALARM = 5
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventTypes.cs
new file mode 100644
index 0000000..9719c2b
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetEventTypes.cs
@@ -0,0 +1,40 @@
+namespace System.IO.BACnet;
+
+public enum BacnetEventTypes
+{
+    EVENT_CHANGE_OF_BITSTRING = 0,
+    EVENT_CHANGE_OF_STATE = 1,
+    EVENT_CHANGE_OF_VALUE = 2,
+    EVENT_COMMAND_FAILURE = 3,
+    EVENT_FLOATING_LIMIT = 4,
+    EVENT_OUT_OF_RANGE = 5,
+    /*  complex-event-type        (6), -- see comment below */
+    /*  event-buffer-ready   (7), -- context tag 7 is deprecated */
+    EVENT_CHANGE_OF_LIFE_SAFETY = 8,
+    EVENT_EXTENDED = 9,
+    EVENT_BUFFER_READY = 10,
+    EVENT_UNSIGNED_RANGE = 11,
+    /* -- enumeration value 12 is reserved for future addenda */
+    EVENT_ACCESS_EVENT = 13,
+    EVENT_DOUBLE_OUT_OF_RANGE = 14,
+    EVENT_SIGNED_OUT_OF_RANGE = 15,
+    EVENT_UNSIGNED_OUT_OF_RANGE = 16,
+    EVENT_CHANGE_OF_CHARACTERSTRING = 17,
+    EVENT_CHANGE_OF_STATUS_FLAGS = 18,
+    EVENT_CHANGE_OF_RELIABILITY = 19,
+    EVENT_NONE = 20,
+    EVENT_CHANGE_OF_DISCRETE_VALUE = 21,
+    EVENT_CHANGE_OF_TIMER = 22,
+    /* Enumerated values 0-63 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 64-65535 may be used by others subject to  */
+    /* the procedures and constraints described in Clause 23.  */
+    /* It is expected that these enumerated values will correspond to  */
+    /* the use of the complex-event-type CHOICE [6] of the  */
+    /* BACnetNotificationParameters production. */
+    /* The last enumeration used in this version is 11. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    EVENT_PROPRIETARY_MIN = 64,
+    EVENT_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetFileAccessMethod.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetFileAccessMethod.cs
new file mode 100644
index 0000000..da4ea15
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetFileAccessMethod.cs
@@ -0,0 +1,7 @@
+namespace System.IO.BACnet;
+
+public enum BacnetFileAccessMethod
+{
+    RECORD_ACCESS = 0,
+    STREAM_ACCESS = 1
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyModes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyModes.cs
new file mode 100644
index 0000000..e2ff5d4
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyModes.cs
@@ -0,0 +1,30 @@
+namespace System.IO.BACnet;
+
+public enum BacnetLifeSafetyModes
+{
+    MIN_LIFE_SAFETY_MODE = 0,
+    LIFE_SAFETY_MODE_OFF = 0,
+    LIFE_SAFETY_MODE_ON = 1,
+    LIFE_SAFETY_MODE_TEST = 2,
+    LIFE_SAFETY_MODE_MANNED = 3,
+    LIFE_SAFETY_MODE_UNMANNED = 4,
+    LIFE_SAFETY_MODE_ARMED = 5,
+    LIFE_SAFETY_MODE_DISARMED = 6,
+    LIFE_SAFETY_MODE_PREARMED = 7,
+    LIFE_SAFETY_MODE_SLOW = 8,
+    LIFE_SAFETY_MODE_FAST = 9,
+    LIFE_SAFETY_MODE_DISCONNECTED = 10,
+    LIFE_SAFETY_MODE_ENABLED = 11,
+    LIFE_SAFETY_MODE_DISABLED = 12,
+    LIFE_SAFETY_MODE_AUTOMATIC_RELEASE_DISABLED = 13,
+    LIFE_SAFETY_MODE_DEFAULT = 14,
+    MAX_LIFE_SAFETY_MODE = 15,
+    /* Enumerated values 0-255 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 256-65535 may be used by others subject to  */
+    /* procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    LIFE_SAFETY_MODE_PROPRIETARY_MIN = 256,
+    LIFE_SAFETY_MODE_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyOperations.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyOperations.cs
new file mode 100644
index 0000000..9e968bb
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyOperations.cs
@@ -0,0 +1,23 @@
+namespace System.IO.BACnet;
+
+public enum BacnetLifeSafetyOperations
+{
+    LIFE_SAFETY_OP_NONE = 0,
+    LIFE_SAFETY_OP_SILENCE = 1,
+    LIFE_SAFETY_OP_SILENCE_AUDIBLE = 2,
+    LIFE_SAFETY_OP_SILENCE_VISUAL = 3,
+    LIFE_SAFETY_OP_RESET = 4,
+    LIFE_SAFETY_OP_RESET_ALARM = 5,
+    LIFE_SAFETY_OP_RESET_FAULT = 6,
+    LIFE_SAFETY_OP_UNSILENCE = 7,
+    LIFE_SAFETY_OP_UNSILENCE_AUDIBLE = 8,
+    LIFE_SAFETY_OP_UNSILENCE_VISUAL = 9,
+    /* Enumerated values 0-63 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 64-65535 may be used by others subject to  */
+    /* procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    LIFE_SAFETY_OP_PROPRIETARY_MIN = 64,
+    LIFE_SAFETY_OP_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyStates.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyStates.cs
new file mode 100644
index 0000000..78c73ac
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLifeSafetyStates.cs
@@ -0,0 +1,39 @@
+namespace System.IO.BACnet;
+
+public enum BacnetLifeSafetyStates
+{
+    MIN_LIFE_SAFETY_STATE = 0,
+    LIFE_SAFETY_STATE_QUIET = 0,
+    LIFE_SAFETY_STATE_PRE_ALARM = 1,
+    LIFE_SAFETY_STATE_ALARM = 2,
+    LIFE_SAFETY_STATE_FAULT = 3,
+    LIFE_SAFETY_STATE_FAULT_PRE_ALARM = 4,
+    LIFE_SAFETY_STATE_FAULT_ALARM = 5,
+    LIFE_SAFETY_STATE_NOT_READY = 6,
+    LIFE_SAFETY_STATE_ACTIVE = 7,
+    LIFE_SAFETY_STATE_TAMPER = 8,
+    LIFE_SAFETY_STATE_TEST_ALARM = 9,
+    LIFE_SAFETY_STATE_TEST_ACTIVE = 10,
+    LIFE_SAFETY_STATE_TEST_FAULT = 11,
+    LIFE_SAFETY_STATE_TEST_FAULT_ALARM = 12,
+    LIFE_SAFETY_STATE_HOLDUP = 13,
+    LIFE_SAFETY_STATE_DURESS = 14,
+    LIFE_SAFETY_STATE_TAMPER_ALARM = 15,
+    LIFE_SAFETY_STATE_ABNORMAL = 16,
+    LIFE_SAFETY_STATE_EMERGENCY_POWER = 17,
+    LIFE_SAFETY_STATE_DELAYED = 18,
+    LIFE_SAFETY_STATE_BLOCKED = 19,
+    LIFE_SAFETY_STATE_LOCAL_ALARM = 20,
+    LIFE_SAFETY_STATE_GENERAL_ALARM = 21,
+    LIFE_SAFETY_STATE_SUPERVISORY = 22,
+    LIFE_SAFETY_STATE_TEST_SUPERVISORY = 23,
+    MAX_LIFE_SAFETY_STATE = 24,
+    /* Enumerated values 0-255 are reserved for definition by ASHRAE.  */
+    /* Enumerated values 256-65535 may be used by others subject to  */
+    /* procedures and constraints described in Clause 23. */
+    /* do the max range inside of enum so that
+       compilers will allocate adequate sized datatype for enum
+       which is used to store decoding */
+    LIFE_SAFETY_STATE_PROPRIETARY_MIN = 256,
+    LIFE_SAFETY_STATE_PROPRIETARY_MAX = 65535
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLimitEnable.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLimitEnable.cs
new file mode 100644
index 0000000..21cc118
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetLimitEnable.cs
@@ -0,0 +1,7 @@
+namespace System.IO.BACnet;
+
+public enum BacnetLimitEnable
+{
+    EVENT_LOW_LIMIT_ENABLE = 1,
+    EVENT_HIGH_LIMIT_ENABLE = 2
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetNotifyTypes.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetNotifyTypes.cs
new file mode 100644
index 0000000..b1eda1f
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Base/Enums/BacnetNotifyTypes.cs
@@ -0,0 +1,8 @@
+namespace System.IO.BACnet;
+
+public enum BacnetNotifyTypes
+{
+    NOTIFY_ALARM = 0,
+    NOTIFY_EVENT = 1,
+    NOTIFY_ACK_NOTIFICATION = 2
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/GlobalUsings.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/GlobalUsings.cs
new file mode 100644
index 0000000..ad05b8e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/GlobalUsings.cs
@@ -0,0 +1,21 @@
+global using Common.Logging;
+global using PacketDotNet;
+global using SharpPcap;
+global using SharpPcap.LibPcap;
+global using System.Collections.Generic;
+global using System.Globalization;
+global using System.IO.BACnet.Base;
+global using System.IO.BACnet.Serialize;
+global using System.IO.Pipes;
+global using System.IO.Ports;
+global using System.Linq;
+global using System.Net;
+global using System.Net.NetworkInformation;
+global using System.Net.Sockets;
+global using System.Reflection;
+global using System.Runtime.InteropServices;
+global using System.Text;
+global using System.Text.RegularExpressions;
+global using System.Threading;
+global using System.Threading.Tasks;
+global using System.Xml.Serialization;
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Helpers/BacnetValuesExtensions.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Helpers/BacnetValuesExtensions.cs
new file mode 100644
index 0000000..ddefad0
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Helpers/BacnetValuesExtensions.cs
@@ -0,0 +1,64 @@
+namespace System.IO.BACnet.Helpers;
+
+public static class BacnetValuesExtensions
+{
+    public static bool Has(this IList<BacnetPropertyValue> propertyValues, BacnetPropertyIds propertyId)
+    {
+        if (propertyValues.All(v => v.property.GetPropertyId() != propertyId))
+            return false;
+
+        return propertyValues
+            .Where(v => v.property.GetPropertyId() == propertyId)
+            .Any(v => !v.value.HasError());
+    }
+
+    public static bool HasError(this IList<BacnetPropertyValue> propertyValues, BacnetErrorCodes error)
+    {
+        return propertyValues
+            .SelectMany(p => p.value)
+            .Where(v => v.Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR)
+            .Any(v => v.As<BacnetError>().error_code == error);
+    }
+
+    public static bool HasError(this IList<BacnetPropertyValue> propertyValues)
+    {
+        return propertyValues.Any(p => p.value.HasError());
+    }
+
+    public static bool HasError(this IList<BacnetValue> values)
+    {
+        return values.Any(v => v.Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR);
+    }
+
+    public static object Get(this IList<BacnetPropertyValue> propertyValues, BacnetPropertyIds propertyId)
+    {
+        return Get<object>(propertyValues, propertyId);
+    }
+
+    public static T Get<T>(this IList<BacnetPropertyValue> propertyValues, BacnetPropertyIds propertyId)
+    {
+        return GetMany<T>(propertyValues, propertyId).FirstOrDefault();
+    }
+
+    public static T[] GetMany<T>(this IList<BacnetPropertyValue> propertyValues, BacnetPropertyIds propertyId)
+    {
+        if (!propertyValues.Has(propertyId))
+            return new T[0];
+
+        var property = propertyValues.First(v => v.property.GetPropertyId() == propertyId);
+
+        return property.property.propertyArrayIndex == ASN1.BACNET_ARRAY_ALL
+            ? property.value.GetMany<T>()
+            : new[] { property.value[(int)property.property.propertyArrayIndex].As<T>() };
+    }
+
+    public static T[] GetMany<T>(this IList<BacnetValue> values)
+    {
+        return values.Select(v => v.As<T>()).ToArray();
+    }
+
+    public static T Get<T>(this IList<BacnetValue> values)
+    {
+        return GetMany<T>(values).FirstOrDefault();
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/APDU.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/APDU.cs
new file mode 100644
index 0000000..7c8546e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/APDU.cs
@@ -0,0 +1,217 @@
+namespace System.IO.BACnet.Serialize;
+
+public class APDU
+{
+    public static BacnetPduTypes GetDecodedType(byte[] buffer, int offset)
+    {
+        return (BacnetPduTypes)buffer[offset];
+    }
+
+    public static void SetDecodedType(byte[] buffer, int offset, BacnetPduTypes type)
+    {
+        buffer[offset] = (byte)type;
+    }
+
+    public static int GetDecodedInvokeId(byte[] buffer, int offset)
+    {
+        var type = GetDecodedType(buffer, offset);
+        switch (type & BacnetPduTypes.PDU_TYPE_MASK)
+        {
+            case BacnetPduTypes.PDU_TYPE_SIMPLE_ACK:
+            case BacnetPduTypes.PDU_TYPE_COMPLEX_ACK:
+            case BacnetPduTypes.PDU_TYPE_ERROR:
+            case BacnetPduTypes.PDU_TYPE_REJECT:
+            case BacnetPduTypes.PDU_TYPE_ABORT:
+                return buffer[offset + 1];
+            case BacnetPduTypes.PDU_TYPE_CONFIRMED_SERVICE_REQUEST:
+                return buffer[offset + 2];
+            default:
+                return -1;
+        }
+    }
+
+    public static void EncodeConfirmedServiceRequest(EncodeBuffer buffer, BacnetPduTypes type, BacnetConfirmedServices service, BacnetMaxSegments maxSegments,
+        BacnetMaxAdpu maxAdpu, byte invokeId, byte sequenceNumber = 0, byte proposedWindowSize = 0)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = (byte)((byte)maxSegments | (byte)maxAdpu);
+        buffer.buffer[buffer.offset++] = invokeId;
+
+        if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) > 0)
+        {
+            buffer.buffer[buffer.offset++] = sequenceNumber;
+            buffer.buffer[buffer.offset++] = proposedWindowSize;
+        }
+        buffer.buffer[buffer.offset++] = (byte)service;
+    }
+
+    public static int DecodeConfirmedServiceRequest(byte[] buffer, int offset, out BacnetPduTypes type, out BacnetConfirmedServices service,
+        out BacnetMaxSegments maxSegments, out BacnetMaxAdpu maxAdpu, out byte invokeId, out byte sequenceNumber, out byte proposedWindowNumber)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        maxSegments = (BacnetMaxSegments)(buffer[offset] & 0xF0);
+        maxAdpu = (BacnetMaxAdpu)(buffer[offset++] & 0x0F);
+        invokeId = buffer[offset++];
+
+        sequenceNumber = 0;
+        proposedWindowNumber = 0;
+        if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) > 0)
+        {
+            sequenceNumber = buffer[offset++];
+            proposedWindowNumber = buffer[offset++];
+        }
+        service = (BacnetConfirmedServices)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeUnconfirmedServiceRequest(EncodeBuffer buffer, BacnetPduTypes type, BacnetUnconfirmedServices service)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = (byte)service;
+    }
+
+    public static int DecodeUnconfirmedServiceRequest(byte[] buffer, int offset, out BacnetPduTypes type, out BacnetUnconfirmedServices service)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        service = (BacnetUnconfirmedServices)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeSimpleAck(EncodeBuffer buffer, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = invokeId;
+        buffer.buffer[buffer.offset++] = (byte)service;
+    }
+
+    public static int DecodeSimpleAck(byte[] buffer, int offset, out BacnetPduTypes type, out BacnetConfirmedServices service, out byte invokeId)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        invokeId = buffer[offset++];
+        service = (BacnetConfirmedServices)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static int EncodeComplexAck(EncodeBuffer buffer, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId, byte sequenceNumber = 0, byte proposedWindowNumber = 0)
+    {
+        var len = 3;
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = invokeId;
+        if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) > 0)
+        {
+            buffer.buffer[buffer.offset++] = sequenceNumber;
+            buffer.buffer[buffer.offset++] = proposedWindowNumber;
+            len += 2;
+        }
+        buffer.buffer[buffer.offset++] = (byte)service;
+        return len;
+    }
+
+    public static int DecodeComplexAck(byte[] buffer, int offset, out BacnetPduTypes type, out BacnetConfirmedServices service, out byte invokeId,
+        out byte sequenceNumber, out byte proposedWindowNumber)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        invokeId = buffer[offset++];
+
+        sequenceNumber = 0;
+        proposedWindowNumber = 0;
+        if ((type & BacnetPduTypes.SEGMENTED_MESSAGE) > 0)
+        {
+            sequenceNumber = buffer[offset++];
+            proposedWindowNumber = buffer[offset++];
+        }
+        service = (BacnetConfirmedServices)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeSegmentAck(EncodeBuffer buffer, BacnetPduTypes type, byte originalInvokeId, byte sequenceNumber, byte actualWindowSize)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = originalInvokeId;
+        buffer.buffer[buffer.offset++] = sequenceNumber;
+        buffer.buffer[buffer.offset++] = actualWindowSize;
+    }
+
+    public static int DecodeSegmentAck(byte[] buffer, int offset, out BacnetPduTypes type, out byte originalInvokeId, out byte sequenceNumber, out byte actualWindowSize)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        originalInvokeId = buffer[offset++];
+        sequenceNumber = buffer[offset++];
+        actualWindowSize = buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeError(EncodeBuffer buffer, BacnetPduTypes type, BacnetConfirmedServices service, byte invokeId)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = invokeId;
+        buffer.buffer[buffer.offset++] = (byte)service;
+    }
+
+    public static int DecodeError(byte[] buffer, int offset, out BacnetPduTypes type, out BacnetConfirmedServices service, out byte invokeId)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        invokeId = buffer[offset++];
+        service = (BacnetConfirmedServices)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeAbort(EncodeBuffer buffer, BacnetPduTypes type, byte invokeId, BacnetAbortReason reason)
+    {
+        EncodeAbortOrReject(buffer, type, invokeId, reason);
+    }
+
+    public static void EncodeReject(EncodeBuffer buffer, BacnetPduTypes type, byte invokeId, BacnetRejectReason reason)
+    {
+        EncodeAbortOrReject(buffer, type, invokeId, reason);
+    }
+
+    private static void EncodeAbortOrReject(EncodeBuffer buffer, BacnetPduTypes type, byte invokeId, dynamic reason)
+    {
+        buffer.buffer[buffer.offset++] = (byte)type;
+        buffer.buffer[buffer.offset++] = invokeId;
+        buffer.buffer[buffer.offset++] = (byte)reason;
+    }
+
+    public static int DecodeAbort(byte[] buffer, int offset, out BacnetPduTypes type,
+        out byte invokeId, out BacnetAbortReason reason)
+    {
+        return DecodeAbortOrReject(buffer, offset, out type, out invokeId, out reason);
+    }
+
+    public static int DecodeReject(byte[] buffer, int offset, out BacnetPduTypes type,
+        out byte invokeId, out BacnetRejectReason reason)
+    {
+        return DecodeAbortOrReject(buffer, offset, out type, out invokeId, out reason);
+    }
+
+    private static int DecodeAbortOrReject<TReason>(byte[] buffer, int offset,
+        out BacnetPduTypes type, out byte invokeId, out TReason reason)
+    {
+        var orgOffset = offset;
+
+        type = (BacnetPduTypes)buffer[offset++];
+        invokeId = buffer[offset++];
+        reason = (TReason)(dynamic)buffer[offset++];
+
+        return offset - orgOffset;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/ASN1.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/ASN1.cs
new file mode 100644
index 0000000..5177796
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/ASN1.cs
@@ -0,0 +1,2486 @@
+namespace System.IO.BACnet.Serialize;
+
+public class ASN1
+{
+    public const int BACNET_MAX_OBJECT = 0x3FF;
+    public const int BACNET_INSTANCE_BITS = 22;
+    public const int BACNET_MAX_INSTANCE = 0x3FFFFF;
+    public const int MAX_BITSTRING_BYTES = 15;
+    public const uint BACNET_ARRAY_ALL = 0xFFFFFFFFU;
+    public const uint BACNET_NO_PRIORITY = 0;
+    public const uint BACNET_MIN_PRIORITY = 1;
+    public const uint BACNET_MAX_PRIORITY = 16;
+
+    /// <summary>
+    /// You can provide a function to resolve a given tag within a property to a different tag (e.g. for custom properties)
+    /// The address of the remote device is provided so that you can support devices from multiple vendors
+    /// (the same custom property# has different meaning for each vendor)
+    /// </summary>
+    public static Func<BacnetAddress, BacnetPropertyIds, byte, BacnetApplicationTags> CustomTagResolver;
+
+    public interface IEncode
+    {
+        void Encode(EncodeBuffer buffer);
+    }
+
+    public interface IDecode
+    {
+        int Decode(byte[] buffer, int offset, uint count);
+    }
+
+    public static void encode_bacnet_object_id(EncodeBuffer buffer, BacnetObjectTypes objectType, uint instance)
+    {
+        var type = (uint)objectType;
+        var value = ((type & BACNET_MAX_OBJECT) << BACNET_INSTANCE_BITS) | (instance & BACNET_MAX_INSTANCE);
+        encode_unsigned32(buffer, value);
+    }
+
+    public static void encode_tag(EncodeBuffer buffer, byte tagNumber, bool contextSpecific, uint lenValueType)
+    {
+        var len = 1;
+        var tmp = new byte[3];
+
+        tmp[0] = 0;
+        if (contextSpecific) tmp[0] |= 0x8;
+
+        /* additional tag byte after this byte */
+        /* for extended tag byte */
+        if (tagNumber <= 14)
+        {
+            tmp[0] |= (byte)(tagNumber << 4);
+        }
+        else
+        {
+            tmp[0] |= 0xF0;
+            tmp[1] = tagNumber;
+            len++;
+        }
+
+        /* NOTE: additional len byte(s) after extended tag byte */
+        /* if larger than 4 */
+        if (lenValueType <= 4)
+        {
+            tmp[0] |= (byte)lenValueType;
+            buffer.Add(tmp, len);
+        }
+        else
+        {
+            tmp[0] |= 5;
+            if (lenValueType <= 253)
+            {
+                tmp[len++] = (byte)lenValueType;
+                buffer.Add(tmp, len);
+            }
+            else if (lenValueType <= 65535)
+            {
+                tmp[len++] = 254;
+                buffer.Add(tmp, len);
+                encode_unsigned16(buffer, (ushort)lenValueType);
+            }
+            else
+            {
+                tmp[len++] = 255;
+                buffer.Add(tmp, len);
+                encode_unsigned32(buffer, lenValueType);
+            }
+        }
+    }
+
+    public static void encode_bacnet_enumerated(EncodeBuffer buffer, uint value)
+    {
+        encode_bacnet_unsigned(buffer, value);
+    }
+
+    public static void encode_application_object_id(EncodeBuffer buffer, BacnetObjectTypes objectType, uint instance)
+    {
+        var tmp1 = new EncodeBuffer();
+        encode_bacnet_object_id(tmp1, objectType, instance);
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID, false, (uint)tmp1.offset);
+        buffer.Add(tmp1.buffer, tmp1.offset);
+    }
+
+    public static void encode_application_unsigned(EncodeBuffer buffer, uint value)
+    {
+        var tmp1 = new EncodeBuffer();
+        encode_bacnet_unsigned(tmp1, value);
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT, false, (uint)tmp1.offset);
+        buffer.Add(tmp1.buffer, tmp1.offset);
+    }
+
+    public static void encode_application_enumerated(EncodeBuffer buffer, uint value)
+    {
+        var tmp1 = new EncodeBuffer();
+        encode_bacnet_enumerated(tmp1, value);
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED, false, (uint)tmp1.offset);
+        buffer.Add(tmp1.buffer, tmp1.offset);
+    }
+
+    public static void encode_application_signed(EncodeBuffer buffer, int value)
+    {
+        var tmp1 = new EncodeBuffer();
+        encode_bacnet_signed(tmp1, value);
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT, false, (uint)tmp1.offset);
+        buffer.Add(tmp1.buffer, tmp1.offset);
+    }
+
+    public static void encode_bacnet_unsigned(EncodeBuffer buffer, uint value)
+    {
+        if (value < 0x100)
+        {
+            buffer.Add((byte)value);
+        }
+        else if (value < 0x10000)
+        {
+            encode_unsigned16(buffer, (ushort)value);
+        }
+        else if (value < 0x1000000)
+        {
+            encode_unsigned24(buffer, value);
+        }
+        else
+        {
+            encode_unsigned32(buffer, value);
+        }
+    }
+
+    public static void encode_context_boolean(EncodeBuffer buffer, byte tagNumber, bool boolean_value)
+    {
+        encode_tag(buffer, tagNumber, true, 1);
+        buffer.Add(boolean_value ? (byte)1 : (byte)0);
+    }
+
+    public static void encode_context_real(EncodeBuffer buffer, byte tagNumber, float value)
+    {
+        encode_tag(buffer, tagNumber, true, 4);
+        encode_bacnet_real(buffer, value);
+    }
+
+    public static void encode_context_unsigned(EncodeBuffer buffer, byte tagNumber, uint value)
+    {
+        int len;
+
+        /* length of unsigned is variable, as per 20.2.4 */
+        if (value < 0x100)
+            len = 1;
+        else if (value < 0x10000)
+            len = 2;
+        else if (value < 0x1000000)
+            len = 3;
+        else
+            len = 4;
+
+        encode_tag(buffer, tagNumber, true, (uint)len);
+        encode_bacnet_unsigned(buffer, value);
+    }
+
+    public static void encode_context_character_string(EncodeBuffer buffer, byte tagNumber, string value)
+    {
+        var tmp = new EncodeBuffer();
+        encode_bacnet_character_string(tmp, value);
+
+        encode_tag(buffer, tagNumber, true, (uint)tmp.offset);
+        buffer.Add(tmp.buffer, tmp.offset);
+    }
+
+    public static void encode_context_enumerated(EncodeBuffer buffer, byte tagNumber, uint value)
+    {
+        int len; /* return value */
+
+        if (value < 0x100)
+            len = 1;
+        else if (value < 0x10000)
+            len = 2;
+        else if (value < 0x1000000)
+            len = 3;
+        else
+            len = 4;
+
+        encode_tag(buffer, tagNumber, true, (uint)len);
+        encode_bacnet_enumerated(buffer, value);
+    }
+
+    public static void encode_bacnet_signed(EncodeBuffer buffer, long value)
+    {
+        /* don't encode the leading X'FF' or X'00' of the two's compliment.
+           That is, the first octet of any multi-octet encoded value shall
+           not be X'00' if the most significant bit (bit 7) of the second
+           octet is 0, and the first octet shall not be X'FF' if the most
+           significant bit of the second octet is 1. */
+        if (value >= -128 && value < 128)
+            buffer.Add((byte)(sbyte)value);
+        else if (value >= -32768 && value < 32768)
+            encode_signed16(buffer, (short)value);
+        else if (value > -8388607 && value < 8388608)
+            encode_signed24(buffer, (int)value);
+        else if (value > -2147483648 && value < 2147483648)
+            encode_signed32(buffer, (int)value);
+        else
+            encode_signed64(buffer, value);
+    }
+
+    public static void encode_octetString(EncodeBuffer buffer, byte[] octetString, int octetOffset, int octetCount)
+    {
+        if (octetString != null)
+        {
+            for (var i = octetOffset; i < octetOffset + octetCount; i++)
+                buffer.Add(octetString[i]);
+        }
+    }
+
+    public static void encode_application_octet_string(EncodeBuffer buffer, byte[] octetString, int octetOffset, int octetCount)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING, false, (uint)octetCount);
+        encode_octetString(buffer, octetString, octetOffset, octetCount);
+    }
+
+    public static void encode_application_boolean(EncodeBuffer buffer, bool booleanValue)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN, false,
+            booleanValue ? 1 : (uint)0);
+    }
+
+    public static void encode_bacnet_real(EncodeBuffer buffer, float value)
+    {
+        var data = BitConverter.GetBytes(value);
+        buffer.Add(data[3]);
+        buffer.Add(data[2]);
+        buffer.Add(data[1]);
+        buffer.Add(data[0]);
+    }
+
+    public static void encode_bacnet_double(EncodeBuffer buffer, double value)
+    {
+        var data = BitConverter.GetBytes(value);
+        buffer.Add(data[7]);
+        buffer.Add(data[6]);
+        buffer.Add(data[5]);
+        buffer.Add(data[4]);
+        buffer.Add(data[3]);
+        buffer.Add(data[2]);
+        buffer.Add(data[1]);
+        buffer.Add(data[0]);
+    }
+
+    public static void encode_application_real(EncodeBuffer buffer, float value)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL, false, 4);
+        encode_bacnet_real(buffer, value);
+    }
+
+    public static void encode_application_double(EncodeBuffer buffer, double value)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE, false, 8);
+        encode_bacnet_double(buffer, value);
+    }
+
+    private static byte bitstring_bytesUsed(BacnetBitString bitString)
+    {
+        byte len = 0; /* return value */
+
+        if (bitString.bits_used <= 0)
+            return len;
+
+        var lastBit = (byte)(bitString.bits_used - 1);
+        var usedBytes = (byte)(lastBit / 8);
+        /* add one for the first byte */
+        usedBytes++;
+        len = usedBytes;
+
+        return len;
+    }
+
+    private static byte byte_reverse_bits(byte inByte)
+    {
+        byte outByte = 0;
+
+        if ((inByte & 1) > 0)
+        {
+            outByte |= 0x80;
+        }
+        if ((inByte & 2) > 0)
+        {
+            outByte |= 0x40;
+        }
+        if ((inByte & 4) > 0)
+        {
+            outByte |= 0x20;
+        }
+        if ((inByte & 8) > 0)
+        {
+            outByte |= 0x10;
+        }
+        if ((inByte & 16) > 0)
+        {
+            outByte |= 0x8;
+        }
+        if ((inByte & 32) > 0)
+        {
+            outByte |= 0x4;
+        }
+        if ((inByte & 64) > 0)
+        {
+            outByte |= 0x2;
+        }
+        if ((inByte & 128) > 0)
+        {
+            outByte |= 1;
+        }
+
+        return outByte;
+    }
+
+    private static byte bitstring_octet(BacnetBitString bitString, byte octetIndex)
+    {
+        byte octet = 0;
+
+        if (bitString.value == null)
+            return octet;
+
+        if (octetIndex < MAX_BITSTRING_BYTES)
+            octet = bitString.value[octetIndex];
+
+        return octet;
+    }
+
+    public static void encode_bitstring(EncodeBuffer buffer, BacnetBitString bitString)
+    {
+        /* if the bit string is empty, then the first octet shall be zero */
+        if (bitString.bits_used == 0)
+        {
+            buffer.Add(0);
+        }
+        else
+        {
+            var usedBytes = bitstring_bytesUsed(bitString);
+            var remainingUsedBits = (byte)(bitString.bits_used - (usedBytes - 1) * 8);
+            /* number of unused bits in the subsequent final octet */
+            buffer.Add((byte)(8 - remainingUsedBits));
+            for (byte i = 0; i < usedBytes; i++)
+                buffer.Add(byte_reverse_bits(bitstring_octet(bitString, i)));
+        }
+    }
+
+    public static void encode_application_bitstring(EncodeBuffer buffer, BacnetBitString bitString)
+    {
+        uint bitStringEncodedLength = 1; /* 1 for the bits remaining octet */
+
+        /* bit string may use more than 1 octet for the tag, so find out how many */
+        bitStringEncodedLength += bitstring_bytesUsed(bitString);
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING, false, bitStringEncodedLength);
+        encode_bitstring(buffer, bitString);
+    }
+
+    public static void EncodeApplicationDestination(EncodeBuffer buffer, BacnetObjectTypes objectType, uint instance)
+    {
+        var tempBuffer = new EncodeBuffer();
+        encode_bacnet_object_id(tempBuffer, objectType, instance);
+        buffer.Add(0x0C);
+        buffer.Add(tempBuffer.buffer, tempBuffer.offset);
+    }
+
+    public static void EncodeApplicationDestination(EncodeBuffer buffer, BacnetAddress address)
+    {
+        address.Encode(buffer);
+    }
+
+    public static void bacapp_encode_application_data(EncodeBuffer buffer, BacnetValue value)
+    {
+        if (value.Value == null)
+        {
+            // Modif FC
+            buffer.Add((byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL);
+            return;
+        }
+
+        switch (value.Tag)
+        {
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL:
+                /* don't encode anything */
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN:
+                encode_application_boolean(buffer, (bool)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT:
+                encode_application_unsigned(buffer, (uint)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT:
+                encode_application_signed(buffer, (int)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL:
+                encode_application_real(buffer, (float)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE:
+                encode_application_double(buffer, (double)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING:
+                encode_application_octet_string(buffer, (byte[])value.Value, 0, ((byte[])value.Value).Length);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_CHARACTER_STRING:
+                encode_application_character_string(buffer, (string)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING:
+                encode_application_bitstring(buffer, (BacnetBitString)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED:
+                encode_application_enumerated(buffer, (uint)(dynamic)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE:
+                encode_application_date(buffer, (DateTime)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME:
+                encode_application_time(buffer, (DateTime)value.Value);
+                break;
+            // Added for EventTimeStamp
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIMESTAMP:
+                bacapp_encode_timestamp(buffer, (BacnetGenericTime)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATETIME:
+                bacapp_encode_datetime(buffer, (DateTime)value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID:
+                encode_application_object_id(buffer, ((BacnetObjectId)value.Value).type,
+                    ((BacnetObjectId)value.Value).instance);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_COV_SUBSCRIPTION:
+                encode_cov_subscription(buffer, (BacnetCOVSubscription)value.Value);
+                //is this the right way to do it, I wonder?
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_READ_ACCESS_RESULT:
+                encode_read_access_result(buffer, (BacnetReadAccessResult)value.Value);
+                //is this the right way to do it, I wonder?
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_READ_ACCESS_SPECIFICATION:
+                encode_read_access_specification(buffer, (BacnetReadAccessSpecification)value.Value);
+                //is this the right way to do it, I wonder?
+                break;
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DESTINATION:
+                switch (value.Value)
+                {
+                    case BacnetObjectId oid:
+                        EncodeApplicationDestination(buffer, oid.type, oid.instance);
+                        break;
+                    case BacnetAddress address:
+                        EncodeApplicationDestination(buffer, address);
+                        break;
+                    default:
+                        throw new ArgumentException($"Unsupported destination value '{value.Value}' (type {value.GetType()})");
+                }
+                break;
+            default:
+                //context specific
+                if (value.Value is byte[] arr)
+                {
+                    buffer?.Add(arr, arr.Length);
+                }
+                else
+                {
+                    try
+                    {
+                        var oType = value.Value.GetType();
+                        if (oType.IsGenericType && oType.GetGenericTypeDefinition() == typeof(List<>))
+                        {
+                            // last chance to encode a List<object>
+                            var t = (List<object>)value.Value;
+                            foreach (var o in t)
+                                ((IEncode)o).Encode(buffer);
+                        }
+                        else
+                        {
+                            // last chance to encode a value
+                            ((IEncode)value.Value).Encode(buffer);
+                        }
+                    }
+                    catch
+                    {
+                        throw new Exception("I cannot encode this");
+                    }
+                }
+                break;
+        }
+    }
+
+    public static void bacapp_encode_device_obj_property_ref(EncodeBuffer buffer, BacnetDeviceObjectPropertyReference value)
+    {
+        encode_context_object_id(buffer, 0, value.objectIdentifier.type, value.objectIdentifier.instance);
+        encode_context_enumerated(buffer, 1, (uint)value.propertyIdentifier);
+
+        /* Array index is optional so check if needed before inserting */
+        if (value.arrayIndex != BACNET_ARRAY_ALL)
+            encode_context_unsigned(buffer, 2, value.arrayIndex);
+
+        /* Likewise, device id is optional so see if needed
+         * (set type to non device to omit */
+        if (value.deviceIndentifier.type == BacnetObjectTypes.OBJECT_DEVICE)
+            encode_context_object_id(buffer, 3, value.deviceIndentifier.type, value.deviceIndentifier.instance);
+    }
+
+    public static void bacapp_encode_context_device_obj_property_ref(EncodeBuffer buffer, byte tagNumber, BacnetDeviceObjectPropertyReference value)
+    {
+        encode_opening_tag(buffer, tagNumber);
+        bacapp_encode_device_obj_property_ref(buffer, value);
+        encode_closing_tag(buffer, tagNumber);
+    }
+
+    public static void bacapp_encode_property_state(EncodeBuffer buffer, BacnetPropertyState value)
+    {
+        switch (value.tag)
+        {
+            case BacnetPropertyState.BacnetPropertyStateTypes.BOOLEAN_VALUE:
+                encode_context_boolean(buffer, 0, value.state.boolean_value);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.BINARY_VALUE:
+                encode_context_enumerated(buffer, 1, (uint)value.state.binaryValue);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.EVENT_TYPE:
+                encode_context_enumerated(buffer, 2, (uint)value.state.eventType);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.POLARITY:
+                encode_context_enumerated(buffer, 3, (uint)value.state.polarity);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.PROGRAM_CHANGE:
+                encode_context_enumerated(buffer, 4, (uint)value.state.programChange);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.PROGRAM_STATE:
+                encode_context_enumerated(buffer, 5, (uint)value.state.programState);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.REASON_FOR_HALT:
+                encode_context_enumerated(buffer, 6, (uint)value.state.programError);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.RELIABILITY:
+                encode_context_enumerated(buffer, 7, (uint)value.state.reliability);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.STATE:
+                encode_context_enumerated(buffer, 8, (uint)value.state.state);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.SYSTEM_STATUS:
+                encode_context_enumerated(buffer, 9, (uint)value.state.systemStatus);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.UNITS:
+                encode_context_enumerated(buffer, 10, (uint)value.state.units);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.UNSIGNED_VALUE:
+                encode_context_unsigned(buffer, 11, value.state.unsignedValue);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.LIFE_SAFETY_MODE:
+                encode_context_enumerated(buffer, 12, (uint)value.state.lifeSafetyMode);
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.LIFE_SAFETY_STATE:
+                encode_context_enumerated(buffer, 13, (uint)value.state.lifeSafetyState);
+                break;
+
+            default:
+                /* FIXME: assert(0); - return a negative len? */
+                break;
+        }
+    }
+
+    public static void encode_context_bitstring(EncodeBuffer buffer, byte tagNumber, BacnetBitString bitString)
+    {
+        uint bitStringEncodedLength = 1; /* 1 for the bits remaining octet */
+
+        /* bit string may use more than 1 octet for the tag, so find out how many */
+        bitStringEncodedLength += bitstring_bytesUsed(bitString);
+        encode_tag(buffer, tagNumber, true, bitStringEncodedLength);
+        encode_bitstring(buffer, bitString);
+    }
+
+    public static void encode_opening_tag(EncodeBuffer buffer, byte tagNumber)
+    {
+        var len = 1;
+        var tmp = new byte[2];
+
+        /* set class field to context specific */
+        tmp[0] = 0x8;
+        /* additional tag byte after this byte for extended tag byte */
+        if (tagNumber <= 14)
+        {
+            tmp[0] |= (byte)(tagNumber << 4);
+        }
+        else
+        {
+            tmp[0] |= 0xF0;
+            tmp[1] = tagNumber;
+            len++;
+        }
+        /* set type field to opening tag */
+        tmp[0] |= 6;
+
+        buffer.Add(tmp, len);
+    }
+
+    public static void encode_context_signed(EncodeBuffer buffer, byte tagNumber, int value)
+    {
+        int len; /* return value */
+
+        /* length of signed int is variable, as per 20.2.11 */
+        if (value >= -128 && value < 128)
+            len = 1;
+        else if (value >= -32768 && value < 32768)
+            len = 2;
+        else if (value > -8388608 && value < 8388608)
+            len = 3;
+        else
+            len = 4;
+
+        encode_tag(buffer, tagNumber, true, (uint)len);
+        encode_bacnet_signed(buffer, value);
+    }
+
+    public static void encode_context_object_id(EncodeBuffer buffer, byte tagNumber, BacnetObjectTypes objectType, uint instance)
+    {
+        encode_tag(buffer, tagNumber, true, 4);
+        encode_bacnet_object_id(buffer, objectType, instance);
+    }
+
+    public static void encode_closing_tag(EncodeBuffer buffer, byte tagNumber)
+    {
+        var len = 1;
+        var tmp = new byte[2];
+
+        /* set class field to context specific */
+        tmp[0] = 0x8;
+        /* additional tag byte after this byte for extended tag byte */
+        if (tagNumber <= 14)
+        {
+            tmp[0] |= (byte)(tagNumber << 4);
+        }
+        else
+        {
+            tmp[0] |= 0xF0;
+            tmp[1] = tagNumber;
+            len++;
+        }
+        /* set type field to closing tag */
+        tmp[0] |= 7;
+
+        buffer.Add(tmp, len);
+    }
+
+    public static void encode_bacnet_time(EncodeBuffer buffer, DateTime value)
+    {
+        buffer.Add((byte)value.Hour);
+        buffer.Add((byte)value.Minute);
+        buffer.Add((byte)value.Second);
+        buffer.Add((byte)(value.Millisecond / 10));
+    }
+
+    public static void encode_context_time(EncodeBuffer buffer, byte tagNumber, DateTime value)
+    {
+        encode_tag(buffer, tagNumber, true, 4);
+        encode_bacnet_time(buffer, value);
+    }
+
+    public static void encode_bacnet_date(EncodeBuffer buffer, DateTime value)
+    {
+        if (value == new DateTime(1, 1, 1)) // this is the way decode do for 'Date any' = DateTime(0)
+        {
+            buffer.Add(0xFF);
+            buffer.Add(0xFF);
+            buffer.Add(0xFF);
+            buffer.Add(0xFF);
+            return;
+        }
+
+        /* allow 2 digit years */
+        if (value.Year >= 1900)
+            buffer.Add((byte)(value.Year - 1900));
+        else if (value.Year < 0x100)
+            buffer.Add((byte)value.Year);
+        else
+            throw new Exception("Date is rubbish");
+
+        buffer.Add((byte)value.Month);
+        buffer.Add((byte)value.Day);
+        buffer.Add(value.DayOfWeek != DayOfWeek.Sunday
+            ? (byte)value.DayOfWeek
+            : (byte)7);
+    }
+
+    public static void encode_application_date(EncodeBuffer buffer, DateTime value)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE, false, 4);
+        encode_bacnet_date(buffer, value);
+    }
+
+    public static void encode_application_time(EncodeBuffer buffer, DateTime value)
+    {
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME, false, 4);
+        encode_bacnet_time(buffer, value);
+    }
+
+    public static void bacapp_encode_datetime(EncodeBuffer buffer, DateTime value)
+    {
+        if (value != new DateTime(1, 1, 1))
+        {
+            encode_application_date(buffer, value);
+            encode_application_time(buffer, value);
+        }
+    }
+
+    public static void bacapp_encode_context_datetime(EncodeBuffer buffer, byte tagNumber, DateTime value)
+    {
+        if (value != new DateTime(1, 1, 1))
+        {
+            encode_opening_tag(buffer, tagNumber);
+            bacapp_encode_datetime(buffer, value);
+            encode_closing_tag(buffer, tagNumber);
+        }
+    }
+
+    public static void bacapp_encode_timestamp(EncodeBuffer buffer, BacnetGenericTime value)
+    {
+        switch (value.Tag)
+        {
+            case BacnetTimestampTags.TIME_STAMP_TIME:
+                encode_context_time(buffer, 0, value.Time);
+                break;
+
+            case BacnetTimestampTags.TIME_STAMP_SEQUENCE:
+                encode_context_unsigned(buffer, 1, value.Sequence);
+                break;
+
+            case BacnetTimestampTags.TIME_STAMP_DATETIME:
+                bacapp_encode_context_datetime(buffer, 2, value.Time);
+                break;
+
+            case BacnetTimestampTags.TIME_STAMP_NONE:
+                break;
+
+            default:
+                throw new NotImplementedException();
+        }
+    }
+
+    public static void bacapp_encode_context_timestamp(EncodeBuffer buffer, byte tagNumber, BacnetGenericTime value)
+    {
+        if (value.Tag != BacnetTimestampTags.TIME_STAMP_NONE)
+        {
+            encode_opening_tag(buffer, tagNumber);
+            bacapp_encode_timestamp(buffer, value);
+            encode_closing_tag(buffer, tagNumber);
+        }
+    }
+
+    public static void encode_application_character_string(EncodeBuffer buffer, string value)
+    {
+        var tmp = new EncodeBuffer();
+        encode_bacnet_character_string(tmp, value);
+
+        encode_tag(buffer, (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_CHARACTER_STRING, false,
+            (uint)tmp.offset);
+        buffer.Add(tmp.buffer, tmp.offset);
+    }
+
+    public static void encode_bacnet_character_string(EncodeBuffer buffer, string value)
+    {
+        buffer.Add((byte)BacnetCharacterStringEncodings.CHARACTER_UTF8);
+        var bufUtf8 = Encoding.UTF8.GetBytes(value); // Encoding.ASCII depreciated : Addendum 135-2008k
+        buffer.Add(bufUtf8, bufUtf8.Length);
+    }
+
+    public static void encode_unsigned16(EncodeBuffer buffer, ushort value)
+    {
+        buffer.Add((byte)((value & 0xff00) >> 8));
+        buffer.Add((byte)((value & 0x00ff) >> 0));
+    }
+
+    public static void encode_unsigned24(EncodeBuffer buffer, uint value)
+    {
+        buffer.Add((byte)((value & 0xff0000) >> 16));
+        buffer.Add((byte)((value & 0x00ff00) >> 8));
+        buffer.Add((byte)((value & 0x0000ff) >> 0));
+    }
+
+    public static void encode_unsigned32(EncodeBuffer buffer, uint value)
+    {
+        buffer.Add((byte)((value & 0xff000000) >> 24));
+        buffer.Add((byte)((value & 0x00ff0000) >> 16));
+        buffer.Add((byte)((value & 0x0000ff00) >> 8));
+        buffer.Add((byte)((value & 0x000000ff) >> 0));
+    }
+
+    public static void encode_signed16(EncodeBuffer buffer, short value)
+    {
+        buffer.Add((byte)((value & 0xff00) >> 8));
+        buffer.Add((byte)((value & 0x00ff) >> 0));
+    }
+
+    public static void encode_signed24(EncodeBuffer buffer, int value)
+    {
+        buffer.Add((byte)((value & 0xff0000) >> 16));
+        buffer.Add((byte)((value & 0x00ff00) >> 8));
+        buffer.Add((byte)((value & 0x0000ff) >> 0));
+    }
+
+    public static void encode_signed32(EncodeBuffer buffer, int value)
+    {
+        buffer.Add((byte)((value & 0xff000000) >> 24));
+        buffer.Add((byte)((value & 0x00ff0000) >> 16));
+        buffer.Add((byte)((value & 0x0000ff00) >> 8));
+        buffer.Add((byte)((value & 0x000000ff) >> 0));
+    }
+
+    public static void encode_signed64(EncodeBuffer buffer, long value)
+    {
+        buffer.Add((byte)(value >> 56));
+        buffer.Add((byte)((value & 0xff000000000000) >> 48));
+        buffer.Add((byte)((value & 0xff0000000000) >> 40));
+        buffer.Add((byte)((value & 0xff00000000) >> 32));
+
+        buffer.Add((byte)((value & 0xff000000) >> 24));
+        buffer.Add((byte)((value & 0x00ff0000) >> 16));
+        buffer.Add((byte)((value & 0x0000ff00) >> 8));
+        buffer.Add((byte)((value & 0x000000ff) >> 0));
+    }
+
+    public static void encode_read_access_specification(EncodeBuffer buffer, BacnetReadAccessSpecification value)
+    {
+        /* Tag 0: BACnetObjectIdentifier */
+        encode_context_object_id(buffer, 0, value.objectIdentifier.type, value.objectIdentifier.instance);
+
+        /* Tag 1: sequence of BACnetPropertyReference */
+        encode_opening_tag(buffer, 1);
+        foreach (var p in value.propertyReferences)
+        {
+            encode_context_enumerated(buffer, 0, p.propertyIdentifier);
+
+            /* optional array index */
+            if (p.propertyArrayIndex != BACNET_ARRAY_ALL)
+                encode_context_unsigned(buffer, 1, p.propertyArrayIndex);
+        }
+        encode_closing_tag(buffer, 1);
+    }
+
+    public static void encode_read_access_result(EncodeBuffer buffer, BacnetReadAccessResult value)
+    {
+        /* Tag 0: BACnetObjectIdentifier */
+        encode_context_object_id(buffer, 0, value.objectIdentifier.type, value.objectIdentifier.instance);
+
+        /* Tag 1: listOfResults */
+        encode_opening_tag(buffer, 1);
+        foreach (var pValue in value.values)
+        {
+            /* Tag 2: propertyIdentifier */
+            encode_context_enumerated(buffer, 2, pValue.property.propertyIdentifier);
+            /* Tag 3: optional propertyArrayIndex */
+            if (pValue.property.propertyArrayIndex != BACNET_ARRAY_ALL)
+                encode_context_unsigned(buffer, 3, pValue.property.propertyArrayIndex);
+
+            if (pValue.value != null && pValue.value[0].Value is BacnetError)
+            {
+                /* Tag 5: Error */
+                encode_opening_tag(buffer, 5);
+                encode_application_enumerated(buffer, (uint)((BacnetError)pValue.value[0].Value).error_class);
+                encode_application_enumerated(buffer, (uint)((BacnetError)pValue.value[0].Value).error_code);
+                encode_closing_tag(buffer, 5);
+            }
+            else
+            {
+                /* Tag 4: Value */
+                encode_opening_tag(buffer, 4);
+                foreach (var v in pValue.value)
+                {
+                    bacapp_encode_application_data(buffer, v);
+                }
+                encode_closing_tag(buffer, 4);
+            }
+        }
+        encode_closing_tag(buffer, 1);
+    }
+
+    public static int decode_read_access_result(BacnetAddress address, byte[] buffer, int offset, int apdu_len, out BacnetReadAccessResult value)
+    {
+        var len = 0;
+
+        value = new BacnetReadAccessResult();
+
+        if (!decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+        len = 1;
+        len += decode_object_id(buffer, offset + len, out value.objectIdentifier.type,
+            out value.objectIdentifier.instance);
+
+        /* Tag 1: listOfResults */
+        if (!decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        var valueList = new List<BacnetPropertyValue>();
+        while (apdu_len - len > 0)
+        {
+            var new_entry = new BacnetPropertyValue();
+
+            /* end */
+            if (decode_is_closing_tag_number(buffer, offset + len, 1))
+            {
+                len++;
+                break;
+            }
+
+            /* Tag 2: propertyIdentifier */
+            len += decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+            if (tagNumber != 2)
+                return -1;
+            len += decode_enumerated(buffer, offset + len, lenValueType, out new_entry.property.propertyIdentifier);
+            /* Tag 3: Optional Array Index */
+            var tagLen = decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            if (tagNumber == 3)
+            {
+                len += tagLen;
+                len += decode_unsigned(buffer, offset + len, lenValueType,
+                    out new_entry.property.propertyArrayIndex);
+            }
+            else
+                new_entry.property.propertyArrayIndex = BACNET_ARRAY_ALL;
+
+            /* Tag 4: Value */
+            tagLen = decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber == 4)
+            {
+                var localValueList = new List<BacnetValue>();
+                while (!decode_is_closing_tag_number(buffer, offset + len, 4))
+                {
+                    tagLen = bacapp_decode_application_data(address, buffer, offset + len, apdu_len + offset - 1,
+                        value.objectIdentifier.type, (BacnetPropertyIds)new_entry.property.propertyIdentifier, out var v);
+                    if (tagLen < 0) return -1;
+                    len += tagLen;
+                    localValueList.Add(v);
+                }
+                // FC : two values one Date & one Time => change to one datetime
+                if (localValueList.Count == 2 && localValueList[0].Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE && localValueList[1].Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME)
+                {
+                    var date = (DateTime)localValueList[0].Value;
+                    var time = (DateTime)localValueList[1].Value;
+                    var bdatetime = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
+                    localValueList.Clear();
+                    localValueList.Add(new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_DATETIME, bdatetime));
+                    new_entry.value = localValueList;
+                }
+                else
+                    new_entry.value = localValueList;
+                len++;
+            }
+            else if (tagNumber == 5)
+            {
+                /* Tag 5: Error */
+                var err = new BacnetError();
+                len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                len += decode_enumerated(buffer, offset + len, lenValueType, out err.error_class);
+                len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                len += decode_enumerated(buffer, offset + len, lenValueType, out err.error_code);
+                if (!decode_is_closing_tag_number(buffer, offset + len, 5))
+                    return -1;
+                len++;
+
+                new_entry.value = new[] { new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR, err) };
+            }
+
+            valueList.Add(new_entry);
+        }
+        value.values = valueList;
+
+        return len;
+    }
+
+    public static int decode_read_access_specification(byte[] buffer, int offset, int apdu_len, out BacnetReadAccessSpecification value)
+    {
+        var len = 0;
+
+        value = new BacnetReadAccessSpecification();
+
+        /* Tag 0: Object ID */
+        if (!decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+        len++;
+        len += decode_object_id(buffer, offset + len, out value.objectIdentifier.type,
+            out value.objectIdentifier.instance);
+
+        /* Tag 1: sequence of ReadAccessSpecification */
+        if (!decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++; /* opening tag is only one octet */
+
+        /* properties */
+        var propertyIdAndArrayIndex = new List<BacnetPropertyReference>();
+        while (apdu_len - len > 1 && !decode_is_closing_tag_number(buffer, offset + len, 1))
+        {
+            var p_ref = new BacnetPropertyReference();
+
+            /* Tag 0: propertyIdentifier */
+            if (!IS_CONTEXT_SPECIFIC(buffer[offset + len]))
+                return -1;
+
+            len += decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue_type);
+            if (tagNumber != 0)
+                return -1;
+
+            /* Should be at least the unsigned value + 1 tag left */
+            if (len + lenValue_type >= apdu_len)
+                return -1;
+            len += decode_enumerated(buffer, offset + len, lenValue_type, out p_ref.propertyIdentifier);
+            /* Assume most probable outcome */
+            p_ref.propertyArrayIndex = BACNET_ARRAY_ALL;
+            /* Tag 1: Optional propertyArrayIndex */
+            if (IS_CONTEXT_SPECIFIC(buffer[offset + len]) && !IS_CLOSING_TAG(buffer[offset + len]))
+            {
+                var tmp = decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue_type);
+                if (tagNumber == 1)
+                {
+                    len += tmp;
+                    /* Should be at least the unsigned array index + 1 tag left */
+                    if (len + lenValue_type >= apdu_len)
+                        return -1;
+                    len += decode_unsigned(buffer, offset + len, lenValue_type, out p_ref.propertyArrayIndex);
+                }
+            }
+            propertyIdAndArrayIndex.Add(p_ref);
+        }
+
+        /* closing tag */
+        if (!decode_is_closing_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        value.propertyReferences = propertyIdAndArrayIndex;
+        return len;
+    }
+
+    public static int decode_device_obj_property_ref(byte[] buffer, int offset, int apdu_len, out BacnetDeviceObjectPropertyReference value)
+    {
+        var len = 0;
+
+        value = new BacnetDeviceObjectPropertyReference { arrayIndex = BACNET_ARRAY_ALL };
+
+        /* Tag 0: Object ID */
+        if (!decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+
+        len++;
+        len += decode_object_id(buffer, offset + len, out value.objectIdentifier.type,
+            out value.objectIdentifier.instance);
+
+        /* Tag 1 : Property identifier */
+        len += decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return -1;
+
+        len += decode_enumerated(buffer, offset + len, lenValueType, out value.propertyIdentifier);
+
+        /* Tag 2: Optional Array Index */
+        var tagLen = decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber == 2)
+        {
+            len += tagLen;
+            len += decode_unsigned(buffer, offset + len, lenValueType, out value.arrayIndex);
+        }
+
+        /* Tag 3 : Optional Device Identifier */
+        if (!decode_is_context_tag(buffer, offset + len, 3))
+            return len;
+        if (IS_CLOSING_TAG(buffer[offset + len])) return len;
+
+        len++;
+
+        len += decode_object_id(buffer, offset + len, out value.deviceIndentifier.type,
+            out value.deviceIndentifier.instance);
+
+        return len;
+    }
+
+    public static int decode_unsigned(byte[] buffer, int offset, uint lenValue, out uint value)
+    {
+        switch (lenValue)
+        {
+            case 1:
+                value = buffer[offset];
+                break;
+
+            case 2:
+                decode_unsigned16(buffer, offset, out var unsigned16Value);
+                value = unsigned16Value;
+                break;
+
+            case 3:
+                decode_unsigned24(buffer, offset, out value);
+                break;
+
+            case 4:
+                decode_unsigned32(buffer, offset, out value);
+                break;
+
+            default:
+                value = 0;
+                break;
+        }
+
+        return (int)lenValue;
+    }
+
+    public static int decode_unsigned32(byte[] buffer, int offset, out uint value)
+    {
+        value = ((uint)buffer[offset + 0] << 24) & 0xff000000;
+        value |= ((uint)buffer[offset + 1] << 16) & 0x00ff0000;
+        value |= ((uint)buffer[offset + 2] << 8) & 0x0000ff00;
+        value |= (uint)buffer[offset + 3] & 0x000000ff;
+        return 4;
+    }
+
+    public static int decode_unsigned24(byte[] buffer, int offset, out uint value)
+    {
+        value = ((uint)buffer[offset + 0] << 16) & 0x00ff0000;
+        value |= ((uint)buffer[offset + 1] << 8) & 0x0000ff00;
+        value |= (uint)buffer[offset + 2] & 0x000000ff;
+        return 3;
+    }
+
+    public static int decode_unsigned16(byte[] buffer, int offset, out ushort value)
+    {
+        value = (ushort)(((uint)buffer[offset + 0] << 8) & 0x0000ff00);
+        value |= (ushort)((uint)buffer[offset + 1] & 0x000000ff);
+        return 2;
+    }
+
+    public static int decode_unsigned8(byte[] buffer, int offset, out byte value)
+    {
+        value = buffer[offset + 0];
+        return 1;
+    }
+
+    public static int decode_signed32(byte[] buffer, int offset, out int value)
+    {
+        value = (int)((buffer[offset + 0] << 24) & 0xff000000);
+        value |= (buffer[offset + 1] << 16) & 0x00ff0000;
+        value |= (buffer[offset + 2] << 8) & 0x0000ff00;
+        value |= buffer[offset + 3] & 0x000000ff;
+        return 4;
+    }
+
+    public static int decode_signed24(byte[] buffer, int offset, out int value)
+    {
+        value = (buffer[offset + 0] << 16) & 0x00ff0000;
+        value |= (buffer[offset + 1] << 8) & 0x0000ff00;
+        value |= buffer[offset + 2] & 0x000000ff;
+        if ((value & 0x800000) != 0) value |= 0xff << 24; // set sign
+        return 3;
+    }
+
+    public static int decode_signed16(byte[] buffer, int offset, out short value)
+    {
+        value = (short)((buffer[offset + 0] << 8) & 0x0000ff00);
+        value |= (short)(buffer[offset + 1] & 0x000000ff);
+        return 2;
+    }
+
+    public static int decode_signed8(byte[] buffer, int offset, out sbyte value)
+    {
+        value = (sbyte)buffer[offset + 0];
+        return 1;
+    }
+
+    public static bool IS_EXTENDED_TAG_NUMBER(byte x)
+    {
+        return (x & 0xF0) == 0xF0;
+    }
+
+    public static bool IS_EXTENDED_VALUE(byte x)
+    {
+        return (x & 0x07) == 5;
+    }
+
+    public static bool IS_CONTEXT_SPECIFIC(byte x)
+    {
+        return (x & 0x8) == 0x8;
+    }
+
+    public static bool IS_OPENING_TAG(byte x)
+    {
+        return (x & 0x07) == 6;
+    }
+
+    public static bool IS_CLOSING_TAG(byte x)
+    {
+        return (x & 0x07) == 7;
+    }
+
+    public static int decode_tag_number(byte[] buffer, int offset, out byte tagNumber)
+    {
+        var len = 1; /* return value */
+
+        /* decode the tag number first */
+        if (IS_EXTENDED_TAG_NUMBER(buffer[offset]))
+        {
+            /* extended tag */
+            tagNumber = buffer[offset + 1];
+            len++;
+        }
+        else
+        {
+            tagNumber = (byte)(buffer[offset] >> 4);
+        }
+
+        return len;
+    }
+
+    public static int decode_signed(byte[] buffer, int offset, uint lenValue, out int value)
+    {
+        switch (lenValue)
+        {
+            case 1:
+                decode_signed8(buffer, offset, out var sbyteValue);
+                value = sbyteValue;
+                break;
+
+            case 2:
+                decode_signed16(buffer, offset, out var shortValue);
+                value = shortValue;
+                break;
+
+            case 3:
+                decode_signed24(buffer, offset, out value);
+                break;
+
+            case 4:
+                decode_signed32(buffer, offset, out value);
+                break;
+
+            default:
+                value = 0;
+                break;
+        }
+
+        return (int)lenValue;
+    }
+
+    public static int decode_real(byte[] buffer, int offset, out float value)
+    {
+        byte[] tmp = { buffer[offset + 3], buffer[offset + 2], buffer[offset + 1], buffer[offset + 0] };
+        value = BitConverter.ToSingle(tmp, 0);
+        return 4;
+    }
+
+    public static int decode_real_safe(byte[] buffer, int offset, uint lenValue, out float value)
+    {
+        if (lenValue == 4)
+            return decode_real(buffer, offset, out value);
+
+        value = 0.0f;
+        return (int)lenValue;
+    }
+
+    public static int decode_double(byte[] buffer, int offset, out double value)
+    {
+        byte[] tmp =
+        {
+                buffer[offset + 7], buffer[offset + 6], buffer[offset + 5], buffer[offset + 4],
+                buffer[offset + 3], buffer[offset + 2], buffer[offset + 1], buffer[offset + 0]
+            };
+        value = BitConverter.ToDouble(tmp, 0);
+        return 8;
+    }
+
+    public static int decode_double_safe(byte[] buffer, int offset, uint lenValue, out double value)
+    {
+        if (lenValue == 8)
+            return decode_double(buffer, offset, out value);
+
+        value = 0.0f;
+        return (int)lenValue;
+    }
+
+    private static bool octetstring_copy(byte[] buffer, int offset, int maxOffset, byte[] octetString, int octetStringOffset, uint octetStringLength)
+    {
+        var status = false; /* return value */
+
+        if (octetStringLength <= maxOffset + offset)
+        {
+            if (octetString != null)
+                Array.Copy(buffer, offset, octetString, octetStringOffset,
+                    Math.Min(octetString.Length, buffer.Length - offset));
+            status = true;
+        }
+
+        return status;
+    }
+
+    public static int decode_octet_string(byte[] buffer, int offset, int maxLength, byte[] octetString, int octetStringOffset, uint octetStringLength)
+    {
+        octetstring_copy(buffer, offset, maxLength, octetString, octetStringOffset, octetStringLength);
+        var len = (int)octetStringLength;
+
+        return len;
+    }
+
+    public static int decode_context_octet_string(byte[] buffer, int offset, int maxLength, byte tagNumber, byte[] octetString, int octetStringOffset)
+    {
+        var len = 0; /* return value */
+
+        if (decode_is_context_tag(buffer, offset, tagNumber))
+        {
+            len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out var lenValue);
+
+            if (octetstring_copy(buffer, offset + len, maxLength, octetString, octetStringOffset, lenValue))
+            {
+                len += (int)lenValue;
+            }
+        }
+        else
+            len = -1;
+
+        return len;
+    }
+
+    private static bool multi_charset_characterstring_decode(byte[] buffer, int offset, byte encoding, uint length, out string charString)
+    {
+        try
+        {
+            Encoding e;
+
+            switch ((BacnetCharacterStringEncodings)encoding)
+            {
+                // 'normal' encoding, backward compatible ANSI_X34 (for decoding only)
+                case BacnetCharacterStringEncodings.CHARACTER_UTF8:
+                    e = Encoding.UTF8;
+                    break;
+
+                // UCS2 is backward compatible UTF16 (for decoding only)
+                // http://hackipedia.org/Character%20sets/Unicode,%20UTF%20and%20UCS%20encodings/UCS-2.htm
+                // https://en.wikipedia.org/wiki/Byte_order_mark
+                case BacnetCharacterStringEncodings.CHARACTER_UCS2:
+                    if (buffer[offset] == 0xFF && buffer[offset + 1] == 0xFE) // Byte Order Mark
+                        e = Encoding.Unicode; // little endian encoding
+                    else
+                        e = Encoding.BigEndianUnicode; // big endian encoding if BOM is not set, or 0xFE-0xFF
+                    break;
+
+                // eq. UTF32. In usage somewhere for transmission ? A bad idea !
+                case BacnetCharacterStringEncodings.CHARACTER_UCS4:
+                    if (buffer[offset] == 0xFF && buffer[offset + 1] == 0xFE && buffer[offset + 2] == 0 &&
+                        buffer[offset + 3] == 0)
+                        e = Encoding.UTF32; // UTF32 little endian encoding
+                    else
+                        e = Encoding.GetEncoding(12001);
+                    // UTF32 big endian encoding if BOM is not set, or 0-0-0xFE-0xFF
+                    break;
+
+                case BacnetCharacterStringEncodings.CHARACTER_ISO8859:
+                    e = Encoding.GetEncoding(28591); // "iso-8859-1"
+                    break;
+
+                // FIXME: somebody in Japan (or elsewhere) could help,test&validate if such devices exist ?
+                // http://cgproducts.johnsoncontrols.com/met_pdf/1201531.pdf?ref=binfind.com/web page 18
+                case BacnetCharacterStringEncodings.CHARACTER_MS_DBCS:
+                    e = Encoding.GetEncoding("shift_jis");
+                    break;
+
+                // FIXME: somebody in Japan (or elsewhere) could help,test&validate if such devices exist ?
+                // http://www.sljfaq.org/afaq/encodings.html
+                case BacnetCharacterStringEncodings.CHARACTER_JISX_0208:
+                    e = Encoding.GetEncoding("shift_jis"); // maybe "iso-2022-jp" ?
+                    break;
+
+                // unknown code (wrong code, experimental, ...)
+                // decoded as ISO-8859-1 (removing controls) : displays certainly a strange content !
+                default:
+                    var sb = new StringBuilder();
+                    for (var i = 0; i < length; i++)
+                    {
+                        var oneChar = (char)buffer[offset + i]; // byte to char on .NET : ISO-8859-1
+                        if (char.IsSymbol(oneChar)) sb.Append(oneChar);
+                    }
+                    charString = sb.ToString();
+                    return true;
+            }
+
+            charString = e.GetString(buffer, offset, (int)length);
+        }
+        catch
+        {
+            charString = "string decoding error !";
+        }
+
+        return true; // always OK
+    }
+
+    public static int decode_character_string(byte[] buffer, int offset, int maxLength, uint lenValue, out string charString)
+    {
+        var len = 0; /* return value */
+
+        var status = multi_charset_characterstring_decode(buffer, offset + 1, buffer[offset], lenValue - 1, out charString);
+        if (status)
+        {
+            len = (int)lenValue;
+        }
+
+        return len;
+    }
+
+    private static void bitstring_set_octet(ref BacnetBitString bitString, byte index, byte octet)
+    {
+        if (index < MAX_BITSTRING_BYTES)
+            bitString.value[index] = octet;
+    }
+
+    private static void bitstring_set_bits_used(ref BacnetBitString bitString, byte bytesUsed, byte unusedBits)
+    {
+        /* FIXME: check that bytesUsed is at least one? */
+        bitString.bits_used = (byte)(bytesUsed * 8);
+        bitString.bits_used -= unusedBits;
+    }
+
+    public static int decode_bitstring(byte[] buffer, int offset, uint lenValue, out BacnetBitString bitString)
+    {
+        var len = 0;
+
+        bitString = new BacnetBitString { value = new byte[MAX_BITSTRING_BYTES] };
+        if (lenValue > 0)
+        {
+            /* the first octet contains the unused bits */
+            var bytesUsed = lenValue - 1;
+            if (bytesUsed <= MAX_BITSTRING_BYTES)
+            {
+                len = 1;
+                for (uint i = 0; i < bytesUsed; i++)
+                {
+                    bitstring_set_octet(ref bitString, (byte)i, byte_reverse_bits(buffer[offset + len++]));
+                }
+                var unusedBits = (byte)(buffer[offset] & 0x07);
+                bitstring_set_bits_used(ref bitString, (byte)bytesUsed, unusedBits);
+            }
+        }
+
+        return len;
+    }
+
+    public static int decode_context_character_string(byte[] buffer, int offset, int maxLength, byte tagNumber, out string charString)
+    {
+        var len = 0; /* return value */
+
+        charString = null;
+        if (decode_is_context_tag(buffer, offset + len, tagNumber))
+        {
+            len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out var lenValue);
+
+            var status = multi_charset_characterstring_decode(buffer, offset + 1 + len, buffer[offset + len], lenValue - 1, out charString);
+
+            if (status)
+                len += (int)lenValue;
+        }
+        else
+            len = -1;
+
+        return len;
+    }
+
+    public static int decode_date(byte[] buffer, int offset, out DateTime bdate)
+    {
+        int year = (ushort)(buffer[offset] + 1900);
+        int month = buffer[offset + 1];
+        int day = buffer[offset + 2];
+        int wday = buffer[offset + 3];
+
+        if (month == 0xFF && day == 0xFF && wday == 0xFF && year - 1900 == 0xFF)
+            bdate = new DateTime(1, 1, 1);
+        else
+            bdate = new DateTime(year, month, day);
+
+        return 4;
+    }
+
+    public static int decode_date_safe(byte[] buffer, int offset, uint lenValue, out DateTime bdate)
+    {
+        if (lenValue == 4)
+            return decode_date(buffer, offset, out bdate);
+
+        bdate = new DateTime(1, 1, 1);
+        return (int)lenValue;
+    }
+
+    public static int decode_bacnet_time(byte[] buffer, int offset, out DateTime btime)
+    {
+        int hour = buffer[offset + 0];
+        int min = buffer[offset + 1];
+        int sec = buffer[offset + 2];
+        int hundredths = buffer[offset + 3];
+        if (hour == 0xFF && min == 0xFF && sec == 0xFF && hundredths == 0xFF)
+        {
+            btime = new DateTime(1, 1, 1);
+        }
+        else
+        {
+            if (hundredths > 100) hundredths = 0; // sometimes set to 255
+            btime = new DateTime(1, 1, 1, hour, min, sec, hundredths * 10);
+        }
+        return 4;
+    }
+
+    public static int decode_bacnet_time_safe(byte[] buffer, int offset, uint lenValue, out DateTime btime)
+    {
+        if (lenValue == 4)
+            return decode_bacnet_time(buffer, offset, out btime);
+
+        btime = new DateTime(1, 1, 1);
+        return (int)lenValue;
+    }
+
+    public static int decode_bacnet_datetime(byte[] buffer, int offset, out DateTime bdatetime)
+    {
+        var len = 0;
+        len += decode_application_date(buffer, offset + len, out var date); // Date
+        len += decode_application_time(buffer, offset + len, out var time); // Time
+        bdatetime = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
+        return len;
+    }
+
+    public static int decode_object_id(byte[] buffer, int offset, out ushort objectType, out uint instance)
+    {
+        var len = decode_unsigned32(buffer, offset, out var value);
+        objectType = (ushort)((value >> BACNET_INSTANCE_BITS) & BACNET_MAX_OBJECT);
+        instance = value & BACNET_MAX_INSTANCE;
+
+        return len;
+    }
+
+    public static int decode_object_id_safe(byte[] buffer, int offset, uint lenValue, out ushort objectType, out uint instance)
+    {
+        if (lenValue == 4)
+            return decode_object_id(buffer, offset, out objectType, out instance);
+
+        objectType = 0;
+        instance = 0;
+        return 0;
+    }
+
+    public static int decode_context_object_id(byte[] buffer, int offset, byte tagNumber, out ushort objectType, out uint instance)
+    {
+        var len = 0;
+
+        if (decode_is_context_tag_with_length(buffer, offset + len, tagNumber, out len))
+        {
+            len += decode_object_id(buffer, offset + len, out objectType, out instance);
+        }
+        else
+        {
+            objectType = 0;
+            instance = 0;
+            len = -1;
+        }
+        return len;
+    }
+
+    public static int decode_application_time(byte[] buffer, int offset, out DateTime btime)
+    {
+        var len = 0;
+        decode_tag_number(buffer, offset + len, out var tagNumber);
+
+        if (tagNumber == (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME)
+        {
+            len++;
+            len += decode_bacnet_time(buffer, offset + len, out btime);
+        }
+        else
+        {
+            btime = new DateTime(1, 1, 1);
+            len = -1;
+        }
+        return len;
+    }
+
+    public static int decode_context_bacnet_time(byte[] buffer, int offset, byte tagNumber, out DateTime btime)
+    {
+        var len = 0;
+
+        if (decode_is_context_tag_with_length(buffer, offset + len, tagNumber, out len))
+        {
+            len += decode_bacnet_time(buffer, offset + len, out btime);
+        }
+        else
+        {
+            btime = new DateTime(1, 1, 1);
+            len = -1;
+        }
+        return len;
+    }
+
+    public static int decode_application_date(byte[] buffer, int offset, out DateTime bdate)
+    {
+        var len = 0;
+        decode_tag_number(buffer, offset + len, out var tagNumber);
+
+        if (tagNumber == (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE)
+        {
+            len++;
+            len += decode_date(buffer, offset + len, out bdate);
+        }
+        else
+        {
+            bdate = new DateTime(1, 1, 1);
+            len = -1;
+        }
+        return len;
+    }
+
+    public static bool decode_is_context_tag_with_length(byte[] buffer, int offset, byte tagNumber, out int tagLength)
+    {
+        tagLength = decode_tag_number(buffer, offset, out var myTagNumber);
+        return IS_CONTEXT_SPECIFIC(buffer[offset]) && myTagNumber == tagNumber;
+    }
+
+    public static int decode_context_date(byte[] buffer, int offset, byte tagNumber, out DateTime bdate)
+    {
+        var len = 0;
+
+        if (decode_is_context_tag_with_length(buffer, offset + len, tagNumber, out len))
+        {
+            len += decode_date(buffer, offset + len, out bdate);
+        }
+        else
+        {
+            bdate = new DateTime(1, 1, 1);
+            len = -1;
+        }
+        return len;
+    }
+
+    public static int bacapp_decode_data(byte[] buffer, int offset, int maxLength, BacnetApplicationTags tagDataType, uint lenValueType, out BacnetValue value)
+    {
+        var len = 0;
+        uint uintValue;
+
+        value = new BacnetValue { Tag = tagDataType };
+
+        switch (tagDataType)
+        {
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL:
+                /* nothing else to do */
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN:
+                value.Value = lenValueType > 0;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT:
+                len = decode_unsigned(buffer, offset, lenValueType, out uintValue);
+                value.Value = uintValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT:
+                len = decode_signed(buffer, offset, lenValueType, out var intValue);
+                value.Value = intValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL:
+                len = decode_real_safe(buffer, offset, lenValueType, out var floatValue);
+                value.Value = floatValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE:
+                len = decode_double_safe(buffer, offset, lenValueType, out var doubleValue);
+                value.Value = doubleValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING:
+                var octetString = new byte[lenValueType];
+                len = decode_octet_string(buffer, offset, maxLength, octetString, 0, lenValueType);
+                value.Value = octetString;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_CHARACTER_STRING:
+                len = decode_character_string(buffer, offset, maxLength, lenValueType, out var stringValue);
+                value.Value = stringValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING:
+                len = decode_bitstring(buffer, offset, lenValueType, out var bitValue);
+                value.Value = bitValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED:
+                len = decode_enumerated(buffer, offset, lenValueType, out value.Value);
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE:
+                len = decode_date_safe(buffer, offset, lenValueType, out var dateValue);
+                value.Value = dateValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME:
+                len = decode_bacnet_time_safe(buffer, offset, lenValueType, out var timeValue);
+                value.Value = timeValue;
+                break;
+
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID:
+                len = decode_object_id_safe(buffer, offset, lenValueType, out var objectType, out var instance);
+                value.Value = new BacnetObjectId((BacnetObjectTypes)objectType, instance);
+                break;
+        }
+
+        return len;
+    }
+
+    /* returns the fixed tag type for certain context tagged properties */
+
+    private static BacnetApplicationTags bacapp_context_tag_type(BacnetAddress address, BacnetPropertyIds property, byte tagNumber)
+    {
+        var tag = BacnetApplicationTags.MAX_BACNET_APPLICATION_TAG;
+
+        switch (property)
+        {
+            case BacnetPropertyIds.PROP_ACTUAL_SHED_LEVEL:
+            case BacnetPropertyIds.PROP_REQUESTED_SHED_LEVEL:
+            case BacnetPropertyIds.PROP_EXPECTED_SHED_LEVEL:
+                switch (tagNumber)
+                {
+                    case 0:
+                    case 1:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                        break;
+
+                    case 2:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL;
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_ACTION:
+                switch (tagNumber)
+                {
+                    case 0:
+                    case 1:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+
+                    case 2:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED;
+                        break;
+
+                    case 3:
+                    case 5:
+                    case 6:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                        break;
+
+                    case 7:
+                    case 8:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN;
+                        break;
+
+                    case 4: /* propertyValue: abstract syntax */
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_LIST_OF_GROUP_MEMBERS:
+                /* Sequence of ReadAccessSpecification */
+                switch (tagNumber)
+                {
+                    case 0:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_EXCEPTION_SCHEDULE:
+                switch (tagNumber)
+                {
+                    case 1:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+
+                    case 3:
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                        break;
+
+                    case 0: /* calendarEntry: abstract syntax + context */
+                    case 2: /* list of BACnetTimeValue: abstract syntax */
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_LOG_DEVICE_OBJECT_PROPERTY:
+                switch (tagNumber)
+                {
+                    case 0: /* Object ID */
+                    case 3: /* Device ID */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+
+                    case 1: /* Property ID */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED;
+                        break;
+
+                    case 2: /* Array index */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_SUBORDINATE_LIST:
+            case BacnetPropertyIds.PROP_ZONE_MEMBERS:
+                /* BACnetARRAY[N] of BACnetDeviceObjectReference */
+                switch (tagNumber)
+                {
+                    case 0: /* Optional Device ID */
+                    case 1: /* Object ID */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_RECIPIENT_LIST:
+                /* List of BACnetDestination */
+                switch (tagNumber)
+                {
+                    case 0: /* Device Object ID */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID;
+                        break;
+                }
+                break;
+
+            case BacnetPropertyIds.PROP_ACTIVE_COV_SUBSCRIPTIONS:
+                /* BACnetCOVSubscription */
+                switch (tagNumber)
+                {
+                    case 0: /* BACnetRecipientProcess */
+                    case 1: /* BACnetObjectPropertyReference */
+                        break;
+
+                    case 2: /* issueConfirmedNotifications */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN;
+                        break;
+
+                    case 3: /* timeRemaining */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                        break;
+
+                    case 4: /* covIncrement */
+                        tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL;
+                        break;
+                }
+                break;
+            default:
+                tag = CustomTagResolver?.Invoke(address, property, tagNumber) ?? tag;
+                break;
+        }
+
+        return tag;
+    }
+
+    public static int bacapp_decode_context_data(byte[] buffer, int offset, uint maxAPDULen, BacnetApplicationTags propertyTag, out BacnetValue value)
+    {
+        int apduLen = 0, len = 0;
+
+        value = new BacnetValue();
+
+        if (IS_CONTEXT_SPECIFIC(buffer[offset]))
+        {
+            //value->context_specific = true;
+            var tagLen = decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+            apduLen = tagLen;
+            /* Empty construct : (closing tag) => returns NULL value */
+            if (tagLen > 0 && tagLen <= maxAPDULen &&
+                !decode_is_closing_tag_number(buffer, offset + len, tagNumber))
+            {
+                //value->context_tag = tagNumber;
+                if (propertyTag < BacnetApplicationTags.MAX_BACNET_APPLICATION_TAG)
+                {
+                    len = bacapp_decode_data(buffer, offset + apduLen, (int)maxAPDULen, propertyTag,
+                        lenValueType, out value);
+                    apduLen += len;
+                }
+                else if (lenValueType > 0)
+                {
+                    /* Unknown value : non null size (elementary type) */
+                    apduLen += (int)lenValueType;
+                    /* SHOULD NOT HAPPEN, EXCEPTED WHEN READING UNKNOWN CONTEXTUAL PROPERTY */
+                }
+                else
+                    apduLen = -1;
+            }
+            else if (tagLen == 1) /* and is a Closing tag */
+                apduLen = 0; /* Don't advance over that closing tag. */
+        }
+
+        return apduLen;
+    }
+
+    public static int bacapp_decode_application_data(BacnetAddress address, byte[] buffer, int offset, int maxOffset, BacnetObjectTypes objectType, BacnetPropertyIds propertyId, out BacnetValue value)
+    {
+        var len = 0;
+
+        value = new BacnetValue();
+
+        /* FIXME: use max_apdu_len! */
+        if (!IS_CONTEXT_SPECIFIC(buffer[offset]))
+        {
+            var tagLen = decode_tag_number_and_value(buffer, offset, out BacnetApplicationTags tagNumber, out uint lenValueType);
+            if (tagLen > 0)
+            {
+                len += tagLen;
+                var decodeLen = bacapp_decode_data(buffer, offset + len, maxOffset, tagNumber, lenValueType, out value);
+                if (decodeLen < 0) return decodeLen;
+                len += decodeLen;
+            }
+        }
+        else
+        {
+            return bacapp_decode_context_application_data(address, buffer, offset, maxOffset, objectType, propertyId,
+                out value);
+        }
+
+        return len;
+    }
+
+    public static int bacapp_decode_context_application_data(BacnetAddress address, byte[] buffer, int offset, int maxOffset, BacnetObjectTypes objectType, BacnetPropertyIds propertyId, out BacnetValue value)
+    {
+        var len = 0;
+
+        value = new BacnetValue();
+
+        if (IS_CONTEXT_SPECIFIC(buffer[offset]))
+        {
+            int tagLen;
+            uint lenValueType;
+            byte tagNumber;
+
+            //this seems to be a strange way to determine object encodings
+            if (propertyId == BacnetPropertyIds.PROP_LIST_OF_GROUP_MEMBERS)
+            {
+                tagLen = decode_read_access_specification(buffer, offset, maxOffset, out var v);
+                if (tagLen < 0) return -1;
+                value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_READ_ACCESS_SPECIFICATION;
+                value.Value = v;
+                return tagLen;
+            }
+            if (propertyId == BacnetPropertyIds.PROP_ACTIVE_COV_SUBSCRIPTIONS)
+            {
+                tagLen = decode_cov_subscription(buffer, offset, maxOffset, out var v);
+                if (tagLen < 0) return -1;
+                value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_COV_SUBSCRIPTION;
+                value.Value = v;
+                return tagLen;
+            }
+            if (objectType == BacnetObjectTypes.OBJECT_GROUP && propertyId == BacnetPropertyIds.PROP_PRESENT_VALUE)
+            {
+                tagLen = decode_read_access_result(address, buffer, offset, maxOffset, out BacnetReadAccessResult v);
+                if (tagLen < 0) return -1;
+                value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_READ_ACCESS_RESULT;
+                value.Value = v;
+                return tagLen;
+            }
+            if (propertyId == BacnetPropertyIds.PROP_LIST_OF_OBJECT_PROPERTY_REFERENCES ||
+                propertyId == BacnetPropertyIds.PROP_LOG_DEVICE_OBJECT_PROPERTY ||
+                propertyId == BacnetPropertyIds.PROP_OBJECT_PROPERTY_REFERENCE)
+            {
+                tagLen = decode_device_obj_property_ref(buffer, offset, maxOffset, out var v);
+                if (tagLen < 0) return -1;
+                value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_PROPERTY_REFERENCE;
+                value.Value = v;
+                return tagLen;
+            }
+            if (propertyId == BacnetPropertyIds.PROP_DATE_LIST)
+            {
+                var v = new BACnetCalendarEntry();
+                tagLen = v.Decode(buffer, offset, (uint)maxOffset);
+                if (tagLen < 0) return -1;
+                value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_DECODED;
+                value.Value = v;
+                return tagLen;
+            }
+            if (propertyId == BacnetPropertyIds.PROP_EVENT_TIME_STAMPS)
+            {
+                decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                len++; // skip Tag
+
+                if (tagNumber == 0) // Time without date
+                {
+                    len += decode_bacnet_time(buffer, offset + len, out var dt);
+                    value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_TIMESTAMP;
+                    value.Value = dt;
+                }
+                else if (tagNumber == 1) // sequence number
+                {
+                    len += decode_unsigned(buffer, offset + len, lenValueType, out var val);
+                    value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT;
+                    value.Value = val;
+                }
+                else if (tagNumber == 2) // date + time
+                {
+                    len += decode_bacnet_datetime(buffer, offset + len, out var dt);
+                    value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_TIMESTAMP;
+                    len++;  // closing Tag
+                    value.Value = dt;
+                }
+                else
+                    return -1;
+
+                return len;
+            }
+
+            value.Tag = BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_DECODED;
+            var list = new List<BacnetValue>();
+
+            decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            // If an opening tag is not present, no loop to get the values
+            var multiplValue = IS_OPENING_TAG(buffer[offset + len]);
+
+            while (len + offset <= maxOffset && !IS_CLOSING_TAG(buffer[offset + len]))
+            {
+                tagLen = decode_tag_number_and_value(buffer, offset + len, out var subTagNumber, out lenValueType);
+                if (tagLen < 0) return -1;
+
+                // DAL need to check explicitly for an opening tag, because,
+                // lenValueType could also be zero for example if we are parsing
+                // an empty octect string, or an integer value of zero
+                // The former happens when parsing the BACnetAddress within a RecipientList
+                // if the BACnetAddress has a broadcast MAC address
+                if (IS_OPENING_TAG(buffer[offset + len]))
+                {
+                    len += tagLen;
+                    tagLen = bacapp_decode_application_data(address, buffer, offset + len, maxOffset,
+                        BacnetObjectTypes.MAX_BACNET_OBJECT_TYPE, BacnetPropertyIds.MAX_BACNET_PROPERTY_ID,
+                        out var subValue);
+                    if (tagLen < 0) return -1;
+                    list.Add(subValue);
+                    len += tagLen;
+                }
+                else
+                {
+                    //override tagNumber
+                    var overrideTagNumber = bacapp_context_tag_type(address, propertyId, subTagNumber);
+                    if (overrideTagNumber != BacnetApplicationTags.MAX_BACNET_APPLICATION_TAG)
+                        subTagNumber = (byte)overrideTagNumber;
+
+                    //try app decode
+                    var subTagLen = bacapp_decode_data(buffer, offset + len + tagLen, maxOffset,
+                        (BacnetApplicationTags)subTagNumber, lenValueType, out var subValue);
+                    if (subTagLen == (int)lenValueType)
+                    {
+                        list.Add(subValue);
+                        len += tagLen + (int)lenValueType;
+                    }
+                    else
+                    {
+                        //fallback to copy byte array
+                        var contextSpecific = new byte[(int)lenValueType];
+                        Array.Copy(buffer, offset + len + tagLen, contextSpecific, 0, (int)lenValueType);
+                        subValue =
+                            new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_ENCODED,
+                                contextSpecific);
+
+                        list.Add(subValue);
+                        len += tagLen + (int)lenValueType;
+                    }
+                }
+
+                if (multiplValue == false)
+                {
+                    value = list[0];
+                    return len;
+                }
+            }
+            if (len + offset > maxOffset) return -1;
+
+            //end tag
+            if (decode_is_closing_tag_number(buffer, offset + len, tagNumber))
+                len++;
+
+            //context specifique is array of BACNET_VALUE
+            value.Value = list.ToArray();
+        }
+        else
+        {
+            return -1;
+        }
+
+        return len;
+    }
+
+    public static int decode_object_id(byte[] buffer, int offset, out BacnetObjectTypes objectType, out uint instance)
+    {
+        var len = decode_unsigned32(buffer, offset, out var value);
+        objectType = (BacnetObjectTypes)((value >> BACNET_INSTANCE_BITS) & BACNET_MAX_OBJECT);
+        instance = value & BACNET_MAX_INSTANCE;
+
+        return len;
+    }
+
+    public static int decode_enumerated(byte[] buffer, int offset, uint lenValue, out uint value)
+    {
+        var len = decode_unsigned(buffer, offset, lenValue, out value);
+        return len;
+    }
+
+    public static int decode_enumerated<TEnum>(byte[] buffer, int offset, uint lenValue, out TEnum value)
+    {
+        var len = decode_enumerated(buffer, offset, lenValue, out var rawValue);
+        value = (TEnum)(dynamic)rawValue;
+        return len;
+    }
+
+    public static bool decode_is_context_tag(byte[] buffer, int offset, byte tagNumber)
+    {
+        decode_tag_number(buffer, offset, out var myTagNumber);
+        return IS_CONTEXT_SPECIFIC(buffer[offset]) && myTagNumber == tagNumber;
+    }
+
+    public static bool decode_is_opening_tag_number(byte[] buffer, int offset, byte tagNumber)
+    {
+        decode_tag_number(buffer, offset, out var myTagNumber);
+        return IS_OPENING_TAG(buffer[offset]) && myTagNumber == tagNumber;
+    }
+
+    public static bool decode_is_closing_tag_number(byte[] buffer, int offset, byte tagNumber)
+    {
+        decode_tag_number(buffer, offset, out var myTagNumber);
+        return IS_CLOSING_TAG(buffer[offset]) && myTagNumber == tagNumber;
+    }
+
+    public static bool decode_is_closing_tag(byte[] buffer, int offset)
+    {
+        return (buffer[offset] & 0x07) == 7;
+    }
+
+    public static bool decode_is_opening_tag(byte[] buffer, int offset)
+    {
+        return (buffer[offset] & 0x07) == 6;
+    }
+
+    public static int decode_tag_number_and_value(byte[] buffer, int offset, out byte tagNumber, out uint value)
+    {
+        var len = decode_tag_number(buffer, offset, out tagNumber);
+        if (IS_EXTENDED_VALUE(buffer[offset]))
+        {
+            /* tagged as uint32_t */
+            if (buffer[offset + len] == 255)
+            {
+                len++;
+                len += decode_unsigned32(buffer, offset + len, out var value32);
+                value = value32;
+            }
+            /* tagged as uint16_t */
+            else if (buffer[offset + len] == 254)
+            {
+                len++;
+                len += decode_unsigned16(buffer, offset + len, out var value16);
+                value = value16;
+            }
+            /* no tag - must be uint8_t */
+            else
+            {
+                value = buffer[offset + len];
+                len++;
+            }
+        }
+        else if (IS_OPENING_TAG(buffer[offset]))
+        {
+            value = 0;
+        }
+        else if (IS_CLOSING_TAG(buffer[offset]))
+        {
+            /* closing tag */
+            value = 0;
+        }
+        else
+        {
+            /* small value */
+            value = (uint)(buffer[offset] & 0x07);
+        }
+
+        return len;
+    }
+
+    public static int decode_tag_number_and_value<TTag, TValue>(byte[] buffer, int offset, out TTag tag, out TValue value)
+    {
+        var len = decode_tag_number_and_value(buffer, offset, out var rawByte, out var rawValue);
+        tag = (TTag)(dynamic)rawByte;
+        value = (TValue)(dynamic)rawValue;
+        return len;
+    }
+
+    /// <summary>
+    ///     This is used by the Active_COV_Subscriptions property in DEVICE
+    /// </summary>
+    public static void encode_cov_subscription(EncodeBuffer buffer, BacnetCOVSubscription value)
+    {
+        /* Recipient [0] BACnetRecipientProcess - opening */
+        encode_opening_tag(buffer, 0);
+
+        /*  recipient [0] BACnetRecipient - opening */
+        encode_opening_tag(buffer, 0);
+        /* CHOICE - device [0] BACnetObjectIdentifier - opening */
+        /* CHOICE - address [1] BACnetAddress - opening */
+        encode_opening_tag(buffer, 1);
+        /* network-number Unsigned16, */
+        /* -- A value of 0 indicates the local network */
+        encode_application_unsigned(buffer, value.Recipient.net);
+        /* mac-address OCTET STRING */
+        /* -- A string of length 0 indicates a broadcast */
+        if (value.Recipient.net == 0xFFFF)
+            encode_application_octet_string(buffer, new byte[0], 0, 0);
+        else
+            encode_application_octet_string(buffer, value.Recipient.adr, 0, value.Recipient.adr.Length);
+        /* CHOICE - address [1] BACnetAddress - closing */
+        encode_closing_tag(buffer, 1);
+        /*  recipient [0] BACnetRecipient - closing */
+        encode_closing_tag(buffer, 0);
+
+        /* processIdentifier [1] Unsigned32 */
+        encode_context_unsigned(buffer, 1, value.subscriptionProcessIdentifier);
+        /* Recipient [0] BACnetRecipientProcess - closing */
+        encode_closing_tag(buffer, 0);
+
+        /*  MonitoredPropertyReference [1] BACnetObjectPropertyReference, */
+        encode_opening_tag(buffer, 1);
+        /* objectIdentifier [0] */
+        encode_context_object_id(buffer, 0, value.monitoredObjectIdentifier.type,
+            value.monitoredObjectIdentifier.instance);
+        /* propertyIdentifier [1] */
+        /* FIXME: we are monitoring 2 properties! How to encode? */
+        encode_context_enumerated(buffer, 1, value.monitoredProperty.propertyIdentifier);
+        if (value.monitoredProperty.propertyArrayIndex != BACNET_ARRAY_ALL)
+            encode_context_unsigned(buffer, 2, value.monitoredProperty.propertyArrayIndex);
+        /* MonitoredPropertyReference [1] - closing */
+        encode_closing_tag(buffer, 1);
+
+        /* IssueConfirmedNotifications [2] BOOLEAN, */
+        encode_context_boolean(buffer, 2, value.IssueConfirmedNotifications);
+        /* TimeRemaining [3] Unsigned, */
+        encode_context_unsigned(buffer, 3, value.TimeRemaining);
+        /* COVIncrement [4] REAL OPTIONAL, */
+        if (value.COVIncrement > 0)
+            encode_context_real(buffer, 4, value.COVIncrement);
+    }
+
+    public static int decode_cov_subscription(byte[] buffer, int offset, int apduLen, out BacnetCOVSubscription value)
+    {
+        var len = 0;
+
+        value = new BacnetCOVSubscription { Recipient = new BacnetAddress(BacnetAddressTypes.None, 0, null) };
+
+        if (!decode_is_opening_tag_number(buffer, offset + len, 0))
+            return -1;
+        len++;
+        if (!decode_is_opening_tag_number(buffer, offset + len, 0))
+            return -1;
+        len++;
+        if (!decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+        len += decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+            return -1;
+        len += decode_unsigned(buffer, offset + len, lenValueType, out var tmp);
+        value.Recipient.net = (ushort)tmp;
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING)
+            return -1;
+        value.Recipient.adr = new byte[lenValueType];
+        len += decode_octet_string(buffer, offset + len, apduLen, value.Recipient.adr, 0, lenValueType);
+        if (!decode_is_closing_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+        if (!decode_is_closing_tag_number(buffer, offset + len, 0))
+            return -1;
+        len++;
+
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != 1)
+            return -1;
+        len += decode_unsigned(buffer, offset + len, lenValueType, out value.subscriptionProcessIdentifier);
+        if (!decode_is_closing_tag_number(buffer, offset + len, 0))
+            return -1;
+        len++;
+
+        if (!decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != 0)
+            return -1;
+        len += decode_object_id(buffer, offset + len, out value.monitoredObjectIdentifier.type,
+            out value.monitoredObjectIdentifier.instance);
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != 1)
+            return -1;
+        len += decode_enumerated(buffer, offset + len, lenValueType,
+            out value.monitoredProperty.propertyIdentifier);
+        var tagLen = decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber == 2)
+        {
+            len += tagLen;
+            len += decode_unsigned(buffer, offset + len, lenValueType,
+                out value.monitoredProperty.propertyArrayIndex);
+        }
+        else
+            value.monitoredProperty.propertyArrayIndex = BACNET_ARRAY_ALL;
+        if (!decode_is_closing_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != 2)
+            return -1;
+        value.IssueConfirmedNotifications = buffer[offset + len] > 0;
+        len++;
+
+        len += decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber != 3)
+            return -1;
+        len += decode_unsigned(buffer, offset + len, lenValueType, out value.TimeRemaining);
+
+        if (len < apduLen && !IS_CLOSING_TAG(buffer[offset + len]))
+        {
+            decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            if (tagNumber != 4)
+                return len;
+            len++;
+            len += decode_real(buffer, offset + len, out value.COVIncrement);
+        }
+
+        return len;
+    }
+
+    public static int decode_context_property_state(byte[] buffer, int offset, byte tagNumber, out BacnetPropertyState value)
+    {
+        if (!decode_is_opening_tag_number(buffer, offset, tagNumber))
+        {
+            value = default;
+            return -1;
+        }
+
+        var len = 1;
+        var sectionLength = decode_property_state(buffer, offset + len, out value);
+        if (sectionLength == -1)
+            return -1;
+
+        len += sectionLength;
+        if (!decode_is_closing_tag_number(buffer, offset + len, tagNumber))
+            return -1;
+
+        return len + 1;
+    }
+
+    public static int decode_property_state(byte[] buffer, int offset, out BacnetPropertyState value)
+    {
+        value = default;
+
+        var len = decode_tag_number_and_value(buffer, offset, out value.tag, out uint lenValueType);
+        if (len == -1)
+            return -1;
+
+        var sectionLength = 0;
+        switch (value.tag)
+        {
+            case BacnetPropertyState.BacnetPropertyStateTypes.BOOLEAN_VALUE:
+                value.state.boolean_value = lenValueType == 1;
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.BINARY_VALUE:
+                sectionLength = decode_enumerated(buffer, offset + len, lenValueType, out value.state.binaryValue);
+                if (sectionLength == -1)
+                    return -1;
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.EVENT_TYPE:
+                sectionLength = decode_enumerated(buffer, offset + len, lenValueType, out value.state.eventType);
+                if (sectionLength == -1)
+                    return -1;
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.STATE:
+                sectionLength = decode_enumerated(buffer, offset + len, lenValueType, out value.state.state);
+                if (sectionLength == -1)
+                    return -1;
+                break;
+
+            case BacnetPropertyState.BacnetPropertyStateTypes.UNSIGNED_VALUE:
+                sectionLength = decode_unsigned(buffer, offset + len, lenValueType, out value.state.unsignedValue);
+                if (sectionLength == -1)
+                    return -1;
+                break;
+
+            default:
+                return -1;
+        }
+
+        return len + sectionLength;
+    }
+
+    public static int decode_context_bitstring(byte[] buffer, int offset, byte tagNumber, out BacnetBitString value)
+    {
+        if (!decode_is_context_tag(buffer, offset, tagNumber) || decode_is_closing_tag(buffer, offset))
+        {
+            value = new BacnetBitString();
+            return -1; // BACNET_STATUS_ERROR
+        }
+
+        var len = decode_tag_number_and_value(buffer, offset, out _, out var lenValue);
+        return len + decode_bitstring(buffer, offset + len, lenValue, out value);
+    }
+
+    public static int decode_context_real(byte[] buffer, int offset, byte tagNumber, out float value)
+    {
+        if (!decode_is_context_tag(buffer, offset, tagNumber))
+        {
+            value = 0;
+            return -1;
+        }
+
+        var len = decode_tag_number_and_value(buffer, offset, out _, out _);
+        return len + decode_real(buffer, offset + len, out value);
+    }
+
+    public static int decode_context_enumerated<TEnum>(byte[] buffer, int offset, byte tagNumber, out TEnum value)
+    {
+        if (!decode_is_context_tag(buffer, offset, tagNumber) || decode_is_closing_tag(buffer, offset))
+        {
+            value = default;
+            return -1;
+        }
+
+        var len = decode_tag_number_and_value(buffer, offset, out _, out var lenValue);
+        return len + decode_enumerated(buffer, offset + len, lenValue, out value);
+    }
+
+    public static int decode_context_unsigned(byte[] buffer, int offset, byte tagNumber, out uint value)
+    {
+        if (!decode_is_context_tag(buffer, offset, tagNumber) || decode_is_closing_tag(buffer, offset))
+        {
+            value = 0;
+            return -1;
+        }
+
+        var len = decode_tag_number_and_value(buffer, offset, out _, out var lenValue);
+        return len + decode_unsigned(buffer, offset + len, lenValue, out value);
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/BVLC.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/BVLC.cs
new file mode 100644
index 0000000..ca62f0e
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/BVLC.cs
@@ -0,0 +1,416 @@
+namespace System.IO.BACnet.Serialize;
+
+// Special thanks to VTS tool (BBMD services not activated but programmed !) and Steve Karg stack
+public class BVLC
+{
+    public delegate void BVLCMessageReceiveHandler(IPEndPoint sender, BacnetBvlcFunctions function, BacnetBvlcResults result, object data);
+    public event BVLCMessageReceiveHandler MessageReceived;
+
+    private readonly BacnetIpUdpProtocolTransport _myBbmdTransport;
+    readonly string _broadcastAdd;
+    private bool _bbmdFdServiceActivated;
+
+    public const byte BVLL_TYPE_BACNET_IP = 0x81;
+    public const byte BVLC_HEADER_LENGTH = 4;
+    public const BacnetMaxAdpu BVLC_MAX_APDU = BacnetMaxAdpu.MAX_APDU1476;
+
+    // Two lists for optional BBMD activity
+    readonly List<KeyValuePair<IPEndPoint, DateTime>> _foreignDevices = new();
+    private readonly List<KeyValuePair<IPEndPoint, IPAddress>> _bbmds = new();
+
+    // Contains the rules to accept FRD based on the IP adress
+    // If empty it's equal to *.*.*.*, everyone allows
+    private readonly List<Regex> _autorizedFdr = new();
+
+    public ILog Log { get; set; } = LogManager.GetLogger<BVLC>();
+
+    public BVLC(BacnetIpUdpProtocolTransport transport)
+    {
+        _myBbmdTransport = transport;
+        _broadcastAdd = _myBbmdTransport.GetBroadcastAddress().ToString().Split(':')[0];
+    }
+
+    public string FDList()
+    {
+        var sb = new StringBuilder();
+        lock (_foreignDevices)
+        {
+            // remove oldest Device entries (Time expiration > TTL + 30s delay)
+            _foreignDevices.Remove(_foreignDevices.Find(item => DateTime.Now > item.Value));
+
+            foreach (var client in _foreignDevices)
+                sb.Append($"{client.Key.Address}:{client.Key.Port};");
+        }
+        return sb.ToString();
+    }
+
+    public void AddFDRAutorisationRule(Regex ipRule)
+    {
+        _autorizedFdr.Add(ipRule);
+    }
+
+    // Used to initiate the BBMD & FD behaviour, if BBMD is null it start the FD activity only
+    public void AddBBMDPeer(IPEndPoint bbmd, IPAddress mask)
+    {
+        _bbmdFdServiceActivated = true;
+
+        if (bbmd == null)
+            return;
+
+        lock (_bbmds)
+            _bbmds.Add(new KeyValuePair<IPEndPoint, IPAddress>(bbmd, mask));
+    }
+
+    // Add a FD to the table or renew it
+    private void RegisterForeignDevice(IPEndPoint sender, int ttl)
+    {
+        lock (_foreignDevices)
+        {
+            // remove it, if any
+            _foreignDevices.Remove(_foreignDevices.Find(item => item.Key.Equals(sender)));
+            // TTL + 30s grace period
+            var expiration = DateTime.Now.AddSeconds(ttl + 30);
+            // add it
+            if (_autorizedFdr.Count == 0) // No rules, accept all
+            {
+                _foreignDevices.Add(new KeyValuePair<IPEndPoint, DateTime>(sender, expiration));
+                return;
+            }
+            foreach (var r in _autorizedFdr)
+            {
+                if (r.Match(sender.Address.ToString()).Success)
+                {
+                    _foreignDevices.Add(new KeyValuePair<IPEndPoint, DateTime>(sender, expiration));
+                    return;
+                }
+            }
+            Log.Info($"Rejected FDR registration, IP : {sender.Address}");
+        }
+    }
+
+    // Send a Frame to each registered foreign devices, except the original sender
+    private void SendToFDs(byte[] buffer, int msgLength, IPEndPoint ePsender = null)
+    {
+        lock (_foreignDevices)
+        {
+            // remove oldest Device entries (Time expiration > TTL + 30s delay)
+            _foreignDevices.Remove(_foreignDevices.Find(item => DateTime.Now > item.Value));
+            // Send to all others, except the original sender
+            foreach (var client in _foreignDevices)
+            {
+                if (!client.Key.Equals(ePsender))
+                    _myBbmdTransport.Send(buffer, msgLength, client.Key);
+            }
+        }
+    }
+
+    private static IPEndPoint BBMDSentAdd(IPEndPoint bbmd, IPAddress mask)
+    {
+        var bm = mask.GetAddressBytes();
+        var bip = bbmd.Address.GetAddressBytes();
+
+        /* annotation in Steve Karg bacnet stack :
+
+        The B/IP address to which the Forwarded-NPDU message is
+        sent is formed by inverting the broadcast distribution
+        mask in the BDT entry and logically ORing it with the
+        BBMD address of the same entry. This process
+        produces either the directed broadcast address of the remote
+        subnet or the unicast address of the BBMD on that subnet
+        depending on the contents of the broadcast distribution
+        mask. 
+
+        remark from me :
+           for instance remote BBMD 192.168.0.1 - mask 255.255.255.255
+                messages are forward directly to 192.168.0.1
+           remote BBMD 192.168.0.1 - mask 255.255.255.0
+                messages are forward to 192.168.0.255, ie certainly the local broadcast
+                address, but these datagrams are generaly destroy by the final IP router
+         */
+
+        for (var i = 0; i < bm.Length; i++)
+            bip[i] = (byte)(bip[i] | ~bm[i]);
+
+        return new IPEndPoint(new IPAddress(bip), bbmd.Port);
+    }
+
+    // Send a Frame to each registered BBMD except the original sender
+    private void SendToBbmDs(byte[] buffer, int msgLength)
+    {
+        lock (_bbmds)
+        {
+            foreach (var e in _bbmds)
+            {
+                var endpoint = BBMDSentAdd(e.Key, e.Value);
+                _myBbmdTransport.Send(buffer, msgLength, endpoint);
+            }
+        }
+    }
+
+    private static void First4BytesHeaderEncode(IList<byte> b, BacnetBvlcFunctions function, int msgLength)
+    {
+        b[0] = BVLL_TYPE_BACNET_IP;
+        b[1] = (byte)function;
+        b[2] = (byte)((msgLength & 0xFF00) >> 8);
+        b[3] = (byte)((msgLength & 0x00FF) >> 0);
+    }
+
+    private void Forward_NPDU(byte[] buffer, int msgLength, bool toGlobalBroadcast, IPEndPoint ePsender)
+    {
+        // Forms the forwarded NPDU from the original one, and send it to all
+        // orignal     - 4 bytes BVLC -  NPDU  - APDU
+        // change to   -  10 bytes BVLC  -  NPDU  - APDU
+
+        // copy, 6 bytes shifted
+        var b = new byte[msgLength + 6];    // normaly only 'small' frames are present here, so no need to check if it's to big for Udp
+        Array.Copy(buffer, 0, b, 6, msgLength);
+
+        // 10 bytes for the BVLC Header, with the embedded 6 bytes IP:Port of the original sender
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_FORWARDED_NPDU, msgLength + 6);
+        BacnetIpUdpProtocolTransport.Convert(ePsender, out var bacSender); // to embbed in the forward BVLC header
+        for (var i = 0; i < bacSender.adr.Length; i++)
+            b[4 + i] = bacSender.adr[i];
+
+        // To BBMD
+        SendToBbmDs(b, msgLength + 6);
+        // To FD, except the sender
+        SendToFDs(b, msgLength + 6, ePsender);
+        // Broadcast if required
+        if (toGlobalBroadcast)
+            _myBbmdTransport.Send(b, msgLength + 6, new IPEndPoint(IPAddress.Parse(_broadcastAdd), _myBbmdTransport.SharedPort));
+    }
+
+    // Send ack or nack
+    private void SendResult(IPEndPoint sender, BacnetBvlcResults resultCode)
+    {
+        var b = new byte[6];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_RESULT, 6);
+        b[4] = (byte)(((ushort)resultCode & 0xFF00) >> 8);
+        b[5] = (byte)((ushort)resultCode & 0xFF);
+
+        _myBbmdTransport.Send(b, 6, sender);
+    }
+
+    public void SendRegisterAsForeignDevice(IPEndPoint bbmd, short ttl)
+    {
+        var b = new byte[6];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_REGISTER_FOREIGN_DEVICE, 6);
+        b[4] = (byte)((ttl & 0xFF00) >> 8);
+        b[5] = (byte)(ttl & 0xFF);
+        _myBbmdTransport.Send(b, 6, bbmd);
+    }
+
+    public void SendReadBroadCastTable(IPEndPoint bbmd)
+    {
+        var b = new byte[4];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_READ_BROADCAST_DIST_TABLE, 4);
+        _myBbmdTransport.Send(b, 4, bbmd);
+    }
+
+    public void SendReadFDRTable(IPEndPoint bbmd)
+    {
+        var b = new byte[4];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_READ_FOREIGN_DEVICE_TABLE, 4);
+        _myBbmdTransport.Send(b, 4, bbmd);
+    }
+
+    public void SendWriteBroadCastTable(IPEndPoint bbmd, List<Tuple<IPEndPoint, IPAddress>> entries)
+    {
+        var b = new byte[4 + 10 * entries.Count];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_WRITE_BROADCAST_DISTRIBUTION_TABLE, 4 + 10 * entries.Count);
+
+        for (var i = 0; i < entries.Count; i++)
+        {
+            Array.Copy(entries[i].Item1.Address.GetAddressBytes(), 0, b, 4 + i * 10, 4);
+            b[8 + i * 10] = (byte)(entries[i].Item1.Port >> 8);
+            b[9 + i * 10] = (byte)(entries[i].Item1.Port & 0xFF);
+            Array.Copy(entries[i].Item2.GetAddressBytes(), 0, b, 10 + i * 10, 4);
+        }
+
+        _myBbmdTransport.Send(b, 4 + 10 * entries.Count, bbmd);
+    }
+
+    public void SendDeleteForeignDeviceEntry(IPEndPoint bbmd, IPEndPoint foreignDevice)
+    {
+        var b = new byte[4 + 6];
+        First4BytesHeaderEncode(b, BacnetBvlcFunctions.BVLC_READ_FOREIGN_DEVICE_TABLE, 4 + 6);
+        Array.Copy(foreignDevice.Address.GetAddressBytes(), 0, b, 4, 4);
+        b[8] = (byte)(foreignDevice.Port >> 8);
+        b[9] = (byte)(foreignDevice.Port & 0xFF);
+        _myBbmdTransport.Send(b, 4 + 6, bbmd);
+    }
+
+    public void SendRemoteWhois(byte[] buffer, IPEndPoint bbmd, int msgLength)
+    {
+        Encode(buffer, 0, BacnetBvlcFunctions.BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK, msgLength);
+        _myBbmdTransport.Send(buffer, msgLength, bbmd);
+
+    }
+
+    // Encode is called by internal services if the BBMD is also an active device
+    public int Encode(byte[] buffer, int offset, BacnetBvlcFunctions function, int msgLength)
+    {
+        // offset always 0, we are the first after udp
+
+        // do the job
+        First4BytesHeaderEncode(buffer, function, msgLength);
+
+        // optional BBMD service
+        if (_bbmdFdServiceActivated && function == BacnetBvlcFunctions.BVLC_ORIGINAL_BROADCAST_NPDU)
+        {
+            var me = _myBbmdTransport.LocalEndPoint;
+            // just sometime working, enable to get the local ep, always 0.0.0.0 if the socket is open with
+            // System.Net.IPAddress.Any
+            // So in this case don't send a bad message
+            if (me.Address.ToString() != "0.0.0.0")
+                Forward_NPDU(buffer, msgLength, false, me);   // send to all BBMDs and FDs
+        }
+        return 4; // ready to send
+    }
+
+    // Decode is called each time an Udp Frame is received
+    public int Decode(byte[] buffer, int offset, out BacnetBvlcFunctions function, out int msgLength, IPEndPoint sender)
+    {
+        // offset always 0, we are the first after udp
+        // and a previous test by the caller guaranteed at least 4 bytes into the buffer
+
+        function = (BacnetBvlcFunctions)buffer[1];
+        msgLength = (buffer[2] << 8) | (buffer[3] << 0);
+        if (buffer[0] != BVLL_TYPE_BACNET_IP || buffer.Length != msgLength) return -1;
+
+        switch (function)
+        {
+            case BacnetBvlcFunctions.BVLC_RESULT:
+                var resultCode = (buffer[4] << 8) + buffer[5];
+                MessageReceived?.Invoke(sender, function, (BacnetBvlcResults)resultCode, null);
+                return 0;   // not for the upper layers
+
+            case BacnetBvlcFunctions.BVLC_ORIGINAL_UNICAST_NPDU:
+                return 4;   // only for the upper layers
+
+            case BacnetBvlcFunctions.BVLC_ORIGINAL_BROADCAST_NPDU: // Normaly received in an IP local or global broadcast packet
+                                                                   // Send to FDs & BBMDs, not broadcast or it will be made twice !
+                if (_bbmdFdServiceActivated)
+                    Forward_NPDU(buffer, msgLength, false, sender);
+                return 4;   // also for the upper layers
+
+            case BacnetBvlcFunctions.BVLC_FORWARDED_NPDU:   // Sent only by a BBMD, broadcast on it network, or broadcast demand by one of it's FDs
+                if (_bbmdFdServiceActivated && msgLength >= 10)
+                {
+                    bool ret;
+                    lock (_bbmds)
+                        ret = _bbmds.Exists(items => items.Key.Address.Equals(sender.Address));    // verify sender (@ not Port!) presence in the table
+
+                    if (ret)    // message from a know BBMD address, sent to all FDs and broadcast
+                    {
+                        SendToFDs(buffer, msgLength);  // send without modification
+
+                        // Assume all BVLC_FORWARDED_NPDU are directly sent to me in the 
+                        // unicast mode and not by the way of the local broadcast address
+                        // ie my mask must be 255.255.255.255 in the others BBMD tables
+                        // If not, it's not really a big problem, devices on the local net will 
+                        // receive two times the message (after all it's just WhoIs, Iam, ...)
+                        _myBbmdTransport.Send(buffer, msgLength, new IPEndPoint(IPAddress.Parse(_broadcastAdd), _myBbmdTransport.SharedPort));
+                    }
+                }
+
+                return 10;  // also for the upper layers
+
+            case BacnetBvlcFunctions.BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK:  // Sent by a Foreign Device, not a BBMD
+                if (_bbmdFdServiceActivated)
+                {
+                    // Send to FDs except the sender, BBMDs and broadcast
+                    lock (_foreignDevices)
+                    {
+                        if (_foreignDevices.Exists(item => item.Key.Equals(sender))) // verify previous registration
+                            Forward_NPDU(buffer, msgLength, true, sender);
+                        else
+                            SendResult(sender, BacnetBvlcResults.BVLC_RESULT_DISTRIBUTE_BROADCAST_TO_NETWORK_NAK);
+                    }
+                }
+                return 0;   // not for the upper layers
+
+            case BacnetBvlcFunctions.BVLC_REGISTER_FOREIGN_DEVICE:
+                if (_bbmdFdServiceActivated && msgLength == 6)
+                {
+                    var ttl = (buffer[4] << 8) + buffer[5]; // unit is second
+                    RegisterForeignDevice(sender, ttl);
+                    SendResult(sender, BacnetBvlcResults.BVLC_RESULT_SUCCESSFUL_COMPLETION);  // ack
+                }
+                return 0;  // not for the upper layers
+
+            // We don't care about Read/Write operation in the BBMD/FDR tables (who realy use it ?)
+            case BacnetBvlcFunctions.BVLC_READ_FOREIGN_DEVICE_TABLE:
+                SendResult(sender, BacnetBvlcResults.BVLC_RESULT_READ_FOREIGN_DEVICE_TABLE_NAK);
+                return 0;
+
+            case BacnetBvlcFunctions.BVLC_DELETE_FOREIGN_DEVICE_TABLE_ENTRY:
+                SendResult(sender, BacnetBvlcResults.BVLC_RESULT_DELETE_FOREIGN_DEVICE_TABLE_ENTRY_NAK);
+                return 0;
+
+            case BacnetBvlcFunctions.BVLC_READ_BROADCAST_DIST_TABLE:
+                SendResult(sender, BacnetBvlcResults.BVLC_RESULT_READ_BROADCAST_DISTRIBUTION_TABLE_NAK);
+                return 0;
+
+            case BacnetBvlcFunctions.BVLC_WRITE_BROADCAST_DISTRIBUTION_TABLE:
+            case BacnetBvlcFunctions.BVLC_READ_BROADCAST_DIST_TABLE_ACK:
+                {
+                    var nbEntries = (msgLength - 4) / 10;
+                    var entries = new List<Tuple<IPEndPoint, IPAddress>>();
+
+                    for (var i = 0; i < nbEntries; i++)
+                    {
+                        long add = BitConverter.ToInt32(buffer, 4 + i * 10);
+
+                        Array.Reverse(buffer, 8 + i * 10, 2);
+                        var port = BitConverter.ToUInt16(buffer, 8 + i * 10);
+
+                        // new IPAddress(long) with 255.255.255.255 (ie -1) not OK
+                        var mask = new byte[4];
+                        Array.Copy(buffer, 10 + i * 10, mask, 0, 4);
+
+                        var entry = Tuple.Create(new IPEndPoint(new IPAddress(add), port), new IPAddress(mask));
+                        entries.Add(entry);
+                    }
+
+                    if (MessageReceived != null && function == BacnetBvlcFunctions.BVLC_READ_BROADCAST_DIST_TABLE_ACK)
+                        MessageReceived(sender, function, BacnetBvlcResults.BVLC_RESULT_SUCCESSFUL_COMPLETION, entries);
+
+                    // Today we don't accept it
+                    if (function == BacnetBvlcFunctions.BVLC_WRITE_BROADCAST_DISTRIBUTION_TABLE)
+                        SendResult(sender, BacnetBvlcResults.BVLC_RESULT_WRITE_BROADCAST_DISTRIBUTION_TABLE_NAK);
+
+                    return 0;
+                }
+
+            case BacnetBvlcFunctions.BVLC_READ_FOREIGN_DEVICE_TABLE_ACK:
+                {
+                    var nbEntries = (msgLength - 4) / 10;
+                    var entries = new List<Tuple<IPEndPoint, ushort, ushort>>();
+
+                    for (var i = 0; i < nbEntries; i++)
+                    {
+                        long add = BitConverter.ToInt32(buffer, 4 + i * 10);
+
+                        Array.Reverse(buffer, 8 + i * 10, 2);
+                        var port = BitConverter.ToUInt16(buffer, 8 + i * 10);
+
+                        Array.Reverse(buffer, 10 + i * 10, 2);
+                        var ttl = BitConverter.ToUInt16(buffer, 10 + i * 10);
+                        Array.Reverse(buffer, 12 + i * 10, 2);
+                        var remainTtl = BitConverter.ToUInt16(buffer, 12 + i * 10);
+
+                        var entry = Tuple.Create(new IPEndPoint(new IPAddress(add), port), ttl, remainTtl);
+                        entries.Add(entry);
+                    }
+
+                    MessageReceived?.Invoke(sender, function, BacnetBvlcResults.BVLC_RESULT_SUCCESSFUL_COMPLETION, entries);
+                    return 0;
+                }
+
+            // error encoding function or experimental one
+            default:
+                return -1;
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeBuffer.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeBuffer.cs
new file mode 100644
index 0000000..c7113d7
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeBuffer.cs
@@ -0,0 +1,117 @@
+namespace System.IO.BACnet.Serialize;
+
+public class EncodeBuffer
+{
+    public byte[] buffer;           //buffer to serialize into
+    public int offset;              //offset in buffer ... will go beyond max_offset (so that you may count what's needed)
+    public int max_offset;          //don't write beyond this offset 
+    public int serialize_counter;   //used with 'min_limit'
+    public int min_limit;           //don't write before this limit (used for segmentation)
+    public EncodeResult result;
+    public bool expandable;
+
+    public EncodeBuffer()
+    {
+        expandable = true;
+        buffer = new byte[128];
+        max_offset = buffer.Length - 1;
+    }
+
+    public EncodeBuffer(byte[] buffer, int offset)
+    {
+        if (buffer == null) buffer = new byte[0];
+        expandable = false;
+        this.buffer = buffer;
+        this.offset = offset;
+        max_offset = buffer.Length;
+    }
+
+    public void Increment()
+    {
+        if (offset < max_offset)
+        {
+            if (serialize_counter >= min_limit)
+                offset++;
+            serialize_counter++;
+        }
+        else
+        {
+            if (serialize_counter >= min_limit)
+                offset++;
+        }
+    }
+
+    public void Add(byte b)
+    {
+        if (offset < max_offset)
+        {
+            if (serialize_counter >= min_limit)
+                buffer[offset] = b;
+        }
+        else
+        {
+            if (expandable)
+            {
+                Array.Resize(ref buffer, buffer.Length * 2);
+                max_offset = buffer.Length - 1;
+                if (serialize_counter >= min_limit)
+                    buffer[offset] = b;
+            }
+            else
+                result |= EncodeResult.NotEnoughBuffer;
+        }
+
+        Increment();
+    }
+
+    public void Add(byte[] buffer, int count)
+    {
+        for (var i = 0; i < count; i++)
+            Add(buffer[i]);
+    }
+
+    public int GetDiff(EncodeBuffer buffer)
+    {
+        var diff = Math.Abs(buffer.offset - offset);
+        diff = Math.Max(Math.Abs(buffer.serialize_counter - serialize_counter), diff);
+        return diff;
+    }
+
+    public EncodeBuffer Copy()
+    {
+        return new EncodeBuffer
+        {
+            buffer = buffer,
+            max_offset = max_offset,
+            min_limit = min_limit,
+            offset = offset,
+            result = result,
+            serialize_counter = serialize_counter,
+            expandable = expandable
+        };
+    }
+
+    public byte[] ToArray()
+    {
+        var ret = new byte[offset];
+        Array.Copy(buffer, 0, ret, 0, ret.Length);
+        return ret;
+    }
+
+    public void Reset(int newOffset)
+    {
+        offset = newOffset;
+        serialize_counter = 0;
+        result = EncodeResult.Good;
+    }
+
+    public override string ToString()
+    {
+        return offset + " - " + serialize_counter;
+    }
+
+    public int GetLength()
+    {
+        return Math.Min(offset, max_offset);
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeResult.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeResult.cs
new file mode 100644
index 0000000..2051215
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/EncodeResult.cs
@@ -0,0 +1,8 @@
+namespace System.IO.BACnet.Serialize;
+
+[Flags]
+public enum EncodeResult
+{
+    Good = 0,
+    NotEnoughBuffer = 1
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/MSTP.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/MSTP.cs
new file mode 100644
index 0000000..795ff40
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/MSTP.cs
@@ -0,0 +1,107 @@
+namespace System.IO.BACnet.Serialize;
+
+public class MSTP
+{
+    public const byte MSTP_PREAMBLE1 = 0x55;
+    public const byte MSTP_PREAMBLE2 = 0xFF;
+    public const BacnetMaxAdpu MSTP_MAX_APDU = BacnetMaxAdpu.MAX_APDU480;
+    public const byte MSTP_HEADER_LENGTH = 8;
+
+    public static byte CRC_Calc_Header(byte dataValue, byte crcValue)
+    {
+        var crc = (ushort)(crcValue ^ dataValue);
+
+        /* Exclusive OR the terms in the table (top down) */
+        crc = (ushort)(crc ^ (crc << 1) ^ (crc << 2) ^ (crc << 3) ^ (crc << 4) ^ (crc << 5) ^ (crc << 6) ^ (crc << 7));
+
+        /* Combine bits shifted out left hand end */
+        return (byte)((crc & 0xfe) ^ ((crc >> 8) & 1));
+    }
+
+    public static byte CRC_Calc_Header(byte[] buffer, int offset, int length)
+    {
+        byte crc = 0xff;
+        for (var i = offset; i < offset + length; i++)
+            crc = CRC_Calc_Header(buffer[i], crc);
+        return (byte)~crc;
+    }
+
+    public static ushort CRC_Calc_Data(byte dataValue, ushort crcValue)
+    {
+        var crcLow = (ushort)((crcValue & 0xff) ^ dataValue);
+
+        /* Exclusive OR the terms in the table (top down) */
+        return (ushort)((crcValue >> 8) ^ (crcLow << 8) ^ (crcLow << 3)
+            ^ (crcLow << 12) ^ (crcLow >> 4)
+            ^ (crcLow & 0x0f) ^ ((crcLow & 0x0f) << 7));
+    }
+
+    public static ushort CRC_Calc_Data(byte[] buffer, int offset, int length)
+    {
+        ushort crc = 0xffff;
+        for (var i = offset; i < offset + length; i++)
+            crc = CRC_Calc_Data(buffer[i], crc);
+        return (ushort)~crc;
+    }
+
+    public static int Encode(byte[] buffer, int offset, BacnetMstpFrameTypes frameType, byte destinationAddress, byte sourceAddress, int msgLength)
+    {
+        buffer[offset + 0] = MSTP_PREAMBLE1;
+        buffer[offset + 1] = MSTP_PREAMBLE2;
+        buffer[offset + 2] = (byte)frameType;
+        buffer[offset + 3] = destinationAddress;
+        buffer[offset + 4] = sourceAddress;
+        buffer[offset + 5] = (byte)((msgLength & 0xFF00) >> 8);
+        buffer[offset + 6] = (byte)((msgLength & 0x00FF) >> 0);
+        buffer[offset + 7] = CRC_Calc_Header(buffer, offset + 2, 5);
+        if (msgLength > 0)
+        {
+            //calculate data crc
+            var dataCrc = CRC_Calc_Data(buffer, offset + 8, msgLength);
+            buffer[offset + 8 + msgLength + 0] = (byte)(dataCrc & 0xFF);  //LSB first!
+            buffer[offset + 8 + msgLength + 1] = (byte)(dataCrc >> 8);
+        }
+        //optional pad (0xFF)
+        return MSTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
+    }
+
+    public static int Decode(byte[] buffer, int offset, int maxLength, out BacnetMstpFrameTypes frameType, out byte destinationAddress, out byte sourceAddress, out int msgLength)
+    {
+        if (maxLength < MSTP_HEADER_LENGTH)  //not enough data
+        {
+            frameType = BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY; // don't care
+            destinationAddress = sourceAddress = 0;   // don't care
+            msgLength = 0;
+            return -1;
+        }
+
+        frameType = (BacnetMstpFrameTypes)buffer[offset + 2];
+        destinationAddress = buffer[offset + 3];
+        sourceAddress = buffer[offset + 4];
+        msgLength = (buffer[offset + 5] << 8) | (buffer[offset + 6] << 0);
+        var crcHeader = buffer[offset + 7];
+        ushort crcData = 0;
+
+        if (msgLength > 0)
+        {
+            if (offset + 8 + msgLength + 1 >= buffer.Length)
+                return -1;
+
+            crcData = (ushort)((buffer[offset + 8 + msgLength + 1] << 8) | (buffer[offset + 8 + msgLength + 0] << 0));
+        }
+
+        if (buffer[offset + 0] != MSTP_PREAMBLE1)
+            return -1;
+
+        if (buffer[offset + 1] != MSTP_PREAMBLE2)
+            return -1;
+
+        if (CRC_Calc_Header(buffer, offset + 2, 5) != crcHeader)
+            return -1;
+
+        if (msgLength > 0 && maxLength >= MSTP_HEADER_LENGTH + msgLength + 2 && CRC_Calc_Data(buffer, offset + 8, msgLength) != crcData)
+            return -1;
+
+        return 8 + msgLength + (msgLength > 0 ? 2 : 0);
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/NPDU.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/NPDU.cs
new file mode 100644
index 0000000..b4ce0f6
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/NPDU.cs
@@ -0,0 +1,134 @@
+namespace System.IO.BACnet.Serialize;
+
+public class NPDU
+{
+    public const byte BACNET_PROTOCOL_VERSION = 1;
+
+    public static BacnetNpduControls DecodeFunction(byte[] buffer, int offset)
+    {
+        if (buffer[offset + 0] != BACNET_PROTOCOL_VERSION) return 0;
+        return (BacnetNpduControls)buffer[offset + 1];
+    }
+
+    public static int Decode(byte[] buffer, int offset, out BacnetNpduControls function, out BacnetAddress destination,
+        out BacnetAddress source, out byte hopCount, out BacnetNetworkMessageTypes networkMsgType, out ushort vendorId)
+    {
+        var orgOffset = offset;
+
+        offset++;
+        function = (BacnetNpduControls)buffer[offset++];
+
+        destination = null;
+        if ((function & BacnetNpduControls.DestinationSpecified) == BacnetNpduControls.DestinationSpecified)
+        {
+            destination = new BacnetAddress(BacnetAddressTypes.None, (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0)), null);
+            int adrLen = buffer[offset++];
+            if (adrLen > 0)
+            {
+                destination.adr = new byte[adrLen];
+                for (var i = 0; i < destination.adr.Length; i++)
+                    destination.adr[i] = buffer[offset++];
+            }
+        }
+
+        source = null;
+        if ((function & BacnetNpduControls.SourceSpecified) == BacnetNpduControls.SourceSpecified)
+        {
+            source = new BacnetAddress(BacnetAddressTypes.None, (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0)), null);
+            int adrLen = buffer[offset++];
+            if (adrLen > 0)
+            {
+                source.adr = new byte[adrLen];
+                for (var i = 0; i < source.adr.Length; i++)
+                    source.adr[i] = buffer[offset++];
+            }
+        }
+
+        hopCount = 0;
+        if ((function & BacnetNpduControls.DestinationSpecified) == BacnetNpduControls.DestinationSpecified)
+        {
+            hopCount = buffer[offset++];
+        }
+
+        networkMsgType = BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK;
+        vendorId = 0;
+        if (function.HasFlag(BacnetNpduControls.NetworkLayerMessage))
+        {
+            networkMsgType = (BacnetNetworkMessageTypes)buffer[offset++];
+            if ((byte)networkMsgType >= 0x80)
+            {
+                vendorId = (ushort)((buffer[offset++] << 8) | (buffer[offset++] << 0));
+            }
+            //DAL - this originally made no sense as the higher level code would just ignore network messages
+            //                else if (networkMsgType == BacnetNetworkMessageTypes.NETWORK_MESSAGE_WHO_IS_ROUTER_TO_NETWORK)
+            //                    offset += 2;  // Don't care about destination network adress
+        }
+
+        if (buffer[orgOffset + 0] != BACNET_PROTOCOL_VERSION)
+            return -1;
+
+        return offset - orgOffset;
+    }
+
+    public static void Encode(EncodeBuffer buffer, BacnetNpduControls function, BacnetAddress destination,
+        BacnetAddress source, byte hopCount, BacnetNetworkMessageTypes networkMsgType, ushort vendorId)
+    {
+        Encode(buffer, function, destination, source, hopCount);
+
+        if (function.HasFlag(BacnetNpduControls.NetworkLayerMessage)) // sure it is, otherwise the other Encode is used
+        {
+            buffer.buffer[buffer.offset++] = (byte)networkMsgType;
+            if ((byte)networkMsgType >= 0x80) // who used this ??? sure nobody !
+            {
+                buffer.buffer[buffer.offset++] = (byte)((vendorId & 0xFF00) >> 8);
+                buffer.buffer[buffer.offset++] = (byte)((vendorId & 0x00FF) >> 0);
+            }
+        }
+    }
+
+    public static void Encode(EncodeBuffer buffer, BacnetNpduControls function, BacnetAddress destination,
+        BacnetAddress source = null, byte hopCount = 0xFF)
+    {
+        // Modif FC
+        var hasDestination = destination != null && destination.net > 0; // && destination.net != 0xFFFF;
+        var hasSource = source != null && source.net > 0 && source.net != 0xFFFF;
+
+        buffer.buffer[buffer.offset++] = BACNET_PROTOCOL_VERSION;
+        buffer.buffer[buffer.offset++] = (byte)(function | (hasDestination ? BacnetNpduControls.DestinationSpecified : 0) | (hasSource ? BacnetNpduControls.SourceSpecified : 0));
+
+        if (hasDestination)
+        {
+            buffer.buffer[buffer.offset++] = (byte)((destination.net & 0xFF00) >> 8);
+            buffer.buffer[buffer.offset++] = (byte)((destination.net & 0x00FF) >> 0);
+
+            if (destination.net == 0xFFFF)                  //patch by F. Chaxel
+                buffer.buffer[buffer.offset++] = 0;
+            else
+            {
+                buffer.buffer[buffer.offset++] = (byte)destination.adr.Length;
+                if (destination.adr.Length > 0)
+                {
+                    foreach (var t in destination.adr)
+                        buffer.buffer[buffer.offset++] = t;
+                }
+            }
+        }
+
+        if (hasSource)
+        {
+            buffer.buffer[buffer.offset++] = (byte)((source.net & 0xFF00) >> 8);
+            buffer.buffer[buffer.offset++] = (byte)((source.net & 0x00FF) >> 0);
+            buffer.buffer[buffer.offset++] = (byte)source.adr.Length;
+            if (source.adr.Length > 0)
+            {
+                foreach (var t in source.adr)
+                    buffer.buffer[buffer.offset++] = t;
+            }
+        }
+
+        if (hasDestination)
+        {
+            buffer.buffer[buffer.offset++] = hopCount;
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/PTP.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/PTP.cs
new file mode 100644
index 0000000..4c5a5a6
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/PTP.cs
@@ -0,0 +1,67 @@
+namespace System.IO.BACnet.Serialize;
+
+public class PTP
+{
+    public const byte PTP_PREAMBLE1 = 0x55;
+    public const byte PTP_PREAMBLE2 = 0xFF;
+    public const byte PTP_GREETING_PREAMBLE1 = 0x42;
+    public const byte PTP_GREETING_PREAMBLE2 = 0x41;
+    public const BacnetMaxAdpu PTP_MAX_APDU = BacnetMaxAdpu.MAX_APDU480;
+    public const byte PTP_HEADER_LENGTH = 6;
+
+    public static int Encode(byte[] buffer, int offset, BacnetPtpFrameTypes frameType, int msgLength)
+    {
+        buffer[offset + 0] = PTP_PREAMBLE1;
+        buffer[offset + 1] = PTP_PREAMBLE2;
+        buffer[offset + 2] = (byte)frameType;
+        buffer[offset + 3] = (byte)((msgLength & 0xFF00) >> 8);
+        buffer[offset + 4] = (byte)((msgLength & 0x00FF) >> 0);
+        buffer[offset + 5] = MSTP.CRC_Calc_Header(buffer, offset + 2, 3);
+        if (msgLength > 0)
+        {
+            //calculate data crc
+            var dataCrc = MSTP.CRC_Calc_Data(buffer, offset + 6, msgLength);
+            buffer[offset + 6 + msgLength + 0] = (byte)(dataCrc & 0xFF);  //LSB first!
+            buffer[offset + 6 + msgLength + 1] = (byte)(dataCrc >> 8);
+        }
+        return PTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
+    }
+
+    public static int Decode(byte[] buffer, int offset, int maxLength, out BacnetPtpFrameTypes frameType, out int msgLength)
+    {
+        if (maxLength < PTP_HEADER_LENGTH) // not enough data
+        {
+            frameType = BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_REQUEST; // don't care
+            msgLength = 0;
+            return -1;     //not enough data
+        }
+
+        frameType = (BacnetPtpFrameTypes)buffer[offset + 2];
+        msgLength = (buffer[offset + 3] << 8) | (buffer[offset + 4] << 0);
+        var crcHeader = buffer[offset + 5];
+        ushort crcData = 0;
+
+        if (msgLength > 0)
+        {
+            if (offset + 6 + msgLength + 1 >= buffer.Length)
+                return -1;
+
+            crcData = (ushort)((buffer[offset + 6 + msgLength + 1] << 8) | (buffer[offset + 6 + msgLength + 0] << 0));
+        }
+
+        if (buffer[offset + 0] != PTP_PREAMBLE1)
+            return -1;
+
+        if (buffer[offset + 1] != PTP_PREAMBLE2)
+            return -1;
+
+        if (MSTP.CRC_Calc_Header(buffer, offset + 2, 3) != crcHeader)
+            return -1;
+
+        if (msgLength > 0 && maxLength >= PTP_HEADER_LENGTH + msgLength + 2 && MSTP.CRC_Calc_Data(buffer, offset + 6, msgLength) != crcData)
+            return -1;
+
+        return 8 + msgLength + (msgLength > 0 ? 2 : 0);
+    }
+
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/Services.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/Services.cs
new file mode 100644
index 0000000..98728b4
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Serialize/Services.cs
@@ -0,0 +1,2664 @@
+namespace System.IO.BACnet.Serialize;
+
+public class Services
+{
+    public static void EncodeIamBroadcast(EncodeBuffer buffer, uint deviceId, uint maxApdu, BacnetSegmentations segmentation, ushort vendorId)
+    {
+        ASN1.encode_application_object_id(buffer, BacnetObjectTypes.OBJECT_DEVICE, deviceId);
+        ASN1.encode_application_unsigned(buffer, maxApdu);
+        ASN1.encode_application_enumerated(buffer, (uint)segmentation);
+        ASN1.encode_application_unsigned(buffer, vendorId);
+    }
+
+    public static int DecodeIamBroadcast(byte[] buffer, int offset, out uint deviceId, out uint maxApdu, out BacnetSegmentations segmentation, out ushort vendorId)
+    {
+        var apduLen = 0;
+        var orgOffset = offset;
+        BacnetObjectId objectId;
+
+        deviceId = 0;
+        maxApdu = 0;
+        segmentation = BacnetSegmentations.SEGMENTATION_NONE;
+        vendorId = 0;
+
+        /* OBJECT ID - object id */
+        var len = ASN1.decode_tag_number_and_value(buffer, offset + apduLen, out var tagNumber, out var lenValue);
+        apduLen += len;
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID)
+            return -1;
+        len = ASN1.decode_object_id(buffer, offset + apduLen, out objectId.type, out objectId.instance);
+        apduLen += len;
+        if (objectId.type != BacnetObjectTypes.OBJECT_DEVICE)
+            return -1;
+        deviceId = objectId.instance;
+        /* MAX APDU - unsigned */
+        len =
+            ASN1.decode_tag_number_and_value(buffer, offset + apduLen, out tagNumber, out lenValue);
+        apduLen += len;
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+            return -1;
+        len = ASN1.decode_unsigned(buffer, offset + apduLen, lenValue, out var decodedValue);
+        apduLen += len;
+        maxApdu = decodedValue;
+        /* Segmentation - enumerated */
+        len =
+            ASN1.decode_tag_number_and_value(buffer, offset + apduLen, out tagNumber, out lenValue);
+        apduLen += len;
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED)
+            return -1;
+        len = ASN1.decode_enumerated(buffer, offset + apduLen, lenValue, out decodedValue);
+        apduLen += len;
+        if (decodedValue > (uint)BacnetSegmentations.SEGMENTATION_NONE)
+            return -1;
+        segmentation = (BacnetSegmentations)decodedValue;
+        /* Vendor ID - unsigned16 */
+        len =
+            ASN1.decode_tag_number_and_value(buffer, offset + apduLen, out tagNumber, out lenValue);
+        apduLen += len;
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+            return -1;
+        ASN1.decode_unsigned(buffer, offset + apduLen, lenValue, out decodedValue);
+        if (decodedValue > 0xFFFF)
+            return -1;
+        vendorId = (ushort)decodedValue;
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeIhaveBroadcast(EncodeBuffer buffer, BacnetObjectId deviceId, BacnetObjectId objectId, string objectName)
+    {
+        /* deviceIdentifier */
+        ASN1.encode_application_object_id(buffer, deviceId.type, deviceId.instance);
+        /* objectIdentifier */
+        ASN1.encode_application_object_id(buffer, objectId.type, objectId.instance);
+        /* objectName */
+        ASN1.encode_application_character_string(buffer, objectName);
+    }
+
+    public static void EncodeWhoHasBroadcast(EncodeBuffer buffer, int lowLimit, int highLimit, BacnetObjectId? objectId, string objectName)
+    {
+        /* optional limits - must be used as a pair */
+        if (lowLimit >= 0 && lowLimit <= ASN1.BACNET_MAX_INSTANCE && highLimit >= 0 && highLimit <= ASN1.BACNET_MAX_INSTANCE)
+        {
+            ASN1.encode_context_unsigned(buffer, 0, (uint)lowLimit);
+            ASN1.encode_context_unsigned(buffer, 1, (uint)highLimit);
+        }
+        if (objectId != null)
+        {
+            ASN1.encode_context_object_id(buffer, 2, objectId.Value.type, objectId.Value.instance);
+        }
+        else
+        {
+            ASN1.encode_context_character_string(buffer, 3, objectName);
+        }
+    }
+
+    public static void EncodeWhoIsBroadcast(EncodeBuffer buffer, int lowLimit, int highLimit)
+    {
+        /* optional limits - must be used as a pair */
+        if (lowLimit >= 0 && lowLimit <= ASN1.BACNET_MAX_INSTANCE &&
+            highLimit >= 0 && highLimit <= ASN1.BACNET_MAX_INSTANCE)
+        {
+            ASN1.encode_context_unsigned(buffer, 0, (uint)lowLimit);
+            ASN1.encode_context_unsigned(buffer, 1, (uint)highLimit);
+        }
+    }
+
+    public static int DecodeWhoIsBroadcast(byte[] buffer, int offset, int apduLen, out int lowLimit, out int highLimit)
+    {
+        var len = 0;
+
+        lowLimit = -1;
+        highLimit = -1;
+
+        if (apduLen <= 0) return len;
+
+        /* optional limits - must be used as a pair */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue);
+        if (tagNumber != 0)
+            return -1;
+        if (apduLen > len)
+        {
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out var decodedValue);
+            if (decodedValue <= ASN1.BACNET_MAX_INSTANCE)
+                lowLimit = (int)decodedValue;
+            if (apduLen > len)
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+                if (tagNumber != 1)
+                    return -1;
+                if (apduLen > len)
+                {
+                    len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out decodedValue);
+                    if (decodedValue <= ASN1.BACNET_MAX_INSTANCE)
+                        highLimit = (int)decodedValue;
+                }
+                else
+                    return -1;
+            }
+            else
+                return -1;
+        }
+        else
+            return -1;
+
+        return len;
+    }
+
+    // Added by thamersalek
+    public static int DecodeWhoHasBroadcast(byte[] buffer, int offset, int apduLen, out int lowLimit, out int highLimit, out BacnetObjectId? objId, out string objName)
+    {
+        var len = 0;
+        uint decodedValue;
+
+        objName = null;
+        objId = null;
+        lowLimit = -1;
+        highLimit = -1;
+
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue);
+
+        if (tagNumber == 0)
+        {
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out decodedValue);
+            if (decodedValue <= ASN1.BACNET_MAX_INSTANCE)
+                lowLimit = (int)decodedValue;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+        }
+
+        if (tagNumber == 1)
+        {
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out decodedValue);
+            if (decodedValue <= ASN1.BACNET_MAX_INSTANCE)
+                highLimit = (int)decodedValue;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+        }
+
+        if (tagNumber == 2)
+        {
+            len += ASN1.decode_object_id(buffer, offset + len, out ushort objType, out var objInst);
+            objId = new BacnetObjectId((BacnetObjectTypes)objType, objInst);
+        }
+
+        if (tagNumber == 3)
+            len += ASN1.decode_character_string(buffer, offset + len, apduLen - (offset + len), lenValue, out objName);
+
+        return len;
+    }
+
+    public static void EncodeAlarmAcknowledge(EncodeBuffer buffer, uint ackProcessIdentifier, BacnetObjectId eventObjectIdentifier, uint eventStateAcked, string ackSource, BacnetGenericTime eventTimeStamp, BacnetGenericTime ackTimeStamp)
+    {
+        ASN1.encode_context_unsigned(buffer, 0, ackProcessIdentifier);
+        ASN1.encode_context_object_id(buffer, 1, eventObjectIdentifier.type, eventObjectIdentifier.instance);
+        ASN1.encode_context_enumerated(buffer, 2, eventStateAcked);
+        ASN1.bacapp_encode_context_timestamp(buffer, 3, eventTimeStamp);
+        ASN1.encode_context_character_string(buffer, 4, ackSource);
+        ASN1.bacapp_encode_context_timestamp(buffer, 5, ackTimeStamp);
+    }
+    // DAL
+    public static int DecodeAlarmAcknowledge(byte[] buffer, int offset, int apduLen, out uint ackProcessIdentifier, out BacnetObjectId eventObjectIdentifier, out uint eventStateAcked, out string ackSource, out BacnetGenericTime eventTimeStamp, out BacnetGenericTime ackTimeStamp)
+    {
+        eventTimeStamp = default;
+        ackTimeStamp = default;
+        ackSource = null;
+        var len = 0;
+        len += ASN1.decode_context_unsigned(buffer, offset + len, 0, out ackProcessIdentifier);
+        len += ASN1.decode_context_object_id(buffer, offset + len, 1, out ushort type, out eventObjectIdentifier.instance);
+        eventObjectIdentifier.type = (BacnetObjectTypes)type;
+        len += ASN1.decode_context_enumerated(buffer, offset + len, 2, out eventStateAcked);
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+        {
+            len += 2; // opening Tag 3 then 2
+            len += ASN1.decode_application_date(buffer, offset + len, out var date);
+            len += ASN1.decode_application_time(buffer, offset + len, out var time);
+            eventTimeStamp.Time = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute,
+                time.Second, time.Millisecond);
+
+            len += 2; // closing tag 2 then 3
+        }
+        else
+            return -1;
+        len += ASN1.decode_context_character_string(buffer, offset + len, 256, 4, out ackSource);
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 5))
+        {
+            len += 2; // opening Tag 5 then 2
+            len += ASN1.decode_application_date(buffer, offset + len, out var date);
+            len += ASN1.decode_application_time(buffer, offset + len, out var time);
+            ackTimeStamp.Time = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute,
+                time.Second, time.Millisecond);
+            len += 2; // closing tag 2 then 5
+        }
+        else
+            return -1;
+        return len;
+    }
+
+    public static void EncodeAtomicReadFile(EncodeBuffer buffer, bool isStream, BacnetObjectId objectId, int position, uint count)
+    {
+        ASN1.encode_application_object_id(buffer, objectId.type, objectId.instance);
+        var tagNumber = (byte)(isStream ? 0 : 1);
+        ASN1.encode_opening_tag(buffer, tagNumber);
+        ASN1.encode_application_signed(buffer, position);
+        ASN1.encode_application_unsigned(buffer, count);
+        ASN1.encode_closing_tag(buffer, tagNumber);
+    }
+
+    public static int DecodeAtomicReadFile(byte[] buffer, int offset, int apduLen, out bool isStream, out BacnetObjectId objectId, out int position, out uint count)
+    {
+        var len = 0;
+        int tagLen;
+
+        isStream = true;
+        objectId = new BacnetObjectId();
+        position = -1;
+        count = 0;
+
+        len = ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID)
+            return -1;
+        len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+        if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 0))
+        {
+            /* a tag number is not extended so only one octet */
+            len++;
+            /* fileStartPosition */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+                return -1;
+            len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+            /* requestedOctetCount */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+                return -1;
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out count);
+            if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 0))
+                return -1;
+            /* a tag number is not extended so only one octet */
+            len++;
+        }
+        else if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 1))
+        {
+            isStream = false;
+            /* a tag number is not extended so only one octet */
+            len++;
+            /* fileStartRecord */
+            tagLen =
+                ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber,
+                out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+                return -1;
+            len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+            /* RecordCount */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+                return -1;
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out count);
+            if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 1))
+                return -1;
+            /* a tag number is not extended so only one octet */
+            len++;
+        }
+        else
+            return -1;
+
+        return len;
+    }
+
+    public static void EncodeAtomicReadFileAcknowledge(EncodeBuffer buffer, bool isStream, bool endOfFile, int position, uint blockCount, byte[][] blocks, int[] counts)
+    {
+        ASN1.encode_application_boolean(buffer, endOfFile);
+        var tagNumber = (byte)(isStream ? 0 : 1);
+        ASN1.encode_opening_tag(buffer, tagNumber);
+        ASN1.encode_application_signed(buffer, position);
+
+        if (isStream)
+        {
+            ASN1.encode_application_octet_string(buffer, blocks[0], 0, counts[0]);
+        }
+        else
+        {
+            ASN1.encode_application_unsigned(buffer, blockCount);
+            for (var i = 0; i < blockCount; i++)
+                ASN1.encode_application_octet_string(buffer, blocks[i], 0, counts[i]);
+        }
+
+        ASN1.encode_closing_tag(buffer, tagNumber);
+    }
+
+    public static void EncodeAtomicWriteFile(EncodeBuffer buffer, bool isStream, BacnetObjectId objectId, int position, uint blockCount, byte[][] blocks, int[] counts)
+    {
+        ASN1.encode_application_object_id(buffer, objectId.type, objectId.instance);
+        var tagNumber = (byte)(isStream ? 0 : 1);
+
+        ASN1.encode_opening_tag(buffer, tagNumber);
+        ASN1.encode_application_signed(buffer, position);
+
+        if (isStream)
+        {
+            ASN1.encode_application_octet_string(buffer, blocks[0], 0, counts[0]);
+        }
+        else
+        {
+            ASN1.encode_application_unsigned(buffer, blockCount);
+            for (var i = 0; i < blockCount; i++)
+                ASN1.encode_application_octet_string(buffer, blocks[i], 0, counts[i]);
+        }
+
+        ASN1.encode_closing_tag(buffer, tagNumber);
+    }
+
+    public static int DecodeAtomicWriteFile(byte[] buffer, int offset, int apduLen, out bool isStream, out BacnetObjectId objectId, out int position, out uint blockCount, out byte[][] blocks, out int[] counts)
+    {
+        var len = 0;
+        int tagLen;
+
+        objectId = new BacnetObjectId();
+        isStream = true;
+        position = -1;
+        blockCount = 0;
+        blocks = null;
+        counts = null;
+
+        len = ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID)
+            return -1;
+        len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+        if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 0))
+        {
+            /* a tag number of 2 is not extended so only one octet */
+            len++;
+            /* fileStartPosition */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+                return -1;
+            len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+            /* fileData */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING)
+                return -1;
+            blockCount = 1;
+            blocks = new byte[1][];
+            blocks[0] = new byte[lenValueType];
+            counts = new[] { (int)lenValueType };
+            len += ASN1.decode_octet_string(buffer, offset + len, apduLen, blocks[0], 0, lenValueType);
+            if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 0))
+                return -1;
+            /* a tag number is not extended so only one octet */
+            len++;
+        }
+        else if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 1))
+        {
+            isStream = false;
+            /* a tag number is not extended so only one octet */
+            len++;
+            /* fileStartRecord */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+                return -1;
+            len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+            /* returnedRecordCount */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+                return -1;
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out blockCount);
+            /* fileData */
+            blocks = new byte[blockCount][];
+            counts = new int[blockCount];
+            for (var i = 0; i < blockCount; i++)
+            {
+                tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                len += tagLen;
+                blocks[i] = new byte[lenValueType];
+                counts[i] = (int)lenValueType;
+                if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING)
+                    return -1;
+                len += ASN1.decode_octet_string(buffer, offset + len, apduLen, blocks[i], 0, lenValueType);
+            }
+            if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 1))
+                return -1;
+            /* a tag number is not extended so only one octet */
+            len++;
+        }
+        else
+            return -1;
+
+        return len;
+    }
+
+    // by Christopher Günter
+    public static void EncodeCreateProperty(EncodeBuffer buffer, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList)
+    {
+        /* Tag 1: sequence of WriteAccessSpecification */
+        ASN1.encode_opening_tag(buffer, 0);
+        ASN1.encode_context_object_id(buffer, 1, objectId.type, objectId.instance);
+        ASN1.encode_closing_tag(buffer, 0);
+
+        if (valueList == null)
+            return;
+
+        ASN1.encode_opening_tag(buffer, 1);
+
+        foreach (var pValue in valueList)
+        {
+            ASN1.encode_context_enumerated(buffer, 0, pValue.property.propertyIdentifier);
+
+            if (pValue.property.propertyArrayIndex != ASN1.BACNET_ARRAY_ALL)
+                ASN1.encode_context_unsigned(buffer, 1, pValue.property.propertyArrayIndex);
+
+            ASN1.encode_opening_tag(buffer, 2);
+            foreach (var value in pValue.value)
+            {
+                ASN1.bacapp_encode_application_data(buffer, value);
+            }
+            ASN1.encode_closing_tag(buffer, 2);
+
+            if (pValue.priority != ASN1.BACNET_NO_PRIORITY)
+                ASN1.encode_context_unsigned(buffer, 3, pValue.priority);
+        }
+
+        ASN1.encode_closing_tag(buffer, 1);
+    }
+
+    public static void EncodeAddListElement(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex, IList<BacnetValue> valueList)
+    {
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, propertyId);
+
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+
+        ASN1.encode_opening_tag(buffer, 3);
+        foreach (var value in valueList)
+        {
+            ASN1.bacapp_encode_application_data(buffer, value);
+        }
+
+        ASN1.encode_closing_tag(buffer, 3);
+    }
+
+    public static void EncodeAtomicWriteFileAcknowledge(EncodeBuffer buffer, bool isStream, int position)
+    {
+        ASN1.encode_context_signed(buffer, (byte)(isStream ? 0 : 1), position);
+    }
+
+    public static void EncodeCOVNotifyConfirmed(EncodeBuffer buffer, uint subscriberProcessIdentifier, uint initiatingDeviceIdentifier, BacnetObjectId monitoredObjectIdentifier, uint timeRemaining, IEnumerable<BacnetPropertyValue> values)
+    {
+        /* tag 0 - subscriberProcessIdentifier */
+        ASN1.encode_context_unsigned(buffer, 0, subscriberProcessIdentifier);
+        /* tag 1 - initiatingDeviceIdentifier */
+        ASN1.encode_context_object_id(buffer, 1, BacnetObjectTypes.OBJECT_DEVICE, initiatingDeviceIdentifier);
+        /* tag 2 - monitoredObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 2, monitoredObjectIdentifier.type, monitoredObjectIdentifier.instance);
+        /* tag 3 - timeRemaining */
+        ASN1.encode_context_unsigned(buffer, 3, timeRemaining);
+        /* tag 4 - listOfValues */
+        ASN1.encode_opening_tag(buffer, 4);
+        foreach (var value in values)
+        {
+            /* tag 0 - propertyIdentifier */
+            ASN1.encode_context_enumerated(buffer, 0, value.property.propertyIdentifier);
+            /* tag 1 - propertyArrayIndex OPTIONAL */
+            if (value.property.propertyArrayIndex != ASN1.BACNET_ARRAY_ALL)
+            {
+                ASN1.encode_context_unsigned(buffer, 1, value.property.propertyArrayIndex);
+            }
+            /* tag 2 - value */
+            /* abstract syntax gets enclosed in a context tag */
+            ASN1.encode_opening_tag(buffer, 2);
+            foreach (var v in value.value)
+            {
+                ASN1.bacapp_encode_application_data(buffer, v);
+            }
+            ASN1.encode_closing_tag(buffer, 2);
+            /* tag 3 - priority OPTIONAL */
+            if (value.priority != ASN1.BACNET_NO_PRIORITY)
+            {
+                ASN1.encode_context_unsigned(buffer, 3, value.priority);
+            }
+            /* is there another one to encode? */
+            /* FIXME: check to see if there is room in the APDU */
+        }
+        ASN1.encode_closing_tag(buffer, 4);
+    }
+
+    public static void EncodeCOVNotifyUnconfirmed(EncodeBuffer buffer, uint subscriberProcessIdentifier, uint initiatingDeviceIdentifier, BacnetObjectId monitoredObjectIdentifier, uint timeRemaining, IEnumerable<BacnetPropertyValue> values)
+    {
+        /* tag 0 - subscriberProcessIdentifier */
+        ASN1.encode_context_unsigned(buffer, 0, subscriberProcessIdentifier);
+        /* tag 1 - initiatingDeviceIdentifier */
+        ASN1.encode_context_object_id(buffer, 1, BacnetObjectTypes.OBJECT_DEVICE, initiatingDeviceIdentifier);
+        /* tag 2 - monitoredObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 2, monitoredObjectIdentifier.type, monitoredObjectIdentifier.instance);
+        /* tag 3 - timeRemaining */
+        ASN1.encode_context_unsigned(buffer, 3, timeRemaining);
+        /* tag 4 - listOfValues */
+        ASN1.encode_opening_tag(buffer, 4);
+        foreach (var value in values)
+        {
+            /* tag 0 - propertyIdentifier */
+            ASN1.encode_context_enumerated(buffer, 0, value.property.propertyIdentifier);
+            /* tag 1 - propertyArrayIndex OPTIONAL */
+            if (value.property.propertyArrayIndex != ASN1.BACNET_ARRAY_ALL)
+            {
+                ASN1.encode_context_unsigned(buffer, 1, value.property.propertyArrayIndex);
+            }
+            /* tag 2 - value */
+            /* abstract syntax gets enclosed in a context tag */
+            ASN1.encode_opening_tag(buffer, 2);
+            foreach (var v in value.value)
+            {
+                ASN1.bacapp_encode_application_data(buffer, v);
+            }
+            ASN1.encode_closing_tag(buffer, 2);
+            /* tag 3 - priority OPTIONAL */
+            if (value.priority != ASN1.BACNET_NO_PRIORITY)
+            {
+                ASN1.encode_context_unsigned(buffer, 3, value.priority);
+            }
+            /* is there another one to encode? */
+            /* FIXME: check to see if there is room in the APDU */
+        }
+        ASN1.encode_closing_tag(buffer, 4);
+    }
+
+    public static void EncodeSubscribeCOV(EncodeBuffer buffer, uint subscriberProcessIdentifier, BacnetObjectId monitoredObjectIdentifier, bool cancellationRequest, bool issueConfirmedNotifications, uint lifetime)
+    {
+        /* tag 0 - subscriberProcessIdentifier */
+        ASN1.encode_context_unsigned(buffer, 0, subscriberProcessIdentifier);
+        /* tag 1 - monitoredObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 1, monitoredObjectIdentifier.type, monitoredObjectIdentifier.instance);
+        /*
+           If both the 'Issue Confirmed Notifications' and
+           'Lifetime' parameters are absent, then this shall
+           indicate a cancellation request.
+         */
+        if (cancellationRequest)
+            return;
+        /* tag 2 - issueConfirmedNotifications */
+        ASN1.encode_context_boolean(buffer, 2, issueConfirmedNotifications);
+        /* tag 3 - lifetime */
+        ASN1.encode_context_unsigned(buffer, 3, lifetime);
+    }
+
+    public static int DecodeSubscribeCOV(byte[] buffer, int offset, int apduLen, out uint subscriberProcessIdentifier, out BacnetObjectId monitoredObjectIdentifier, out bool cancellationRequest, out bool issueConfirmedNotifications, out uint lifetime)
+    {
+        var len = 0;
+        uint lenValue;
+
+        subscriberProcessIdentifier = 0;
+        monitoredObjectIdentifier = new BacnetObjectId();
+        cancellationRequest = false;
+        issueConfirmedNotifications = false;
+        lifetime = 0;
+
+        /* tag 0 - subscriberProcessIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out subscriberProcessIdentifier);
+        }
+        else
+            return -1;
+        /* tag 1 - monitoredObjectIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out monitoredObjectIdentifier.type, out monitoredObjectIdentifier.instance);
+        }
+        else
+            return -1;
+        /* optional parameters - if missing, means cancellation */
+        if (len < apduLen)
+        {
+            /* tag 2 - issueConfirmedNotifications - optional */
+            if (ASN1.decode_is_context_tag(buffer, offset + len, 2))
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                issueConfirmedNotifications = buffer[offset + len] > 0;
+                len += (int)lenValue;
+            }
+            else
+            {
+                cancellationRequest = true;
+            }
+            /* tag 3 - lifetime - optional */
+            if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out lifetime);
+            }
+            else
+            {
+                lifetime = 0;
+            }
+        }
+        else
+        {
+            cancellationRequest = true;
+        }
+
+        return len;
+    }
+
+    public static void EncodeSubscribeProperty(EncodeBuffer buffer, uint subscriberProcessIdentifier, BacnetObjectId monitoredObjectIdentifier, bool cancellationRequest, bool issueConfirmedNotifications, uint lifetime, BacnetPropertyReference monitoredProperty, bool covIncrementPresent, float covIncrement)
+    {
+        /* tag 0 - subscriberProcessIdentifier */
+        ASN1.encode_context_unsigned(buffer, 0, subscriberProcessIdentifier);
+        /* tag 1 - monitoredObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 1, monitoredObjectIdentifier.type, monitoredObjectIdentifier.instance);
+        if (!cancellationRequest)
+        {
+            /* tag 2 - issueConfirmedNotifications */
+            ASN1.encode_context_boolean(buffer, 2, issueConfirmedNotifications);
+            /* tag 3 - lifetime */
+            ASN1.encode_context_unsigned(buffer, 3, lifetime);
+        }
+        /* tag 4 - monitoredPropertyIdentifier */
+        ASN1.encode_opening_tag(buffer, 4);
+        ASN1.encode_context_enumerated(buffer, 0, monitoredProperty.propertyIdentifier);
+        if (monitoredProperty.propertyArrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 1, monitoredProperty.propertyArrayIndex);
+        }
+        ASN1.encode_closing_tag(buffer, 4);
+
+        /* tag 5 - covIncrement */
+        if (covIncrementPresent)
+            ASN1.encode_context_real(buffer, 5, covIncrement);
+    }
+
+    public static int DecodeSubscribeProperty(byte[] buffer, int offset, int apduLen, out uint subscriberProcessIdentifier, out BacnetObjectId monitoredObjectIdentifier, out BacnetPropertyReference monitoredProperty, out bool cancellationRequest, out bool issueConfirmedNotifications, out uint lifetime, out float covIncrement)
+    {
+        var len = 0;
+        uint lenValue;
+        uint decodedValue;
+
+        subscriberProcessIdentifier = 0;
+        monitoredObjectIdentifier = new BacnetObjectId();
+        cancellationRequest = false;
+        issueConfirmedNotifications = false;
+        lifetime = 0;
+        covIncrement = 0;
+        monitoredProperty = new BacnetPropertyReference();
+
+        /* tag 0 - subscriberProcessIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out subscriberProcessIdentifier);
+        }
+        else
+            return -1;
+
+        /* tag 1 - monitoredObjectIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out monitoredObjectIdentifier.type, out monitoredObjectIdentifier.instance);
+        }
+        else
+            return -1;
+
+        /* tag 2 - issueConfirmedNotifications - optional */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 2))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            issueConfirmedNotifications = buffer[offset + len] > 0;
+            len++;
+        }
+        else
+        {
+            cancellationRequest = true;
+        }
+
+        /* tag 3 - lifetime - optional */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out lifetime);
+        }
+        else
+        {
+            lifetime = 0;
+        }
+
+        /* tag 4 - monitoredPropertyIdentifier */
+        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 4))
+            return -1;
+
+        /* a tag number of 4 is not extended so only one octet */
+        len++;
+        /* the propertyIdentifier is tag 0 */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out decodedValue);
+            monitoredProperty.propertyIdentifier = decodedValue;
+        }
+        else
+            return -1;
+
+        /* the optional array index is tag 1 */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out decodedValue);
+            monitoredProperty.propertyArrayIndex = decodedValue;
+        }
+        else
+        {
+            monitoredProperty.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+        }
+
+        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 4))
+            return -1;
+
+        /* a tag number of 4 is not extended so only one octet */
+        len++;
+        /* tag 5 - covIncrement - optional */
+        if (len < apduLen && ASN1.decode_is_context_tag(buffer, offset + len, 5))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_real(buffer, offset + len, out covIncrement);
+        }
+        else
+        {
+            covIncrement = 0;
+        }
+
+        return len;
+    }
+
+    // F Chaxel
+    public static int DecodeEventNotifyData(byte[] buffer, int offset, int apduLen, out BacnetEventNotificationData eventData)
+    {
+        var len = 0;
+        uint lenValue;
+
+        eventData = new BacnetEventNotificationData();
+
+        /* tag 0 - processIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out eventData.processIdentifier);
+        }
+        else
+            return -1;
+
+        /*  tag 1 - initiatingObjectIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out eventData.initiatingObjectIdentifier.type,
+                out eventData.initiatingObjectIdentifier.instance);
+        }
+        else
+            return -1;
+
+        /*  tag 2 - eventObjectIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 2))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out eventData.eventObjectIdentifier.type,
+                out eventData.eventObjectIdentifier.instance);
+        }
+        else
+            return -1;
+
+        /*  tag 3 - timeStamp */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+        {
+            len += 2; // opening Tag 3 then 2
+            len += ASN1.decode_application_date(buffer, offset + len, out var date);
+            len += ASN1.decode_application_time(buffer, offset + len, out var time);
+            eventData.timeStamp.Time = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute,
+                time.Second, time.Millisecond);
+
+            len += 2; // closing tag 2 then 3
+        }
+        else
+            return -1;
+
+        /* tag 4 - noticicationClass */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 4))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out eventData.notificationClass);
+        }
+        else
+            return -1;
+
+        /* tag 5 - priority */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 5))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out var priority);
+            if (priority > 0xFF) return -1;
+            eventData.priority = (byte)priority;
+        }
+        else
+            return -1;
+
+        /* tag 6 - eventType */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 6))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.eventType);
+        }
+        else
+            return -1;
+
+        /* optional tag 7 - messageText  : never tested */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 7))
+        {
+            // max_lenght 20000 sound like a joke
+            len += ASN1.decode_context_character_string(buffer, offset + len, 20000, 7, out eventData.messageText);
+        }
+
+        /* tag 8 - notifyType */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 8))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.notifyType);
+        }
+        else
+            return -1;
+
+        switch (eventData.notifyType)
+        {
+            case BacnetNotifyTypes.NOTIFY_ALARM:
+            case BacnetNotifyTypes.NOTIFY_EVENT:
+                /* tag 9 - ackRequired */
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_unsigned8(buffer, offset + len, out var val);
+                eventData.ackRequired = Convert.ToBoolean(val);
+
+                /* tag 10 - fromState */
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.fromState);
+                break;
+        }
+
+        /* tag 11 - toState */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 11))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.toState);
+        }
+        else
+            return -1;
+
+        /* tag 12 - event values */
+        switch (eventData.notifyType)
+        {
+            // In cases other than alarm and event there's no data,
+            // so do not return an error but break and continue normally
+            case BacnetNotifyTypes.NOTIFY_ACK_NOTIFICATION:
+                break;
+
+            case BacnetNotifyTypes.NOTIFY_ALARM:
+            case BacnetNotifyTypes.NOTIFY_EVENT:
+                if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 12))
+                    return -1;
+
+                len++;
+                if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, (byte)eventData.eventType))
+                    return -1;
+
+                len++;
+                switch (eventData.eventType)
+                {
+                    case BacnetEventTypes.EVENT_CHANGE_OF_BITSTRING:
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 0, out eventData.changeOfBitstring_referencedBitString);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.changeOfBitstring_statusFlags);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_STATE:
+                        len += ASN1.decode_context_property_state(buffer, offset + len, 0, out eventData.changeOfState_newState);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.changeOfState_statusFlags);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_VALUE:
+                        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 0))
+                            return -1;
+
+                        len++;
+                        if (ASN1.decode_is_context_tag(buffer, offset + len, (byte)BacnetCOVTypes.CHANGE_OF_VALUE_BITS))
+                        {
+                            len += ASN1.decode_context_bitstring(buffer, offset + len, 0, out eventData.changeOfValue_changedBits);
+                            eventData.changeOfValue_tag = BacnetCOVTypes.CHANGE_OF_VALUE_BITS;
+                        }
+                        else if (ASN1.decode_is_context_tag(buffer, offset + len, (byte)BacnetCOVTypes.CHANGE_OF_VALUE_REAL))
+                        {
+                            len += ASN1.decode_context_real(buffer, offset + len, 1, out eventData.changeOfValue_changeValue);
+                            eventData.changeOfValue_tag = BacnetCOVTypes.CHANGE_OF_VALUE_REAL;
+                        }
+                        else
+                        {
+                            return -1;
+                        }
+
+                        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 0))
+                            return -1;
+
+                        len++;
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 0, out eventData.changeOfValue_statusFlags);
+                        break;
+
+                    case BacnetEventTypes.EVENT_COMMAND_FAILURE:
+                        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 0))
+                            return -1;
+
+                        len++;
+                        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                        len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.commandFailure_commandValue);
+
+                        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 0))
+                            return -1;
+
+                        len++;
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.commandFailure_statusFlags);
+
+                        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 2))
+                            return -1;
+                        
+                        len++;
+                        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                        len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out eventData.commandFailure_feedbackValue);
+
+                        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 2))
+                            return -1;
+
+                        len++;
+                        break;
+
+                    case BacnetEventTypes.EVENT_FLOATING_LIMIT:
+                        len += ASN1.decode_context_real(buffer, offset + len, 0, out eventData.floatingLimit_referenceValue);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.floatingLimit_statusFlags);
+                        len += ASN1.decode_context_real(buffer, offset + len, 2, out eventData.floatingLimit_setPointValue);
+                        len += ASN1.decode_context_real(buffer, offset + len, 3, out eventData.floatingLimit_errorLimit);
+                        break;
+
+                    case BacnetEventTypes.EVENT_OUT_OF_RANGE:
+                        len += ASN1.decode_context_real(buffer, offset + len, 0, out eventData.outOfRange_exceedingValue);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.outOfRange_statusFlags);
+                        len += ASN1.decode_context_real(buffer, offset + len, 2, out eventData.outOfRange_deadband);
+                        len += ASN1.decode_context_real(buffer, offset + len, 3, out eventData.outOfRange_exceededLimit);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_LIFE_SAFETY:
+                        len += ASN1.decode_context_enumerated(buffer, offset + len, 0, out eventData.changeOfLifeSafety_newState);
+                        len += ASN1.decode_context_enumerated(buffer, offset + len, 1, out eventData.changeOfLifeSafety_newMode);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 2, out eventData.changeOfLifeSafety_statusFlags);
+                        len += ASN1.decode_context_enumerated(buffer, offset + len, 3, out eventData.changeOfLifeSafety_operationExpected);
+                        break;
+
+                    case BacnetEventTypes.EVENT_BUFFER_READY:
+                        // Too lazy for this one and not sure if really needed, somebody want to do it ? :)
+                        break;
+
+                    case BacnetEventTypes.EVENT_UNSIGNED_RANGE:
+                        len += ASN1.decode_context_unsigned(buffer, offset + len, 0, out eventData.unsignedRange_exceedingValue);
+                        len += ASN1.decode_context_bitstring(buffer, offset + len, 1, out eventData.unsignedRange_statusFlags);
+                        len += ASN1.decode_context_unsigned(buffer, offset + len, 2, out eventData.unsignedRange_exceededLimit);
+                        break;
+
+                    case BacnetEventTypes.EVENT_EXTENDED:
+                        len += ASN1.decode_context_unsigned(buffer, offset + len, 0, out eventData.extended_vendorId);
+                        len += ASN1.decode_context_unsigned(buffer, offset + len, 1, out eventData.extended_eventType);
+                        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 2))
+                            return -1;
+
+                        len++;
+                        eventData.extended_parameters = new object[0];
+
+                        while (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 2))
+                        {
+                            var paramCount = eventData.extended_parameters.Length + 1;
+                            Array.Resize(ref eventData.extended_parameters, paramCount);
+
+                            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out lenValue);
+
+                            switch ((BacnetApplicationTags)tagNumber)
+                            {
+                                case BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED:
+                                    len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out var enumeratedValue);
+                                    eventData.extended_parameters[paramCount - 1] = enumeratedValue;
+                                    break;
+
+                                case BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING:
+                                    len += ASN1.decode_bitstring(buffer, offset + len, lenValue, out var bitStringValue);
+                                    eventData.extended_parameters[paramCount - 1] = bitStringValue;
+                                    break;
+
+                                case BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT:
+                                    len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out var unsignedValue);
+                                    eventData.extended_parameters[paramCount - 1] = unsignedValue;
+                                    break;
+
+                                default:
+                                    var octetStringValue = new byte[lenValue];
+                                    len += ASN1.decode_octet_string(buffer, offset + len, apduLen, octetStringValue, 0, lenValue);
+                                    eventData.extended_parameters[paramCount - 1] = octetStringValue;
+                                    break;
+                            }
+                        }
+
+                        len++;
+                        break;
+
+                    default:
+                        return -1;
+                }
+
+                if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, (byte)eventData.eventType))
+                    return -1;
+
+                len++;
+                if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 12))
+                    return -1;
+
+                len++;
+                break;
+        }
+
+        return len;
+    }
+
+    private static void EncodeEventNotifyData(EncodeBuffer buffer, BacnetEventNotificationData data)
+    {
+        /* tag 0 - processIdentifier */
+        ASN1.encode_context_unsigned(buffer, 0, data.processIdentifier);
+        /* tag 1 - initiatingObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 1, data.initiatingObjectIdentifier.type, data.initiatingObjectIdentifier.instance);
+
+        /* tag 2 - eventObjectIdentifier */
+        ASN1.encode_context_object_id(buffer, 2, data.eventObjectIdentifier.type, data.eventObjectIdentifier.instance);
+
+        /* tag 3 - timeStamp */
+        ASN1.bacapp_encode_context_timestamp(buffer, 3, data.timeStamp);
+
+        /* tag 4 - noticicationClass */
+        ASN1.encode_context_unsigned(buffer, 4, data.notificationClass);
+
+        /* tag 5 - priority */
+        ASN1.encode_context_unsigned(buffer, 5, data.priority);
+
+        /* tag 6 - eventType */
+        ASN1.encode_context_enumerated(buffer, 6, (uint)data.eventType);
+
+        /* tag 7 - messageText */
+        if (!string.IsNullOrEmpty(data.messageText))
+            ASN1.encode_context_character_string(buffer, 7, data.messageText);
+
+        /* tag 8 - notifyType */
+        ASN1.encode_context_enumerated(buffer, 8, (uint)data.notifyType);
+
+        switch (data.notifyType)
+        {
+            case BacnetNotifyTypes.NOTIFY_ALARM:
+            case BacnetNotifyTypes.NOTIFY_EVENT:
+                /* tag 9 - ackRequired */
+                ASN1.encode_context_boolean(buffer, 9, data.ackRequired);
+
+                /* tag 10 - fromState */
+                ASN1.encode_context_enumerated(buffer, 10, (uint)data.fromState);
+                break;
+        }
+
+        /* tag 11 - toState */
+        ASN1.encode_context_enumerated(buffer, 11, (uint)data.toState);
+
+        switch (data.notifyType)
+        {
+            case BacnetNotifyTypes.NOTIFY_ALARM:
+            case BacnetNotifyTypes.NOTIFY_EVENT:
+                /* tag 12 - event values */
+                ASN1.encode_opening_tag(buffer, 12);
+
+                switch (data.eventType)
+                {
+                    case BacnetEventTypes.EVENT_CHANGE_OF_BITSTRING:
+                        ASN1.encode_opening_tag(buffer, 0);
+                        ASN1.encode_context_bitstring(buffer, 0, data.changeOfBitstring_referencedBitString);
+                        ASN1.encode_context_bitstring(buffer, 1, data.changeOfBitstring_statusFlags);
+                        ASN1.encode_closing_tag(buffer, 0);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_STATE:
+                        ASN1.encode_opening_tag(buffer, 1);
+                        ASN1.encode_opening_tag(buffer, 0);
+                        ASN1.bacapp_encode_property_state(buffer, data.changeOfState_newState);
+                        ASN1.encode_closing_tag(buffer, 0);
+                        ASN1.encode_context_bitstring(buffer, 1, data.changeOfState_statusFlags);
+                        ASN1.encode_closing_tag(buffer, 1);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_VALUE:
+                        ASN1.encode_opening_tag(buffer, 2);
+                        ASN1.encode_opening_tag(buffer, 0);
+
+                        switch (data.changeOfValue_tag)
+                        {
+                            case BacnetCOVTypes.CHANGE_OF_VALUE_REAL:
+                                ASN1.encode_context_real(buffer, 1, data.changeOfValue_changeValue);
+                                break;
+
+                            case BacnetCOVTypes.CHANGE_OF_VALUE_BITS:
+                                ASN1.encode_context_bitstring(buffer, 0, data.changeOfValue_changedBits);
+                                break;
+
+                            default:
+                                throw new Exception("Hmm?");
+                        }
+
+                        ASN1.encode_closing_tag(buffer, 0);
+                        ASN1.encode_context_bitstring(buffer, 1, data.changeOfValue_statusFlags);
+                        ASN1.encode_closing_tag(buffer, 2);
+                        break;
+
+                    case BacnetEventTypes.EVENT_FLOATING_LIMIT:
+                        ASN1.encode_opening_tag(buffer, 4);
+                        ASN1.encode_context_real(buffer, 0, data.floatingLimit_referenceValue);
+                        ASN1.encode_context_bitstring(buffer, 1, data.floatingLimit_statusFlags);
+                        ASN1.encode_context_real(buffer, 2, data.floatingLimit_setPointValue);
+                        ASN1.encode_context_real(buffer, 3, data.floatingLimit_errorLimit);
+                        ASN1.encode_closing_tag(buffer, 4);
+                        break;
+
+                    case BacnetEventTypes.EVENT_OUT_OF_RANGE:
+                        ASN1.encode_opening_tag(buffer, 5);
+                        ASN1.encode_context_real(buffer, 0, data.outOfRange_exceedingValue);
+                        ASN1.encode_context_bitstring(buffer, 1, data.outOfRange_statusFlags);
+                        ASN1.encode_context_real(buffer, 2, data.outOfRange_deadband);
+                        ASN1.encode_context_real(buffer, 3, data.outOfRange_exceededLimit);
+                        ASN1.encode_closing_tag(buffer, 5);
+                        break;
+
+                    case BacnetEventTypes.EVENT_CHANGE_OF_LIFE_SAFETY:
+                        ASN1.encode_opening_tag(buffer, 8);
+                        ASN1.encode_context_enumerated(buffer, 0, (uint)data.changeOfLifeSafety_newState);
+                        ASN1.encode_context_enumerated(buffer, 1, (uint)data.changeOfLifeSafety_newMode);
+                        ASN1.encode_context_bitstring(buffer, 2, data.changeOfLifeSafety_statusFlags);
+                        ASN1.encode_context_enumerated(buffer, 3, (uint)data.changeOfLifeSafety_operationExpected);
+                        ASN1.encode_closing_tag(buffer, 8);
+                        break;
+
+                    case BacnetEventTypes.EVENT_BUFFER_READY:
+                        ASN1.encode_opening_tag(buffer, 10);
+                        ASN1.bacapp_encode_context_device_obj_property_ref(buffer, 0, data.bufferReady_bufferProperty);
+                        ASN1.encode_context_unsigned(buffer, 1, data.bufferReady_previousNotification);
+                        ASN1.encode_context_unsigned(buffer, 2, data.bufferReady_currentNotification);
+                        ASN1.encode_closing_tag(buffer, 10);
+
+                        break;
+
+                    case BacnetEventTypes.EVENT_UNSIGNED_RANGE:
+                        ASN1.encode_opening_tag(buffer, 11);
+                        ASN1.encode_context_unsigned(buffer, 0, data.unsignedRange_exceedingValue);
+                        ASN1.encode_context_bitstring(buffer, 1, data.unsignedRange_statusFlags);
+                        ASN1.encode_context_unsigned(buffer, 2, data.unsignedRange_exceededLimit);
+                        ASN1.encode_closing_tag(buffer, 11);
+                        break;
+
+                    default:
+                        throw new NotImplementedException();
+                }
+                ASN1.encode_closing_tag(buffer, 12);
+                break;
+
+            case BacnetNotifyTypes.NOTIFY_ACK_NOTIFICATION:
+                /* FIXME: handle this case */
+                break;
+        }
+    }
+
+    public static void EncodeEventNotifyConfirmed(EncodeBuffer buffer, BacnetEventNotificationData data)
+    {
+        EncodeEventNotifyData(buffer, data);
+    }
+
+    public static void EncodeEventNotifyUnconfirmed(EncodeBuffer buffer, BacnetEventNotificationData data)
+    {
+        EncodeEventNotifyData(buffer, data);
+    }
+
+    public static void EncodeAlarmSummary(EncodeBuffer buffer, BacnetObjectId objectIdentifier, uint alarmState, BacnetBitString acknowledgedTransitions)
+    {
+        /* tag 0 - Object Identifier */
+        ASN1.encode_application_object_id(buffer, objectIdentifier.type, objectIdentifier.instance);
+        /* tag 1 - Alarm State */
+        ASN1.encode_application_enumerated(buffer, alarmState);
+        /* tag 2 - Acknowledged Transitions */
+        ASN1.encode_application_bitstring(buffer, acknowledgedTransitions);
+    }
+
+    // FChaxel
+    public static int DecodeAlarmSummaryOrEvent(byte[] buffer, int offset, int apduLen, bool getEvent, ref IList<BacnetGetEventInformationData> alarms, out bool moreEvent)
+    {
+        var len = 0; ;
+
+        if (getEvent)
+            len++;  // peut être tag 0
+
+        while (apduLen - 3 - len > 0)
+        {
+            var value = new BacnetGetEventInformationData();
+
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out value.objectIdentifier.type, out value.objectIdentifier.instance);
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out value.eventState);
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            len += ASN1.decode_bitstring(buffer, offset + len, lenValue, out value.acknowledgedTransitions);
+
+            if (getEvent)
+            {
+                len++;  // opening Tag 3
+                value.eventTimeStamps = new BacnetGenericTime[3];
+
+                for (var i = 0; i < 3; i++)
+                {
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue); // opening tag
+
+                    if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL)
+                    {
+                        len += ASN1.decode_application_date(buffer, offset + len, out var date);
+                        len += ASN1.decode_application_time(buffer, offset + len, out var time);
+                        var timestamp = date.Date + time.TimeOfDay;
+                        value.eventTimeStamps[i] = new BacnetGenericTime(timestamp, BacnetTimestampTags.TIME_STAMP_DATETIME);
+                        len++; // closing tag
+                    }
+                    else
+                        len += (int)lenValue;
+                }
+
+                len++;  // closing Tag 3
+
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out value.notifyType);
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+                len += ASN1.decode_bitstring(buffer, offset + len, lenValue, out value.eventEnable);
+
+                len++; // opening tag 6;
+                value.eventPriorities = new uint[3];
+                for (var i = 0; i < 3; i++)
+                {
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+                    len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out value.eventPriorities[i]);
+                }
+                len++;  // closing Tag 6
+            }
+
+            alarms.Add(value);
+        }
+
+        if (getEvent)
+            moreEvent = buffer[apduLen - 1] == 1;
+        else
+            moreEvent = false;
+
+        return len;
+    }
+    // DAL
+    public static int DecodeAlarmSummaryOrEventRequest(byte[] buffer, int offset, int apduLen, bool getEvent, ref BacnetObjectId id)
+    {
+        var len = 0;
+        // object id may be there for get event info, but it is optional
+        if (getEvent && apduLen != 0)
+        {
+            len++; // past opening tag 0
+            len += ASN1.decode_object_id(buffer, offset + len, out id.type, out id.instance);
+        }
+        return len;
+    }
+
+    public static void EncodeGetEventInformation(EncodeBuffer buffer, bool sendLast, BacnetObjectId lastReceivedObjectIdentifier)
+    {
+        /* encode optional parameter */
+        if (sendLast)
+            ASN1.encode_context_object_id(buffer, 0, lastReceivedObjectIdentifier.type, lastReceivedObjectIdentifier.instance);
+    }
+
+    public static void EncodeGetEventInformationAcknowledge(EncodeBuffer buffer, BacnetGetEventInformationData[] events, bool moreEvents)
+    {
+        /* service ack follows */
+        /* Tag 0: listOfEventSummaries */
+        ASN1.encode_opening_tag(buffer, 0);
+        foreach (var eventData in events)
+        {
+            /* Tag 0: objectIdentifier */
+            ASN1.encode_context_object_id(buffer, 0, eventData.objectIdentifier.type, eventData.objectIdentifier.instance);
+            /* Tag 1: eventState */
+            ASN1.encode_context_enumerated(buffer, 1, (uint)eventData.eventState);
+            /* Tag 2: acknowledgedTransitions */
+            ASN1.encode_context_bitstring(buffer, 2, eventData.acknowledgedTransitions);
+            /* Tag 3: eventTimeStamps */
+            ASN1.encode_opening_tag(buffer, 3);
+            for (var i = 0; i < 3; i++)
+            {
+                ASN1.bacapp_encode_timestamp(buffer, eventData.eventTimeStamps[i]);
+            }
+            ASN1.encode_closing_tag(buffer, 3);
+            /* Tag 4: notifyType */
+            ASN1.encode_context_enumerated(buffer, 4, (uint)eventData.notifyType);
+            /* Tag 5: eventEnable */
+            ASN1.encode_context_bitstring(buffer, 5, eventData.eventEnable);
+            /* Tag 6: eventPriorities */
+            ASN1.encode_opening_tag(buffer, 6);
+            for (var i = 0; i < 3; i++)
+            {
+                ASN1.encode_application_unsigned(buffer, eventData.eventPriorities[i]);
+            }
+            ASN1.encode_closing_tag(buffer, 6);
+        }
+        ASN1.encode_closing_tag(buffer, 0);
+        ASN1.encode_context_boolean(buffer, 1, moreEvents);
+    }
+
+    public static void EncodeLifeSafetyOperation(EncodeBuffer buffer, uint processId, string requestingSrc, uint operation, BacnetObjectId targetObject)
+    {
+        /* tag 0 - requestingProcessId */
+        ASN1.encode_context_unsigned(buffer, 0, processId);
+        /* tag 1 - requestingSource */
+        ASN1.encode_context_character_string(buffer, 1, requestingSrc);
+        /* Operation */
+        ASN1.encode_context_enumerated(buffer, 2, operation);
+        /* Object ID */
+        ASN1.encode_context_object_id(buffer, 3, targetObject.type, targetObject.instance);
+    }
+
+    public static void EncodePrivateTransferConfirmed(EncodeBuffer buffer, uint vendorID, uint serviceNumber, byte[] data)
+    {
+        ASN1.encode_context_unsigned(buffer, 0, vendorID);
+        ASN1.encode_context_unsigned(buffer, 1, serviceNumber);
+        ASN1.encode_opening_tag(buffer, 2);
+        buffer.Add(data, data.Length);
+        ASN1.encode_closing_tag(buffer, 2);
+    }
+
+    public static void EncodePrivateTransferUnconfirmed(EncodeBuffer buffer, uint vendorID, uint serviceNumber, byte[] data)
+    {
+        ASN1.encode_context_unsigned(buffer, 0, vendorID);
+        ASN1.encode_context_unsigned(buffer, 1, serviceNumber);
+        ASN1.encode_opening_tag(buffer, 2);
+        buffer.Add(data, data.Length);
+        ASN1.encode_closing_tag(buffer, 2);
+    }
+
+    public static void EncodePrivateTransferAcknowledge(EncodeBuffer buffer, uint vendorID, uint serviceNumber, byte[] data)
+    {
+        ASN1.encode_context_unsigned(buffer, 0, vendorID);
+        ASN1.encode_context_unsigned(buffer, 1, serviceNumber);
+        ASN1.encode_opening_tag(buffer, 2);
+        buffer.Add(data, data.Length);
+        ASN1.encode_closing_tag(buffer, 2);
+    }
+
+    public static void EncodeDeviceCommunicationControl(EncodeBuffer buffer, uint timeDuration, uint enableDisable, string password)
+    {
+        /* optional timeDuration */
+        if (timeDuration > 0)
+            ASN1.encode_context_unsigned(buffer, 0, timeDuration);
+
+        /* enable disable */
+        ASN1.encode_context_enumerated(buffer, 1, enableDisable);
+
+        /* optional password */
+        if (!string.IsNullOrEmpty(password))
+        {
+            /* FIXME: must be at least 1 character, limited to 20 characters */
+            ASN1.encode_context_character_string(buffer, 2, password);
+        }
+    }
+
+    public static int DecodeDeviceCommunicationControl(byte[] buffer, int offset, int apduLen, out uint timeDuration, out uint enableDisable, out string password)
+    {
+        var len = 0;
+        uint lenValueType;
+
+        timeDuration = 0;
+        enableDisable = 0;
+        password = "";
+
+        /* Tag 0: timeDuration, in minutes --optional--
+         * But if not included, take it as indefinite,
+         * which we return as "very large" */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValueType);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out timeDuration);
+        }
+
+        /* Tag 1: enable_disable */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 1))
+            return -1;
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValueType);
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out enableDisable);
+
+        /* Tag 2: password --optional-- */
+        if (len < apduLen)
+        {
+            if (!ASN1.decode_is_context_tag(buffer, offset + len, 2))
+                return -1;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValueType);
+            len += ASN1.decode_character_string(buffer, offset + len, apduLen - (offset + len), lenValueType, out password);
+        }
+
+        return len;
+    }
+
+    public static void EncodeReinitializeDevice(EncodeBuffer buffer, BacnetReinitializedStates state, string password)
+    {
+        ASN1.encode_context_enumerated(buffer, 0, (uint)state);
+
+        /* optional password */
+        if (!string.IsNullOrEmpty(password))
+        {
+            /* FIXME: must be at least 1 character, limited to 20 characters */
+            ASN1.encode_context_character_string(buffer, 1, password);
+        }
+    }
+
+    public static int DecodeReinitializeDevice(byte[] buffer, int offset, int apduLen, out BacnetReinitializedStates state, out string password)
+    {
+        var len = 0;
+
+        state = BacnetReinitializedStates.BACNET_REINIT_IDLE;
+        password = "";
+
+        /* Tag 0: reinitializedStateOfDevice */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out var lenValueType);
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out state);
+        /* Tag 1: password - optional */
+        if (len < apduLen)
+        {
+            if (!ASN1.decode_is_context_tag(buffer, offset + len, 1))
+                return -1;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValueType);
+            len += ASN1.decode_character_string(buffer, offset + len, apduLen - (offset + len), lenValueType, out password);
+        }
+
+        return len;
+    }
+
+    public static void EncodeReadRange(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex, BacnetReadRangeRequestTypes requestType, uint position, DateTime time, int count)
+    {
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, propertyId);
+
+        /* optional array index */
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+
+        /* Build the appropriate (optional) range parameter based on the request type */
+        switch (requestType)
+        {
+            case BacnetReadRangeRequestTypes.RR_BY_POSITION:
+                ASN1.encode_opening_tag(buffer, 3);
+                ASN1.encode_application_unsigned(buffer, position);
+                ASN1.encode_application_signed(buffer, count);
+                ASN1.encode_closing_tag(buffer, 3);
+                break;
+
+            case BacnetReadRangeRequestTypes.RR_BY_SEQUENCE:
+                ASN1.encode_opening_tag(buffer, 6);
+                ASN1.encode_application_unsigned(buffer, position);
+                ASN1.encode_application_signed(buffer, count);
+                ASN1.encode_closing_tag(buffer, 6);
+                break;
+
+            case BacnetReadRangeRequestTypes.RR_BY_TIME:
+                ASN1.encode_opening_tag(buffer, 7);
+                ASN1.encode_application_date(buffer, time);
+                ASN1.encode_application_time(buffer, time);
+                ASN1.encode_application_signed(buffer, count);
+                ASN1.encode_closing_tag(buffer, 7);
+                break;
+
+            case BacnetReadRangeRequestTypes.RR_READ_ALL:  /* to attempt a read of the whole array or list, omit the range parameter */
+                break;
+        }
+    }
+
+    public static int DecodeReadRange(byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out BacnetPropertyReference property, out BacnetReadRangeRequestTypes requestType, out uint position, out DateTime time, out int count)
+    {
+        var len = 0;
+
+        objectId = new BacnetObjectId();
+        property = new BacnetPropertyReference();
+        requestType = BacnetReadRangeRequestTypes.RR_READ_ALL;
+        position = 0;
+        time = new DateTime(1, 1, 1);
+        count = -1;
+
+        /* Tag 0: Object ID          */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+        len++;
+        len += ASN1.decode_object_id(buffer, offset + len, out ushort type, out objectId.instance);
+        objectId.type = (BacnetObjectTypes)type;
+        /* Tag 1: Property ID */
+        len +=
+            ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return -1;
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out property.propertyIdentifier);
+
+        /* Tag 2: Optional Array Index */
+        if (len < apduLen && ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out property.propertyArrayIndex);
+        }
+        else
+            property.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+
+        /* optional request type */
+        if (len < apduLen)
+        {
+            len += ASN1.decode_tag_number(buffer, offset + len, out tagNumber);    //opening tag
+            switch (tagNumber)
+            {
+                case 3:
+                    requestType = BacnetReadRangeRequestTypes.RR_BY_POSITION;
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                    len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out position);
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                    len += ASN1.decode_signed(buffer, offset + len, lenValueType, out count);
+                    break;
+
+                case 6:
+                    requestType = BacnetReadRangeRequestTypes.RR_BY_SEQUENCE;
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                    len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out position);
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                    len += ASN1.decode_signed(buffer, offset + len, lenValueType, out count);
+                    break;
+
+                case 7:
+                    requestType = BacnetReadRangeRequestTypes.RR_BY_TIME;
+                    len += ASN1.decode_application_date(buffer, offset + len, out var date);
+                    len += ASN1.decode_application_time(buffer, offset + len, out time);
+                    time = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
+                    len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+                    len += ASN1.decode_signed(buffer, offset + len, lenValueType, out count);
+                    break;
+
+                default:
+                    return -1;  //don't know this type yet
+            }
+            len += ASN1.decode_tag_number(buffer, offset + len, out tagNumber);    //closing tag
+        }
+        return len;
+    }
+
+    public static void EncodeReadRangeAcknowledge(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex, BacnetBitString resultFlags, uint itemCount, byte[] applicationData, BacnetReadRangeRequestTypes requestType, uint firstSequence)
+    {
+        /* service ack follows */
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, propertyId);
+        /* context 2 array index is optional */
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+        /* Context 3 BACnet Result Flags */
+        ASN1.encode_context_bitstring(buffer, 3, resultFlags);
+        /* Context 4 Item Count */
+        ASN1.encode_context_unsigned(buffer, 4, itemCount);
+        /* Context 5 Property list - reading the standard it looks like an empty list still
+         * requires an opening and closing tag as the tagged parameter is not optional
+         */
+        ASN1.encode_opening_tag(buffer, 5);
+        if (itemCount != 0)
+        {
+            buffer.Add(applicationData, applicationData.Length);
+        }
+        ASN1.encode_closing_tag(buffer, 5);
+
+        if (itemCount != 0 && requestType != BacnetReadRangeRequestTypes.RR_BY_POSITION && requestType != BacnetReadRangeRequestTypes.RR_READ_ALL)
+        {
+            /* Context 6 Sequence number of first item */
+            ASN1.encode_context_unsigned(buffer, 6, firstSequence);
+        }
+    }
+
+    // FC
+    public static uint DecodeReadRangeAcknowledge(byte[] buffer, int offset, int apduLen, out byte[] rangeBuffer)
+    {
+        var len = 0;
+        rangeBuffer = null;
+
+        /* Tag 0: Object ID          */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            return 0;
+
+        len++;
+        len += ASN1.decode_object_id(buffer, offset + len, out ushort _, out _);
+
+        /* Tag 1: Property ID */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return 0;
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out _);
+
+        /* Tag 2: Optional Array Index or Tag 3:  BACnet Result Flags */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber == 2 && len < apduLen)
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out _);
+        else
+            /* Tag 3:  BACnet Result Flags */
+            len += ASN1.decode_bitstring(buffer, offset + len, 2, out _);
+
+        /* Tag 4 Item Count */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out var itemCount);
+
+        if (!ASN1.decode_is_opening_tag(buffer, offset + len))
+            return 0;
+        len += 1;
+
+        rangeBuffer = new byte[buffer.Length - offset - len - 1];
+
+        Array.Copy(buffer, offset + len, rangeBuffer, 0, rangeBuffer.Length);
+
+        return itemCount;
+    }
+
+    public static void EncodeReadProperty(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex = ASN1.BACNET_ARRAY_ALL)
+    {
+        if ((int)objectId.type <= ASN1.BACNET_MAX_OBJECT)
+        {
+            /* check bounds so that we could create malformed
+               messages for testing */
+            ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        }
+        if (propertyId <= (uint)BacnetPropertyIds.MAX_BACNET_PROPERTY_ID)
+        {
+            /* check bounds so that we could create malformed
+               messages for testing */
+            ASN1.encode_context_enumerated(buffer, 1, propertyId);
+        }
+        /* optional array index */
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+    }
+
+    public static int DecodeAtomicWriteFileAcknowledge(byte[] buffer, int offset, int apduLen, out bool isStream, out int position)
+    {
+        var len = 0;
+
+        isStream = false;
+        position = 0;
+
+        len = ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        switch (tagNumber)
+        {
+            case 0:
+                isStream = true;
+                len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+                break;
+
+            case 1:
+                len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+                break;
+
+            default:
+                return -1;
+        }
+
+        return len;
+    }
+
+    public static int DecodeAtomicReadFileAcknowledge(byte[] buffer, int offset, int apduLen, out bool endOfFile, out bool isStream, out int position, out uint count, out byte[] targetBuffer, out int targetOffset)
+    {
+        var len = 0;
+
+        endOfFile = false;
+        isStream = false;
+        position = -1;
+        count = 0;
+        targetBuffer = null;
+        targetOffset = -1;
+
+        len = ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN)
+            return -1;
+
+        endOfFile = lenValueType > 0;
+        if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 0))
+        {
+            isStream = true;
+            /* a tag number is not extended so only one octet */
+            len++;
+            /* fileStartPosition */
+            var tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+                return -1;
+            len += ASN1.decode_signed(buffer, offset + len, lenValueType, out position);
+            /* fileData */
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            len += tagLen;
+            if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING)
+                return -1;
+            //len += ASN1.decode_octet_string(buffer, offset + len, buffer.Length, target_buffer, target_offset, len_value_type);
+            targetBuffer = buffer;
+            targetOffset = offset + len;
+            count = lenValueType;
+            len += (int)count;
+            if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 0))
+                return -1;
+            /* a tag number is not extended so only one octet */
+            len++;
+        }
+        else if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 1))
+        {
+            throw new NotImplementedException("Non stream File transfers are not supported");
+            ///* a tag number is not extended so only one octet */
+            //len++;
+            ///* fileStartRecord */
+            //tag_len = ASN1.decode_tag_number_and_value(buffer, offset + len, out tag_number, out len_value_type);
+            //len += tag_len;
+            //if (tag_number != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT)
+            //    return -1;
+            //len += ASN1.decode_signed(buffer, offset + len, len_value_type, out position);
+            ///* returnedRecordCount */
+            //tag_len = ASN1.decode_tag_number_and_value(buffer, offset + len, out tag_number, out len_value_type);
+            //len += tag_len;
+            //if (tag_number != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT)
+            //    return -1;
+            //len += ASN1.decode_unsigned(buffer, offset + len, len_value_type, out count);
+            //for (i = 0; i < count; i++)
+            //{
+            //    /* fileData */
+            //    tag_len = ASN1.decode_tag_number_and_value(buffer, offset + len, out tag_number, out len_value_type);
+            //    len += tag_len;
+            //    if (tag_number != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING)
+            //        return -1;
+            //    len += ASN1.decode_octet_string(buffer, offset + len, buffer.Length, target_buffer, target_offset, len_value_type);
+            //}
+            //if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 1))
+            //    return -1;
+            ///* a tag number is not extended so only one octet */
+            //len++;
+        }
+        else
+            return -1;
+
+        return len;
+    }
+
+    public static int DecodeReadProperty(byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out BacnetPropertyReference property)
+    {
+        var len = 0;
+
+        objectId = new BacnetObjectId();
+        property = new BacnetPropertyReference();
+
+        // must have at least 2 tags , otherwise return reject code: Missing required parameter
+        if (apduLen < 7)
+            return -1;
+
+        /* Tag 0: Object ID */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            return -2;
+
+        len++;
+        len += ASN1.decode_object_id(buffer, offset + len, out ushort type, out objectId.instance);
+        objectId.type = (BacnetObjectTypes)type;
+
+        /* Tag 1: Property ID */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return -2;
+
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out property.propertyIdentifier);
+
+        /* Tag 2: Optional Array Index */
+        if (len < apduLen)
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            if (tagNumber == 2 && len < apduLen)
+            {
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out property.propertyArrayIndex);
+            }
+            else
+                return -2;
+        }
+        else
+            property.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+
+        if (len < apduLen)
+            /* If something left over now, we have an invalid request */
+            return -3;
+
+        return len;
+    }
+
+    public static void EncodeReadPropertyAcknowledge(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex, IEnumerable<BacnetValue> valueList)
+    {
+        /* service ack follows */
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, propertyId);
+        /* context 2 array index is optional */
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+
+        /* Value */
+        ASN1.encode_opening_tag(buffer, 3);
+        foreach (BacnetValue value in valueList)
+        {
+            ASN1.bacapp_encode_application_data(buffer, value);
+        }
+        ASN1.encode_closing_tag(buffer, 3);
+    }
+
+    public static int DecodeReadPropertyAcknowledge(BacnetAddress address, byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out BacnetPropertyReference property, out IList<BacnetValue> valueList)
+    {
+        objectId = new BacnetObjectId();
+        property = new BacnetPropertyReference();
+        valueList = new List<BacnetValue>();
+
+        /* FIXME: check apduLen against the len during decode   */
+        /* Tag 0: Object ID */
+        if (!ASN1.decode_is_context_tag(buffer, offset, 0))
+            return -1;
+        var len = 1;
+        len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+        /* Tag 1: Property ID */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return -1;
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out property.propertyIdentifier);
+        /* Tag 2: Optional Array Index */
+        var tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber == 2)
+        {
+            len += tagLen;
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out property.propertyArrayIndex);
+        }
+        else
+            property.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+
+        /* Tag 3: opening context tag */
+        if (ASN1.decode_is_opening_tag_number(buffer, offset + len, 3))
+        {
+            /* a tag number of 3 is not extended so only one octet */
+            len++;
+
+            while (apduLen - len > 1)
+            {
+                tagLen = ASN1.bacapp_decode_application_data(address, buffer, offset + len, apduLen + offset, objectId.type, (BacnetPropertyIds)property.propertyIdentifier, out var value);
+                if (tagLen < 0) return -1;
+                len += tagLen;
+                valueList.Add(value);
+            }
+        }
+        else
+            return -1;
+
+        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 3))
+            return -1;
+        len++;
+
+        return len;
+    }
+
+    public static void EncodeReadPropertyMultiple(EncodeBuffer buffer, IList<BacnetReadAccessSpecification> properties)
+    {
+        foreach (var value in properties)
+            ASN1.encode_read_access_specification(buffer, value);
+    }
+
+    public static void EncodeReadPropertyMultiple(EncodeBuffer buffer, BacnetObjectId objectId, IList<BacnetPropertyReference> properties)
+    {
+        EncodeReadPropertyMultiple(buffer, new[] { new BacnetReadAccessSpecification(objectId, properties) });
+    }
+
+    public static int DecodeReadPropertyMultiple(byte[] buffer, int offset, int apduLen, out IList<BacnetReadAccessSpecification> properties)
+    {
+        var len = 0;
+
+        var values = new List<BacnetReadAccessSpecification>();
+        properties = null;
+
+        while (apduLen - len > 0)
+        {
+            var tmp = ASN1.decode_read_access_specification(buffer, offset + len, apduLen - len, out var value);
+            if (tmp < 0) return -1;
+            len += tmp;
+            values.Add(value);
+        }
+
+        properties = values;
+        return len;
+    }
+
+    public static void EncodeReadPropertyMultipleAcknowledge(EncodeBuffer buffer, IList<BacnetReadAccessResult> values)
+    {
+        foreach (var value in values)
+            ASN1.encode_read_access_result(buffer, value);
+    }
+
+    public static int DecodeReadPropertyMultipleAcknowledge(BacnetAddress address, byte[] buffer, int offset, int apduLen, out IList<BacnetReadAccessResult> values)
+    {
+        var len = 0;
+
+        var result = new List<BacnetReadAccessResult>();
+
+        while (apduLen - len > 0)
+        {
+            var tmp = ASN1.decode_read_access_result(address, buffer, offset + len, apduLen - len, out var value);
+            if (tmp < 0)
+            {
+                values = null;
+                return -1;
+            }
+            len += tmp;
+            result.Add(value);
+        }
+
+        values = result;
+        return len;
+    }
+
+    public static void EncodeWriteProperty(EncodeBuffer buffer, BacnetObjectId objectId, uint propertyId, uint arrayIndex, uint priority, IEnumerable<BacnetValue> valueList)
+    {
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        ASN1.encode_context_enumerated(buffer, 1, propertyId);
+
+        /* optional array index; ALL is -1 which is assumed when missing */
+        if (arrayIndex != ASN1.BACNET_ARRAY_ALL)
+        {
+            ASN1.encode_context_unsigned(buffer, 2, arrayIndex);
+        }
+
+        /* propertyValue */
+        ASN1.encode_opening_tag(buffer, 3);
+        foreach (var value in valueList)
+        {
+            ASN1.bacapp_encode_application_data(buffer, value);
+        }
+        ASN1.encode_closing_tag(buffer, 3);
+
+        /* optional priority - 0 if not set, 1..16 if set */
+        if (priority != ASN1.BACNET_NO_PRIORITY)
+        {
+            ASN1.encode_context_unsigned(buffer, 4, priority);
+        }
+    }
+
+    public static int DecodeCOVNotifyUnconfirmed(BacnetAddress address, byte[] buffer, int offset, int apduLen, out uint subscriberProcessIdentifier, out BacnetObjectId initiatingDeviceIdentifier, out BacnetObjectId monitoredObjectIdentifier, out uint timeRemaining, out ICollection<BacnetPropertyValue> values)
+    {
+        var len = 0;
+        uint lenValue;
+
+        subscriberProcessIdentifier = 0;
+        initiatingDeviceIdentifier = new BacnetObjectId();
+        monitoredObjectIdentifier = new BacnetObjectId();
+        timeRemaining = 0;
+        values = null;
+
+        /* tag 0 - subscriberProcessIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out subscriberProcessIdentifier);
+        }
+        else
+            return -1;
+
+        /* tag 1 - initiatingDeviceIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out initiatingDeviceIdentifier.type, out initiatingDeviceIdentifier.instance);
+        }
+        else
+            return -1;
+
+        /* tag 2 - monitoredObjectIdentifier */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 2))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_object_id(buffer, offset + len, out monitoredObjectIdentifier.type, out monitoredObjectIdentifier.instance);
+        }
+        else
+            return -1;
+
+        /* tag 3 - timeRemaining */
+        if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out timeRemaining);
+        }
+        else
+            return -1;
+
+        /* tag 4: opening context tag - listOfValues */
+        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 4))
+            return -1;
+
+        /* a tag number of 4 is not extended so only one octet */
+        len++;
+        var _values = new LinkedList<BacnetPropertyValue>();
+        while (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 4))
+        {
+            var newEntry = new BacnetPropertyValue();
+
+            /* tag 0 - propertyIdentifier */
+            if (ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out newEntry.property.propertyIdentifier);
+            }
+            else
+                return -1;
+
+            /* tag 1 - propertyArrayIndex OPTIONAL */
+            if (ASN1.decode_is_context_tag(buffer, offset + len, 1))
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out newEntry.property.propertyArrayIndex);
+            }
+            else
+                newEntry.property.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+
+            /* tag 2: opening context tag - value */
+            if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 2))
+                return -1;
+
+            /* a tag number of 2 is not extended so only one octet */
+            len++;
+            var bValues = new List<BacnetValue>();
+            while (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 2))
+            {
+                var tmp = ASN1.bacapp_decode_application_data(address, buffer, offset + len, apduLen + offset, monitoredObjectIdentifier.type, (BacnetPropertyIds)newEntry.property.propertyIdentifier, out var bValue);
+                if (tmp < 0) return -1;
+                len += tmp;
+                bValues.Add(bValue);
+            }
+            newEntry.value = bValues;
+
+            /* a tag number of 2 is not extended so only one octet */
+            len++;
+            /* tag 3 - priority OPTIONAL */
+            if (ASN1.decode_is_context_tag(buffer, offset + len, 3))
+            {
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out _, out lenValue);
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out var decodedValue);
+                newEntry.priority = (byte)decodedValue;
+            }
+            else
+                newEntry.priority = (byte)ASN1.BACNET_NO_PRIORITY;
+
+            _values.AddLast(newEntry);
+        }
+
+        values = _values;
+        return len;
+    }
+
+    public static int DecodeWriteProperty(BacnetAddress address, byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out BacnetPropertyValue value)
+    {
+        var len = 0;
+
+        objectId = new BacnetObjectId();
+        value = new BacnetPropertyValue();
+
+        /* Tag 0: Object ID          */
+        if (!ASN1.decode_is_context_tag(buffer, offset + len, 0))
+            return -1;
+        len++;
+        len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+        /* Tag 1: Property ID */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValueType);
+        if (tagNumber != 1)
+            return -1;
+        len += ASN1.decode_enumerated(buffer, offset + len, lenValueType, out value.property.propertyIdentifier);
+        /* Tag 2: Optional Array Index */
+        /* note: decode without incrementing len so we can check for opening tag */
+        var tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+        if (tagNumber == 2)
+        {
+            len += tagLen;
+            len += ASN1.decode_unsigned(buffer, offset + len, lenValueType, out value.property.propertyArrayIndex);
+        }
+        else
+            value.property.propertyArrayIndex = ASN1.BACNET_ARRAY_ALL;
+        /* Tag 3: opening context tag */
+        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 3))
+            return -1;
+        len++;
+
+        //data
+        var valueList = new List<BacnetValue>();
+        while (apduLen - len > 1 && !ASN1.decode_is_closing_tag_number(buffer, offset + len, 3))
+        {
+            var l = ASN1.bacapp_decode_application_data(address, buffer, offset + len, apduLen + offset, objectId.type, (BacnetPropertyIds)value.property.propertyIdentifier, out var bValue);
+            if (l <= 0) return -1;
+            len += l;
+            valueList.Add(bValue);
+        }
+        value.value = valueList;
+
+        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 3))
+            return -2;
+        /* a tag number of 3 is not extended so only one octet */
+        len++;
+        /* Tag 4: optional Priority - assumed MAX if not explicitly set */
+        value.priority = (byte)ASN1.BACNET_MAX_PRIORITY;
+        if (len < apduLen)
+        {
+            tagLen = ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValueType);
+            if (tagNumber == 4)
+            {
+                len += tagLen;
+                len = ASN1.decode_unsigned(buffer, offset + len, lenValueType, out var unsignedValue);
+                if (unsignedValue >= ASN1.BACNET_MIN_PRIORITY && unsignedValue <= ASN1.BACNET_MAX_PRIORITY)
+                    value.priority = (byte)unsignedValue;
+                else
+                    return -1;
+            }
+        }
+
+        return len;
+    }
+
+    public static void EncodeWritePropertyMultiple(EncodeBuffer buffer, BacnetObjectId objectId, ICollection<BacnetPropertyValue> valueList)
+    {
+        ASN1.encode_context_object_id(buffer, 0, objectId.type, objectId.instance);
+        /* Tag 1: sequence of WriteAccessSpecification */
+        ASN1.encode_opening_tag(buffer, 1);
+
+        foreach (var pValue in valueList)
+        {
+            /* Tag 0: Property */
+            ASN1.encode_context_enumerated(buffer, 0, pValue.property.propertyIdentifier);
+
+            /* Tag 1: array index */
+            if (pValue.property.propertyArrayIndex != ASN1.BACNET_ARRAY_ALL)
+                ASN1.encode_context_unsigned(buffer, 1, pValue.property.propertyArrayIndex);
+
+            /* Tag 2: Value */
+            ASN1.encode_opening_tag(buffer, 2);
+            foreach (var value in pValue.value)
+            {
+                ASN1.bacapp_encode_application_data(buffer, value);
+            }
+            ASN1.encode_closing_tag(buffer, 2);
+
+            /* Tag 3: Priority */
+            if (pValue.priority != ASN1.BACNET_NO_PRIORITY)
+                ASN1.encode_context_unsigned(buffer, 3, pValue.priority);
+        }
+
+        ASN1.encode_closing_tag(buffer, 1);
+    }
+
+    public static void EncodeWriteObjectMultiple(EncodeBuffer buffer, ICollection<BacnetReadAccessResult> valueList)
+    {
+        foreach (var value in valueList)
+            EncodeWritePropertyMultiple(buffer, value.objectIdentifier, value.values);
+    }
+
+    // By C. Gunter
+    // quite the same as DecodeWritePropertyMultiple
+    public static int DecodeCreateObject(BacnetAddress address, byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out ICollection<BacnetPropertyValue> valuesRefs)
+    {
+        var len = 0;
+
+        objectId = new BacnetObjectId();
+        valuesRefs = null;
+
+        //object id
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue);
+
+        if (tagNumber == 0 && apduLen > len)
+        {
+            apduLen -= len;
+            if (apduLen >= 4)
+            {
+                len += ASN1.decode_context_object_id(buffer, offset + len, 1, out var typenr, out objectId.instance);
+                objectId.type = (BacnetObjectTypes)typenr;
+            }
+            else
+                return -1;
+        }
+        else
+            return -1;
+        if (ASN1.decode_is_closing_tag(buffer, offset + len))
+            len++;
+        //end objectid
+
+        // No initial values ?
+        if (buffer.Length == offset + len)
+            return len;
+
+        /* Tag 1: sequence of WriteAccessSpecification */
+        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        var _values = new LinkedList<BacnetPropertyValue>();
+        while (apduLen - len > 1)
+        {
+            var newEntry = new BacnetPropertyValue();
+
+            /* tag 0 - Property Identifier */
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            uint propertyId;
+            if (tagNumber == 0)
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out propertyId);
+            else
+                return -1;
+
+            /* tag 1 - Property Array Index - optional */
+            var ulVal = ASN1.BACNET_ARRAY_ALL;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            if (tagNumber == 1)
+            {
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out ulVal);
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            }
+            newEntry.property = new BacnetPropertyReference(propertyId, ulVal);
+
+            /* tag 2 - Property Value */
+            if (tagNumber == 2 && ASN1.decode_is_opening_tag(buffer, offset + len - 1))
+            {
+                var values = new List<BacnetValue>();
+                while (!ASN1.decode_is_closing_tag(buffer, offset + len))
+                {
+                    var l = ASN1.bacapp_decode_application_data(address, buffer, offset + len, apduLen + offset, objectId.type, (BacnetPropertyIds)propertyId, out var value);
+                    if (l <= 0) return -1;
+                    len += l;
+                    values.Add(value);
+                }
+                len++;
+                newEntry.value = values;
+            }
+            else
+                return -1;
+
+            _values.AddLast(newEntry);
+        }
+
+        /* Closing tag 1 - List of Properties */
+        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        valuesRefs = _values;
+
+        return len;
+    }
+
+    public static int DecodeDeleteObject(byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId)
+    {
+        objectId = new BacnetObjectId();
+        ASN1.decode_tag_number_and_value(buffer, offset, out var tagNumber, out _);
+
+        if (tagNumber != 12)
+            return -1;
+
+        var len = 1;
+        len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+
+        if (len == apduLen) //check if packet was correct!
+            return len;
+
+        return -1;
+    }
+
+    public static void EncodeCreateObjectAcknowledge(EncodeBuffer buffer, BacnetObjectId objectId)
+    {
+        ASN1.encode_application_object_id(buffer, objectId.type, objectId.instance);
+    }
+
+    public static int DecodeWritePropertyMultiple(BacnetAddress address, byte[] buffer, int offset, int apduLen, out BacnetObjectId objectId, out ICollection<BacnetPropertyValue> valuesRefs)
+    {
+        var len = 0;
+        objectId = new BacnetObjectId();
+        valuesRefs = null;
+
+        /* Context tag 0 - Object ID */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out var lenValue);
+        if (tagNumber == 0 && apduLen > len)
+        {
+            apduLen -= len;
+            if (apduLen >= 4)
+            {
+                len += ASN1.decode_object_id(buffer, offset + len, out objectId.type, out objectId.instance);
+            }
+            else
+                return -1;
+        }
+        else
+            return -1;
+
+        /* Tag 1: sequence of WriteAccessSpecification */
+        if (!ASN1.decode_is_opening_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        var _values = new LinkedList<BacnetPropertyValue>();
+        while (apduLen - len > 1)
+        {
+            var newEntry = new BacnetPropertyValue();
+
+            /* tag 0 - Property Identifier */
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            uint propertyId;
+            if (tagNumber == 0)
+                len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out propertyId);
+            else
+                return -1;
+
+            /* tag 1 - Property Array Index - optional */
+            var ulVal = ASN1.BACNET_ARRAY_ALL;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            if (tagNumber == 1)
+            {
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out ulVal);
+                len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            }
+            newEntry.property = new BacnetPropertyReference(propertyId, ulVal);
+
+            /* tag 2 - Property Value */
+            if (tagNumber == 2 && ASN1.decode_is_opening_tag(buffer, offset + len - 1))
+            {
+                var values = new List<BacnetValue>();
+                while (!ASN1.decode_is_closing_tag(buffer, offset + len))
+                {
+                    var l = ASN1.bacapp_decode_application_data(address, buffer, offset + len, apduLen + offset, objectId.type, (BacnetPropertyIds)propertyId, out var value);
+                    if (l <= 0) return -1;
+                    len += l;
+                    values.Add(value);
+                }
+                len++;
+                newEntry.value = values;
+            }
+            else
+                return -1;
+
+            /* tag 3 - Priority - optional */
+            ulVal = ASN1.BACNET_NO_PRIORITY;
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out lenValue);
+            if (tagNumber == 3)
+                len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out ulVal);
+            else
+                len--;
+            newEntry.priority = (byte)ulVal;
+
+            _values.AddLast(newEntry);
+        }
+
+        /* Closing tag 1 - List of Properties */
+        if (!ASN1.decode_is_closing_tag_number(buffer, offset + len, 1))
+            return -1;
+        len++;
+
+        valuesRefs = _values;
+
+        return len;
+    }
+
+    public static void EncodeTimeSync(EncodeBuffer buffer, DateTime time)
+    {
+        ASN1.encode_application_date(buffer, time);
+        ASN1.encode_application_time(buffer, time);
+    }
+
+    public static int DecodeTimeSync(byte[] buffer, int offset, int length, out DateTime dateTime)
+    {
+        var len = 0;
+        dateTime = new DateTime(1, 1, 1);
+
+        /* date */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var tagNumber, out _);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE)
+            return -1;
+        len += ASN1.decode_date(buffer, offset + len, out var date);
+        /* time */
+        len += ASN1.decode_tag_number_and_value(buffer, offset + len, out tagNumber, out _);
+        if (tagNumber != (byte)BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME)
+            return -1;
+        len += ASN1.decode_bacnet_time(buffer, offset + len, out var time);
+
+        //merge
+        dateTime = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
+
+        return len;
+    }
+
+    public static void EncodeError(EncodeBuffer buffer, BacnetErrorClasses errorClass, BacnetErrorCodes errorCode)
+    {
+        ASN1.encode_application_enumerated(buffer, (uint)errorClass);
+        ASN1.encode_application_enumerated(buffer, (uint)errorCode);
+    }
+
+    public static int DecodeError(byte[] buffer, int offset, int length, out BacnetErrorClasses errorClass, out BacnetErrorCodes errorCode)
+    {
+        var orgOffset = offset;
+
+        offset += ASN1.decode_tag_number_and_value(buffer, offset, out _, out var lenValueType);
+        /* FIXME: we could validate that the tag is enumerated... */
+        offset += ASN1.decode_enumerated(buffer, offset, lenValueType, out errorClass);
+        offset += ASN1.decode_tag_number_and_value(buffer, offset, out _, out lenValueType);
+        /* FIXME: we could validate that the tag is enumerated... */
+        offset += ASN1.decode_enumerated(buffer, offset, lenValueType, out errorCode);
+
+        return offset - orgOffset;
+    }
+
+    public static void EncodeLogRecord(EncodeBuffer buffer, BacnetLogRecord record)
+    {
+        /* Tag 0: timestamp */
+        ASN1.encode_opening_tag(buffer, 0);
+        ASN1.encode_application_date(buffer, record.timestamp);
+        ASN1.encode_application_time(buffer, record.timestamp);
+        ASN1.encode_closing_tag(buffer, 0);
+
+        /* Tag 1: logDatum */
+        if (record.type != BacnetTrendLogValueType.TL_TYPE_NULL)
+        {
+            if (record.type == BacnetTrendLogValueType.TL_TYPE_ERROR)
+            {
+                ASN1.encode_opening_tag(buffer, 1);
+                ASN1.encode_opening_tag(buffer, 8);
+                var err = record.GetValue<BacnetError>();
+                EncodeError(buffer, err.error_class, err.error_code);
+                ASN1.encode_closing_tag(buffer, 8);
+                ASN1.encode_closing_tag(buffer, 1);
+                return;
+            }
+
+            ASN1.encode_opening_tag(buffer, 1);
+            var tmp1 = new EncodeBuffer();
+            switch (record.type)
+            {
+                case BacnetTrendLogValueType.TL_TYPE_ANY:
+                    throw new NotImplementedException();
+                case BacnetTrendLogValueType.TL_TYPE_BITS:
+                    ASN1.encode_bitstring(tmp1, record.GetValue<BacnetBitString>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_BOOL:
+                    tmp1.Add(record.GetValue<bool>() ? (byte)1 : (byte)0);
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_DELTA:
+                    ASN1.encode_bacnet_real(tmp1, record.GetValue<float>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_ENUM:
+                    ASN1.encode_application_enumerated(tmp1, record.GetValue<uint>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_REAL:
+                    ASN1.encode_bacnet_real(tmp1, record.GetValue<float>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_SIGN:
+                    ASN1.encode_bacnet_signed(tmp1, record.GetValue<int>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_STATUS:
+                    ASN1.encode_bitstring(tmp1, record.GetValue<BacnetBitString>());
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_UNSIGN:
+                    ASN1.encode_bacnet_unsigned(tmp1, record.GetValue<uint>());
+                    break;
+            }
+            ASN1.encode_tag(buffer, (byte)record.type, true, (uint)tmp1.offset);
+            buffer.Add(tmp1.buffer, tmp1.offset);
+            ASN1.encode_closing_tag(buffer, 1);
+        }
+
+        /* Tag 2: status */
+        if (record.statusFlags.bits_used > 0)
+        {
+            ASN1.encode_opening_tag(buffer, 2);
+            ASN1.encode_application_bitstring(buffer, record.statusFlags);
+            ASN1.encode_closing_tag(buffer, 2);
+        }
+    }
+
+    public static int DecodeLogRecord(byte[] buffer, int offset, int length, int nCurves, out BacnetLogRecord[] records)
+    {
+        var len = 0;
+        records = new BacnetLogRecord[nCurves];
+
+        len += ASN1.decode_tag_number(buffer, offset + len, out var tagNumber);
+        if (tagNumber != 0) return -1;
+
+        // Date and Time in Tag 0
+        len += ASN1.decode_application_date(buffer, offset + len, out var date);
+        len += ASN1.decode_application_time(buffer, offset + len, out var time);
+
+        var dt = new DateTime(date.Year, date.Month, date.Day, time.Hour, time.Minute, time.Second, time.Millisecond);
+
+        if (!ASN1.decode_is_closing_tag(buffer, offset + len)) return -1;
+        len++;
+
+        // Value or error in Tag 1
+        len += ASN1.decode_tag_number(buffer, offset + len, out tagNumber);
+        if (tagNumber != 1) return -1;
+
+        // Not test for TrendLogMultiple
+        // Seems to be encoded like this somewhere in an Ashrae document
+        for (var curveNumber = 0; curveNumber < nCurves; curveNumber++)
+        {
+            len += ASN1.decode_tag_number_and_value(buffer, offset + len, out var contextTagType, out var lenValue);
+            records[curveNumber] = new BacnetLogRecord
+            {
+                timestamp = dt,
+                type = (BacnetTrendLogValueType)contextTagType
+            };
+
+            switch ((BacnetTrendLogValueType)contextTagType)
+            {
+                case BacnetTrendLogValueType.TL_TYPE_STATUS:
+                    len += ASN1.decode_bitstring(buffer, offset + len, lenValue, out var sval);
+                    records[curveNumber].Value = sval;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_BOOL:
+                    records[curveNumber].Value = buffer[offset + len] > 0;
+                    len++;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_REAL:
+                    len += ASN1.decode_real(buffer, offset + len, out var rval);
+                    records[curveNumber].Value = rval;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_ENUM:
+                    len += ASN1.decode_enumerated(buffer, offset + len, lenValue, out var eval);
+                    records[curveNumber].Value = eval;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_SIGN:
+                    len += ASN1.decode_signed(buffer, offset + len, lenValue, out var ival);
+                    records[curveNumber].Value = ival;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_UNSIGN:
+                    len += ASN1.decode_unsigned(buffer, offset + len, lenValue, out var uinval);
+                    records[curveNumber].Value = uinval;
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_ERROR:
+                    len += DecodeError(buffer, offset + len, length, out var errclass, out var errcode);
+                    records[curveNumber].Value = new BacnetError(errclass, errcode);
+                    len++; // Closing Tag 8
+                    break;
+
+                case BacnetTrendLogValueType.TL_TYPE_NULL:
+                    len++;
+                    records[curveNumber].Value = null;
+                    break;
+                // Time change (Automatic or Synch time) Delta in seconds
+                case BacnetTrendLogValueType.TL_TYPE_DELTA:
+                    len += ASN1.decode_real(buffer, offset + len, out var dval);
+                    records[curveNumber].Value = dval;
+                    break;
+                // No way to handle these data types, sure it's the end of this download !
+                case BacnetTrendLogValueType.TL_TYPE_ANY:
+                    throw new NotImplementedException();
+                case BacnetTrendLogValueType.TL_TYPE_BITS:
+                    len += ASN1.decode_bitstring(buffer, offset + len, lenValue, out var bval);
+                    records[curveNumber].Value = bval;
+                    break;
+
+                default:
+                    return 0;
+            }
+        }
+
+        if (!ASN1.decode_is_closing_tag(buffer, offset + len))
+            return -1;
+
+        len++;
+
+        if (len >= length)
+            return len;
+
+        var l = ASN1.decode_tag_number(buffer, offset + len, out tagNumber);
+
+        // Optional Tag 2
+        if (tagNumber != 2)
+            return len;
+
+        len += l;
+        len += ASN1.decode_bitstring(buffer, offset + len, 2, out var statusFlags);
+
+        //set status to all returns
+        for (var curveNumber = 0; curveNumber < nCurves; curveNumber++)
+            records[curveNumber].statusFlags = statusFlags;
+
+        return len;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/DeviceStorage.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/DeviceStorage.cs
new file mode 100644
index 0000000..8422d39
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/DeviceStorage.cs
@@ -0,0 +1,459 @@
+/**************************************************************************
+*                           MIT License
+* 
+* Copyright (C) 2014 Morten Kvistgaard <mk@pch-engineering.dk>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+namespace System.IO.BACnet.Storage;
+
+/// <summary>
+/// This is a basic example of a BACNet storage. This one is XML based. It has no fancy optimizing or anything.
+/// </summary>
+[Serializable]
+public class DeviceStorage
+{
+    [XmlIgnore]
+    public uint DeviceId { get; set; }
+
+    public delegate void ChangeOfValueHandler(DeviceStorage sender, BacnetObjectId objectId, BacnetPropertyIds propertyId, uint arrayIndex, IList<BacnetValue> value);
+    public event ChangeOfValueHandler ChangeOfValue;
+    public delegate void ReadOverrideHandler(BacnetObjectId objectId, BacnetPropertyIds propertyId, uint arrayIndex, out IList<BacnetValue> value, out ErrorCodes status, out bool handled);
+    public event ReadOverrideHandler ReadOverride;
+    public delegate void WriteOverrideHandler(BacnetObjectId objectId, BacnetPropertyIds propertyId, uint arrayIndex, IList<BacnetValue> value, out ErrorCodes status, out bool handled);
+    public event WriteOverrideHandler WriteOverride;
+
+    public Object[] Objects { get; set; }
+
+    public DeviceStorage()
+    {
+        DeviceId = (uint)new Random().Next();
+        Objects = new Object[0];
+    }
+
+    public Property FindProperty(BacnetObjectId objectId, BacnetPropertyIds propertyId)
+    {
+        //liniear search
+        var obj = FindObject(objectId);
+        return FindProperty(obj, propertyId);
+    }
+
+    private static Property FindProperty(Object obj, BacnetPropertyIds propertyId)
+    {
+        //liniear search
+        return obj?.Properties.FirstOrDefault(p => p.Id == propertyId);
+    }
+
+    private Object FindObject(BacnetObjectTypes objectType)
+    {
+        //liniear search
+        return Objects.FirstOrDefault(obj => obj.Type == objectType);
+    }
+
+    public Object FindObject(BacnetObjectId objectId)
+    {
+        //liniear search
+        return Objects.FirstOrDefault(obj => obj.Type == objectId.type && obj.Instance == objectId.instance);
+    }
+
+    public enum ErrorCodes
+    {
+        Good = 0,
+        GenericError = -1,
+        NotExist = -2,
+        NotForMe = -3,
+        WriteAccessDenied = -4,
+        UnknownObject = -5,
+        UnknownProperty = -6
+    }
+
+    public int ReadPropertyValue(BacnetObjectId objectId, BacnetPropertyIds propertyId)
+    {
+        if (ReadProperty(objectId, propertyId, Serialize.ASN1.BACNET_ARRAY_ALL, out IList<BacnetValue> value) != ErrorCodes.Good)
+            return 0;
+
+        if (value == null || value.Count < 1)
+            return 0;
+
+        return (int)Convert.ChangeType(value[0].Value, typeof(int));
+    }
+
+    public ErrorCodes ReadProperty(BacnetObjectId objectId, BacnetPropertyIds propertyId, uint arrayIndex, out IList<BacnetValue> value)
+    {
+        value = new BacnetValue[0];
+
+        //wildcard device_id
+        if (objectId.type == BacnetObjectTypes.OBJECT_DEVICE && objectId.instance >= Serialize.ASN1.BACNET_MAX_INSTANCE)
+            objectId.instance = DeviceId;
+
+        //overrides
+        if (ReadOverride != null)
+        {
+            ReadOverride(objectId, propertyId, arrayIndex, out value, out ErrorCodes status, out bool handled);
+            if (handled)
+                return status;
+        }
+
+        //find in storage
+        var obj = FindObject(objectId);
+        if (obj == null)
+            return ErrorCodes.UnknownObject;
+
+        //object found now find property
+        Godot.GD.Print("object "+objectId+"|property "+propertyId);
+        var p = FindProperty(objectId, propertyId);
+        if (p == null)
+            return ErrorCodes.NotExist;
+
+        //get value ... check for array index
+        if (arrayIndex == 0)
+        {
+            value = new[] { new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT, (uint)p.BacnetValue.Count) };
+        }
+        else if (arrayIndex != Serialize.ASN1.BACNET_ARRAY_ALL)
+        {
+            value = new[] { p.BacnetValue[(int)arrayIndex - 1] };
+        }
+        else
+        {
+            value = p.BacnetValue;
+        }
+        Godot.GD.Print("p "+p.BacnetValue.Count());
+
+        return ErrorCodes.Good;
+    }
+
+    public void ReadPropertyMultiple(BacnetObjectId objectId, ICollection<BacnetPropertyReference> properties, out IList<BacnetPropertyValue> values)
+    {
+        var valuesRet = new List<BacnetPropertyValue>();
+
+        foreach (var entry in properties)
+        {
+            var newEntry = new BacnetPropertyValue { property = entry };
+
+            switch (ReadProperty(objectId, (BacnetPropertyIds)entry.propertyIdentifier, entry.propertyArrayIndex, out newEntry.value))
+            {
+                case ErrorCodes.UnknownObject:
+                    newEntry.value = new[]
+                    {
+                            new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR,
+                            new BacnetError(BacnetErrorClasses.ERROR_CLASS_OBJECT, BacnetErrorCodes.ERROR_CODE_UNKNOWN_OBJECT))
+                        };
+                    break;
+                case ErrorCodes.NotExist:
+                    newEntry.value = new[]
+                    {
+                            new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR,
+                            new BacnetError(BacnetErrorClasses.ERROR_CLASS_PROPERTY, BacnetErrorCodes.ERROR_CODE_UNKNOWN_PROPERTY))
+                        };
+                    break;
+            }
+
+            valuesRet.Add(newEntry);
+        }
+
+        values = valuesRet;
+    }
+
+    public bool ReadPropertyAll(BacnetObjectId objectId, out IList<BacnetPropertyValue> values)
+    {
+        //find
+        var obj = FindObject(objectId);
+        if (obj == null)
+        {
+            values = null;
+            return false;
+        }
+
+        //build
+        var propertyValues = new BacnetPropertyValue[obj.Properties.Length];
+        for (var i = 0; i < obj.Properties.Length; i++)
+        {
+            var newEntry = new BacnetPropertyValue
+            {
+                property = new BacnetPropertyReference((uint)obj.Properties[i].Id, Serialize.ASN1.BACNET_ARRAY_ALL)
+            };
+
+            if (ReadProperty(objectId, obj.Properties[i].Id, Serialize.ASN1.BACNET_ARRAY_ALL, out newEntry.value) != ErrorCodes.Good)
+            {
+                var bacnetError = new BacnetError(BacnetErrorClasses.ERROR_CLASS_OBJECT, BacnetErrorCodes.ERROR_CODE_UNKNOWN_PROPERTY);
+                newEntry.value = new[] { new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_ERROR, bacnetError) };
+            }
+
+            propertyValues[i] = newEntry;
+        }
+
+        values = propertyValues;
+        return true;
+    }
+
+    public void WritePropertyValue(BacnetObjectId objectId, BacnetPropertyIds propertyId, int value)
+    {
+        //get existing type
+        if (ReadProperty(objectId, propertyId, Serialize.ASN1.BACNET_ARRAY_ALL, out IList<BacnetValue> readValues) != ErrorCodes.Good)
+            return;
+
+        if (readValues == null || readValues.Count == 0)
+            return;
+
+        //write
+        WriteProperty(objectId, propertyId, Serialize.ASN1.BACNET_ARRAY_ALL, new[]
+        {
+                new BacnetValue(readValues[0].Tag, Convert.ChangeType(value, readValues[0].Value.GetType()))
+            });
+    }
+
+
+    public void WriteProperty(BacnetObjectId objectId, BacnetPropertyIds propertyId, BacnetValue value)
+    {
+        WriteProperty(objectId, propertyId, Serialize.ASN1.BACNET_ARRAY_ALL, new[] { value });
+    }
+
+    public ErrorCodes WriteProperty(BacnetObjectId objectId, BacnetPropertyIds propertyId, uint arrayIndex, IList<BacnetValue> value, bool addIfNotExits = false)
+    {
+        //wildcard device_id
+        if (objectId.type == BacnetObjectTypes.OBJECT_DEVICE && objectId.instance >= Serialize.ASN1.BACNET_MAX_INSTANCE)
+            objectId.instance = DeviceId;
+
+        //overrides
+        if (WriteOverride != null)
+        {
+            WriteOverride(objectId, propertyId, arrayIndex, value, out ErrorCodes status, out bool handled);
+            if (handled)
+                return status;
+        }
+
+        //find
+        var p = FindProperty(objectId, propertyId);
+        if (p == null)
+        {
+            if (!addIfNotExits) return ErrorCodes.NotExist;
+
+            //add obj
+            var obj = FindObject(objectId);
+            if (obj == null)
+            {
+                obj = new Object
+                {
+                    Type = objectId.type,
+                    Instance = objectId.instance
+                };
+                var arr = Objects;
+                Array.Resize(ref arr, arr.Length + 1);
+                arr[arr.Length - 1] = obj;
+                Objects = arr;
+            }
+
+            //add property
+            p = new Property { Id = propertyId };
+            var props = obj.Properties;
+            Array.Resize(ref props, props.Length + 1);
+            props[props.Length - 1] = p;
+            obj.Properties = props;
+        }
+
+        //set type if needed
+        if (p.Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL && value != null)
+        {
+            foreach (var v in value)
+            {
+                if (v.Tag == BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL)
+                    continue;
+
+                p.Tag = v.Tag;
+                break;
+            }
+        }
+
+        //write
+        p.BacnetValue = value;
+
+        //send event ... for subscriptions
+        ChangeOfValue?.Invoke(this, objectId, propertyId, arrayIndex, value);
+
+        return ErrorCodes.Good;
+    }
+
+    // Write PROP_PRESENT_VALUE or PROP_RELINQUISH_DEFAULT in an object with a 16 level PROP_PRIORITY_ARRAY (BACNET_APPLICATION_TAG_NULL)
+    public ErrorCodes WriteCommandableProperty(BacnetObjectId objectId, BacnetPropertyIds propertyId, BacnetValue value, uint priority)
+    {
+
+        if (propertyId != BacnetPropertyIds.PROP_PRESENT_VALUE)
+            return ErrorCodes.NotForMe;
+
+        var presentvalue = FindProperty(objectId, BacnetPropertyIds.PROP_PRESENT_VALUE);
+        if (presentvalue == null)
+            return ErrorCodes.NotForMe;
+
+        var relinquish = FindProperty(objectId, BacnetPropertyIds.PROP_RELINQUISH_DEFAULT);
+        if (relinquish == null)
+            return ErrorCodes.NotForMe;
+
+        var outOfService = FindProperty(objectId, BacnetPropertyIds.PROP_OUT_OF_SERVICE);
+        if (outOfService == null)
+            return ErrorCodes.NotForMe;
+
+        var array = FindProperty(objectId, BacnetPropertyIds.PROP_PRIORITY_ARRAY);
+        if (array == null)
+            return ErrorCodes.NotForMe;
+
+        var errorcode = ErrorCodes.GenericError;
+
+        try
+        {
+            // If PROP_OUT_OF_SERVICE=True, value is accepted as is : http://www.bacnetwiki.com/wiki/index.php?title=Priority_Array                 
+            if ((bool)outOfService.BacnetValue[0].Value && propertyId == BacnetPropertyIds.PROP_PRESENT_VALUE)
+            {
+                WriteProperty(objectId, BacnetPropertyIds.PROP_PRESENT_VALUE, value);
+                return ErrorCodes.Good;
+            }
+
+            IList<BacnetValue> valueArray = null;
+
+            // Thank's to Steve Karg
+            // The 135-2016 text:
+            // 19.2.2 Application Priority Assignments
+            // All commandable objects within a device shall be configurable to accept writes to all priorities except priority 6
+            if (priority == 6)
+                return ErrorCodes.WriteAccessDenied;
+
+            // http://www.chipkin.com/changing-the-bacnet-present-value-or-why-the-present-value-doesn%E2%80%99t-change/
+            // Write Property PROP_PRESENT_VALUE : A value is placed in the PROP_PRIORITY_ARRAY
+            if (propertyId == BacnetPropertyIds.PROP_PRESENT_VALUE)
+            {
+                errorcode = ErrorCodes.Good;
+
+                valueArray = array.BacnetValue;
+                if (value.Value == null)
+                    valueArray[(int)priority - 1] = new BacnetValue(null);
+                else
+                    valueArray[(int)priority - 1] = value;
+                array.BacnetValue = valueArray;
+            }
+
+            // Look on the priority Array to find the first value to be set in PROP_PRESENT_VALUE
+            if (errorcode == ErrorCodes.Good)
+            {
+
+                var done = false;
+                for (var i = 0; i < 16; i++)
+                {
+                    if (valueArray[i].Value == null)
+                        continue;
+
+                    WriteProperty(objectId, BacnetPropertyIds.PROP_PRESENT_VALUE, valueArray[i]);
+                    done = true;
+                    break;
+                }
+
+                if (done == false)  // Nothing in the array : PROP_PRESENT_VALUE = PROP_RELINQUISH_DEFAULT
+                {
+                    var defaultValue = relinquish.BacnetValue;
+                    WriteProperty(objectId, BacnetPropertyIds.PROP_PRESENT_VALUE, defaultValue[0]);
+                }
+            }
+        }
+        catch
+        {
+            errorcode = ErrorCodes.GenericError;
+        }
+
+        return errorcode;
+    }
+
+    public ErrorCodes[] WritePropertyMultiple(BacnetObjectId objectId, ICollection<BacnetPropertyValue> values)
+    {
+        return values
+            .Select(v => WriteProperty(objectId, (BacnetPropertyIds)v.property.propertyIdentifier, v.property.propertyArrayIndex, v.value))
+            .ToArray();
+    }
+
+    /// <summary>
+    /// Store the class, as XML file
+    /// </summary>
+    /// <param name="path"></param>
+    public void Save(string path)
+    {
+        var s = new XmlSerializer(typeof(DeviceStorage));
+        using var fs = new FileStream(path, FileMode.Create, FileAccess.Write);
+        s.Serialize(fs, this);
+    }
+
+    /// <summary>
+    /// Load XML values into class
+    /// </summary>
+    /// <param name="path">Embedded or external file</param>
+    /// <param name="deviceId">Optional deviceId other than the one in the Xml file</param>
+    /// <returns></returns>
+    public static DeviceStorage Load(string path, uint? deviceId = null)
+    {
+        StreamReader textStreamReader;
+
+        var assembly = Assembly.GetCallingAssembly();
+
+        try
+        {
+            // check if the xml file is an embedded resource
+            textStreamReader = new StreamReader(assembly.GetManifestResourceStream(path));
+        }
+        catch
+        {
+            // if not check the external file
+            if (!File.Exists(path))
+                throw new Exception("No AppSettings found");
+
+            textStreamReader = new StreamReader(path);
+        }
+
+        var s = new XmlSerializer(typeof(DeviceStorage));
+
+        using (textStreamReader)
+        {
+            var ret = (DeviceStorage)s.Deserialize(textStreamReader);
+
+            //set device_id
+            var obj = ret.FindObject(BacnetObjectTypes.OBJECT_DEVICE);
+            if (obj != null)
+                ret.DeviceId = obj.Instance;
+
+            // use the deviceId in the Xml file or another one
+            if (!deviceId.HasValue)
+                return ret;
+
+            ret.DeviceId = deviceId.Value;
+            if (obj == null)
+                return ret;
+
+            // change the value
+            obj.Instance = deviceId.Value;
+            IList<BacnetValue> val = new[]
+            {
+                    new BacnetValue(BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID, $"OBJECT_DEVICE:{deviceId.Value}")
+                };
+
+            ret.WriteProperty(new BacnetObjectId(BacnetObjectTypes.OBJECT_DEVICE,
+                Serialize.ASN1.BACNET_MAX_INSTANCE), BacnetPropertyIds.PROP_OBJECT_IDENTIFIER, 1, val, true);
+
+            return ret;
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Object.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Object.cs
new file mode 100644
index 0000000..baecc62
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Object.cs
@@ -0,0 +1,18 @@
+namespace System.IO.BACnet.Storage;
+
+[Serializable]
+public class Object
+{
+    [XmlAttribute]
+    public BacnetObjectTypes Type { get; set; }
+
+    [XmlAttribute]
+    public uint Instance { get; set; }
+
+    public Property[] Properties { get; set; }
+
+    public Object()
+    {
+        Properties = new Property[0];
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Property.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Property.cs
new file mode 100644
index 0000000..b4d2418
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Storage/Property.cs
@@ -0,0 +1,127 @@
+namespace System.IO.BACnet.Storage;
+
+[Serializable]
+public class Property
+{
+    [XmlIgnore]
+    public BacnetPropertyIds Id { get; set; }
+
+    [XmlAttribute("Id")]
+    public string IdText
+    {
+        get
+        {
+            return Id.ToString();
+        }
+        set
+        {
+            Id = (BacnetPropertyIds)Enum.Parse(typeof(BacnetPropertyIds), value);
+        }
+    }
+
+    [XmlAttribute]
+    public BacnetApplicationTags Tag { get; set; }
+
+    [XmlElement]
+    public string[] Value { get; set; }
+
+    public static BacnetValue DeserializeValue(string value, BacnetApplicationTags type)
+    {
+        switch (type)
+        {
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL:
+                return value == ""
+                    ? new BacnetValue(type, null)
+                    : new BacnetValue(value);
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BOOLEAN:
+                return new BacnetValue(type, bool.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_UNSIGNED_INT:
+                return new BacnetValue(type, uint.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_SIGNED_INT:
+                return new BacnetValue(type, int.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL:
+                return new BacnetValue(type, float.Parse(value, CultureInfo.InvariantCulture));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE:
+                return new BacnetValue(type, double.Parse(value, CultureInfo.InvariantCulture));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING:
+                try
+                {
+                    return new BacnetValue(type, Convert.FromBase64String(value));
+                }
+                catch
+                {
+                    return new BacnetValue(type, value);
+                }
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_DECODED:
+                try
+                {
+                    return new BacnetValue(type, Convert.FromBase64String(value));
+                }
+                catch
+                {
+                    return new BacnetValue(type, value);
+                }
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_CHARACTER_STRING:
+                return new BacnetValue(type, value);
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_BIT_STRING:
+                return new BacnetValue(type, BacnetBitString.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_ENUMERATED:
+                return new BacnetValue(type, uint.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DATE:
+                return new BacnetValue(type, DateTime.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_TIME:
+                return new BacnetValue(type, DateTime.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_ID:
+                return new BacnetValue(type, BacnetObjectId.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_READ_ACCESS_SPECIFICATION:
+                return new BacnetValue(type, BacnetReadAccessSpecification.Parse(value));
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OBJECT_PROPERTY_REFERENCE:
+                return new BacnetValue(type, BacnetDeviceObjectPropertyReference.Parse(value));
+            default:
+                return new BacnetValue(type, null);
+        }
+    }
+
+    public static string SerializeValue(BacnetValue value, BacnetApplicationTags type)
+    {
+        switch (type)
+        {
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_NULL:
+                return value.ToString(); // Modif FC
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_REAL:
+                return ((float)value.Value).ToString(CultureInfo.InvariantCulture);
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_DOUBLE:
+                return ((double)value.Value).ToString(CultureInfo.InvariantCulture);
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_OCTET_STRING:
+                return Convert.ToBase64String((byte[])value.Value);
+            case BacnetApplicationTags.BACNET_APPLICATION_TAG_CONTEXT_SPECIFIC_DECODED:
+                {
+                    return value.Value is byte[]? Convert.ToBase64String((byte[])value.Value)
+                        : string.Join(";", ((BacnetValue[])value.Value)
+                            .Select(v => SerializeValue(v, v.Tag)));
+                }
+            default:
+                return value.Value.ToString();
+        }
+    }
+
+    [XmlIgnore]
+    public IList<BacnetValue> BacnetValue
+    {
+        get
+        {
+            if (Value == null)
+                return new BacnetValue[0];
+
+            var ret = new BacnetValue[Value.Length];
+            for (var i = 0; i < ret.Length; i++)
+                ret[i] = DeserializeValue(Value[i], Tag);
+
+            return ret;
+        }
+        set
+        {
+            Value = value.Select(v => SerializeValue(v, Tag)).ToArray();
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BVLCV6.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BVLCV6.cs
new file mode 100644
index 0000000..012cfe8
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BVLCV6.cs
@@ -0,0 +1,351 @@
+namespace System.IO.BACnet;
+
+// Only some elements here are really tested
+// all FDR, BBMD activities is just a copy/adaptation of my IPv4 code
+// Code for V4 working fine, for V6 sure not before a series of tests
+public class BVLCV6
+{
+    public const byte BVLL_TYPE_BACNET_IPV6 = 0x82;
+    public const byte BVLC_HEADER_LENGTH = 10; // Not all the time, could be 7 for bacnet broadcast
+    public const BacnetMaxAdpu BVLC_MAX_APDU = BacnetMaxAdpu.MAX_APDU1476;
+    // Contains the rules to accept FRD based on the IP adress
+    // If empty it's equal to * , everyone allows
+    private readonly List<Regex> _autorizedFDR = new();
+
+    private bool _bbmdFdServiceActivated;
+    private readonly List<IPEndPoint> _bbmds = new();
+    private readonly BacnetAddress _broadcastAdd;
+    // Two lists for optional BBMD activity
+    private readonly List<KeyValuePair<IPEndPoint, DateTime>> _foreignDevices = new();
+    private readonly BacnetIpV6UdpProtocolTransport _myTransport;
+    public bool RandomVmac;
+
+    public byte[] VMAC = new byte[3];
+    public ILog Log { get; set; } = LogManager.GetLogger<BVLCV6>();
+
+    public BVLCV6(BacnetIpV6UdpProtocolTransport transport, int vMac)
+    {
+        _myTransport = transport;
+        _broadcastAdd = _myTransport.GetBroadcastAddress();
+
+        if (vMac == -1)
+        {
+            RandomVmac = true;
+            new Random().NextBytes(VMAC);
+            VMAC[0] = (byte)((VMAC[0] & 0x7F) | 0x40); // ensure 01xxxxxx on the High byte    
+
+            // Open with default interface specified, cannot send it or 
+            // it will generate an uncheckable continuous local loopback
+            if (!_myTransport.LocalEndPoint.ToString().Contains("[::]"))
+                SendAddressResolutionRequest(VMAC);
+            else
+                RandomVmac = false; // back to false avoiding loop back
+        }
+        else // Device Id is the Vmac Id
+        {
+            VMAC[0] = (byte)((vMac >> 16) & 0x3F); // ensure the 2 high bits are 0 on the High byte
+            VMAC[1] = (byte)((vMac >> 8) & 0xFF);
+            VMAC[2] = (byte)(vMac & 0xFF);
+            // unicity is guaranteed by the end user !
+        }
+    }
+
+    public void AddFDRAutorisationRule(Regex ipRule)
+    {
+        _autorizedFDR.Add(ipRule);
+    }
+
+    // Used to initiate the BBMD & FD behaviour, if BBMD is null it start the FD activity only
+    public void AddBBMDPeer(IPEndPoint bbmd)
+    {
+        _bbmdFdServiceActivated = true;
+
+        if (bbmd == null)
+            return;
+
+        lock (_bbmds)
+            _bbmds.Add(bbmd);
+    }
+
+    // Add a FD to the table or renew it
+    private void RegisterForeignDevice(IPEndPoint sender, int ttl)
+    {
+        lock (_foreignDevices)
+        {
+            // remove it, if any
+            _foreignDevices.Remove(_foreignDevices.Find(item => item.Key.Equals(sender)));
+            // TTL + 30s grace period
+            var Expiration = DateTime.Now.AddSeconds(ttl + 30);
+            // add it
+            if (_autorizedFDR.Count == 0) // No rules, accept all
+            {
+                _foreignDevices.Add(new KeyValuePair<IPEndPoint, DateTime>(sender, Expiration));
+                return;
+            }
+
+            if (_autorizedFDR.Any(r => r.Match(sender.Address.ToString()).Success))
+            {
+                _foreignDevices.Add(new KeyValuePair<IPEndPoint, DateTime>(sender, Expiration));
+                return;
+            }
+
+            Log.Info($"Rejected FDR registration, IP : {sender.Address}");
+        }
+    }
+
+    // Send a Frame to each registered foreign devices, except the original sender
+    private void SendToFDs(byte[] buffer, int msgLength, IPEndPoint epSender = null)
+    {
+        lock (_foreignDevices)
+        {
+            // remove oldest Device entries (Time expiration > TTL + 30s delay)
+            _foreignDevices.Remove(_foreignDevices.Find(item => DateTime.Now > item.Value));
+            // Send to all others, except the original sender
+            foreach (var client in _foreignDevices)
+            {
+                if (!client.Key.Equals(epSender))
+                    _myTransport.Send(buffer, msgLength, client.Key);
+            }
+        }
+    }
+
+    // Send a Frame to each registered BBMD
+    private void SendToBBMDs(byte[] buffer, int msgLength)
+    {
+        lock (_bbmds)
+        {
+            foreach (var ep in _bbmds)
+            {
+                _myTransport.Send(buffer, msgLength, ep);
+            }
+        }
+    }
+
+    // Never tested
+    private void Forward_NPDU(byte[] buffer, int msgLength, bool toGlobalBroadcast, IPEndPoint epSender, BacnetAddress bacSender)
+    {
+        // Forms the forwarded NPDU from the original (broadcast npdu), and send it to all
+
+        // copy, 18 bytes shifted (orignal bvlc header : 7 bytes, new one : 25 bytes)
+        var b = new byte[msgLength + 18];
+        // normaly only 'small' frames are present here, so no need to check if it's to big for Udp
+        Array.Copy(buffer, 0, b, 18, msgLength);
+
+        // 7 bytes for the BVLC Header, with the embedded 6 bytes IP:Port of the original sender
+        First7BytesHeaderEncode(b, BacnetBvlcV6Functions.BVLC_FORWARDED_NPDU, msgLength + 18);
+        // replace my Vmac by the orignal source vMac
+        Array.Copy(bacSender.VMac, 0, b, 4, 3);
+        // Add IpV6 endpoint
+        Array.Copy(bacSender.adr, 0, b, 7, 18);
+        // Send To BBMD
+        SendToBBMDs(b, msgLength + 18);
+        // Send To FD, except the sender
+        SendToFDs(b, msgLength + 18, epSender);
+        // Broadcast if required
+        if (toGlobalBroadcast)
+        {
+            BacnetIpV6UdpProtocolTransport.Convert(_broadcastAdd, out IPEndPoint ep);
+            _myTransport.Send(b, msgLength + 18, ep);
+        }
+    }
+
+    private void First7BytesHeaderEncode(byte[] b, BacnetBvlcV6Functions function, int msgLength)
+    {
+        b[0] = BVLL_TYPE_BACNET_IPV6;
+        b[1] = (byte)function;
+        b[2] = (byte)((msgLength & 0xFF00) >> 8);
+        b[3] = (byte)((msgLength & 0x00FF) >> 0);
+        Array.Copy(VMAC, 0, b, 4, 3);
+    }
+
+    // Send ack or nack
+    private void SendResult(IPEndPoint sender, BacnetBvlcV6Results resultCode)
+    {
+        var b = new byte[9];
+        First7BytesHeaderEncode(b, BacnetBvlcV6Functions.BVLC_RESULT, 9);
+        b[7] = (byte)(((ushort)resultCode & 0xFF00) >> 8);
+        b[8] = (byte)((ushort)resultCode & 0xFF);
+        _myTransport.Send(b, 9, sender);
+    }
+
+    public void SendRegisterAsForeignDevice(IPEndPoint bbmd, short ttl)
+    {
+        var b = new byte[9];
+        First7BytesHeaderEncode(b, BacnetBvlcV6Functions.BVLC_REGISTER_FOREIGN_DEVICE, 9);
+        b[7] = (byte)((ttl & 0xFF00) >> 8);
+        b[8] = (byte)(ttl & 0xFF);
+        _myTransport.Send(b, 9, bbmd);
+    }
+
+    public void SendRemoteWhois(byte[] buffer, IPEndPoint bbmd, int msgLength)
+    {
+        // 7 bytes for the BVLC Header
+        First7BytesHeaderEncode(buffer, BacnetBvlcV6Functions.BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK, msgLength);
+        _myTransport.Send(buffer, msgLength, bbmd);
+    }
+
+    // Send ack
+    private void SendAddressResolutionAck(IPEndPoint sender, byte[] vMacDest, BacnetBvlcV6Functions function)
+    {
+        var b = new byte[10];
+        First7BytesHeaderEncode(b, function, 10);
+        Array.Copy(vMacDest, 0, b, 7, 3);
+        _myTransport.Send(b, 10, sender);
+    }
+
+    // quite the same frame as the previous one
+    private void SendAddressResolutionRequest(byte[] vMacDest)
+    {
+        BacnetIpV6UdpProtocolTransport.Convert(_broadcastAdd, out IPEndPoint ep);
+
+        var b = new byte[10];
+        First7BytesHeaderEncode(b, BacnetBvlcV6Functions.BVLC_ADDRESS_RESOLUTION, 10);
+        Array.Copy(vMacDest, 0, b, 7, 3);
+        _myTransport.Send(b, 10, ep);
+    }
+
+    // Encode is called by internal services if the BBMD is also an active device
+    public int Encode(byte[] buffer, int offset, BacnetBvlcV6Functions function, int msgLength, BacnetAddress address)
+    {
+        // offset always 0, we are the first after udp
+        First7BytesHeaderEncode(buffer, function, msgLength);
+
+        // BBMD service
+        if (function == BacnetBvlcV6Functions.BVLC_ORIGINAL_BROADCAST_NPDU && _bbmdFdServiceActivated)
+        {
+            var me = _myTransport.LocalEndPoint;
+            BacnetIpV6UdpProtocolTransport.Convert(me, out var bacme);
+            Array.Copy(VMAC, bacme.VMac, 3);
+
+            Forward_NPDU(buffer, msgLength, false, me, bacme); // send to all BBMDs and FDs
+
+            return 7; // ready to send
+        }
+
+        if (function != BacnetBvlcV6Functions.BVLC_ORIGINAL_UNICAST_NPDU)
+            return 0; // ?
+
+        buffer[7] = address.VMac[0];
+        buffer[8] = address.VMac[1];
+        buffer[9] = address.VMac[2];
+        return 10; // ready to send
+    }
+
+    // Decode is called each time an Udp Frame is received
+    public int Decode(byte[] buffer, int offset, out BacnetBvlcV6Functions function, out int msgLength,
+        IPEndPoint sender, BacnetAddress remoteAddress)
+    {
+        // offset always 0, we are the first after udp
+        // and a previous test by the caller guaranteed at least 4 bytes into the buffer
+
+        function = (BacnetBvlcV6Functions)buffer[1];
+        msgLength = (buffer[2] << 8) | (buffer[3] << 0);
+        if (buffer[0] != BVLL_TYPE_BACNET_IPV6 || buffer.Length != msgLength) return -1;
+
+        Array.Copy(buffer, 4, remoteAddress.VMac, 0, 3);
+
+        switch (function)
+        {
+            case BacnetBvlcV6Functions.BVLC_RESULT:
+                return 9; // only for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_ORIGINAL_UNICAST_NPDU:
+                return 10; // only for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_ORIGINAL_BROADCAST_NPDU:
+                // Send to FDs & BBMDs, not broadcast or it will be made twice !
+                if (_bbmdFdServiceActivated)
+                    Forward_NPDU(buffer, msgLength, false, sender, remoteAddress);
+                return 7; // also for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_ADDRESS_RESOLUTION:
+                // need to verify that the VMAC is mine
+                if (VMAC[0] == buffer[7] && VMAC[1] == buffer[8] && VMAC[2] == buffer[9])
+                    // coming from myself ? avoid loopback
+                    if (!_myTransport.LocalEndPoint.Equals(sender))
+                        SendAddressResolutionAck(sender, remoteAddress.VMac,
+                            BacnetBvlcV6Functions.BVLC_ADDRESS_RESOLUTION_ACK);
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_FORWARDED_ADDRESS_RESOLUTION:
+                // no need to verify the target VMAC, should be OK
+                SendAddressResolutionAck(sender, remoteAddress.VMac,
+                    BacnetBvlcV6Functions.BVLC_ADDRESS_RESOLUTION_ACK);
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_ADDRESS_RESOLUTION_ACK: // adresse conflict
+                if (VMAC[0] == buffer[4] && VMAC[1] == buffer[5] && VMAC[2] == buffer[6] && RandomVmac)
+                {
+                    new Random().NextBytes(VMAC);
+                    VMAC[0] = (byte)((VMAC[0] & 0x7F) | 0x40);
+                    SendAddressResolutionRequest(VMAC);
+                }
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_VIRTUAL_ADDRESS_RESOLUTION:
+                SendAddressResolutionAck(sender, remoteAddress.VMac,
+                    BacnetBvlcV6Functions.BVLC_VIRTUAL_ADDRESS_RESOLUTION_ACK);
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_VIRTUAL_ADDRESS_RESOLUTION_ACK:
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_FORWARDED_NPDU:
+                if (_myTransport.LocalEndPoint.Equals(sender)) return 0;
+
+                // certainly TODO the same code I've put in the IPV4 implementation
+                if (_bbmdFdServiceActivated && msgLength >= 25)
+                {
+                    bool ret;
+                    lock (_bbmds)
+                        ret = _bbmds.Exists(items => items.Equals(sender)); // verify sender presence in the table
+                                                                            // avoid also loopback
+
+                    if (ret) // message from a know BBMD address, sent to all FDs and broadcast
+                    {
+                        SendToFDs(buffer, msgLength); // send without modification
+                                                      // Assume all BVLC_FORWARDED_NPDU are directly sent to me in the 
+                                                      // unicast mode and not by the way of the multicast address
+                                                      // If not, it's not really a big problem, devices on the local net will 
+                                                      // receive two times the message (after all it's just WhoIs, Iam, ...)
+                        BacnetIpV6UdpProtocolTransport.Convert(_broadcastAdd, out IPEndPoint ep);
+                        _myTransport.Send(buffer, msgLength, ep);
+                    }
+                }
+                return 25; // for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_REGISTER_FOREIGN_DEVICE:
+                if (_bbmdFdServiceActivated && msgLength == 9)
+                {
+                    var TTL = (buffer[7] << 8) + buffer[8]; // unit is second
+                    RegisterForeignDevice(sender, TTL);
+                    SendResult(sender, BacnetBvlcV6Results.SUCCESSFUL_COMPLETION); // ack
+                }
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_DELETE_FOREIGN_DEVICE_TABLE_ENTRY:
+                return 0; // not for the upper layers    
+
+            case BacnetBvlcV6Functions.BVLC_SECURE_BVLC:
+                return 0; // not for the upper layers
+
+            case BacnetBvlcV6Functions.BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK: // Sent by a Foreign Device, not a BBMD
+                if (_bbmdFdServiceActivated)
+                {
+                    // Send to FDs except the sender, BBMDs and broadcast
+                    lock (_foreignDevices)
+                    {
+                        if (_foreignDevices.Exists(item => item.Key.Equals(sender))) // verify previous registration
+                            Forward_NPDU(buffer, msgLength, true, sender, remoteAddress);
+                        else
+                            SendResult(sender, BacnetBvlcV6Results.DISTRIBUTE_BROADCAST_TO_NETWORK_NAK);
+                    }
+                }
+                return 0; // not for the upper layers
+
+            // error encoding function or experimental one
+            default:
+                return -1;
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpUdpProtocolTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpUdpProtocolTransport.cs
new file mode 100644
index 0000000..249b7c7
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpUdpProtocolTransport.cs
@@ -0,0 +1,465 @@
+/**************************************************************************
+*                           MIT License
+* 
+* Copyright (C) 2014 Morten Kvistgaard <mk@pch-engineering.dk>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+namespace System.IO.BACnet;
+
+/// <summary>
+/// This is the standard BACNet udp transport
+/// </summary>
+public class BacnetIpUdpProtocolTransport : BacnetTransportBase
+{
+    private UdpClient _sharedConn;
+    private UdpClient _exclusiveConn;
+    private readonly bool _exclusivePort;
+    private readonly bool _dontFragment;
+    private readonly string _localEndpoint;
+    private BacnetAddress _broadcastAddress;
+    private bool _disposing;
+
+    public BVLC Bvlc { get; private set; }
+    public int SharedPort { get; }
+    public int ExclusivePort { get; }
+
+    // Give 0.0.0.0:xxxx if the socket is open with System.Net.IPAddress.Any
+    // Today only used by _GetBroadcastAddress method & the bvlc layer class in BBMD mode
+    // Some more complex solutions could avoid this, that's why this property is virtual
+    public virtual IPEndPoint LocalEndPoint => (IPEndPoint)_exclusiveConn.Client.LocalEndPoint;
+
+    public BacnetIpUdpProtocolTransport(int port, bool useExclusivePort = false, bool dontFragment = false,
+        int maxPayload = 1472, string localEndpointIp = "")
+    {
+        SharedPort = port;
+        MaxBufferLength = maxPayload;
+        Type = BacnetAddressTypes.IP;
+        HeaderLength = BVLC.BVLC_HEADER_LENGTH;
+        MaxAdpuLength = BVLC.BVLC_MAX_APDU;
+
+        _exclusivePort = useExclusivePort;
+        _dontFragment = dontFragment;
+        _localEndpoint = localEndpointIp;
+    }
+
+    public BacnetIpUdpProtocolTransport(int sharedPort, int exclusivePort, bool dontFragment = false,
+        int maxPayload = 1472, string localEndpointIp = "")
+        : this(sharedPort, false, dontFragment, maxPayload, localEndpointIp)
+    {
+        ExclusivePort = exclusivePort;
+    }
+
+    public override bool Equals(object obj)
+    {
+        var a = obj as BacnetIpUdpProtocolTransport;
+        return a?.SharedPort == SharedPort;
+    }
+
+    public override int GetHashCode()
+    {
+        return SharedPort.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return $"Udp:{SharedPort}";
+    }
+
+    private void Open()
+    {
+        if (!_exclusivePort)
+        {
+            /* We need a shared broadcast "listen" port. This is the 0xBAC0 port */
+            /* This will enable us to have more than 1 client, on the same machine. Perhaps it's not that important though. */
+            /* We (might) only recieve the broadcasts on this. Any unicasts to this might be eaten by another local client */
+            if (_sharedConn == null)
+            {
+                _sharedConn = new UdpClient { ExclusiveAddressUse = false };
+                _sharedConn.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+                var ep = new IPEndPoint(IPAddress.Any, SharedPort);
+                if (!string.IsNullOrEmpty(_localEndpoint)) ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), SharedPort);
+                DisableConnReset(_sharedConn);
+                _sharedConn.Client.Bind(ep);
+                SetDontFragment(_sharedConn, _dontFragment);
+                Log.Info($"Binded shared {ep} using UDP");
+            }
+            /* This is our own exclusive port. We'll recieve everything sent to this. */
+            /* So this is how we'll present our selves to the world */
+            if (_exclusiveConn == null)
+            {
+                var ep = new IPEndPoint(IPAddress.Any, ExclusivePort);
+                if (!string.IsNullOrEmpty(_localEndpoint)) ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), ExclusivePort);
+                _exclusiveConn = new UdpClient(ep);
+
+                // Gets the Endpoint : the assigned Udp port number in fact
+                ep = (IPEndPoint)_exclusiveConn.Client.LocalEndPoint;
+                // closes the socket
+                _exclusiveConn.Close();
+                // Re-opens it with the freeed port number, to be sure it's a real active/server socket
+                // which cannot be disarmed for listen by .NET for incoming call after a few inactivity
+                // minutes ... yes it's like this at least on several systems
+                _exclusiveConn = new UdpClient(ep)
+                {
+                    EnableBroadcast = true
+                };
+                SetDontFragment(_exclusiveConn, _dontFragment);
+                DisableConnReset(_exclusiveConn);
+            }
+        }
+        else
+        {
+            var ep = new IPEndPoint(IPAddress.Any, SharedPort);
+            if (!string.IsNullOrEmpty(_localEndpoint)) ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), SharedPort);
+            _exclusiveConn = new UdpClient { ExclusiveAddressUse = true };
+            DisableConnReset(_exclusiveConn);
+            _exclusiveConn.Client.Bind(ep);
+            SetDontFragment(_exclusiveConn, _dontFragment);
+            _exclusiveConn.EnableBroadcast = true;
+            Log.Info($"Binded exclusively to {ep} using UDP");
+        }
+
+        Bvlc = new BVLC(this);
+    }
+
+    /// <summary>
+    ///   Prevent exception on setting Don't Fragment on OSX
+    /// </summary>
+    /// <remarks>
+    ///   https://github.com/dotnet/runtime/issues/27653
+    /// </remarks>
+    /// <param name="client"></param>
+    /// <param name="dontFragment"></param>
+    private void SetDontFragment(UdpClient client, bool dontFragment)
+    {
+        if (Environment.OSVersion.Platform != PlatformID.MacOSX)
+        {
+            try
+            {
+                client.DontFragment = dontFragment;
+            }
+            catch (SocketException e)
+            {
+                Log.WarnFormat("Unable to set DontFragment", e);
+            }
+        }
+    }
+
+    /// <summary>
+    ///   Done to prevent exceptions in Socket.BeginReceive()
+    /// </summary>
+    /// <remarks>
+    ///   http://microsoft.public.win32.programmer.networks.narkive.com/RlxW2V6m/udp-comms-and-connection-reset-problem
+    /// </remarks>
+    private static void DisableConnReset(UdpClient client)
+    {
+        if (Environment.OSVersion.Platform == PlatformID.Win32NT)
+        {
+            const uint IOC_IN = 0x80000000;
+            const uint IOC_VENDOR = 0x18000000;
+            const uint SIO_UDP_CONNRESET = IOC_IN | IOC_VENDOR | 12;
+
+            client?.Client.IOControl(unchecked((int)SIO_UDP_CONNRESET),
+                new[] { System.Convert.ToByte(false) }, null);
+        }
+    }
+
+    protected void Close()
+    {
+        _exclusiveConn.Close();
+    }
+
+    public override void Start()
+    {
+        _disposing = false;
+
+        Open();
+
+        _sharedConn?.BeginReceive(OnReceiveData, _sharedConn);
+        _exclusiveConn?.BeginReceive(OnReceiveData, _exclusiveConn);
+    }
+
+    private void OnReceiveData(IAsyncResult asyncResult)
+    {
+        var connection = (UdpClient)asyncResult.AsyncState;
+
+        try
+        {
+            IPEndPoint ep = null;
+            byte[] receiveBuffer;
+
+            try
+            {
+                receiveBuffer = connection.EndReceive(asyncResult, ref ep);
+            }
+            finally
+            {
+                if (connection.Client != null && !_disposing)
+                {
+                    try
+                    {
+                        // BeginReceive ASAP to enable parallel processing (e.g. query additional data while processing a notification)
+                        connection.BeginReceive(OnReceiveData, connection);
+                    }
+                    catch (Exception ex)
+                    {
+                        Log.Error($"Failed to restart data receive. {ex}");
+                    }
+                }
+            }
+
+            var receiveBufferHex = ConvertToHex(receiveBuffer);
+            var receivedLength = receiveBuffer.Length;
+
+            if (receivedLength == 0) // Empty frame : port scanner maybe
+                return;
+
+            //verify message
+            Convert(ep, out var remoteAddress);
+
+            if (receivedLength < BVLC.BVLC_HEADER_LENGTH)
+            {
+                Log.Warn($"Some garbage data got in: {receiveBufferHex}");
+                return;
+            }
+
+            // Basic Header lenght
+            var headerLength = Bvlc.Decode(receiveBuffer, 0, out var function, out var _, ep);
+
+            if (headerLength == -1)
+            {
+                Log.Warn($"Unknow BVLC Header in: {receiveBufferHex}");
+                return;
+            }
+
+            switch (function)
+            {
+                case BacnetBvlcFunctions.BVLC_RESULT:
+                    // response to BVLC_REGISTER_FOREIGN_DEVICE, could be BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK
+                    // but we are not a BBMD, we don't care
+                    Log.Debug("Receive Register as Foreign Device Response");
+                    break;
+
+                case BacnetBvlcFunctions.BVLC_FORWARDED_NPDU:
+                    // BVLC_FORWARDED_NPDU frame by a BBMD, change the remote_address to the original one
+                    // stored in the BVLC header, we don't care about the BBMD address
+                    var ip = ((long)receiveBuffer[7] << 24) + ((long)receiveBuffer[6] << 16) +
+                             ((long)receiveBuffer[5] << 8) + receiveBuffer[4];
+
+                    var port = (receiveBuffer[8] << 8) + receiveBuffer[9]; // 0xbac0 maybe
+                    Convert(new IPEndPoint(ip, port), out remoteAddress);
+                    break;
+            }
+
+            if (function != BacnetBvlcFunctions.BVLC_ORIGINAL_UNICAST_NPDU &&
+                function != BacnetBvlcFunctions.BVLC_ORIGINAL_BROADCAST_NPDU &&
+                function != BacnetBvlcFunctions.BVLC_FORWARDED_NPDU)
+            {
+                Log.Debug($"{function} - ignoring");
+                return;
+            }
+
+            if (receivedLength <= headerLength)
+            {
+                Log.Warn($"Missing data, only header received: {receiveBufferHex}");
+                return;
+            }
+
+            InvokeMessageRecieved(receiveBuffer, headerLength, receivedLength - headerLength, remoteAddress);
+        }
+        catch (ObjectDisposedException)
+        {
+            Log.Debug("Connection has been disposed");
+        }
+        catch (Exception e)
+        {
+            if (connection.Client == null || _disposing)
+                return;
+
+            Log.Error("Exception in OnRecieveData", e);
+        }
+    }
+
+    public bool SendRegisterAsForeignDevice(IPEndPoint bbmd, short ttl)
+    {
+        if (bbmd.AddressFamily != AddressFamily.InterNetwork)
+            return false;
+
+        Bvlc.SendRegisterAsForeignDevice(bbmd, ttl);
+        return true;
+    }
+    public bool SendRemoteWhois(byte[] buffer, IPEndPoint bbmd, int msgLength)
+    {
+        if (bbmd.AddressFamily != AddressFamily.InterNetwork)
+            return false;
+
+        Bvlc.SendRemoteWhois(buffer, bbmd, msgLength);
+        return true;
+    }
+
+    public static string ConvertToHex(byte[] buffer)
+    {
+        return BitConverter.ToString(buffer).Replace("-", "");
+    }
+
+    public int Send(byte[] buffer, int dataLength, IPEndPoint ep)
+    {
+        // return _exclusiveConn.Send(buffer, data_length, ep);
+        ThreadPool.QueueUserWorkItem(o =>
+        {
+            try
+            {
+                _exclusiveConn.Send(buffer, dataLength, ep);
+            }
+            catch
+            {
+                    // not much you can do about at this point
+                }
+        }, null);
+
+        return dataLength;
+    }
+
+    public override int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address, bool waitForTransmission, int timeout)
+    {
+        if (_exclusiveConn == null) return 0;
+
+        //add header
+        var fullLength = dataLength + HeaderLength;
+        Bvlc.Encode(buffer, offset - BVLC.BVLC_HEADER_LENGTH, address.net == 0xFFFF
+            ? BacnetBvlcFunctions.BVLC_ORIGINAL_BROADCAST_NPDU
+            : BacnetBvlcFunctions.BVLC_ORIGINAL_UNICAST_NPDU, fullLength);
+
+        //create end point
+        Convert(address, out var ep);
+
+        try
+        {
+            // broadcasts are transported from our local unicast socket also
+            return _exclusiveConn.Send(buffer, fullLength, ep);
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    public static void Convert(IPEndPoint ep, out BacnetAddress address)
+    {
+        var tmp1 = ep.Address.GetAddressBytes();
+        var tmp2 = BitConverter.GetBytes((ushort)ep.Port);
+        Array.Reverse(tmp2);
+        Array.Resize(ref tmp1, tmp1.Length + tmp2.Length);
+        Array.Copy(tmp2, 0, tmp1, tmp1.Length - tmp2.Length, tmp2.Length);
+        address = new BacnetAddress(BacnetAddressTypes.IP, 0, tmp1);
+    }
+
+    public static void Convert(BacnetAddress address, out IPEndPoint ep)
+    {
+        long ipAddress = BitConverter.ToUInt32(address.adr, 0);
+        var port = (ushort)((address.adr[4] << 8) | (address.adr[5] << 0));
+        ep = new IPEndPoint(ipAddress, port);
+    }
+
+    // Get the IPAddress only if one is present
+    // this could be usefull to find the broadcast address even if the socket is open on the default interface
+    // removes somes virtual interfaces (certainly not all)
+    private static UnicastIPAddressInformation GetAddressDefaultInterface()
+    {
+        var unicastAddresses = NetworkInterface.GetAllNetworkInterfaces()
+            .Where(i => i.OperationalStatus == OperationalStatus.Up)
+            .Where(i => i.NetworkInterfaceType != NetworkInterfaceType.Loopback)
+            .Where(i => !(i.Name.Contains("VirtualBox") || i.Name.Contains("VMware")))
+            .SelectMany(i => i.GetIPProperties().UnicastAddresses)
+            .Where(a => a.Address.AddressFamily == AddressFamily.InterNetwork)
+            .ToArray();
+
+        return unicastAddresses.Length == 1
+            ? unicastAddresses.Single()
+            : null;
+    }
+
+    // A lot of problems on Mono (Raspberry) to get the correct broadcast @
+    // so this method is overridable (this allows the implementation of operating system specific code)
+    // Marc solution http://stackoverflow.com/questions/8119414/how-to-query-the-subnet-masks-using-mono-on-linux for instance
+    protected virtual BacnetAddress _GetBroadcastAddress()
+    {
+        // general broadcast by default if nothing better is found
+        var ep = new IPEndPoint(IPAddress.Parse("255.255.255.255"), SharedPort);
+
+        UnicastIPAddressInformation ipAddr = null;
+
+        if (LocalEndPoint.Address.ToString() == "0.0.0.0")
+        {
+            ipAddr = GetAddressDefaultInterface();
+        }
+        else
+        {
+            // restricted local broadcast (directed ... routable)
+            foreach (var adapter in NetworkInterface.GetAllNetworkInterfaces())
+                foreach (var ip in adapter.GetIPProperties().UnicastAddresses)
+                    if (LocalEndPoint.Address.Equals(ip.Address))
+                    {
+                        ipAddr = ip;
+                        break;
+                    }
+        }
+
+        if (ipAddr != null)
+        {
+            try
+            {
+                var strCurrentIP = ipAddr.Address.ToString().Split('.');
+                var strIPNetMask = ipAddr.IPv4Mask.ToString().Split('.');
+                var broadcastStr = new StringBuilder();
+                for (var i = 0; i < 4; i++)
+                {
+                    broadcastStr.Append(((byte)(int.Parse(strCurrentIP[i]) | ~int.Parse(strIPNetMask[i]))).ToString());
+                    if (i != 3) broadcastStr.Append('.');
+                }
+                ep = new IPEndPoint(IPAddress.Parse(broadcastStr.ToString()), SharedPort);
+            }
+            catch
+            {
+                // on mono IPv4Mask feature not implemented
+            }
+        }
+
+        Convert(ep, out var broadcast);
+        broadcast.net = 0xFFFF;
+        return broadcast;
+    }
+
+    public override BacnetAddress GetBroadcastAddress()
+    {
+        return _broadcastAddress ??= _GetBroadcastAddress();
+    }
+
+    public override void Dispose()
+    {
+        _disposing = true;
+        _exclusiveConn?.Close();
+        _exclusiveConn = null;
+        _sharedConn?.Close();
+        _sharedConn = null;
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpV6UdpProtocolTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpV6UdpProtocolTransport.cs
new file mode 100644
index 0000000..b03aca4
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetIpV6UdpProtocolTransport.cs
@@ -0,0 +1,362 @@
+/**************************************************************************
+*                           MIT License
+* 
+* Copyright (C) 2015 Frederic Chaxel <fchaxel@free.fr> 
+*                    Morten Kvistgaard <mk@pch-engineering.dk>
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+// based on Addendum 135-2012aj-4
+
+namespace System.IO.BACnet;
+
+public class BacnetIpV6UdpProtocolTransport : BacnetTransportBase
+{
+    private readonly bool _exclusivePort;
+    private readonly string _localEndpoint;
+    private readonly int _vMac;
+    private bool _dontFragment;
+    private UdpClient _exclusiveConn;
+    private UdpClient _sharedConn;
+
+    public BVLCV6 Bvlc { get; private set; }
+    public int SharedPort { get; }
+
+    // Give [::]:xxxx if the socket is open with System.Net.IPAddress.IPv6Any
+    // Used the bvlc layer class in BBMD mode
+    // Some more complex solutions could avoid this, that's why this property is virtual
+    public virtual IPEndPoint LocalEndPoint => (IPEndPoint)_exclusiveConn.Client.LocalEndPoint;
+
+    public BacnetIpV6UdpProtocolTransport(int port, int vMac = -1, bool useExclusivePort = false,
+        bool dontFragment = false, int maxPayload = 1472, string localEndpointIp = "")
+    {
+        SharedPort = port;
+        MaxBufferLength = maxPayload;
+        Type = BacnetAddressTypes.IPV6;
+        MaxAdpuLength = BVLCV6.BVLC_MAX_APDU;
+
+        // Two frames type, unicast with 10 bytes or broadcast with 7 bytes
+        // Here it's the biggest header, resize will be done after, if needed
+        HeaderLength = BVLCV6.BVLC_HEADER_LENGTH;
+
+        _exclusivePort = useExclusivePort;
+        _dontFragment = dontFragment;
+        _localEndpoint = localEndpointIp;
+        _vMac = vMac;
+    }
+
+    public override void Start()
+    {
+        Open();
+
+        _sharedConn?.BeginReceive(OnReceiveData, _sharedConn);
+        _exclusiveConn?.BeginReceive(OnReceiveData, _exclusiveConn);
+    }
+
+    public override int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address,
+        bool waitForTransmission, int timeout)
+    {
+        if (_exclusiveConn == null) return 0;
+
+        //add header
+        var fullLength = dataLength + HeaderLength;
+
+        if (address.net == 0xFFFF)
+        {
+            var newBuffer = new byte[fullLength - 3];
+            Array.Copy(buffer, 3, newBuffer, 0, fullLength - 3);
+            fullLength -= 3;
+            buffer = newBuffer;
+            Bvlc.Encode(buffer, offset - BVLCV6.BVLC_HEADER_LENGTH,
+                BacnetBvlcV6Functions.BVLC_ORIGINAL_BROADCAST_NPDU, fullLength, address);
+        }
+        else
+        {
+            Bvlc.Encode(buffer, offset - BVLCV6.BVLC_HEADER_LENGTH, BacnetBvlcV6Functions.BVLC_ORIGINAL_UNICAST_NPDU,
+                fullLength, address);
+        }
+
+        // create end point
+        Convert(address, out var ep);
+
+        try
+        {
+            // send
+            // multicast are transported from our local unicast socket also
+            return _exclusiveConn.Send(buffer, fullLength, ep);
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    public override BacnetAddress GetBroadcastAddress()
+    {
+        // could be FF08, FF05, FF04, FF02
+        var ep = new IPEndPoint(IPAddress.Parse("[FF0E::BAC0]"), SharedPort);
+        Convert(ep, out var ret);
+        ret.net = 0xFFFF;
+        return ret;
+    }
+
+    public override void Dispose()
+    {
+        _exclusiveConn?.Close();
+        _exclusiveConn = null;
+        _sharedConn?.Close();
+        _sharedConn = null;
+    }
+
+    public override bool Equals(object obj)
+    {
+        var a = obj as BacnetIpV6UdpProtocolTransport;
+        return a?.SharedPort == SharedPort;
+    }
+
+    public override int GetHashCode()
+    {
+        return SharedPort.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return "Udp IPv6:" + SharedPort;
+    }
+
+    private void Open()
+    {
+        UdpClient multicastListener = null;
+
+        if (!_exclusivePort)
+        {
+            /* We need a shared multicast "listen" port. This is the 0xBAC0 port */
+            /* This will enable us to have more than 1 client, on the same machine. Perhaps it's not that important though. */
+            /* We (might) only receive the multicast on this. Any unicasts to this might be eaten by another local client */
+            if (_sharedConn == null)
+            {
+                _sharedConn = new UdpClient(AddressFamily.InterNetworkV6) { ExclusiveAddressUse = false };
+                _sharedConn.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
+                EndPoint ep = new IPEndPoint(IPAddress.IPv6Any, SharedPort);
+                if (!string.IsNullOrEmpty(_localEndpoint))
+                    ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), SharedPort);
+                _sharedConn.Client.Bind(ep);
+                multicastListener = _sharedConn;
+            }
+            /* This is our own exclusive port. We'll recieve everything sent to this. */
+            /* So this is how we'll present our selves to the world */
+            if (_exclusiveConn == null)
+            {
+                EndPoint ep = new IPEndPoint(IPAddress.IPv6Any, 0);
+                if (!string.IsNullOrEmpty(_localEndpoint)) ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), 0);
+                _exclusiveConn = new UdpClient((IPEndPoint)ep);
+            }
+        }
+        else
+        {
+            EndPoint ep = new IPEndPoint(IPAddress.IPv6Any, SharedPort);
+            if (!string.IsNullOrEmpty(_localEndpoint))
+                ep = new IPEndPoint(IPAddress.Parse(_localEndpoint), SharedPort);
+            _exclusiveConn = new UdpClient(AddressFamily.InterNetworkV6)
+            {
+                ExclusiveAddressUse = true
+            };
+            _exclusiveConn.Client.Bind((IPEndPoint)ep);
+            multicastListener = _exclusiveConn;
+        }
+
+        multicastListener.JoinMulticastGroup(IPAddress.Parse("[FF02::BAC0]"));
+        multicastListener.JoinMulticastGroup(IPAddress.Parse("[FF04::BAC0]"));
+        multicastListener.JoinMulticastGroup(IPAddress.Parse("[FF05::BAC0]"));
+        multicastListener.JoinMulticastGroup(IPAddress.Parse("[FF08::BAC0]"));
+        multicastListener.JoinMulticastGroup(IPAddress.Parse("[FF0E::BAC0]"));
+
+        // If this option is enabled Yabe cannot see itself !
+        // multicastListener.MulticastLoopback = false;
+
+        Bvlc = new BVLCV6(this, _vMac);
+    }
+
+    protected void Close()
+    {
+        _sharedConn?.BeginReceive(OnReceiveData, _sharedConn);
+        _exclusiveConn?.BeginReceive(OnReceiveData, _exclusiveConn);
+    }
+
+    private void OnReceiveData(IAsyncResult asyncResult)
+    {
+        var conn = (UdpClient)asyncResult.AsyncState;
+        try
+        {
+            var ep = new IPEndPoint(IPAddress.Any, 0);
+            byte[] localBuffer;
+            int rx;
+
+            try
+            {
+                localBuffer = conn.EndReceive(asyncResult, ref ep);
+                rx = localBuffer.Length;
+            }
+            catch (Exception) // ICMP port unreachable
+            {
+                //restart data receive
+                conn.BeginReceive(OnReceiveData, conn);
+                return;
+            }
+
+            if (rx == 0) // Empty frame : port scanner maybe
+            {
+                //restart data receive
+                conn.BeginReceive(OnReceiveData, conn);
+                return;
+            }
+
+            try
+            {
+                //verify message
+                Convert(ep, out var remoteAddress);
+                if (rx < BVLCV6.BVLC_HEADER_LENGTH - 3)
+                {
+                    Log.Warn("Some garbage data got in");
+                }
+                else
+                {
+                    // Basic Header lenght
+                    var headerLength = Bvlc.Decode(localBuffer, 0, out var function, out _, ep, remoteAddress);
+
+                    switch (headerLength)
+                    {
+                        case 0:
+                            return;
+                        case -1:
+                            Log.Debug("Unknow BVLC Header");
+                            return;
+                    }
+
+                    // response to BVLC_REGISTER_FOREIGN_DEVICE (could be BVLC_DISTRIBUTE_BROADCAST_TO_NETWORK ... but we are not a BBMD, don't care)
+                    if (function == BacnetBvlcV6Functions.BVLC_RESULT)
+                    {
+                        Log.Debug("Receive Register as Foreign Device Response");
+                    }
+
+                    // a BVLC_FORWARDED_NPDU frame by a BBMD, change the remote_address to the original one (stored in the BVLC header) 
+                    // we don't care about the BBMD address
+                    if (function == BacnetBvlcV6Functions.BVLC_FORWARDED_NPDU)
+                    {
+                        Array.Copy(localBuffer, 7, remoteAddress.adr, 0, 18);
+                    }
+
+                    if (function != BacnetBvlcV6Functions.BVLC_ORIGINAL_UNICAST_NPDU &&
+                        function != BacnetBvlcV6Functions.BVLC_ORIGINAL_BROADCAST_NPDU &&
+                        function != BacnetBvlcV6Functions.BVLC_FORWARDED_NPDU)
+                        return;
+
+                    if (rx > headerLength)
+                        InvokeMessageRecieved(localBuffer, headerLength, rx - headerLength, remoteAddress);
+                }
+            }
+            catch (Exception ex)
+            {
+                Log.Error("Exception in udp recieve", ex);
+            }
+            finally
+            {
+                //restart data receive
+                conn.BeginReceive(OnReceiveData, conn);
+            }
+        }
+        catch (Exception ex)
+        {
+            //restart data receive
+            if (conn.Client != null)
+            {
+                Log.Error("Exception in Ip OnRecieveData", ex);
+                conn.BeginReceive(OnReceiveData, conn);
+            }
+        }
+    }
+
+    public static string ConvertToHex(byte[] buffer, int length)
+    {
+        var ret = "";
+
+        for (var i = 0; i < length; i++)
+            ret += buffer[i].ToString("X2");
+
+        return ret;
+    }
+
+    // Modif FC : used for BBMD communication
+    public int Send(byte[] buffer, int dataLength, IPEndPoint ep)
+    {
+        try
+        {
+            // return _exclusiveConn.Send(buffer, data_length, ep);
+            ThreadPool.QueueUserWorkItem(o => _exclusiveConn.Send(buffer, dataLength, ep), null);
+            return dataLength;
+        }
+        catch
+        {
+            return 0;
+        }
+    }
+
+    public bool SendRegisterAsForeignDevice(IPEndPoint bbmd, short ttl)
+    {
+        if (bbmd.AddressFamily != AddressFamily.InterNetworkV6)
+            return false;
+
+        Bvlc.SendRegisterAsForeignDevice(bbmd, ttl);
+        return true;
+    }
+
+    public bool SendRemoteWhois(byte[] buffer, IPEndPoint bbmd, int msgLength)
+    {
+        if (bbmd.AddressFamily != AddressFamily.InterNetworkV6)
+            return false;
+
+        // This message was build using the default (10) header lenght, but it's smaller (7)
+        var newBuffer = new byte[msgLength - 3];
+        Array.Copy(buffer, 3, newBuffer, 0, msgLength - 3);
+        msgLength -= 3;
+
+        Bvlc.SendRemoteWhois(newBuffer, bbmd, msgLength);
+        return true;
+    }
+
+    public static void Convert(IPEndPoint ep, out BacnetAddress address)
+    {
+        var tmp1 = ep.Address.GetAddressBytes();
+        var tmp2 = BitConverter.GetBytes((ushort)ep.Port);
+        Array.Reverse(tmp2);
+        Array.Resize(ref tmp1, tmp1.Length + tmp2.Length);
+        Array.Copy(tmp2, 0, tmp1, tmp1.Length - tmp2.Length, tmp2.Length);
+        address = new BacnetAddress(BacnetAddressTypes.IPV6, 0, tmp1);
+    }
+
+    public static void Convert(BacnetAddress address, out IPEndPoint ep)
+    {
+        var port = (ushort)((address.adr[16] << 8) | (address.adr[17] << 0));
+        var ipv6 = new byte[16];
+        Array.Copy(address.adr, ipv6, 16);
+        ep = new IPEndPoint(new IPAddress(ipv6), port);
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetMstpProtocolTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetMstpProtocolTransport.cs
new file mode 100644
index 0000000..94ca7b7
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetMstpProtocolTransport.cs
@@ -0,0 +1,917 @@
+namespace System.IO.BACnet;
+
+/// <summary>
+/// This is the standard BACNet MSTP transport
+/// </summary>
+public class BacnetMstpProtocolTransport : BacnetTransportBase
+{
+    public delegate void FrameRecievedHandler(BacnetMstpProtocolTransport sender, BacnetMstpFrameTypes frameType,
+        byte destinationAddress, byte sourceAddress, int msgLength);
+
+    public enum GetMessageStatus
+    {
+        Good,
+        Timeout,
+        SubTimeout,
+        ConnectionClose,
+        ConnectionError,
+        DecodeError
+    }
+
+    /// <summary>
+    /// The minimum time (ms) without a DataAvailable or ReceiveError event within a frame before a receiving node may discard the frame.
+    /// </summary>
+    public const int T_FRAME_ABORT = 80;
+
+    /// <summary>
+    /// The time (ms) without a DataAvailable or ReceiveError event before declaration of loss of token
+    /// </summary>
+    public const int T_NO_TOKEN = 500;
+
+    /// <summary>
+    /// The minimum time (ms) without a DataAvailable or ReceiveError event that a node must wait for a station to begin replying to a confirmed request
+    /// </summary>
+    public const int T_REPLY_TIMEOUT = 295;
+
+    /// <summary>
+    /// The minimum time (ms) without a DataAvailable or ReceiveError event that a node must wait for a remote node to begin using a token or replying to a Poll For Master frame:
+    /// </summary>
+    public const int T_USAGE_TIMEOUT = 95;
+
+    /// <summary>
+    /// The maximum time (ms) a node may wait after reception of a frame that expects a reply before sending the first octet of a reply or Reply Postponed frame
+    /// </summary>
+    public const int T_REPLY_DELAY = 250;
+
+    public const int ETIMEDOUT = 110;
+
+    private IBacnetSerialTransport _port;
+    private byte _frameCount;
+    private readonly byte[] _localBuffer;
+    private int _localOffset;
+
+    /// <summary>
+    /// The number of tokens received or used before a Poll For Master cycle is executed
+    /// </summary>
+    private const byte MaxPoll = 50;
+
+    /// <summary>
+    /// "Next Station," the MAC address of the node to which This Station passes the token. If the Next Station is unknown, NS shall be equal to TS
+    /// </summary>
+    private byte _ns;
+
+    /// <summary>
+    /// "Poll Station," the MAC address of the node to which This Station last sent a Poll For Master. This is used during token maintenance
+    /// </summary>
+    private byte _ps;
+
+    private MessageFrame _reply;
+    private readonly ManualResetEvent _replyMutex = new(false);
+    private byte _replySource;
+    private const byte RetryToken = 1;
+    private readonly LinkedList<MessageFrame> _sendQueue = new();
+    private bool _soleMaster;
+    private byte _tokenCount;
+    private Thread _transmitThread;
+
+    public short SourceAddress { get; set; }
+    public byte MaxMaster { get; set; }
+    public bool IsRunning { get; private set; } = true;
+
+    public BacnetMstpProtocolTransport(IBacnetSerialTransport transport, short sourceAddress = -1,
+        byte maxMaster = 127, byte maxInfoFrames = 1)
+    {
+        SourceAddress = sourceAddress;
+        MaxMaster = maxMaster;
+        Type = BacnetAddressTypes.MSTP;
+        HeaderLength = MSTP.MSTP_HEADER_LENGTH;
+        MaxBufferLength = 502;
+        MaxAdpuLength = MSTP.MSTP_MAX_APDU;
+        MaxInfoFrames = maxInfoFrames;
+
+        _localBuffer = new byte[MaxBufferLength];
+        _port = transport;
+    }
+
+    public BacnetMstpProtocolTransport(string portName, int baudRate, short sourceAddress = -1,
+        byte maxMaster = 127, byte maxInfoFrames = 1)
+        : this(new BacnetSerialPortTransport(portName, baudRate), sourceAddress, maxMaster, maxInfoFrames)
+    {
+    }
+
+    public override void Start()
+    {
+        if (_port == null) return;
+        _port.Open();
+
+        _transmitThread = new Thread(MstpThread)
+        {
+            IsBackground = true,
+            Name = "MSTP Thread",
+            Priority = ThreadPriority.Highest
+        };
+        _transmitThread.Start();
+    }
+
+    public override int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address,
+        bool waitForTransmission, int timeout)
+    {
+        if (SourceAddress == -1) throw new Exception("Source address must be set up before sending messages");
+
+        //add to queue
+        var function = NPDU.DecodeFunction(buffer, offset);
+        var frameType = (function & BacnetNpduControls.ExpectingReply) == BacnetNpduControls.ExpectingReply
+            ? BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY
+            : BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
+        var copy = new byte[dataLength + MSTP.MSTP_HEADER_LENGTH + 2];
+        Array.Copy(buffer, offset, copy, MSTP.MSTP_HEADER_LENGTH, dataLength);
+        var f = new MessageFrame(frameType, address.adr[0], copy, dataLength);
+        lock (_sendQueue)
+            _sendQueue.AddLast(f);
+        if (_reply == null)
+        {
+            _reply = f;
+            _replyMutex.Set();
+        }
+
+        if (!waitForTransmission)
+            return dataLength;
+
+        //wait for message to be sent
+        if (!f.SendMutex.WaitOne(timeout))
+            return -ETIMEDOUT;
+
+        return dataLength;
+    }
+
+    public override bool WaitForAllTransmits(int timeout)
+    {
+        while (_sendQueue.Count > 0)
+        {
+            ManualResetEvent ev;
+            lock (_sendQueue)
+                ev = _sendQueue.First.Value.SendMutex;
+
+            if (ev.WaitOne(timeout))
+                return false;
+        }
+        return true;
+    }
+
+    public override BacnetAddress GetBroadcastAddress()
+    {
+        return new BacnetAddress(BacnetAddressTypes.MSTP, 0xFFFF, new byte[] { 0xFF });
+    }
+
+    public override void Dispose()
+    {
+        _port?.Close();
+        _port = null;
+    }
+
+    public event FrameRecievedHandler FrameRecieved;
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not BacnetMstpProtocolTransport) return false;
+        var a = (BacnetMstpProtocolTransport)obj;
+        return _port.Equals(a._port);
+    }
+
+    public override int GetHashCode()
+    {
+        return _port.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return _port.ToString();
+    }
+
+    private void QueueFrame(BacnetMstpFrameTypes frameType, byte destinationAddress)
+    {
+        lock (_sendQueue)
+            _sendQueue.AddLast(new MessageFrame(frameType, destinationAddress, null, 0));
+    }
+
+    private void SendFrame(BacnetMstpFrameTypes frameType, byte destinationAddress)
+    {
+        SendFrame(new MessageFrame(frameType, destinationAddress, null, 0));
+    }
+
+    private void SendFrame(MessageFrame frame)
+    {
+        if (SourceAddress == -1 || _port == null) return;
+        int tx;
+        if (frame.Data == null || frame.Data.Length == 0)
+        {
+            var tmpTransmitBuffer = new byte[MSTP.MSTP_HEADER_LENGTH];
+            tx = MSTP.Encode(tmpTransmitBuffer, 0, frame.FrameType, frame.DestinationAddress,
+                (byte)SourceAddress, 0);
+            _port.Write(tmpTransmitBuffer, 0, tx);
+        }
+        else
+        {
+            tx = MSTP.Encode(frame.Data, 0, frame.FrameType, frame.DestinationAddress, (byte)SourceAddress,
+                frame.DataLength);
+            _port.Write(frame.Data, 0, tx);
+        }
+        frame.SendMutex.Set();
+        Log.Debug($"{frame.FrameType} {frame.DestinationAddress:X2}");
+    }
+
+    private void RemoveCurrentMessage(int msgLength)
+    {
+        var fullMsgLength = MSTP.MSTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
+        if (_localOffset > fullMsgLength)
+            Array.Copy(_localBuffer, fullMsgLength, _localBuffer, 0, _localOffset - fullMsgLength);
+        _localOffset -= fullMsgLength;
+    }
+
+    private StateChanges PollForMaster()
+    {
+        while (true)
+        {
+            //send
+            SendFrame(BacnetMstpFrameTypes.FRAME_TYPE_POLL_FOR_MASTER, _ps);
+
+            //wait
+            var status = GetNextMessage(T_USAGE_TIMEOUT, out var frameType, out var destinationAddress,
+                out var sourceAddress, out var msgLength);
+
+            if (status == GetMessageStatus.Good)
+            {
+                try
+                {
+                    if (frameType == BacnetMstpFrameTypes.FRAME_TYPE_REPLY_TO_POLL_FOR_MASTER &&
+                        destinationAddress == SourceAddress)
+                    {
+                        _soleMaster = false;
+                        _ns = sourceAddress;
+                        _ps = (byte)SourceAddress;
+                        _tokenCount = 0;
+                        return StateChanges.ReceivedReplyToPFM;
+                    }
+                    else
+                        return StateChanges.ReceivedUnexpectedFrame;
+                }
+                finally
+                {
+                    RemoveCurrentMessage(msgLength);
+                }
+            }
+            if (_soleMaster)
+            {
+                /* SoleMaster */
+                _frameCount = 0;
+                return StateChanges.SoleMaster;
+            }
+            if (_ns != SourceAddress)
+            {
+                /* DoneWithPFM */
+                return StateChanges.DoneWithPFM;
+            }
+            if ((_ps + 1) % (MaxMaster + 1) != SourceAddress)
+            {
+                /* SendNextPFM */
+                _ps = (byte)((_ps + 1) % (MaxMaster + 1));
+            }
+            else
+            {
+                /* DeclareSoleMaster */
+                _soleMaster = true;
+                _frameCount = 0;
+                return StateChanges.DeclareSoleMaster;
+            }
+        }
+    }
+
+    private StateChanges DoneWithToken()
+    {
+        if (_frameCount < MaxInfoFrames)
+        {
+            /* SendAnotherFrame */
+            return StateChanges.SendAnotherFrame;
+        }
+        if (!_soleMaster && _ns == SourceAddress)
+        {
+            /* NextStationUnknown */
+            _ps = (byte)((SourceAddress + 1) % (MaxMaster + 1));
+            return StateChanges.NextStationUnknown;
+        }
+        if (_tokenCount < MaxPoll - 1)
+        {
+            _tokenCount++;
+            if (_soleMaster && _ns != (SourceAddress + 1) % (MaxMaster + 1))
+            {
+                /* SoleMaster */
+                _frameCount = 0;
+                return StateChanges.SoleMaster;
+            }
+            /* SendToken */
+            return StateChanges.SendToken;
+        }
+        if ((_ps + 1) % (MaxMaster + 1) == _ns)
+        {
+            if (!_soleMaster)
+            {
+                /* ResetMaintenancePFM */
+                _ps = (byte)SourceAddress;
+                _tokenCount = 1;
+                return StateChanges.ResetMaintenancePFM;
+            }
+            /* SoleMasterRestartMaintenancePFM */
+            _ps = (byte)((_ns + 1) % (MaxMaster + 1));
+            _ns = (byte)SourceAddress;
+            _tokenCount = 1;
+            return StateChanges.SoleMasterRestartMaintenancePFM;
+        }
+        /* SendMaintenancePFM */
+        _ps = (byte)((_ps + 1) % (MaxMaster + 1));
+        return StateChanges.SendMaintenancePFM;
+    }
+
+    private StateChanges WaitForReply()
+    {
+        //fetch message
+        var status = GetNextMessage(T_REPLY_TIMEOUT, out var frameType, out var destinationAddress,
+            out var sourceAddress, out var msgLength);
+
+        if (status == GetMessageStatus.Good)
+        {
+            try
+            {
+                if (destinationAddress == (byte)SourceAddress &&
+                    (frameType == BacnetMstpFrameTypes.FRAME_TYPE_TEST_RESPONSE ||
+                     frameType == BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY))
+                {
+                    //signal upper layer
+                    if (frameType != BacnetMstpFrameTypes.FRAME_TYPE_TEST_RESPONSE)
+                    {
+                        var remoteAddress = new BacnetAddress(BacnetAddressTypes.MSTP, 0, new[] { sourceAddress });
+                        try
+                        {
+                            InvokeMessageRecieved(_localBuffer, MSTP.MSTP_HEADER_LENGTH, msgLength, remoteAddress);
+                        }
+                        catch (Exception ex)
+                        {
+                            Log.Error("Exception in MessageRecieved event", ex);
+                        }
+                    }
+
+                    /* ReceivedReply */
+                    return StateChanges.ReceivedReply;
+                }
+                else if (frameType == BacnetMstpFrameTypes.FRAME_TYPE_REPLY_POSTPONED)
+                {
+                    /* ReceivedPostpone */
+                    return StateChanges.ReceivedPostpone;
+                }
+                else
+                {
+                    /* ReceivedUnexpectedFrame */
+                    return StateChanges.ReceivedUnexpectedFrame;
+                }
+            }
+            finally
+            {
+                RemoveCurrentMessage(msgLength);
+            }
+        }
+
+        if (status != GetMessageStatus.Timeout)
+            return StateChanges.InvalidFrame;
+
+        /* ReplyTimeout */
+        _frameCount = MaxInfoFrames;
+        return StateChanges.ReplyTimeOut;
+        /* InvalidFrame */
+    }
+
+    private StateChanges UseToken()
+    {
+        if (_sendQueue.Count == 0)
+        {
+            /* NothingToSend */
+            _frameCount = MaxInfoFrames;
+            return StateChanges.NothingToSend;
+        }
+        /* SendNoWait / SendAndWait */
+        MessageFrame messageFrame;
+        lock (_sendQueue)
+        {
+            messageFrame = _sendQueue.First.Value;
+            _sendQueue.RemoveFirst();
+        }
+        SendFrame(messageFrame);
+        _frameCount++;
+        if (messageFrame.FrameType == BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY ||
+            messageFrame.FrameType == BacnetMstpFrameTypes.FRAME_TYPE_TEST_REQUEST)
+            return StateChanges.SendAndWait;
+        return StateChanges.SendNoWait;
+    }
+
+    private StateChanges PassToken()
+    {
+        for (var i = 0; i <= RetryToken; i++)
+        {
+            //send 
+            SendFrame(BacnetMstpFrameTypes.FRAME_TYPE_TOKEN, _ns);
+
+            //wait for it to be used
+            var status = GetNextMessage(T_USAGE_TIMEOUT, out _, out _, out _, out _);
+            if (status == GetMessageStatus.Good || status == GetMessageStatus.DecodeError)
+                return StateChanges.SawTokenUser; //don't remove current message
+        }
+
+        //give up
+        _ps = (byte)((_ns + 1) % (MaxMaster + 1));
+        _ns = (byte)SourceAddress;
+        _tokenCount = 0;
+        return StateChanges.FindNewSuccessor;
+    }
+
+    private StateChanges Idle()
+    {
+        var noTokenTimeout = T_NO_TOKEN + 10 * SourceAddress;
+
+        while (_port != null)
+        {
+            //get message
+            var status = GetNextMessage(noTokenTimeout, out var frameType, out var destinationAddress,
+                out var sourceAddress, out var msgLength);
+
+            if (status == GetMessageStatus.Good)
+            {
+                try
+                {
+                    if (destinationAddress == SourceAddress || destinationAddress == 0xFF)
+                    {
+                        switch (frameType)
+                        {
+                            case BacnetMstpFrameTypes.FRAME_TYPE_POLL_FOR_MASTER:
+                                if (destinationAddress == 0xFF)
+                                    QueueFrame(BacnetMstpFrameTypes.FRAME_TYPE_REPLY_TO_POLL_FOR_MASTER,
+                                        sourceAddress);
+                                else
+                                {
+                                    //respond to PFM
+                                    SendFrame(BacnetMstpFrameTypes.FRAME_TYPE_REPLY_TO_POLL_FOR_MASTER,
+                                        sourceAddress);
+                                }
+                                break;
+                            case BacnetMstpFrameTypes.FRAME_TYPE_TOKEN:
+                                if (destinationAddress != 0xFF)
+                                {
+                                    _frameCount = 0;
+                                    _soleMaster = false;
+                                    return StateChanges.ReceivedToken;
+                                }
+                                break;
+                            case BacnetMstpFrameTypes.FRAME_TYPE_TEST_REQUEST:
+                                if (destinationAddress == 0xFF)
+                                    QueueFrame(BacnetMstpFrameTypes.FRAME_TYPE_TEST_RESPONSE, sourceAddress);
+                                else
+                                {
+                                    //respond to test
+                                    SendFrame(BacnetMstpFrameTypes.FRAME_TYPE_TEST_RESPONSE, sourceAddress);
+                                }
+                                break;
+                            case BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY:
+                            case BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY:
+                                try
+                                {
+                                    //signal upper layer
+                                    var remoteAddress = new BacnetAddress(BacnetAddressTypes.MSTP, 0, new[] { sourceAddress });
+                                    InvokeMessageRecieved(_localBuffer, MSTP.MSTP_HEADER_LENGTH, msgLength, remoteAddress);
+                                }
+                                catch (Exception ex)
+                                {
+                                    Log.Error("Exception in MessageRecieved event", ex);
+                                }
+                                if (frameType == BacnetMstpFrameTypes.FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY)
+                                {
+                                    _replySource = sourceAddress;
+                                    _reply = null;
+                                    _replyMutex.Reset();
+                                    return StateChanges.ReceivedDataNeedingReply;
+                                }
+                                break;
+                        }
+                    }
+                }
+                finally
+                {
+                    RemoveCurrentMessage(msgLength);
+                }
+            }
+            else if (status == GetMessageStatus.Timeout)
+            {
+                /* GenerateToken */
+                _ps = (byte)((SourceAddress + 1) % (MaxMaster + 1));
+                _ns = (byte)SourceAddress;
+                _tokenCount = 0;
+                return StateChanges.GenerateToken;
+            }
+            else if (status == GetMessageStatus.ConnectionClose)
+            {
+                Log.Debug("No connection");
+            }
+            else if (status == GetMessageStatus.ConnectionError)
+            {
+                Log.Debug("Connection Error");
+            }
+            else
+            {
+                Log.Debug("Garbage");
+            }
+        }
+
+        return StateChanges.Reset;
+    }
+
+    private StateChanges AnswerDataRequest()
+    {
+        if (_replyMutex.WaitOne(T_REPLY_DELAY))
+        {
+            SendFrame(_reply);
+            lock (_sendQueue)
+                _sendQueue.Remove(_reply);
+            return StateChanges.Reply;
+        }
+        SendFrame(BacnetMstpFrameTypes.FRAME_TYPE_REPLY_POSTPONED, _replySource);
+        return StateChanges.DeferredReply;
+    }
+
+    private StateChanges Initialize()
+    {
+        _tokenCount = MaxPoll; /* cause a Poll For Master to be sent when this node first receives the token */
+        _frameCount = 0;
+        _soleMaster = false;
+        _ns = (byte)SourceAddress;
+        _ps = (byte)SourceAddress;
+        return StateChanges.DoneInitializing;
+    }
+
+    private void MstpThread()
+    {
+        try
+        {
+            var stateChange = StateChanges.Reset;
+
+            while (_port != null)
+            {
+                Log.Debug(stateChange);
+
+                switch (stateChange)
+                {
+                    case StateChanges.Reset:
+                        stateChange = Initialize();
+                        break;
+                    case StateChanges.DoneInitializing:
+                    case StateChanges.ReceivedUnexpectedFrame:
+                    case StateChanges.Reply:
+                    case StateChanges.DeferredReply:
+                    case StateChanges.SawTokenUser:
+                        stateChange = Idle();
+                        break;
+                    case StateChanges.GenerateToken:
+                    case StateChanges.FindNewSuccessor:
+                    case StateChanges.SendMaintenancePFM:
+                    case StateChanges.SoleMasterRestartMaintenancePFM:
+                    case StateChanges.NextStationUnknown:
+                        stateChange = PollForMaster();
+                        break;
+                    case StateChanges.DoneWithPFM:
+                    case StateChanges.ResetMaintenancePFM:
+                    case StateChanges.ReceivedReplyToPFM:
+                    case StateChanges.SendToken:
+                        stateChange = PassToken();
+                        break;
+                    case StateChanges.ReceivedDataNeedingReply:
+                        stateChange = AnswerDataRequest();
+                        break;
+                    case StateChanges.ReceivedToken:
+                    case StateChanges.SoleMaster:
+                    case StateChanges.DeclareSoleMaster:
+                    case StateChanges.SendAnotherFrame:
+                        stateChange = UseToken();
+                        break;
+                    case StateChanges.NothingToSend:
+                    case StateChanges.SendNoWait:
+                    case StateChanges.ReplyTimeOut:
+                    case StateChanges.InvalidFrame:
+                    case StateChanges.ReceivedReply:
+                    case StateChanges.ReceivedPostpone:
+                        stateChange = DoneWithToken();
+                        break;
+                    case StateChanges.SendAndWait:
+                        stateChange = WaitForReply();
+                        break;
+                }
+            }
+            Log.Debug("MSTP thread is closing down");
+        }
+        catch (Exception ex)
+        {
+            Log.Error("Exception in MSTP thread", ex);
+        }
+
+        IsRunning = false;
+    }
+
+    private void RemoveGarbage()
+    {
+        //scan for preambles
+        for (var i = 0; i < _localOffset - 1; i++)
+        {
+            if (_localBuffer[i] != MSTP.MSTP_PREAMBLE1 || _localBuffer[i + 1] != MSTP.MSTP_PREAMBLE2)
+                continue;
+
+            if (i <= 0)
+                return;
+
+            //move back
+            Array.Copy(_localBuffer, i, _localBuffer, 0, _localOffset - i);
+            _localOffset -= i;
+            Log.Debug("Garbage");
+            return;
+        }
+
+        //one preamble?
+        if (_localOffset > 0 && _localBuffer[_localOffset - 1] == MSTP.MSTP_PREAMBLE1)
+        {
+            if (_localOffset != 1)
+            {
+                _localBuffer[0] = MSTP.MSTP_PREAMBLE1;
+                _localOffset = 1;
+                Log.Debug("Garbage");
+            }
+            return;
+        }
+
+        //no preamble?
+        if (_localOffset > 0)
+        {
+            _localOffset = 0;
+            Log.Debug("Garbage");
+        }
+    }
+
+    private GetMessageStatus GetNextMessage(int timeoutMs, out BacnetMstpFrameTypes frameType,
+        out byte destinationAddress, out byte sourceAddress, out int msgLength)
+    {
+        int timeout;
+
+        frameType = BacnetMstpFrameTypes.FRAME_TYPE_TOKEN;
+        destinationAddress = 0;
+        sourceAddress = 0;
+        msgLength = 0;
+
+        //fetch header
+        while (_localOffset < MSTP.MSTP_HEADER_LENGTH)
+        {
+            if (_port == null) return GetMessageStatus.ConnectionClose;
+
+            timeout = _localOffset > 0
+                ? T_FRAME_ABORT // set sub timeout
+                : timeoutMs; // set big silence timeout
+
+            //read 
+            var rx = _port.Read(_localBuffer, _localOffset, MSTP.MSTP_HEADER_LENGTH - _localOffset, timeout);
+            if (rx == -ETIMEDOUT)
+            {
+                //drop message
+                var status = _localOffset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
+                _localBuffer[0] = 0xFF;
+                RemoveGarbage();
+                return status;
+            }
+            if (rx < 0)
+            {
+                //drop message
+                _localBuffer[0] = 0xFF;
+                RemoveGarbage();
+                return GetMessageStatus.ConnectionError;
+            }
+            if (rx == 0)
+            {
+                //drop message
+                _localBuffer[0] = 0xFF;
+                RemoveGarbage();
+                return GetMessageStatus.ConnectionClose;
+            }
+            _localOffset += rx;
+
+            //remove paddings & garbage
+            RemoveGarbage();
+        }
+
+        //decode
+        if (MSTP.Decode(_localBuffer, 0, _localOffset, out frameType, out destinationAddress,
+                out sourceAddress, out msgLength) < 0)
+        {
+            //drop message
+            _localBuffer[0] = 0xFF;
+            RemoveGarbage();
+            return GetMessageStatus.DecodeError;
+        }
+
+        //valid length?
+        var fullMsgLength = msgLength + MSTP.MSTP_HEADER_LENGTH + (msgLength > 0 ? 2 : 0);
+        if (msgLength > MaxBufferLength)
+        {
+            //drop message
+            _localBuffer[0] = 0xFF;
+            RemoveGarbage();
+            return GetMessageStatus.DecodeError;
+        }
+
+        //fetch data
+        if (msgLength > 0)
+        {
+            timeout = T_FRAME_ABORT; //set sub timeout
+            while (_localOffset < fullMsgLength)
+            {
+                //read 
+                var rx = _port.Read(_localBuffer, _localOffset, fullMsgLength - _localOffset, timeout);
+                if (rx == -ETIMEDOUT)
+                {
+                    //drop message
+                    var status = _localOffset == 0 ? GetMessageStatus.Timeout : GetMessageStatus.SubTimeout;
+                    _localBuffer[0] = 0xFF;
+                    RemoveGarbage();
+                    return status;
+                }
+                if (rx < 0)
+                {
+                    //drop message
+                    _localBuffer[0] = 0xFF;
+                    RemoveGarbage();
+                    return GetMessageStatus.ConnectionError;
+                }
+                if (rx == 0)
+                {
+                    //drop message
+                    _localBuffer[0] = 0xFF;
+                    RemoveGarbage();
+                    return GetMessageStatus.ConnectionClose;
+                }
+                _localOffset += rx;
+            }
+
+            //verify data crc
+            if (
+                MSTP.Decode(_localBuffer, 0, _localOffset, out frameType, out destinationAddress,
+                    out sourceAddress, out msgLength) < 0)
+            {
+                //drop message
+                _localBuffer[0] = 0xFF;
+                RemoveGarbage();
+                return GetMessageStatus.DecodeError;
+            }
+        }
+
+        //signal frame event
+        if (FrameRecieved != null)
+        {
+            var frameTypeCopy = frameType;
+            var destinationAddressCopy = destinationAddress;
+            var sourceAddressCopy = sourceAddress;
+            var msgLengthCopy = msgLength;
+
+            ThreadPool.QueueUserWorkItem(
+                o => { FrameRecieved(this, frameTypeCopy, destinationAddressCopy, sourceAddressCopy, msgLengthCopy); }, null);
+        }
+
+        Log.Debug($"{frameType} {destinationAddress:X2}");
+
+        //done
+        return GetMessageStatus.Good;
+    }
+
+    private class MessageFrame
+    {
+        public readonly byte[] Data;
+        public readonly int DataLength;
+        public readonly byte DestinationAddress;
+        public readonly BacnetMstpFrameTypes FrameType;
+        public readonly ManualResetEvent SendMutex;
+
+        public MessageFrame(BacnetMstpFrameTypes frameType, byte destinationAddress, byte[] data, int dataLength)
+        {
+            FrameType = frameType;
+            DestinationAddress = destinationAddress;
+            Data = data;
+            DataLength = dataLength;
+            SendMutex = new ManualResetEvent(false);
+        }
+    }
+
+    private enum StateChanges
+    {
+        /* Initializing */
+        Reset,
+        DoneInitializing,
+
+        /* Idle, NoToken */
+        GenerateToken,
+        ReceivedDataNeedingReply,
+        ReceivedToken,
+
+        /* PollForMaster */
+        ReceivedUnexpectedFrame, //also from WaitForReply
+        DoneWithPFM,
+        ReceivedReplyToPFM,
+        SoleMaster, //also from DoneWithToken
+        DeclareSoleMaster,
+
+        /* UseToken */
+        SendAndWait,
+        NothingToSend,
+        SendNoWait,
+
+        /* DoneWithToken */
+        SendToken,
+        ResetMaintenancePFM,
+        SendMaintenancePFM,
+        SoleMasterRestartMaintenancePFM,
+        SendAnotherFrame,
+        NextStationUnknown,
+
+        /* WaitForReply */
+        ReplyTimeOut,
+        InvalidFrame,
+        ReceivedReply,
+        ReceivedPostpone,
+
+        /* PassToken */
+        FindNewSuccessor,
+        SawTokenUser,
+
+        /* AnswerDataRequest */
+        Reply,
+        DeferredReply
+    }
+
+    #region " Sniffer mode "
+
+    // Used in Sniffer only mode
+    public delegate void RawMessageReceivedHandler(byte[] buffer, int offset, int lenght);
+
+    public event RawMessageReceivedHandler RawMessageRecieved;
+
+    public void StartSpyMode()
+    {
+        if (_port == null) return;
+        _port.Open();
+
+        var th = new Thread(MstpThreadSniffer) { IsBackground = true };
+        th.Start();
+    }
+
+    // Just Sniffer mode, no Bacnet activity generated here
+    // Modif FC
+    private void MstpThreadSniffer()
+    {
+        while (true)
+        {
+            try
+            {
+                var status = GetNextMessage(T_NO_TOKEN, out _, out _, out _, out var msgLength);
+
+                switch (status)
+                {
+                    case GetMessageStatus.ConnectionClose:
+                        _port = null;
+                        return;
+
+                    case GetMessageStatus.Good:
+                        // frame event client ?
+                        if (RawMessageRecieved != null)
+                        {
+                            var length = msgLength + MSTP.MSTP_HEADER_LENGTH + (msgLength > 0 ? 2 : 0);
+
+                            // Array copy
+                            // after that it could be put asynchronously another time in the Main message loop
+                            // without any problem
+                            var packet = new byte[length];
+                            Array.Copy(_localBuffer, 0, packet, 0, length);
+
+                            // No need to use the thread pool, if the pipe is too slow
+                            // frames task list will grow infinitly
+                            RawMessageRecieved(packet, 0, length);
+                        }
+                        RemoveCurrentMessage(msgLength);
+                        break;
+                }
+            }
+            catch
+            {
+                _port = null;
+            }
+        }
+    }
+
+    #endregion
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPipeTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPipeTransport.cs
new file mode 100644
index 0000000..6d73437
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPipeTransport.cs
@@ -0,0 +1,255 @@
+namespace System.IO.BACnet;
+
+public class BacnetPipeTransport : IBacnetSerialTransport
+{
+    private PipeStream _conn;
+    private IAsyncResult _currentRead;
+    private IAsyncResult _currentConnect;
+    private readonly bool _isServer;
+
+    public string Name { get; }
+    public int BytesToRead => PeekPipe();
+
+    public static string[] AvailablePorts
+    {
+        get
+        {
+            try
+            {
+                var listOfPipes = Directory.GetFiles(@"\\.\pipe\");
+                for (var i = 0; i < listOfPipes.Length; i++)
+                    listOfPipes[i] = listOfPipes[i].Replace(@"\\.\pipe\", "");
+                return listOfPipes;
+            }
+            catch (Exception ex)
+            {
+                var log = LogManager.GetLogger<BacnetPipeTransport>();
+                log.Warn("Exception in AvailablePorts", ex);
+                return InteropAvailablePorts;
+            }
+        }
+    }
+
+    public BacnetPipeTransport(string name, bool isServer = false)
+    {
+        Name = name;
+        _isServer = isServer;
+    }
+
+    /// <summary>
+    /// Get the available byte count. (The .NET pipe interface has a few lackings. See also the "InteropAvailablePorts" function)
+    /// </summary>
+    [DllImport("kernel32.dll", EntryPoint = "PeekNamedPipe", SetLastError = true)]
+    private static extern bool PeekNamedPipe(IntPtr handle, IntPtr buffer, uint nBufferSize, IntPtr bytesRead, ref uint bytesAvail, IntPtr bytesLeftThisMessage);
+
+    public int PeekPipe()
+    {
+        uint bytesAvail = 0;
+        return PeekNamedPipe(_conn.SafePipeHandle.DangerousGetHandle(), IntPtr.Zero, 0, IntPtr.Zero, ref bytesAvail, IntPtr.Zero)
+            ? (int)bytesAvail
+            : 0;
+    }
+
+    public override string ToString()
+    {
+        return Name;
+    }
+
+    public override int GetHashCode()
+    {
+        return Name.GetHashCode();
+    }
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not BacnetPipeTransport) return false;
+        var a = (BacnetPipeTransport)obj;
+        return Name.Equals(a.Name);
+    }
+
+    public void Open()
+    {
+        if (_conn != null) Close();
+
+        if (!_isServer)
+        {
+            _conn = new NamedPipeClientStream(".", Name, PipeDirection.InOut, PipeOptions.Asynchronous);
+            ((NamedPipeClientStream)_conn).Connect(3000);
+        }
+        else
+        {
+            _conn = new NamedPipeServerStream(Name, PipeDirection.InOut, 20, PipeTransmissionMode.Byte, PipeOptions.Asynchronous);
+        }
+    }
+
+    public void Write(byte[] buffer, int offset, int length)
+    {
+        if (!_conn.IsConnected) return;
+        try
+        {
+            //doing syncronous writes (to an Asynchronous pipe) seems to be a bad thing
+            _conn.BeginWrite(buffer, offset, length, (r) => { _conn.EndWrite(r); }, null);
+        }
+        catch (IOException)
+        {
+            Disconnect();
+        }
+    }
+
+    private void Disconnect()
+    {
+        if (_conn is NamedPipeServerStream stream)
+        {
+            try
+            {
+                stream.Disconnect();
+            }
+            catch
+            {
+            }
+            _currentConnect = null;
+        }
+        _currentRead = null;
+    }
+
+    private bool WaitForConnection(int timeoutMs)
+    {
+        if (_conn.IsConnected) return true;
+        if (_conn is not NamedPipeServerStream) return true;
+
+        var server = (NamedPipeServerStream)_conn;
+
+        if (_currentConnect == null)
+        {
+            try
+            {
+                _currentConnect = server.BeginWaitForConnection(null, null);
+            }
+            catch (IOException)
+            {
+                Disconnect();
+                _currentConnect = server.BeginWaitForConnection(null, null);
+            }
+        }
+
+        if (_currentConnect.IsCompleted || _currentConnect.AsyncWaitHandle.WaitOne(timeoutMs))
+        {
+            try
+            {
+                server.EndWaitForConnection(_currentConnect);
+            }
+            catch (IOException)
+            {
+                Disconnect();
+            }
+            _currentConnect = null;
+        }
+
+        return _conn.IsConnected;
+    }
+
+    public int Read(byte[] buffer, int offset, int length, int timeoutMs)
+    {
+        if (!WaitForConnection(timeoutMs)) return -BacnetMstpProtocolTransport.ETIMEDOUT;
+
+        if (_currentRead == null)
+        {
+            try
+            {
+                _currentRead = _conn.BeginRead(buffer, offset, length, null, null);
+            }
+            catch (Exception)
+            {
+                Disconnect();
+                return -1;
+            }
+        }
+
+        if (!_currentRead.IsCompleted && !_currentRead.AsyncWaitHandle.WaitOne(timeoutMs))
+            return -BacnetMstpProtocolTransport.ETIMEDOUT;
+
+        try
+        {
+            var rx = _conn.EndRead(_currentRead);
+            _currentRead = null;
+            return rx;
+        }
+        catch (Exception)
+        {
+            Disconnect();
+            return -1;
+        }
+    }
+
+    public void Close()
+    {
+        if (_conn == null) return;
+        _conn.Close();
+        _conn = null;
+    }
+
+    public void Dispose()
+    {
+        Close();
+    }
+
+    #region " Interop Get Pipe Names "
+    // ReSharper disable All
+
+    [StructLayout(LayoutKind.Sequential)]
+    private struct FILETIME
+    {
+        public uint dwLowDateTime;
+        public uint dwHighDateTime;
+    }
+
+    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
+    private struct WIN32_FIND_DATA
+    {
+        public uint dwFileAttributes;
+        public FILETIME ftCreationTime;
+        public FILETIME ftLastAccessTime;
+        public FILETIME ftLastWriteTime;
+        public uint nFileSizeHigh;
+        public uint nFileSizeLow;
+        public uint dwReserved0;
+        public uint dwReserved1;
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
+        public string cFileName;
+        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 14)]
+        public string cAlternateFileName;
+    }
+
+    [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
+    private static extern IntPtr FindFirstFile(string lpFileName, out WIN32_FIND_DATA lpFindFileData);
+    [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
+    private static extern int FindNextFile(IntPtr hFindFile, out WIN32_FIND_DATA lpFindFileData);
+    [DllImport("kernel32.dll")]
+    private static extern bool FindClose(IntPtr hFindFile);
+
+    /// <summary>
+    /// The built-in functions for pipe enumeration isn't perfect, I'm afraid. Hence this messy interop.
+    /// </summary>
+    private static string[] InteropAvailablePorts
+    {
+        get
+        {
+            var ret = new List<string>();
+            var handle = FindFirstFile(@"\\.\pipe\*", out var data);
+            if (handle == new IntPtr(-1))
+                return ret.ToArray();
+
+            do
+            {
+                ret.Add(data.cFileName);
+            }
+            while (FindNextFile(handle, out data) != 0);
+
+            FindClose(handle);
+            return ret.ToArray();
+        }
+    }
+
+    // ReSharper restore
+    #endregion
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPtpProtocolTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPtpProtocolTransport.cs
new file mode 100644
index 0000000..f4f7c07
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetPtpProtocolTransport.cs
@@ -0,0 +1,607 @@
+namespace System.IO.BACnet;
+
+/// <summary>
+///     This is the standard BACNet PTP transport
+/// </summary>
+public class BacnetPtpProtocolTransport : BacnetTransportBase
+{
+    public const int T_HEARTBEAT = 15000;
+    public const int T_FRAME_ABORT = 2000;
+    private bool _isConnected;
+    private readonly bool _isServer;
+    private readonly ManualResetEvent _maySend = new(false);
+    private IBacnetSerialTransport _port;
+    private bool _sequenceCounter;
+    private Thread _thread;
+
+    public string Password { get; set; }
+
+    public BacnetPtpProtocolTransport(IBacnetSerialTransport transport, bool isServer)
+    {
+        _port = transport;
+        _isServer = isServer;
+        Type = BacnetAddressTypes.PTP;
+        HeaderLength = PTP.PTP_HEADER_LENGTH;
+        MaxBufferLength = 502;
+        MaxAdpuLength = PTP.PTP_MAX_APDU;
+    }
+
+    public BacnetPtpProtocolTransport(string portName, int baudRate, bool isServer)
+        : this(new BacnetSerialPortTransport(portName, baudRate), isServer)
+    {
+    }
+
+    public override int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address, bool waitForTransmission,
+        int timeout)
+    {
+        var frameType = BacnetPtpFrameTypes.FRAME_TYPE_DATA0;
+        if (_sequenceCounter) frameType = BacnetPtpFrameTypes.FRAME_TYPE_DATA1;
+        _sequenceCounter = !_sequenceCounter;
+
+        //add header
+        var fullLength = PTP.Encode(buffer, offset - PTP.PTP_HEADER_LENGTH, frameType, dataLength);
+
+        //wait for send allowed
+        if (!_maySend.WaitOne(timeout))
+            return -BacnetMstpProtocolTransport.ETIMEDOUT;
+
+        Log.Debug(frameType);
+
+        //send
+        SendWithXonXoff(buffer, offset - HeaderLength, fullLength);
+        return dataLength;
+    }
+
+    public override BacnetAddress GetBroadcastAddress()
+    {
+        return new BacnetAddress(BacnetAddressTypes.PTP, 0xFFFF, new byte[0]);
+    }
+
+    public override void Start()
+    {
+        if (_port == null) return;
+
+        _thread = new Thread(PTPThread)
+        {
+            Name = "PTP Read",
+            IsBackground = true
+        };
+        _thread.Start();
+    }
+
+    public override void Dispose()
+    {
+        _port?.Close();
+        _port = null;
+    }
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not BacnetPtpProtocolTransport) return false;
+        var a = (BacnetPtpProtocolTransport)obj;
+        return _port.Equals(a._port);
+    }
+
+    public override int GetHashCode()
+    {
+        return _port.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return _port.ToString();
+    }
+
+    private void SendGreeting()
+    {
+        Log.Debug("Sending Greeting");
+        byte[] greeting = { PTP.PTP_GREETING_PREAMBLE1, PTP.PTP_GREETING_PREAMBLE2, 0x43, 0x6E, 0x65, 0x74, 0x0D }; // BACnet\n
+        _port.Write(greeting, 0, greeting.Length);
+    }
+
+    private static bool IsGreeting(IList<byte> buffer, int offset, int maxOffset)
+    {
+        byte[] greeting = { PTP.PTP_GREETING_PREAMBLE1, PTP.PTP_GREETING_PREAMBLE2, 0x43, 0x6E, 0x65, 0x74, 0x0D }; // BACnet\n
+        maxOffset = Math.Min(offset + greeting.Length, maxOffset);
+        for (var i = offset; i < maxOffset; i++)
+            if (buffer[i] != greeting[i - offset])
+                return false;
+        return true;
+    }
+
+    private static void RemoveGreetingGarbage(byte[] buffer, ref int maxOffset)
+    {
+        while (maxOffset > 0)
+        {
+            while (maxOffset > 0 && buffer[0] != 0x42)
+            {
+                if (maxOffset > 1)
+                    Array.Copy(buffer, 1, buffer, 0, maxOffset - 1);
+                maxOffset--;
+            }
+            if (maxOffset > 1 && buffer[1] != 0x41)
+                buffer[0] = 0xFF;
+            else if (maxOffset > 2 && buffer[2] != 0x43)
+                buffer[0] = 0xFF;
+            else if (maxOffset > 3 && buffer[3] != 0x6E)
+                buffer[0] = 0xFF;
+            else if (maxOffset > 4 && buffer[4] != 0x65)
+                buffer[0] = 0xFF;
+            else if (maxOffset > 5 && buffer[5] != 0x74)
+                buffer[0] = 0xFF;
+            else if (maxOffset > 6 && buffer[6] != 0x0D)
+                buffer[0] = 0xFF;
+            else
+                break;
+        }
+    }
+
+    private bool WaitForGreeting(int timeout)
+    {
+        if (_port == null) return false;
+        var buffer = new byte[7];
+        var offset = 0;
+        while (offset < 7)
+        {
+            var currentTimeout = offset == 0 ? timeout : T_FRAME_ABORT;
+            var rx = _port.Read(buffer, offset, 7 - offset, currentTimeout);
+            if (rx <= 0) return false;
+            offset += rx;
+
+            //remove garbage
+            RemoveGreetingGarbage(buffer, ref offset);
+        }
+        return true;
+    }
+
+    private bool Reconnect()
+    {
+        _isConnected = false;
+        _maySend.Reset();
+
+        if (_port == null)
+            return false;
+
+        try
+        {
+            _port.Close();
+        }
+        catch
+        {
+        }
+
+        try
+        {
+            _port.Open();
+        }
+        catch
+        {
+            return false;
+        }
+
+        //connect procedure
+        if (_isServer)
+        {
+            ////wait for greeting
+            //if (!WaitForGreeting(-1))
+            //{
+            //    Log.Debug("Garbage Greeting");
+            //    return false;
+            //}
+            //if (StateLogging)
+            //    Log.Debug("Got Greeting");
+
+            ////request connection
+            //SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_REQUEST);
+        }
+        else
+        {
+            //send greeting
+            SendGreeting();
+        }
+
+        _isConnected = true;
+        return true;
+    }
+
+    private void RemoveGarbage(byte[] buffer, ref int length)
+    {
+        //scan for preambles
+        for (var i = 0; i < length - 1; i++)
+        {
+            if ((buffer[i] != PTP.PTP_PREAMBLE1 || buffer[i + 1] != PTP.PTP_PREAMBLE2) && !IsGreeting(buffer, i, length))
+                continue;
+
+            if (i <= 0)
+                return;
+
+            //move back
+            Array.Copy(buffer, i, buffer, 0, length - i);
+            length -= i;
+            Log.Debug("Garbage");
+            return;
+        }
+
+        //one preamble?
+        if (length > 0 &&
+            (buffer[length - 1] == PTP.PTP_PREAMBLE1 || buffer[length - 1] == PTP.PTP_GREETING_PREAMBLE1))
+        {
+            buffer[0] = buffer[length - 1];
+            length = 1;
+            Log.Debug("Garbage");
+            return;
+        }
+
+        //no preamble?
+        if (length <= 0)
+            return;
+
+        length = 0;
+        Log.Debug("Garbage");
+    }
+
+    private static void RemoveXonOff(byte[] buffer, int offset, ref int maxOffset, ref bool complimentNext)
+    {
+        //X'10' (DLE)  => X'10' X'90' 
+        //X'11' (XON)  => X'10' X'91' 
+        //X'13' (XOFF) => X'10' X'93'
+
+        for (var i = offset; i < maxOffset; i++)
+        {
+            if (complimentNext)
+            {
+                buffer[i] &= 0x7F;
+                complimentNext = false;
+            }
+            else if (buffer[i] == 0x11 || buffer[i] == 0x13 || buffer[i] == 0x10)
+            {
+                if (buffer[i] == 0x10) complimentNext = true;
+                if (maxOffset - i > 0)
+                    Array.Copy(buffer, i + 1, buffer, i, maxOffset - i);
+                maxOffset--;
+                i--;
+            }
+        }
+    }
+
+    private void SendWithXonXoff(byte[] buffer, int offset, int length)
+    {
+        var escape = new byte[1] { 0x10 };
+        var maxOffset = length + offset;
+
+        //scan
+        for (var i = offset; i < maxOffset; i++)
+        {
+            if (buffer[i] != 0x10 && buffer[i] != 0x11 && buffer[i] != 0x13)
+                continue;
+
+            _port.Write(buffer, offset, i - offset);
+            _port.Write(escape, 0, 1);
+            buffer[i] |= 0x80;
+            offset = i;
+        }
+
+        //leftover
+        _port.Write(buffer, offset, maxOffset - offset);
+    }
+
+    private void SendFrame(BacnetPtpFrameTypes frameType, byte[] buffer = null, int msgLength = 0)
+    {
+        if (_port == null)
+            return;
+
+        var fullLength = PTP.PTP_HEADER_LENGTH + msgLength + (msgLength > 0 ? 2 : 0);
+        if (buffer == null) buffer = new byte[fullLength];
+        PTP.Encode(buffer, 0, frameType, msgLength);
+
+        Log.Debug(frameType);
+
+        //send
+        SendWithXonXoff(buffer, 0, fullLength);
+    }
+
+    private void SendDisconnect(BacnetPtpDisconnectReasons bacnetPtpDisconnectReasons)
+    {
+        var buffer = new byte[PTP.PTP_HEADER_LENGTH + 1 + 2];
+        buffer[PTP.PTP_HEADER_LENGTH] = (byte)bacnetPtpDisconnectReasons;
+        SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_REQUEST, buffer, 1);
+    }
+
+    private BacnetMstpProtocolTransport.GetMessageStatus ProcessRxStatus(byte[] buffer, ref int offset, int rx)
+    {
+        if (rx == -BacnetMstpProtocolTransport.ETIMEDOUT)
+        {
+            //drop message
+            var status = offset == 0
+                ? BacnetMstpProtocolTransport.GetMessageStatus.Timeout
+                : BacnetMstpProtocolTransport.GetMessageStatus.SubTimeout;
+            buffer[0] = 0xFF;
+            RemoveGarbage(buffer, ref offset);
+            return status;
+        }
+        if (rx < 0)
+        {
+            //drop message
+            buffer[0] = 0xFF;
+            RemoveGarbage(buffer, ref offset);
+            return BacnetMstpProtocolTransport.GetMessageStatus.ConnectionError;
+        }
+
+        if (rx != 0)
+            return BacnetMstpProtocolTransport.GetMessageStatus.Good;
+
+        //drop message
+        buffer[0] = 0xFF;
+        RemoveGarbage(buffer, ref offset);
+        return BacnetMstpProtocolTransport.GetMessageStatus.ConnectionClose;
+    }
+
+    private BacnetMstpProtocolTransport.GetMessageStatus GetNextMessage(byte[] buffer, ref int offset,
+        int timeoutMs, out BacnetPtpFrameTypes frameType, out int msgLength)
+    {
+        BacnetMstpProtocolTransport.GetMessageStatus status;
+        var timeout = timeoutMs;
+
+        frameType = BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XOFF;
+        msgLength = 0;
+        var complimentNext = false;
+
+        //fetch header
+        while (offset < PTP.PTP_HEADER_LENGTH)
+        {
+            if (_port == null) return BacnetMstpProtocolTransport.GetMessageStatus.ConnectionClose;
+
+            timeout = offset > 0 ? T_FRAME_ABORT : timeoutMs;
+
+            //read 
+            var rx = _port.Read(buffer, offset, PTP.PTP_HEADER_LENGTH - offset, timeout);
+            status = ProcessRxStatus(buffer, ref offset, rx);
+            if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
+
+            //remove XON/XOFF
+            var newOffset = offset + rx;
+            RemoveXonOff(buffer, offset, ref newOffset, ref complimentNext);
+            offset = newOffset;
+
+            //remove garbage
+            RemoveGarbage(buffer, ref offset);
+        }
+
+        //greeting
+        if (IsGreeting(buffer, 0, offset))
+        {
+            //get last byte
+            var rx = _port.Read(buffer, offset, 1, timeout);
+            status = ProcessRxStatus(buffer, ref offset, rx);
+            if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
+            offset += 1;
+            if (IsGreeting(buffer, 0, offset))
+            {
+                frameType = BacnetPtpFrameTypes.FRAME_TYPE_GREETING;
+                Log.Debug(frameType);
+                return BacnetMstpProtocolTransport.GetMessageStatus.Good;
+            }
+            //drop message
+            buffer[0] = 0xFF;
+            RemoveGarbage(buffer, ref offset);
+            return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
+        }
+
+        //decode
+        if (PTP.Decode(buffer, 0, offset, out frameType, out msgLength) < 0)
+        {
+            //drop message
+            buffer[0] = 0xFF;
+            RemoveGarbage(buffer, ref offset);
+            return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
+        }
+
+        //valid length?
+        var fullMsgLength = msgLength + PTP.PTP_HEADER_LENGTH + (msgLength > 0 ? 2 : 0);
+        if (msgLength > MaxBufferLength)
+        {
+            //drop message
+            buffer[0] = 0xFF;
+            RemoveGarbage(buffer, ref offset);
+            return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
+        }
+
+        //fetch data
+        if (msgLength > 0)
+        {
+            timeout = T_FRAME_ABORT; //set sub timeout
+            while (offset < fullMsgLength)
+            {
+                //read 
+                var rx = _port.Read(buffer, offset, fullMsgLength - offset, timeout);
+                status = ProcessRxStatus(buffer, ref offset, rx);
+                if (status != BacnetMstpProtocolTransport.GetMessageStatus.Good) return status;
+
+                //remove XON/XOFF
+                var newOffset = offset + rx;
+                RemoveXonOff(buffer, offset, ref newOffset, ref complimentNext);
+                offset = newOffset;
+            }
+
+            //verify data crc
+            if (PTP.Decode(buffer, 0, offset, out frameType, out msgLength) < 0)
+            {
+                //drop message
+                buffer[0] = 0xFF;
+                RemoveGarbage(buffer, ref offset);
+                return BacnetMstpProtocolTransport.GetMessageStatus.DecodeError;
+            }
+        }
+
+        Log.Debug(frameType);
+
+        //done
+        return BacnetMstpProtocolTransport.GetMessageStatus.Good;
+    }
+
+    private void PTPThread()
+    {
+        var buffer = new byte[MaxBufferLength];
+        try
+        {
+            while (_port != null)
+            {
+                //connect if needed
+                if (!_isConnected)
+                {
+                    if (!Reconnect())
+                    {
+                        Thread.Sleep(1000);
+                        continue;
+                    }
+                }
+
+                //read message
+                var offset = 0;
+                var status = GetNextMessage(buffer, ref offset, T_HEARTBEAT, out var frameType, out var msgLength);
+
+                //action
+                switch (status)
+                {
+                    case BacnetMstpProtocolTransport.GetMessageStatus.ConnectionClose:
+                    case BacnetMstpProtocolTransport.GetMessageStatus.ConnectionError:
+                        Log.Warn("Connection disturbance");
+                        Reconnect();
+                        break;
+
+                    case BacnetMstpProtocolTransport.GetMessageStatus.DecodeError:
+                        Log.Warn("PTP decode error");
+                        break;
+
+                    case BacnetMstpProtocolTransport.GetMessageStatus.SubTimeout:
+                        Log.Warn("PTP frame abort");
+                        break;
+
+                    case BacnetMstpProtocolTransport.GetMessageStatus.Timeout:
+                        SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XON);
+                        //both server and client will send this
+                        break;
+
+                    case BacnetMstpProtocolTransport.GetMessageStatus.Good:
+
+                        //action
+                        switch (frameType)
+                        {
+                            case BacnetPtpFrameTypes.FRAME_TYPE_GREETING:
+                                //request connection
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_REQUEST);
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XON:
+                                _maySend.Set();
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XOFF:
+                                _maySend.Reset();
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA0:
+                                //send confirm
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK0_XON);
+
+                                //notify the sky!
+                                InvokeMessageRecieved(buffer, PTP.PTP_HEADER_LENGTH, msgLength, GetBroadcastAddress());
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA1:
+                                //send confirm
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK1_XON);
+                                //notify the sky!
+                                InvokeMessageRecieved(buffer, PTP.PTP_HEADER_LENGTH, msgLength, GetBroadcastAddress());
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK0_XOFF:
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK1_XOFF:
+                                //so, the other one got the message, eh?
+                                _maySend.Reset();
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK0_XON:
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_ACK1_XON:
+                                //so, the other one got the message, eh?
+                                _maySend.Set();
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_NAK0_XOFF:
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_NAK1_XOFF:
+                                _maySend.Reset();
+                                //denial, eh?
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_NAK0_XON:
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DATA_NAK1_XON:
+                                _maySend.Set();
+                                //denial, eh?
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_REQUEST:
+                                //also send a password perhaps?
+                                if (!string.IsNullOrEmpty(Password))
+                                {
+                                    var pass = Encoding.ASCII.GetBytes(Password);
+                                    var tmpBuffer = new byte[PTP.PTP_HEADER_LENGTH + pass.Length + 2];
+                                    Array.Copy(pass, 0, tmpBuffer, PTP.PTP_HEADER_LENGTH, pass.Length);
+                                    SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_RESPONSE, tmpBuffer,
+                                        pass.Length);
+                                }
+                                else
+                                    SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_RESPONSE);
+                                //we're ready
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XON);
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_CONNECT_RESPONSE:
+                                if (msgLength > 0 && !string.IsNullOrEmpty(Password))
+                                {
+                                    var password = Encoding.ASCII.GetString(buffer, PTP.PTP_HEADER_LENGTH,
+                                        msgLength);
+                                    if (password != Password)
+                                        SendDisconnect(BacnetPtpDisconnectReasons.PTP_DISCONNECT_INVALID_PASSWORD);
+                                    else
+                                        SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XON); //we're ready
+                                }
+                                else
+                                {
+                                    //we're ready
+                                    SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_HEARTBEAT_XON);
+                                }
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_REQUEST:
+                                var reason = BacnetPtpDisconnectReasons.PTP_DISCONNECT_OTHER;
+                                if (msgLength > 0)
+                                    reason = (BacnetPtpDisconnectReasons)buffer[PTP.PTP_HEADER_LENGTH];
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_RESPONSE);
+                                Log.Debug($"Disconnect requested: {reason}");
+                                Reconnect();
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_DISCONNECT_RESPONSE:
+                                _maySend.Reset();
+                                //hopefully we'll be closing down now
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_TEST_REQUEST:
+                                SendFrame(BacnetPtpFrameTypes.FRAME_TYPE_TEST_RESPONSE, buffer, msgLength);
+                                break;
+
+                            case BacnetPtpFrameTypes.FRAME_TYPE_TEST_RESPONSE:
+                                //good
+                                break;
+                        }
+                        break;
+                }
+            }
+            Log.Debug("PTP thread is closing down");
+        }
+        catch (Exception ex)
+        {
+            Log.Error($"Exception in PTP thread", ex);
+        }
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetSerialPortTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetSerialPortTransport.cs
new file mode 100644
index 0000000..3ff2b07
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetSerialPortTransport.cs
@@ -0,0 +1,72 @@
+namespace System.IO.BACnet;
+
+public class BacnetSerialPortTransport : IBacnetSerialTransport
+{
+    private readonly string _portName;
+    private readonly SerialPort _port;
+
+    public int BytesToRead => _port?.BytesToRead ?? 0;
+
+    public BacnetSerialPortTransport(string portName, int baudRate)
+    {
+        _portName = portName;
+        _port = new SerialPort(_portName, baudRate, Parity.None, 8, StopBits.One);
+    }
+
+    public override bool Equals(object obj)
+    {
+        if (obj is not BacnetSerialPortTransport) return false;
+        var a = (BacnetSerialPortTransport)obj;
+        return _portName.Equals(a._portName);
+    }
+
+    public override int GetHashCode()
+    {
+        return _portName.GetHashCode();
+    }
+
+    public override string ToString()
+    {
+        return _portName;
+    }
+
+    public void Open()
+    {
+        _port.Open();
+    }
+
+    public void Write(byte[] buffer, int offset, int length)
+    {
+        _port?.Write(buffer, offset, length);
+    }
+
+    public int Read(byte[] buffer, int offset, int length, int timeoutMs)
+    {
+        if (_port == null) return 0;
+        _port.ReadTimeout = timeoutMs;
+
+        try
+        {
+            var rx = _port.Read(buffer, offset, length);
+            return rx;
+        }
+        catch (TimeoutException)
+        {
+            return -BacnetMstpProtocolTransport.ETIMEDOUT;
+        }
+        catch (Exception)
+        {
+            return -1;
+        }
+    }
+
+    public void Close()
+    {
+        _port?.Close();
+    }
+
+    public void Dispose()
+    {
+        Close();
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportBase.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportBase.cs
new file mode 100644
index 0000000..d6975cc
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportBase.cs
@@ -0,0 +1,36 @@
+namespace System.IO.BACnet;
+
+public abstract class BacnetTransportBase : IBacnetTransport
+{
+    public ILog Log { get; set; }
+    public int HeaderLength { get; protected set; }
+    public int MaxBufferLength { get; protected set; }
+    public BacnetAddressTypes Type { get; protected set; }
+    public BacnetMaxAdpu MaxAdpuLength { get; protected set; }
+    public byte MaxInfoFrames { get; set; } = 0xFF;
+
+    protected BacnetTransportBase()
+    {
+        Log = LogManager.GetLogger(GetType());
+    }
+
+    public abstract void Start();
+
+    public abstract BacnetAddress GetBroadcastAddress();
+
+    public virtual bool WaitForAllTransmits(int timeout)
+    {
+        return true; // not used 
+    }
+
+    public abstract int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address, bool waitForTransmission, int timeout);
+
+    public event MessageRecievedHandler MessageRecieved;
+
+    protected void InvokeMessageRecieved(byte[] buffer, int offset, int msgLength, BacnetAddress remoteAddress)
+    {
+        MessageRecieved?.Invoke(this, buffer, offset, msgLength, remoteAddress);
+    }
+
+    public abstract void Dispose();
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportEthernet.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportEthernet.cs
new file mode 100644
index 0000000..273bea8
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/BacnetTransportEthernet.cs
@@ -0,0 +1,224 @@
+/**************************************************************************
+*                           MIT License
+* 
+* Copyright (C) 2015 Frederic Chaxel <fchaxel@free.fr>
+*
+* lot of code ported from https://github.com/LorenVS/bacstack
+*      Copyright (C) 2014 Loren Van Spronsen, thank to him.
+* Thank to Christopher Gunther for the idea, and the starting code
+* 
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+
+namespace System.IO.BACnet;
+
+// A reference to PacketDotNet.dll & SharpPcap.dll should be made
+// in order to use this code
+// This class is not in the file BacnetTransport.cs to avoid integration 
+// of two dll when Bacnet/Ethernet is not used
+
+internal class BacnetEthernetProtocolTransport : BacnetTransportBase
+{
+    private LibPcapLiveDevice _device;
+    private byte[] _deviceMac; // Mac of the device
+    private readonly string _deviceName;
+
+    /// <summary>
+    /// </summary>
+    /// <param name="friendlydeviceName">Something like "Local Lan 1", "Wireless network", ...</param>
+    public BacnetEthernetProtocolTransport(string friendlydeviceName)
+    {
+        _deviceName = friendlydeviceName;
+        Type = BacnetAddressTypes.Ethernet;
+        MaxAdpuLength = BacnetMaxAdpu.MAX_APDU1476;
+        HeaderLength = 6 + 6 + 2 + 3;
+        MaxBufferLength = 1500;
+    }
+
+    public override BacnetAddress GetBroadcastAddress()
+    {
+        return new BacnetAddress(BacnetAddressTypes.Ethernet, "FF-FF-FF-FF-FF-FF", 65535);
+    }
+
+    public override void Start()
+    {
+        _device = Open();
+        if (_device == null) throw new Exception("Cannot open Ethernet interface");
+
+        _deviceMac = _device.Interface.MacAddress.GetAddressBytes();
+
+        // filter to only bacnet packets
+        _device.Filter = "ether proto 0x82";
+
+        var th = new Thread(CaptureThread) { IsBackground = true };
+        th.Start();
+    }
+
+    public override int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address,
+        bool waitForTransmission, int timeout)
+    {
+        var hdrOffset = 0;
+
+        for (var i = 0; i < 6; i++)
+            buffer[hdrOffset++] = address.adr[i];
+
+        // write the source mac address bytes
+        for (var i = 0; i < 6; i++)
+            buffer[hdrOffset++] = _deviceMac[i];
+
+        // the next 2 bytes are used for the packet length
+        buffer[hdrOffset++] = (byte)(((dataLength + 3) & 0xFF00) >> 8);
+        buffer[hdrOffset++] = (byte)((dataLength + 3) & 0xFF);
+
+        // DSAP and SSAP
+        buffer[hdrOffset++] = 0x82;
+        buffer[hdrOffset++] = 0x82;
+
+        // LLC control field
+        buffer[hdrOffset] = 0x03;
+
+        lock (_device)
+        {
+            _device.SendPacket(buffer, dataLength + HeaderLength);
+        }
+
+        return dataLength + HeaderLength;
+    }
+
+    public override void Dispose()
+    {
+        lock (_device)
+            _device.Close();
+    }
+
+    public override string ToString()
+    {
+        return "Ethernet";
+    }
+
+    private LibPcapLiveDevice Open()
+    {
+        var devices = LibPcapLiveDeviceList.Instance.Where(dev => dev.Interface != null);
+
+        if (!string.IsNullOrEmpty(_deviceName)) // specified interface
+        {
+            try
+            {
+                var device = devices.FirstOrDefault(dev => dev.Interface.FriendlyName == _deviceName);
+                device?.Open(DeviceMode.Normal, 1000); // 1000 ms read timeout
+                return device;
+            }
+            catch
+            {
+                return null;
+            }
+        }
+        foreach (var device in devices)
+        {
+            device.Open(DeviceMode.Normal, 1000); // 1000 ms read timeout
+            if (device.LinkType == LinkLayers.Ethernet
+                && device.Interface.MacAddress != null)
+                return device;
+            device.Close();
+        }
+
+        return null;
+    }
+
+    private void CaptureThread()
+    {
+        _device.NonBlockingMode = true; // Without that it's very, very slow
+        while (true)
+        {
+            try
+            {
+                var packet = _device.GetNextPacket();
+                if (packet != null)
+                    OnPacketArrival(packet);
+                else
+                    Thread.Sleep(10); // NonBlockingMode, we need to slow the overhead
+            }
+            catch
+            {
+                return;
+            } // closed interface sure !
+        }
+    }
+
+    private bool _isOutboundPacket(IList<byte> buffer, int offset)
+    {
+        // check to see if the source mac 100%
+        // matches the device mac address of the local device
+
+        for (var i = 0; i < 6; i++)
+        {
+            if (buffer[offset + i] != _deviceMac[i])
+                return false;
+        }
+
+        return true;
+    }
+
+    private static byte[] Mac(byte[] buffer, int offset)
+    {
+        var b = new byte[6];
+        Buffer.BlockCopy(buffer, offset, b, 0, 6);
+        return b;
+    }
+
+    private void OnPacketArrival(RawCapture packet)
+    {
+        // don't process any packet too short to not be valid
+        if (packet.Data.Length <= 17)
+            return;
+
+        var buffer = packet.Data;
+        var offset = 0;
+
+        // Got frames send by me, not for me, not broadcast
+        var dest = Mac(buffer, offset);
+        if (!_isOutboundPacket(dest, 0) && dest[0] != 255)
+            return;
+
+        offset += 6;
+
+        // source address
+        var bacSource = new BacnetAddress(BacnetAddressTypes.Ethernet, 0, Mac(buffer, offset));
+        offset += 6;
+
+        // len
+        var length = buffer[offset] * 256 + buffer[offset + 1];
+        offset += 2;
+
+        // 3 bytes LLC hearder
+        var dsap = buffer[offset++];
+        var ssap = buffer[offset++];
+        var control = buffer[offset++];
+
+        length -= 3; // Bacnet content length eq. ethernet lenght minus LLC header length
+
+        // don't process non-BACnet packets
+        if (dsap != 0x82 || ssap != 0x82 || control != 0x03)
+            return;
+
+        InvokeMessageRecieved(buffer, HeaderLength, length, bacSource);
+    }
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetSerialTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetSerialTransport.cs
new file mode 100644
index 0000000..3157ba8
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetSerialTransport.cs
@@ -0,0 +1,11 @@
+namespace System.IO.BACnet;
+
+public interface IBacnetSerialTransport : IDisposable
+{
+    int BytesToRead { get; }
+
+    void Open();
+    void Close();
+    int Read(byte[] buffer, int offset, int length, int timeoutMs);
+    void Write(byte[] buffer, int offset, int length);
+}
diff --git a/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetTransport.cs b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetTransport.cs
new file mode 100644
index 0000000..67d4ad6
--- /dev/null
+++ b/addons/EGFramework/Third_Part_SourceCode/BacNetPlugin/Transport/IBacnetTransport.cs
@@ -0,0 +1,17 @@
+namespace System.IO.BACnet;
+
+public interface IBacnetTransport : IDisposable
+{
+    byte MaxInfoFrames { get; set; }
+    int HeaderLength { get; }
+    int MaxBufferLength { get; }
+    BacnetAddressTypes Type { get; }
+    BacnetMaxAdpu MaxAdpuLength { get; }
+
+    void Start();
+    BacnetAddress GetBroadcastAddress();
+    bool WaitForAllTransmits(int timeout);
+    int Send(byte[] buffer, int offset, int dataLength, BacnetAddress address, bool waitForTransmission, int timeout);
+
+    event MessageRecievedHandler MessageRecieved;
+}