Add VestelEvc04 driver

TestApp/Driver/VestelEvc04.cs

@@ -0,0 +1,84 @@
+using NModbus;
+using System.Net.Sockets;
+
+namespace TestApp.Driver
+{
+    internal class VestelEvc04
+    {
+        private IModbusMaster? _Modbus;
+        private bool _Running;
+        private Thread _HeartbeatThread;
+
+        public string HostAddress { get; set; } = "192.168.178.100";
+        public int Port { get; set; } = 502;
+
+        public VestelEvc04()
+        {
+            _Running = true;
+            _HeartbeatThread = new Thread(HeartbeatLoop);
+            _HeartbeatThread.IsBackground = true;
+            _HeartbeatThread.Start();
+        }
+
+        private void Connect()
+        {
+            var factory = new ModbusFactory();
+            var tcpClient = new TcpClient(HostAddress, Port);
+            _Modbus = factory.CreateMaster(tcpClient);
+        }
+
+        private void Disconnect()
+        {
+            if (_Modbus is null) { return; }
+            _Modbus.Dispose();
+            _Modbus = null;
+        }
+
+        private void HeartbeatLoop()
+        {
+            try
+            {
+                while (_Running)
+                {
+                    if (_Modbus is null)
+                    {
+                        Connect();
+                    }
+                    if (_Modbus is null) { continue; }
+
+                    var heardbeatValue = _Modbus.ReadHoldingRegisters(255, 6000, 1)[0];
+                    if (heardbeatValue == 0) {
+                        _Modbus.WriteSingleRegister(255, 6000, 1);
+                    }
+
+                    Thread.Sleep(100);
+                }
+            }
+            catch (Exception e)
+            {
+                System.Diagnostics.Debug.WriteLine(e.Message);
+                Disconnect();
+            }
+        }
+
+        public void SetLoadingCurrent(double value)
+        {
+            try
+            {
+                if (_Modbus is null)
+                {
+                    Connect();
+                }
+                if (_Modbus is null) { return; }
+
+                ushort registerValue = (ushort)value;
+                _Modbus.WriteSingleRegister(255, 5004, registerValue);
+            }
+            catch (Exception e)
+            {
+                System.Diagnostics.Debug.WriteLine(e.Message);
+                Disconnect();
+            }
+        }
+    }
+}