EMOS-TestApp/TestApp/Driver/VestelEvc04.cs

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();
            }
        }
    }
}