Added some TCP wrapper classes for testability

AMWD.Protocols.Modbus.Tcp/Utils/IPEndPointWrapper.cs

@@ -0,0 +1,32 @@
+using System.Net;
+
+namespace AMWD.Protocols.Modbus.Tcp.Utils
+{
+	internal class IPEndPointWrapper
+	{
+		private IPEndPoint _ipEndPoint;
+
+		public IPEndPointWrapper(EndPoint endPoint)
+		{
+			_ipEndPoint = (IPEndPoint)endPoint;
+		}
+
+		#region Properties
+
+		/// <inheritdoc  cref="IPEndPoint.Address"/>
+		public virtual IPAddress Address
+		{
+			get => _ipEndPoint.Address;
+			set => _ipEndPoint.Address = value;
+		}
+
+		/// <inheritdoc  cref="IPEndPoint.Port"/>
+		public virtual int Port
+		{
+			get => _ipEndPoint.Port;
+			set => _ipEndPoint.Port = value;
+		}
+
+		#endregion Properties
+	}
+}