public bool DisconnectTestModbus(Behavior behavior)
        {
            testConnection = new TestModbusTCPConnection(behavior, "172.19.103.8");
            WTXModbusObj   = new WtxModbus(testConnection, 200);

            WTXModbusObj.Connect(this.OnConnect, 100);

            Thread.Sleep(1000); // Do something.... and disconnect.

            WTXModbusObj.Disconnect(this.OnDisconnect);

            return(WTXModbusObj.isConnected);
            // Alternative : Assert.AreEqual(WTXModbusObj.isConnected, true);
        }