Merge branch 'wxr4' into dev-tzy

wxr

2021-06-09 cb6e11c5067ecaba4d8f9907989154167c1e8943

 HDL_ON/DAL/DriverLayer/UdpSocket.cs

@@ -46,10 +46,9 @@
            busSocket = new Socket (AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            busSocket.EnableBroadcast = true;
            try {
                //busSocket.Bind (new IPEndPoint (IPAddress.Any, 6000));
                busSocket.Bind(new IPEndPoint(IPAddress.Any, Port));
            busSocket.Bind(new IPEndPoint(IPAddress.Any, Port));

                busSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.0.168.188")));
            busSocket.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("239.0.168.188")));
         }
         catch{
                busSocket = null;