UDP UWP server + Mono2x client

Question

I have a really weird issue with communication between server and client using UDP protocol. Client is written in Mono2x (I use Unity 3D as my client) and creates UdpClient class instance:

        _udpClient = new UdpClient(9050);
        _serverEP = new IPEndPoint(IPAddress.Parse(_serverIp), _serverPort);

My server is UWP application I want to run on Raspberry Pi that is using DatagramSocket:

        _udpServer = new DatagramSocket();
        _udpServer.MessageReceived += ClientCheck;
        await _udpServer.BindServiceNameAsync(port.ToString());

I send data from client to server but with no luck. I checked with TCPView that data is send from my client application but never reaches the server. And now is the weird part. When I receive message from server first (I hardcode port to client), my client is able to send data with a success.

I am using same IPEndPoint to send data from client without any changes after receiving packet from server, it just starts working. Honestly, I have no idea what I could do wrong, so I will be thankful for any advice.

score 0 · Accepted Answer · edited May 23 '17 at 11:46

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And now is the weird part. When I receive message from server first (I hardcode port to client), my client is able to send data with a success

This is a known issue which is filed based on this related question: https://stackoverflow.com/a/39767527/5254458

It includes the issue's description and temporary workaround.

The corresponding is team is investigating it and I can not guarantee that when the fix will be delivered.

edited May 23 '17 at 11:46

Community

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answered Mar 15 '17 at 08:44

Franklin Chen - MSFT

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Thank you for help! Does this issue occur only when server and client are on same machine? – user2586571 Mar 15 '17 at 10:04
@user2586571 For the specified issue I mentioned, not only – Franklin Chen - MSFT Mar 15 '17 at 10:30

UDP UWP server + Mono2x client

1 Answers1