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POUDP in C# works on Windows but not Linux
 

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  1. POUDP in C# works on Windows but not Linux
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    <p>I'm using mono to build a C# program that needs to send and receive using UDP. Currently my implementation works as expected on Windows but I have issues getting communication to work with my Ubuntu or Fedora systems.</p> <p>Windows can broadcast and receive it's own datagrams. <br/> Ubuntu can broadcast and receive it's own datagrams. It's broadcasts are received by Windows but <em>it doesn't see datagrams broadcast by Windows.</em> <br> Fedora can broadcast but does not receive datagrams from anywhere (not even itself). It's broadcasts are received by Windows.</p> <p>When datagrams fail to reach either of the linux machines, the 'receive' function is never fired.</p> <p>This is what I have so far:</p> <pre><code>int _port = 4568; var server = new UdpClient(_port); var send_UDP = new UdpClient(); </code></pre> <p>The receive method uses the asynchronous calls of the UDPClient;</p> <pre><code>private static void receive() { server.BeginReceive(new AsyncCallback(receive), null); } private static void receive(IAsyncResult o) { try { // I'm told that port = 0 should receive from any port. var sender = new IPEndPoint(IPAddress.Any, 0); var data = server.EndReceive(o, ref sender); receive(); var str = new string(Encoding.ASCII.GetChars(data)); postmessage(sender.Address.ToString() + ":" + sender.Port.ToString() + " &gt; " + str); } catch {} } </code></pre> <p>And the send method;</p> <pre><code>public static void send(string message) { var target = new IPEndPoint(IPAddress.Parse("255.255.255.255"), _port); byte[] data = Encoding.ASCII.GetBytes(message); send_UDP.Send(data, data.Length, target); } </code></pre> <p>After some testing with Fedora, it seems to be an issue with the use of 255.255.255.255 to broadcast. Is there some other way to do this?</p>
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    1. USMicheal Hill
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    1. CODo you get any errors? Have you tried removing the `try-catch` to see if there is any runtime errors? Have you set a breakpoint in `receive` to see if it gets called at all?
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      1. USSome programmer dude
    2. COThe 'try-catch' is only for receiving from multiple users - in my debug code the exception is printed to the console. I'll try debugging the receive method on the other systems (it wasn't something I had thought to try).
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      1. USMicheal Hill
    3. COThe receive code is never fired on Fedora. This seems to be regardless of where the datagram originated (I tried sending from the local machine and from a windows box).
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