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POC#/.NET Receiving UDP packets
 

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    <p>I'm on OS X. I have a MIDI keyboard plugged in. In Audio MIDI Setup, I redirect MIDI events from the keyboard onto the network. it tells me it is using port 5004:</p> <p><img src="https://i.stack.imgur.com/VoQY6.png" alt="enter image description here"></p> <p>NOTE: Notice I have set 'who may connect me' to 'anyone', and in 'live routings' I have sent the MIDI keyboard routing INTO the network.</p> <p>Now from a C#/.NET script (within my Unity3D project), I attempt to listen to this port:</p> <pre><code>UdpClient udp; udp = new UdpClient( 5004 ) // &lt;-- SocketException: Address already in use System.Object myObj = null; udp.BeginReceive( new AsyncCallback( UDP_IncomingData ), myObj // udp_ep ); static void UDP_IncomingData( IAsyncResult ar ) { Debug.Log( "GotData" ); //Get the data from the response byte[] bResp = udp.EndReceive( ar, ref udp_ep ); //Convert the data to a string string sResponse = Encoding.UTF8.GetString( bResp ); //Display the string Console.WriteLine( sResponse ); //Close the UDP connection udp.Close( ); } </code></pre> <p>I can't understand this error message. Of course the port is in use; the MIDI keyboard should be broadcasting from this port.</p> <p>How do I listen to the broadcast?</p> <p>EDIT: I'm now thinking that I need to create the UDP client on a new unused port, and then connect to the port I'm interested in:</p> <pre><code>udp = new UdpClient( 0 ); // &lt;-- http://stackoverflow.com/questions/2456773/find-a-free-port udp.Connect( "192.168.0.13", 5004 ); </code></pre> <p>So now it doesn't generate any errors. But I press keys on the MIDI keyboard, and the received-data callback doesn't trigger. So I still don't know if I've got it right.</p>
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    1. CO"Address already in use" does not mean port...? Perhaps use the ctor overload that takes an IPEndPoint so you can specify all address/port components?
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