C# Windows Phone 8.1 GetOutputStreamAsync(...) blocking after first use -

i'm trying create basic test app should:

1) broadcast "sometext" on port "1234"
2) wait second answers
3) return answers

while solution posted below works fine first time, every subsequent call blocks forever at:
stream = await socket.getoutputstreamasync(...)

till tried every possible way of cleaning (since thats suppose failure), wrapping in using(...) statements.

the problem occurs emulator hardware device using windows phone 8.1

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thanks in advance!

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the code start "discovery":

private void button_click(object sender, routedeventargs e) {     pluginudp pudp = new pluginudp();     var task = pudp.scan("asf");     task.wait();     foreach (string s in task.result)         output.text += s + "\r\n";             } 

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the code "discovery" itself:

using system; using windows.networking; using windows.networking.sockets; using windows.storage.streams; using system.text; using system.io; using system.threading.tasks; using system.collections.concurrent;  using namespace whatever {     public class pluginudp     {         private static readonly hostname broadcastaddress = new hostname("255.255.255.255");         private static readonly string broadcastport = "1234";         private static readonly byte[] data = encoding.utf8.getbytes("00wlan-ping00");          concurrentbag<string> receivers;                  public async system.threading.tasks.task<string[]> scan(string options)         {             receivers = new concurrentbag<string>();             receivers.add("ok");              datagramsocket socket = null;             ioutputstream stream = null;             datawriter writer = null;              try             {                 socket = new datagramsocket();                                 socket.messagereceived += messagereceived;                  await socket.bindservicenameasync("");                  stream = await socket.getoutputstreamasync(broadcastaddress, broadcastport);                 writer = new datawriter(stream);                                 writer.writebytes(data);                 await writer.storeasync();                  task.delay(1000).wait();                             }             catch (exception exception)             {                 receivers.add(exception.message);             }                         {                 if (writer != null)                 {                     writer.detachstream();                     writer.dispose();                 }                  if(stream != null)                     stream.dispose();                  if(socket != null)                     socket.dispose();             }              return receivers.toarray(); ;         }          private async void messagereceived(datagramsocket socket, datagramsocketmessagereceivedeventargs args)         {             try             {                 var result = args.getdatastream();                 var resultstream = result.asstreamforread(1024);                  using (var reader = new streamreader(resultstream))                 {                     var text = await reader.readtoendasync();                     if (text.contains("pong"))                     {                         receivers.add(args.remoteaddress.tostring());                     }                 }             }             catch (exception exception)             {                 receivers.add("errcv");             }         }     } } 

your problem starts here:

task.wait(); 

you're blocking on async code, leads deadlock.

you want:

private async void button_click(object sender, routedeventargs e) {     pluginudp pudp = new pluginudp();     string[] result = await pudp.scan("asf");     foreach (string s in result)         output.text += s + "\r\n";             } 

you want do:

await task.delay(1000); 

instead of:

task.delay(1000).wait();