I have a problem with AsyncUdpSocket.
I used to connect to a server, send some data and get some response. Now since I do not know the actual address of the server I had
I could be completely crazy, but it seems like this is a standing issue with AsyncUdpSocket on iOS.
There's several error reports similar and even identical to yours on their Google Code page; people have complained that they are unable to receive Udp packets after broadcasting, and in some cases, even at all.
http://code.google.com/p/cocoaasyncsocket/issues/list?can=2&q=AsyncUdpSocket+receive