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UDP Broadcast

I can't figure out why my code does not recieve the message. The only
message that it receives is the one going out from my machine. I am
suppose to send out a message to a server. Upon receiving that message
on the server side the server is suppose to send a message back. I
can't get my app to receive that message. It only receives the one
being sent out by my machine. I know that the server is sending out a
message because there is another app in vb that receives the message.
Here is my code:

private constructor()
iepSend = new IPEndPoint(IPAd dress.Broadcast , UDP_PORT);
epSend = (EndPoint)iepSe nd;

iepRx = new IPEndPoint(IPAd dress.Any, UDP_PORT);
epRx = (EndPoint)iepRx ;

m_SocketUDP = new Socket(AddressF amily.InterNetw ork, SocketType.Dgra m,
ProtocolType.Ud p);
m_SocketUDP.Set SocketOption(So cketOptionLevel .Socket,
SocketOptionNam e.Broadcast, 1);
m_SocketUDP.Set SocketOption(So cketOptionLevel .Socket,
SocketOptionNam e.ReuseAddress, 1);
m_SocketUDP.Con nect(epSend);

udpRxSocket = new Socket(iepRx.Ad dressFamily, SocketType.Dgra m,
ProtocolType.Ud p);
udpRxSocket.Set SocketOption(So cketOptionLevel .Socket,
SocketOptionNam e.ReuseAddress, 1);
udpRxSocket.Set SocketOption(So cketOptionLevel .Socket,
SocketOptionNam e.ReceiveTimeou t, 5000);
udpRxSocket.Bin d(iepRx);

SetupReceiveCal lbackUDP()


private void SetupReceiveCal lbackUDP()
AsyncCallback receiveData = new AsyncCallback(O nReceiveData);
udpRxSocket.Beg inReceiveFrom(b uffer, 0, buffer.Length,
SocketFlags.Non e, ref epRx, receiveData, udpRxSocket);


private void OnReceiveData(I AsyncResult ar)
Socket socket = (Socket)ar.Asyn cState;

int nBytesRec =
socket.EndRecei veFrom(ar, ref epRx);
if(nBytesRec > 0)
string Received =
Encoding.ASCII. GetString(buffe r, 0, nBytesRec);
//Received +=
socket.RemoteEn dPoint.ToString ();
WriteOutput("Re ceived Data: "
+ Received);
SetupReceiveCal lbackUDP();
catch(Exception e)
WriteOutput("Er ror. "+ e.Message);


Anyone know whats wrong?

Dec 20 '05 #1
0 1116

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