I'm having a problem with the TCPClient/NetworkStream that I can't get
around. When I send something on the socket I don't know if it's
received by the server or not. I always get IsCompleted. IsCompleted
== true no matter if the server receives the packet or not. After 2
minutes I get the socket timeout if the server is unreachable.

I know the following:
SetSocketOption – Send timeout is not implemented on Win CE
The default Send timeout is 2 minutes
I can use socket Keep Alive but that affects all sockets on the system

The commonly suggested solution:
Use a timer to se if there is a pending message.
Let the server send a response for each packet. (We use GPRS and would
like to keep the network traffic to a minimum)

My question is:
How can I see if a socket (or NetworkStream) has a pending packet?
Some how the network layer knows it since it reports it after 2
minutes.

Thanx,
Niklas

//TcpClient m_tcpClient;
private void Send()
{
  try
  {
     string tmpString = "Hello";
     Encoding encStr = Encoding.Default;
     Byte[] ByteGet = encStr.GetBytes(tmpString);
     m_tcpClient.BeginSend(ByteGet, 0, ByteGet.Length,
        0, new AsyncCallback(SendMsgCallBack),
        new SentMsgStatStruct(m_tcpClient, tmpString));
  }
  catch( Exception exc )
  {
     MessageBox.Show("Exception: " + exc.ToString());
  }
}

private void SendMsgCallBack(System.IAsyncResult ar)
{
  try
  {
     MessageBox.Show("Completed: " + ar.IsCompleted.ToString());
     MessageBox.Show("Completed Sync: " +
ar.CompletedSynchronously.ToString());
     socket.EndSend(ar);
  }
  catch( SocketException e )
  {
     MessageBox.Show("Socket exception: " + e.ToString());
  }
  catch( Exception exc )
  {
     MessageBox.Show("Exception: " + exc.ToString());
  }
}