Can’t receive data from UDP Sockect

Question

Hello:

I have a server listening on an UDP port. When the server
receives the text “Init”, starts to send me arrays of data. I want to receive
the data from a WP7.5.

I work with the latest 7.1 SDK. I test is with the
emulator and with the phone.

I take a look to the network traffic with
Wireshark, and I see the Init command sended to the server, and the response
from the server, but I have a Timeout in the phone side.

The code was copied from the “How to: Create and Use a UDP Socket Client
Application for Windows Phone” article in the MSDN -> http://msdn.microsoft.com/en-us/library/hh202864.aspx

This is the code:

        private Socket _socket = null;
        static ManualResetEvent _clientDone = new ManualResetEvent(false);
        private const int TIMEOUT_MILLISECONDS = 1000;
        private const int MAX_BUFFER_SIZE = 256;



        public byte[] SocketTest(string IP, int port)
        {
            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            string rSend = Send(IP, port, "Init");
            byte[] rRec = Receive(port);
            return rRec;
        }


        public string Send(string serverName, int portNumber, string data)
        {
            string response = "Operation Timeout";

            // We are re-using the _socket object that was initialized in the Connect method
            if (_socket != null)
            {
                // Create SocketAsyncEventArgs context object
                SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();

                // Set properties on context object
                socketEventArg.RemoteEndPoint = new DnsEndPoint(serverName, portNumber);

                // Inline event handler for the Completed event.
                // Note: This event handler was implemented inline in order to make this method self-contained.
                socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
                {
                    response = e.SocketError.ToString();

                    // Unblock the UI thread
                    _clientDone.Set();
                });

                // Add the data to be sent into the buffer
                byte[] payload = Encoding.UTF8.GetBytes(data);
                socketEventArg.SetBuffer(payload, 0, payload.Length);

                // Sets the state of the event to nonsignaled, causing threads to block
                _clientDone.Reset();

                // Make an asynchronous Send request over the socket
                _socket.SendToAsync(socketEventArg);

                // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
                // If no response comes back within this time then proceed
                _clientDone.WaitOne(TIMEOUT_MILLISECONDS);
            }
            else
            {
                response = "Socket is not initialized";
            }

            return response;
        }


        public byte[] Receive(int portNumber)
        {
            byte[] response = null;

            // We are receiving over an established socket connection
            if (_socket != null)
            {
                // Create SocketAsyncEventArgs context object
                SocketAsyncEventArgs socketEventArg = new SocketAsyncEventArgs();
                socketEventArg.RemoteEndPoint = new IPEndPoint(IPAddress.Any, portNumber);

                // Setup the buffer to receive the data
                socketEventArg.SetBuffer(new Byte[MAX_BUFFER_SIZE], 0, MAX_BUFFER_SIZE);

                // Inline event handler for the Completed event.
                // Note: This even handler was implemented inline in order to make this method self-contained.
                socketEventArg.Completed += new EventHandler<SocketAsyncEventArgs>(delegate(object s, SocketAsyncEventArgs e)
                {
                    if (e.SocketError == SocketError.Success)
                    {
                        // Retrieve the data from the buffer
                        response = e.Buffer;
                    }
                    else
                    {
                        response = null;
                    }

                    _clientDone.Set();
                });

                // Sets the state of the event to nonsignaled, causing threads to block
                _clientDone.Reset();

                // Make an asynchronous Receive request over the socket
                _socket.ReceiveFromAsync(socketEventArg);

                // Block the UI thread for a maximum of TIMEOUT_MILLISECONDS milliseconds.
                // If no response comes back within this time then proceed
                _clientDone.WaitOne(TIMEOUT_MILLISECONDS);
            }
            else
            {
                response = null;
            }

            return response;
        }

 

Can somebody help me?

Thanks for your time!

Juan Segura

Answer 1

There are not a problem with the code, the problem is the server.

I open a new post post with the question.

Answer 2

Can’t receive data from UDP Sockect. can you explain briefly how to solve it.?

Answer 3

HI,

How can you solve the  udp socket receives fails timeout exception or connectionreset exception.. kindly mail me  [e-mail]