1 reply to this topic

[davasquez]

Hi all, im trying to send a message ND to PC(I want to see the message in PC), to use UDP socket and the port Ethernet/IP AF12. This is my code. //netduino OutputPort led = new OutputPort(Pins.ONBOARD_LED, false); Socket socket= new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Parse("130.151.132.55"), 44818); try { socket.Connect(localEndPoint); } catch (SocketException ex) { Debug.Print(ex.Message); } string texto="HI im Netduino"; byte[] bytesToSend=new byte[48]; bytesToSend = Encoding.UTF8.GetBytes(texto); socket.SendTo(bytesToSend, bytesToSend.Length, SocketFlags.None,localEndPoint); //PC ocket server = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);//con esta linea se crea el socket IPEndPoint sender = new IPEndPoint(IPAddress.Parse("130.151.132.55"), 44818);//define la IP de quien envia, tener en cuenta el mismo puerto server.Connect(sender); byte[] recieved = new byte[48]; EndPoint remoteEP = (sender); int BytesRecevied = server.ReceiveFrom(recieved, ref remoteEP); string dataRecieved = Encoding.ASCII.GetString(recieved); Console.WriteLine(dataRecieved.ToString()); Why show this error?: 'System.Net.Sockets.SocketException' en Microsoft.SPOT.Net.dll What is the error in the code?. Thanks

[Mario Vernari]

The following code works fine: I'm using it in my Modbus library.

*** Netduino as UDP master:

//create a UDP socket
            using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
            {
                //try the connection against the remote device
                var remoteip = new byte[4] { 192, 168, 0, 60 };
                var ipaddr = new IPAddress(remoteip);
                var ept = new IPEndPoint(ipaddr, 502);
                socket.Connect(ept);

                var buffer = new byte[] { 1,2,3 };
                socket.Send(buffer);

                Thread.Sleep(Timeout.Infinite);
           }

*** PC as UDP slave:

//create a UDP socket
            using (var socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp))
            {
                //bind it to the port 502 (standard Modbus)
                var ept = new IPEndPoint(IPAddress.Any, 502);
                socket.Bind(ept);

            //loop forever
            while (true)
            {
                //look for incoming data
                int length = socket.Available;

                if (length > 0)
                {
                    var buffer = new byte[length];
                    EndPoint remote = new IPEndPoint(IPAddress.Any, 0);

                    //read the data from the physical port
                    socket.ReceiveFrom(
                        buffer,
                        ref remote);

                    // ...
                }

                Thread.Sleep(0);
            }

            }

Take care to check your firewall, and consider also that the IP you are using does not look as private. I'd try with a local network first (e.g. 192.168.x.x)
Cheers