5 replies to this topic

[MaYHeM]

Ultimately, I wish to have two Netduino Plus that communicate to each other with Streams over Sockets and both also communicate with a Desktop application in the same manner. What I'm struggling with is discovery. I would like the Netdiunos and the Desktop app to be able to find each other on the network without manual configuration of IP addresses at runtime. Any suggestion on how I could achieve that?

[Nicky]

I haven't tried it yet, but I'm planning on doing the same scenario. I think at network broadcast is the easiest way to do discovery, without DPWS.

[caEstrada]

MaYHeM , I wrote a simple VB.Net routine that sends a ping to NetduinoPlus in order to identify if my station in ON the network...if you need a copy of that simple code in VB, let me know... With that routine, all you have to do is include a (FOR i= ) statemente to cycle from 1 to 254 in a specific domain...

[caEstrada]

MaYHeM , If you want Netduion doing discovery, I have a simple UDP routine where you can send a message and if you receive an echo of the message sent, you can use it like ping. I do not know how to implement a ping from Netduino, so I wrote my own version.

[caEstrada]

MayHem, Just an idea... byte[] MAC = { 0x5C, 0x86, 0x4A, 0x00, 0x4E, 0x5B }; Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].EnableStaticIP("192.168.1.101", "255.255.255.0", "192.168.1.254"); Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].PhysicalAddress = MAC; //Microsoft.SPOT.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces()[0].EnableDhcp(); IPAddress remoteip = IPAddress.Parse(REMOTE_IP); //IPEndPoint remoteendpoint = new IPEndPoint(System.Net.IPAddress.Any, REMOTE_PORT); IPEndPoint remoteendpoint = new IPEndPoint(remoteip, REMOTE_PORT); //Configura un socket para recibir Datagramas via Internetwork usando el protocolo UDP Socket udp = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); //Vamos a procesar los broadcasts sin importar de cual estación vengan IPEndPoint broadcastEndPoint = new IPEndPoint(System.Net.IPAddress.Any, REMOTE_PORT); //Esta es la configuración para procesar comunicaciones UDP Broadcast, probado con el WireShark udp.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); udp.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, true); udp.SendTimeout = 100; //Asocia el socket para procesar broadcasts UDP de cualquier estación en la red usando el puerto indicado udp.Bind(broadcastEndPoint); if (udp.Available > 0) { //Separa en RAM tanto Bytes como sean necesarios byte[] byteReceiveBuffer = new byte[udp.Available + 20]; //Vamos a escuchar cualquier estación por el puerto definido //EndPoint remoteEndPoint = new IPEndPoint(System.Net.IPAddress.Any, REMOTE_PORT); EndPoint remoteEndPoint = new IPEndPoint(remoteip, REMOTE_PORT); //Cuantos bytes llegaron y copialos int iNumberOfBytes = udp.ReceiveFrom(byteReceiveBuffer, ref remoteEndPoint); }

[MaYHeM]

Thanks for the ideas.