pascal06

Hello,

I discover that mbed provide a online compiler compliant to RVDS 4.1 for users:
http://mbed.org/handbook/mbed-Compiler

What about this facility for Netduino users who wants to compile NETMF kit ?

rgds,

Hello,

Netbios name resolution can be a easy way to communicate with a NetduinoPlus. Especialy in case of using DHCP. With this feature, you can use (only on local subnet) the name of your Netduino instead of using IP address. But, it seems that NetduinoPlus doesn't support local broadcast UDP. My sample works on Emulator, but not on NetduinoPlus.

using System;
using System.Threading;
using Microsoft.SPOT;
using System.Net.Sockets;
using System.Net;
using Microsoft.SPOT.Net.NetworkInformation;

namespace Netbios
{
    public class Program
    {
        private const int UDP_PORT_NETBIOS_NS = 137;

        public static Byte[] EncodeNetbiosName(string Name)
        {
            byte[] result = new byte[32];
            char c;
            for (int i = 0; i < 15; i++)
            {
                c = i < Name.Length ? Name[i] : ' ';
                result[i * 2] = (byte)(((byte)(c) >> 4) + 65);
                result[(i * 2) + 1] = (byte)(((byte)(c) & 0x0f) + 65);
            }
            result[30] = 0x41;
            result[31] = 0x41;
            return result;
        }

        public static string DecodeNetbiosName(byte[] NbName)
        {
            string result = "";
            for (int i = 0; i < 15; i++)
            {
                byte b1 = NbName[i * 2];
                byte b2 = NbName[(i * 2) + 1];
                char c = (char)( ( (b1 - 65) << 4 ) | ( b2 - 65  ) );
                result += c;
            }
            return result;
        }

        public static bool BytesEqual(byte[] Array1, int Start1, byte[] Array2, int Start2, int Count)
        {
            bool result = true;
            for (int i = 0; i < Count - 1; i++)
            {
                if (Array1[i + Start1] != Array2[i + Start2])
                {
                    result = false;
                    break;
                }
            }
            return result;
        }

        public static void Main()
        {
            byte[] myNbName = EncodeNetbiosName("NETDUINO");

            NetworkInterface[] networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();

            using (Socket serverSocket = new Socket(AddressFamily.InterNetwork,
                                                    SocketType.Dgram,
                                                    ProtocolType.Udp))
            {
                EndPoint remoteEndPoint = new IPEndPoint(IPAddress.Any, UDP_PORT_NETBIOS_NS);
                byte[] IP = IPAddress.Parse(networkInterfaces[0].IPAddress).GetAddressBytes();
                serverSocket.Bind(remoteEndPoint);
                while (true)
                {
                    if (serverSocket.Poll(1000, //timeout in micro seconds
                                               SelectMode.SelectRead))
                    {
                        byte[] inBuffer = new byte[serverSocket.Available];
                        int count = serverSocket.ReceiveFrom(inBuffer, ref remoteEndPoint);
                        if ((inBuffer[2] >> 3) == 0) // opcode == 0
                        {
                            byte[] nbName = new byte[32];
                            Array.Copy(inBuffer, 13, nbName, 0, 32);
                            Debug.Print("NETBIOS NAME QUERY: "+DecodeNetbiosName(nbName));
                            if (BytesEqual(inBuffer, 13, myNbName, 0, 32))
                            {
                                byte[] outBuffer = new byte[62];
                                outBuffer[0] = inBuffer[0]; // trnid
                                outBuffer[1] = inBuffer[1]; // trnid
                                outBuffer[2] = 0x85;

                                outBuffer[3] = 0x00;
                                outBuffer[4] = 0x00;
                                outBuffer[5] = 0x00;
                                outBuffer[6] = 0x00;

                                outBuffer[7] = 0x01;

                                outBuffer[8] = 0x00;
                                outBuffer[9] = 0x00;
                                outBuffer[10] = 0x00;
                                outBuffer[11] = 0x00;

                                outBuffer[12] = 0x20;
                                for (int i = 0; i < 32; i++)
                                {
                                    outBuffer[i + 13] = myNbName[i];
                                }

                                outBuffer[45] = 0x00;

                                outBuffer[46] = 0x00; outBuffer[47] = 0x20; // RR_TYPE: NB
                                outBuffer[48] = 0x00; outBuffer[49] = 0x01; // RR_CLASS: IN

                                outBuffer[50] = 0x00; // TTL
                                outBuffer[51] = 0x0f;
                                outBuffer[52] = 0x0f;
                                outBuffer[53] = 0x0f;

                                outBuffer[54] = 0x00; outBuffer[55] = 0x06; // RDLENGTH

                                outBuffer[56] = 0x60; outBuffer[57] = 0x00; // NB_FLAGS

                                outBuffer[58] = IP[0];
                                outBuffer[59] = IP[1];
                                outBuffer[60] = IP[2];
                                outBuffer[61] = IP[3];

                                serverSocket.SendTo(outBuffer, remoteEndPoint);
                            }
                        }

                    }
                    Thread.Sleep(100);
                }
            }
        }

    }
}

To test this program, run it on emulator and try to ping NETDUINO with a computer connected on the same subnet.

Is it possible to change the configuration of lwIP to support udp local broadcast ?

Pascal

Why the ARM compiler provided with Embedded Compact 7 is not supported by .NET MF ? There is certainly a good reason, Just curious, Pascal

Hello, To simplify developing and debuging of some piece of firmware, I imagine to use the emulator. Due to very constrained environement, the price of RVDS, the size of code generated by GNU G++ and the size of debug information, it would be great if I can write/test/debug my native code with emulator before. As a example, for a IP stack , instead of using socket level with emulator, is it possible to strip this part, write a driver for WinpCap, and work on code between socket assembly and this driver with emulator ? Anyone have experience on this ? Any comments appreciate, Pascal

Hello Netduino Community, Some information about uIP, uIP is a very small open-source TCP/IP stack written by Adam Dunkels from Swedish Institude of Computer Science. Same author as original lwIP. This stack can run also on 8 bits MCU. The official uIP web site: http://www.sics.se/~...x.php/Main_Page This site is dedicated to the first version uIP and it support IPv4. In parallel, Adam Dunkels work on a mini OS named Contiki: http://www.sics.se/contiki/ In this mini-OS, you can see a more up-to-date version of uIP stack for IPv4 and IPv6. This stack is IPv6 ready. Compare to IPv6 support on lwIP which is experimental. It doesn't support Dual Stack, so you need to choice between IPv4 and IPv6. uIP can be used without Contiki. Here is a example of porting IPv6 uIP on Arduino without Contiki using a enc28j60 chip: http://sites.google....ipv6ethershield A little question to Netduino Community : What's your priority regarding porting IPv6 or IPv4 ? Regarding this, one very important information: If you plan to use low-power wireless like 802.15.4, IPv6 can be a good choice because of 6lowPAN. 6lowPAN use header compression to be compatible with 802.15.4. The dream is to be able to communicate with all devices, wire and wireless, simply by using IP. IPv4 over 802.15.4 is impossible due to low MTU size of 802.15.4 frame. Pascal