7 replies to this topic

[samjones]

So once in awhile, netduino can't get on the network,
Soooo, how can I, in code, re-init the enet on such an exception?

Ideally, I can do this in line in the code, so I can keep the debugger attached.

But if a reboot is needed, so be it... tell me how to do that from code....

thx!!

Example of exception below:

'System.Net.Sockets.Socket.Send'
    #### Exception System.Net.Sockets.SocketException - CLR_E_FAIL (1) ####
    #### Message: 
    #### Microsoft.SPOT.Net.SocketNative::send [IP: 0000] ####
    #### System.Net.Sockets.Socket::Send [IP: 0018] ####
    #### System.Net.Sockets.NetworkStream::Write [IP: 0051] ####
    #### System.Net.InputNetworkStreamWrapper::Write [IP: 000a] ####
    #### System.Net.HttpWebRequest::SubmitRequest [IP: 0077] ####
    #### System.Net.HttpWebRequest::GetResponse [IP: 000c] ####
    #### NetduinoPlusApplication1.Program::ProcessRequest [IP: 0016] ####
    #### NetduinoPlusApplication1.Program::GetBusStatus [IP: 0005] ####
    #### NetduinoPlusApplication1.Program::Main [IP: 004c] ####
    #### SocketException ErrorCode = 10054
    #### SocketException ErrorCode = 10054
A first chance exception of type 'System.Net.Sockets.SocketException' occurred in Microsoft.SPOT.Net.dll
    #### SocketException ErrorCode = 10054
    #### SocketException ErrorCode = 10054

[Valkyrie-MT]

You could put a try/catch around your code and in the catch call PowerState.RebootDevice -Valkyrie-MT

[ColinR]

The trouble you will face is that sometimes the exception is genuine, and sometimes it's due to the networking stack needing a reboot. The method I implemented in the end was an exception count, where after x exceptions, reboot.

[samjones]

Colin, Is there a class out there to easily log exceptions to the sd card? I want to get a picture of what is going on when I am at work.... Thoughts? Thx!

[Arbiter]

I wonder would it suffice to release and renew?

NetworkInterface.GetAllNetworkInterfaces()[0].ReleaseDhcpLease();
      NetworkInterface.GetAllNetworkInterfaces()[0].RenewDhcpLease();

[ColinR]

Is there a class out there to easily log exceptions to the sd card?

Just wrap your code in try catch blocks and call WriteLog(exception.ToString());

private static void WriteLog(string log)
{
    try
    {
        var fs = new FileStream(@"\SD\log.txt", FileMode.Append, FileAccess.Write, FileShare.Read, 512);
        var sw = new StreamWriter(fs);
        sw.WriteLine(DateTime.Now.ToString(DateFormat) + ": " + log.Trim());
        sw.Flush();
        sw.Close();
    }
    catch { }
}

I wonder would it suffice to release and renew?

Unfortunately not according to my tests.

[Arbiter]

I built an app that responds to the NetworkAddressChanged event by creating a TCP socket, connecting it to the echo service on port 7, writing "FUBAR" and reading it back into a buffer that it displays with Debug.Print(). This app totally failed to manifest the problem when I power cycle the wireless 3G router to which my N+ is connected.

On the app I have under development, this causes 10055 on the second pass.

Believing it to be a memory shortage, I constructed this

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

namespace NetworkExercise
{
  public class Program
  {
    static bool isNetworkAvailable = false;
    static byte[] rampig = new byte[15360];

    public static void Main()
    {
      NetworkChange.NetworkAddressChanged += NetworkChange_NetworkAddressChanged;
      NetworkChange.NetworkAvailabilityChanged += NetworkChange_NetworkAvailabilityChanged;
      Thread.Sleep(Timeout.Infinite);
    }

    static void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
    {
      isNetworkAvailable = e.IsAvailable;
      Debug.Print(DateTime.UtcNow.ToString("u") + " " + (isNetworkAvailable ? "ONLINE" : "OFFLINE"));
    }

    static void NetworkChange_NetworkAddressChanged(object sender, EventArgs e)
    {
      if (isNetworkAvailable)
      {
        var na = NetworkInterface.GetAllNetworkInterfaces()[0];
        Debug.Print(na.IPAddress.ToString());
        Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        var ep = new IPEndPoint(Dns.GetHostEntry("whitehouse.podzone.net").AddressList[0], 7);
        socket.Connect(ep);
        socket.Send(Encoding.UTF8.GetBytes("FUBAR"));
        byte[] buf = new byte[5];
        Thread.Sleep(100);
        socket.Receive(buf);
        Debug.Print(new string(Encoding.UTF8.GetChars(buf)));
      }
    }
  }
}

Rather surprisingly. this runs without a hitch. Increase rampig by 1K and it doesn't even get off the starting block.

[mohammad]

This link might be useful to reboot the Netduino Plus by software http://forums.netdui...lus/#entry49735

 

Good Luck,

Mohammad