Posted by
Hi guys,
Thanks for the advice.
After splitting into various threads (like one for connecting to the wifi and another for handling the data send), as well as now using the Toolbox.HTTP_Client reference, I seem to have resolved a timeout causing the Netduino/wifly module to hang 
I have been able to run a test with over 700 HTTP Get requests and although there were a number of timeouts none of them caused the Netduino to hang/crash!!
Only problem I have now though is that I run out of memory... and I can't understand why, but I think that's for another thread!
Please find my code below (please ignore all the "Debug.GC(true);" lines as it's part of my efforts to figure out the memory issue) , I hope it helps someone else. Thanks to everyone for their input!!
using System;using System.Collections;using System.IO;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;using Microsoft.SPOT;using Microsoft.SPOT.Hardware;using SecretLabs.NETMF.Hardware;using SecretLabs.NETMF.Hardware.Netduino;using Toolbox.NETMF.Hardware;using Toolbox.NETMF.NET;namespace testToolbox21240{ public class Program { static uint intCounter = 0; static uint intTimeoutCounter = 0; static WiFlyGSX WifiModule; static string strWriteFile = "dataone"; static string strReadFile = "datatwo"; static ArrayList counterDataArray = new ArrayList(); public static void Main() { connectToWifi(); populateArray(); //httpSendData(); Thread.Sleep(Timeout.Infinite); } public static void populateArray() { Debug.Print("Populate array from: " + strReadFile); using (var filestream = new FileStream(@"SD" + strReadFile + ".txt", FileMode.Open)) { string strSendLine; StreamReader sr = new StreamReader(filestream); while ((strSendLine = sr.ReadLine()) != null) { counterDataArray.Add(strSendLine); } sr.Close(); sr.Dispose(); Debug.GC(true); } Debug.Print("send data from array"); foreach (string value in counterDataArray) { httpSendData(value); Debug.EnableGCMessages(true); } counterDataArray.Clear(); Debug.GC(true); cleanUp(); } public static void cleanUp() { if (strWriteFile == "dataone") { strWriteFile = "datatwo"; strReadFile = "dataone"; } else { strWriteFile = "dataone"; strReadFile = "datatwo"; } Debug.GC(true); Debug.Print("Free Memory: " + Debug.GC(true).ToString()); Debug.Print("Record count: " + intCounter); Debug.GC(true); populateArray(); } public static void connectToWifi() { //SimpleSocket Socket = new WiFlySocket("myURL.com", 80, WifiModule); //httpSendData(Socket); WifiModule = new WiFlyGSX(); WifiModule.EnableDHCP(); WifiModule.JoinNetwork("mySSID", 0, WiFlyGSX.AuthMode.MixedWPA1_WPA2, "myPassword"); Thread.Sleep(3500); // Showing some interesting output Debug.Print("Local IP: " + WifiModule.LocalIP); Debug.Print("MAC address: " + WifiModule.MacAddress); SNTP_Client TimeClient = new SNTP_Client(new WiFlySocket("ntp2.is.co.za", 123, WifiModule)); Thread.Sleep(500); TimeClient.Synchronize(); Thread.Sleep(500); Debug.Print("DateTime.Now: " + DateTime.Now.AddHours(2)); Thread.Sleep(3500); Debug.GC(true); } public static void httpSendData(string queryStringData) { SimpleSocket Socket = new WiFlySocket("myURL.com", 80, WifiModule); HTTP_Client WebSession = new HTTP_Client(Socket); try { HTTP_Client.HTTP_Response Response = WebSession.Get("/default.aspx?" + queryStringData); // Fetches a response header Debug.Print("value: " + queryStringData); Debug.GC(true); } catch (System.ApplicationException e) { Debug.Print("Error Code: " + e); intTimeoutCounter++; Debug.Print("intTimeoutCounter: " + intTimeoutCounter); using (var filestream = new FileStream(@"SDlog.txt", FileMode.Append)) { StreamWriter sw = new StreamWriter(filestream); sw.WriteLine("DateTime: " + DateTime.Now.AddHours(2) + "rnError Code: " + e + "rnintTimeoutCounter: " + intTimeoutCounter+ "rn"); sw.Flush(); sw.Close(); Debug.GC(true); } Thread.Sleep(1500); Debug.GC(true); httpSendData(queryStringData); } finally { Socket.Close(); //intCounter++; Debug.GC(true); } } }}
