Thanks for the help but,

Unfortunately the above reset function does not work. The code will reset and go back to the beginning on the program however, it will not reconnect to the WiFi network once the Arduino gets to that line of code. 

Hi, guys

I would like to be able to reset my Arduino WiFi Shield when the connection is dropped. I am currently using an Arduino R3 board. I have used the below procedure this works in resetting to the beginning of code however the WiFi Shield does not want to connect again after this code is run and I must re-upload the sketch

I call the function softReset when connection fails, this restarts arduino to beginning of sketch

void softReset(){
asm volatile ("  jmp 0");
}

then I use http://arduino.cc/en/Tutorial/EEPROMClear , to clear memory (1024 because arduino has this much eeprom http://arduino.cc/en/Main/arduinoBoardUno

for (int i = 0; i < 1024; i++)
    EEPROM.write(i, 0);

As some of you must know that use the WiFi shield there is an issue where the shield drops the TCP connection after about 2 seconds this makes building projects very very annoying. I still have not been able to get around this issue. Can anyone help by pointing out some heartbeat code that will keep the connection alive indefinitely.

Some background info if you dont know what I am talking about.

http://arduino.cc/forum/index.php/topic,128424.0.html

I want to fix this issue by recycling the last input from client.read() if no new input is present.

My goal is to reuse the previous input if no new input is present on client.read() the issue right now is the code requires new data on client.read() or it will not continue.

Hi, Guys
I have a simple issue where if my code does not receive any input from client.read() every second the session will disconnect because of a TCP timeout protocol. I want to fix this issue by recycling the last input from client.read() if no new input is present. Does anyone know how I could possibly accomplish this?

PS. I have done alot of research into threads for arduino however, am unsure how to implement.

Code:

/*
  2012/2013 Capstone Project
  Wireless Smart Lighting
  Arduino Submodule

  Circuit:
  * WiFi shield attached
 
*/

#include <SPI.h>
#include <WiFi.h>

#define MAX_CMD_LENGTH 25
const int ledPin =  6;      // the number of the LED pin
String cmd;
WiFiClient client;
boolean connected = false;
int values[] = {0,10,20,30,40,50,60,70,80,90,100};

char ssid[] = "S3"; //  your network SSID (name)
char pass[] = "zxcvzxcv";    // your network password (use for WPA, or use as key for WEP)

//int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {   
  // initialize the pushbutton pin as an input:
  pinMode(ledPin, OUTPUT);
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while(true);
     
  }
  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:   
    status = WiFi.begin(ssid,pass);

    // wait 10 seconds for connection:
    delay(1000);
  }
  // start the server:
  server.begin();
  // you're connected now, so print out the status:
  printWifiStatus();
 }

void loop() {
  // wait for a new client:
  WiFiClient client = server.available();

  // when the client sends the first byte, say hello:
  if (client) {
    if (!alreadyConnected) {
      // clead out the input buffer:
      client.flush();   
      Serial.println("We have a new client");
      client.println("Hello, client!");
      alreadyConnected = true;
    }
    while (client.available() > 0) {
     
      readTelnetcommand(client.read());
    }
  }
}

void readTelnetcommand(char c){
  if(cmd.length() == MAX_CMD_LENGTH) {
      cmd = "";
  }
  cmd+=c;
 
  if(c == '\n') {
    if(cmd.length() > 2) {
      // remove \r and \n from the string
      cmd = cmd.substring(0,cmd.length() - 2);
      parseCommand();
    }
  }
}

void parseCommand() {
  int value = cmd.toInt();
  int n;

  if(cmd.equals("quit")) {
        client.stop();
        connected = false;
   } else if(cmd.equals("help")) {
        server.println("--- Telnet Server Help ---");
        server.println("on    : switch on the Main Power");
        server.println("off   : switch off the Main Power");
        server.println("quit  : close the connection");
   } else if(cmd.equals("on")) {
        analogWrite(ledPin, 255);
        server.print("\t");   
        server.println("LED on.");
   } else if(cmd.equals("off")) {
        analogWrite(ledPin, 0);
        server.print("\t");   
        server.println("LED off.");
   } else if(cmd.equals("fade")){
        for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) {
        // sets the value (range from 0 to 255):
        analogWrite(ledPin, fadeValue);         
        // wait for 30 milliseconds to see the dimming effect   
        delay(30);                           
   }
   } else {
       for (n=0;n<11;n++){
       if(value==values[n]){
       int fadeamount =value*2.5;
       analogWrite(ledPin,fadeamount);
       server.print("\t");     
       server.write("Diming Level(0-100): ");
       server.print(values[n]);
       server.println();
       }
  }
  }
  cmd = "";
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

Hi, Guys

I am having some issue with my Arduino UNO R3, and the Arduino WiFi shield. I am trying to turn on a simple LED using the shield however, i get almost no current out of any digital pin that i use. I am not using pins 10-13, and 7 all other pins are same issue. I get 5volts out however when load is attached the voltage drops and i get very low current no where near 20mA.

Code:

/*
  2012/2013 Capstone Project
  Wireless Smart Lighting
  Arduino Submodule

  Circuit:
  * WiFi shield attached
 
*/

#include <SPI.h>
#include <WiFi.h>
#define MAX_CMD_LENGTH 25
const int ledPin =  2;      // the number of the LED pin
String cmd;
WiFiClient client;
boolean connected = false;

char ssid[] = "name"; //  your network SSID (name)
char pass[]="password";
//char pass[] = "secretPassword";    // your network password (use for WPA, or use as key for WEP)

//int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(23);

boolean alreadyConnected = false; // whether or not the client was connected previously

void setup() {   
  // initialize the pushbutton pin as an input:
  pinMode(ledPin, INPUT);
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }
  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while(true);
     
  }
  // attempt to connect to Wifi network:
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network. Change this line if using open or WEP network:   
    status = WiFi.begin(ssid,pass);

    // wait 10 seconds for connection:
    delay(1000);
  }
  // start the server:
  server.begin();
  // you're connected now, so print out the status:
  printWifiStatus();
 }

void loop() {
  // wait for a new client:
  WiFiClient client = server.available();

  // when the client sends the first byte, say hello:
  if (client) {
    if (!alreadyConnected) {
      // clead out the input buffer:
      client.flush();   
      Serial.println("We have a new client");
      client.println("Hello, client!");
      alreadyConnected = true;
    }
    while (client.available() > 0) {
      readTelnetcommand(client.read());
      /*
      char thisChar = client.read(); 
      String clientText(thisChar);
      if(strcmp(thisChar,"on")){
        digitalWrite(ledPin, HIGH);
        Serial.write("Turn LED on. ");
        Serial.write("\n");
        client.println("\n");
        client.println("Turn LED on. ");
      }
      if(strcmp(clientText,"off")){
        digitalWrite(ledPin, LOW);
        Serial.write("Turn LED off. ");
        Serial.write("\n");
        client.println("\n");
        client.println("Turn LED off. ");                             
        //int text_val = clientText.compareTo("0");     
      }
      */
    }
  }
}

void readTelnetcommand(char c){
  if(cmd.length() == MAX_CMD_LENGTH) {
      cmd = "";
  }
  cmd+=c;
 
  if(c == '\n') {
    if(cmd.length() > 2) {
      // remove \r and \n from the string
      cmd = cmd.substring(0,cmd.length() - 2);
      parseCommand();
    }
  }
}

void parseCommand() {

  if(cmd.equals("quit")) {
      client.stop();
      connected = false;
  } else if(cmd.equals("help")) {
      server.println("--- Telnet Server Help ---");
      server.println("on    : switch on the Main Power");
      server.println("off   : switch off the Main Power");
      server.println("quit  : close the connection");
  } else if(cmd.equals("on")) {
      digitalWrite(ledPin, HIGH);
      server.println("LED on.");
   } else if(cmd.equals("off")) {
      digitalWrite(ledPin, LOW);
      server.println("LED off.");
  } else {
      server.println("Invalid command, type help");
  }
  cmd = "";
}

void printWifiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

That file is for programming a WiShield. Unfourtunately I dont have the programming skill to convert.

Hi, Guys

Can one of you lead me in the right direction where I can set up a socket server with an Uno using a WiFi Shield.
I would like to implement something like the following project. However, this example doesn't post its Arduino Sketch.
http://www.instructables.com/id/How-to-build-an-Arduino-WiFi-4x4-with-Android-Cont/?ALLSTEPS

If any of you have some code snippets of how to implement such a design it would be of assistance.

My main goal is to get an Android device to communicate with the shield. Willing to pay for some good resources. Message me.