Arduino/hardware/arduino/avr/libraries/GSM/examples/Tools/TestWebServer/TestWebServer.ino

/*
  Basic Web Server
 
 A simple web server that replies with nothing, but prints the client's request
 and the server IP address.

 Circuit:
 * GSM shield attached
 
 created 
 by David Cuartielles
 modified 21 Nov 2012
 by Tom Igoe
 
 http://arduino.cc/en/Tutorial/GSMToolsTestWebServer
 
 This example code is part of the public domain
 */
 #include <GSM.h>

// PIN Number
#define PINNUMBER ""

// APN data
#define GPRS_APN       "GPRS_APN" // replace your GPRS APN
#define GPRS_LOGIN     "login"    // replace with your GPRS login
#define GPRS_PASSWORD  "password" // replace with your GPRS password


// initialize the library instance
GPRS gprs;
GSM gsmAccess;     // include a 'true' parameter for debug enabled
GSMServer server(80); // port 80 (http default)

// timeout
const unsigned long __TIMEOUT__ = 10*1000;

void setup()
{
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.println("starting,..");
  // connection state
  boolean connected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while(!connected)
  {
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
        (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
      connected = true;
    else
    {
      Serial.println("Not connected");
      delay(1000);
    }
  }

  Serial.println("Connected to GPRS network");

  // start server
  server.begin();

  //Get IP.
  IPAddress LocalIP = gprs.getIPAddress();
  Serial.println("Server IP address=");
  Serial.println(LocalIP);
}

void loop(){
  GSMClient client = server.available();
  
 if (client) {
   if (client.available()) {
    Serial.write(client.read()); 
   }
}

}