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GSM : GPRS class

attachGPRS()

Description

Connects to the specified Access Point Name (APN) to initiate GPRS communication.

Every cellular provider has an Access Point Name (APN) that serves as a bridge between the cellular network and the internet. Sometimes, there is a username and password associated with the connection point. For example, the Bluevia APN is bluevia.movistar.es, but it has no password or login name.

This page lists a number of carrier's information, but it may not be up to date. You may need to get this information from your service provider.

Syntax

grps.attachGPRS(APN, user, password)

Parameters

  • APN : char array, the Access Point Name (APN) provided by the mobile operator
  • user : char array, the username for the APN
  • password : char array, the password to access the APN

Returns

ERROR, IDLE, CONNECTING, GSM_READY, GPRS_READY, TRANSPARENT_CONNECTED

Example

#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
  Serial.begin(9600);

  // connection state
  boolean notConnected = true;

  // Start GSM shield
  // If your SIM has PIN, pass it as a parameter of begin() in quotes
  while(notConnected)
  {
    if((gsmAccess.begin(PINNUMBER)==GSM_READY) &
        (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD)==GPRS_READY))
      notConnected = false;
    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() {


  // listen for incoming clients
  GSM3MobileClientService client = server.available();



  if (client)
  {  
    while (client.connected())
    {
      if (client.available())
      {
        Serial.println("Receiving request!");
        bool sendResponse = false;
        while(char c=client.read()) {
          if (c == '\n') sendResponse = true;
        }

     // if you've gotten to the end of the line (received a newline
     // character)
       if (sendResponse)
       {
          // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println();
          client.println("<html>");
          // output the value of each analog input pin
          for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
            client.print("analog input ");
            client.print(analogChannel);
            client.print(" is ");
            client.print(analogRead(analogChannel));
            client.println("<br />");      
          }
          client.println("</html>");
          //necessary delay
          delay(1000);
          client.stop();
        }
      }
    }
  }
}

 
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See Also

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The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.