Use Arduino GSM/GPRS shield to send data to my web service

Question

I know how to make calls and send SMSes using a GSM/GPRS shield for Arduino Uno. But I have a web service at the location http://mydomain.com/rest/receiveSensorData, and I want to send sensor data to this URL using a GSM/GPRS shield because I can not count on Wi-Fi being present at the operating locations. This is the shield I have, and I also have a 3G SIM card and am running on an Arduino Uno.

How do I do this?

CrypTech Studios CrypTech Studios · Accepted Answer · 2013-02-23T13:31:11

You probably already got this working but just in case:

In my setup I'm using the Seeed Quad Band GPRS Shield that uses the Sim900 module. I believe this code will work with yours as well after looking at the specs for yours.

    #include <SoftwareSerial.h>
SoftwareSerial gprsSerial(7, 8);

void setup()
{
  gprsSerial.begin(19200);
  Serial.begin(19200);

  Serial.println("Config SIM900...");
  delay(2000);
  Serial.println("Done!...");
  gprsSerial.flush();
  Serial.flush();

  // attach or detach from GPRS service 
  gprsSerial.println("AT+CGATT?");
  delay(100);
  toSerial();


  // bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
  delay(2000);
  toSerial();

  // bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"epc.tmobile.com\"");
  delay(2000);
  toSerial();

  // bearer settings
  gprsSerial.println("AT+SAPBR=1,1");
  delay(2000);
  toSerial();
}


void loop()
{
   // initialize http service
   gprsSerial.println("AT+HTTPINIT");
   delay(2000); 
   toSerial();

   // set http param value
   gprsSerial.println("AT+HTTPPARA=\"URL\",\"http://YOUR.DOMAIN.COM/rest/receiveSensorData?sensorval1=blah&sensorval2=blah\"");
   delay(2000);
   toSerial();

   // set http action type 0 = GET, 1 = POST, 2 = HEAD
   gprsSerial.println("AT+HTTPACTION=0");
   delay(6000);
   toSerial();

   // read server response
   gprsSerial.println("AT+HTTPREAD"); 
   delay(1000);
   toSerial();

   gprsSerial.println("");
   gprsSerial.println("AT+HTTPTERM");
   toSerial();
   delay(300);

   gprsSerial.println("");
   delay(10000);
}

void toSerial()
{
  while(gprsSerial.available()!=0)
  {
    Serial.write(gprsSerial.read());
  }
}

Just change "epc.tmobile.com" to the apn for your carrier and "YOUR.DOMAIN.COM" to your server info and change the "sensorval1=blah" to your variable and sensor data.

Let me know if you get this working or not. I can help you figure it out it's not too hard.

Good Luck.

Use Arduino GSM/GPRS shield to send data to my web service

2 Answers