GPRSprogram

#include <SoftwareSerial.h>
#include <String.h>
 
SoftwareSerial gprsSerial(7, 8);
void setup(){
  gprsSerial.begin(19200);   // the GPRS baud rate   
  Serial.begin(19200);           // the GPRS baud rate 
  delay(500); 
  }
void loop(){
    if (Serial.available())
    switch(Serial.read())
   {
      case 'h':
      SubmitHttpRequest();
      break;  
    } 
  if (gprsSerial.available())
    Serial.write(gprsSerial.read());  
  }

///SubmitHttpRequest()
///this function is submit a http request
///attention:the time of delay is very important, it must be set enough 
void SubmitHttpRequest(){
  gprsSerial.println("AT+CSQ");
  delay(100);
  ShowSerialData();// this code is to show the data from gprs shield, in order to easily see the process of how the gprs shield submit a http request, and the following is for this purpose too.
  
  gprsSerial.println("AT+CGATT?");
  delay(100);
  ShowSerialData();
 
  gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");//setting the SAPBR,   the connection type is using gprs
  delay(1000);
  ShowSerialData();
 
  gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"CMNET\"");//setting the APN, the second need you fill in your local apn server
  delay(4000);
  ShowSerialData();
 
  gprsSerial.println("AT+SAPBR=1,1");//setting the SAPBR, for detail you can refer to the AT command mamual
  delay(2000);
  ShowSerialData();
 
  gprsSerial.println("AT+HTTPINIT"); //init the HTTP request
  delay(2000); 
  ShowSerialData();
 
  gprsSerial.println("AT+HTTPPARA=\"URL\",\"http://198.74.52.26/map.php?lat="+lat+"&lon="+lon+"\"");// setting the httppara, the second parameter is the website you want to access
  delay(1000);
  ShowSerialData();
 
  gprsSerial.println("AT+HTTPACTION=0");//submit the request 
  delay(10000);//the delay is very important, the delay time is base on the return from the website, if the return datas are very large, the time required longer.
  //while(!mySerial.available());
  ShowSerialData();
 
  gprsSerial.println("AT+HTTPREAD");// read the data from the website you access
  delay(300);
  ShowSerialData();
 
  gprsSerial.println("");
  delay(100);  
  }

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