#include <Arduino.h> //Create software serial object to communicate with SIM900

#include <SoftwareSerial.h>
/* Create object named SIM900 of the class SoftwareSerial */
SoftwareSerial SIM900(6, 7);

int sleep = 500;
int msg = 0;

void showSerialData()
{
  Serial.println("Show serial data:");
  while (SIM900.available())
  {
    char c = SIM900.read();
    Serial.write(c);
  }
  Serial.println("");
}

void sendCommand(String command, int sl)
{
  SIM900.println(command);
  delay(sl);
  showSerialData();
}

void initGPRS(String command)
{
  SIM900.println("AT+SAPBR=0,1");                                     /* Close GPRS context */
  sendCommand("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"", sleep);            /* Connection type GPRS */
  sendCommand("AT+SAPBR=3,1,\"APN\",\"internet.beeline.ru\"", sleep); /* APN of the provider */
  sendCommand("AT+SAPBR=1,1", 2000);                                  /* Open GPRS context */
  sendCommand("AT+SAPBR=2,1", sleep);                                 /* Query the GPRS context */
  sendCommand("AT+HTTPINIT", sleep);                                  /* Initialize HTTP service */
  sendCommand("AT+HTTPPARA=\"CID\",1", sleep);                        /* Set parameters for HTTP session */
  sendCommand(command, sleep);                                        /* Set parameters for HTTP session */
  sendCommand("AT+HTTPACTION=0", 8000);                               /* Start GET session */
  msg = 2;
}

void checkRequest(String command)
{
  SIM900.println("AT+HTTPREAD");
  delay(10000);
  while (SIM900.available())
  {
    char result = SIM900.read();
    if (!result)
    {
      msg = 1;
      return;
    }
    Serial.write(result);    
  }
  msg = 3;
  Serial.println("");
}

void endSessionGPRS()
{
  sendCommand("AT+HTTPTERM", sleep);  // Terminate the HTTP service
  sendCommand("AT+CIPSHUT", sleep);   // close or turn off network connection
  sendCommand("AT+SAPBR=0,1", sleep); /* Close GPRS context */
  msg = 0;
}

void toMsg()
{
  int counter = 0;
  msg = 1;
  String url = "";
  String command = "AT+HTTPPARA=\"URL\",\"";
  url += "v-php.ru/ard?ard=";
  url += counter;
  url += "\"";
  command += url;
  Serial.println("BEGIN...");
  Serial.println(url);

  while (msg >= 1 && msg <= 3 && counter < 20)
  {
    if (msg == 1)
      initGPRS(command);
    if (msg == 2)
      checkRequest(command);
    if (msg == 3)
      endSessionGPRS();

    counter ++;
  }
}

void setup()
{
  SIM900.begin(9600); /* Define baud rate for software serial communication */
  Serial.begin(9600); /* Define baud rate for serial communication */
  toMsg();
}

void loop()
{
}