/*
  Sim900 is an Arduino library for working with the Sim900 GRPS Shield
  Copyright (C) 2012  Nigel Bajema

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#include <SoftwareSerial.h>
#include <Sim900.h>


CONN settings;
// pins 10, and 11 are serial rx and tx pins for the modem
// pin 9 is the power toggle pin
// analog pin 8 is the GRPS power status pin
Sim900 modem(new SoftwareSerial(10, 11), 19200, 9, 8, VARIANT_2);
char url[] = "www.example.com";

void setup()
{
  Serial.begin(19200);             // the Serial port of Arduino baud rate.
  delay(2000);
  settings.cid = 1;
  settings.contype = "GPRS";
  settings.apn = "internet";
  test_modem();
  
}


void loop()
{
}

void test_modem()
{
  int cid = 0, code = 0, error_code = 0;  
  uint32_t  length = 0;
  
  if(modem.powerUp())
  {
      Serial.println("Powered Up") ;
      Serial.println("=================================================");
      int strength = -1, error_rate = -1;      
      if(modem.getSignalQuality(strength, error_rate))
      {
        Serial.print("Strength: ");
        Serial.print(strength);
        Serial.print(" Error Rate: ");
        Serial.println(error_rate);        
      }
      GPRSHTTP* con = modem.createHTTPConnection(settings, url);
      if(con == NULL)
      {
          Serial.println(get_error_message(modem.get_error_condition()));
          return;
      }
      if(con->init() && con->post_init(14))
      {
        con->println("Hello World!");
        if(con->post(cid, code, length))
        {
          Serial.print("HTTP CODE: ");
          Serial.println(code, DEC);  
          Serial.print("Length: ");   
          Serial.println(length, DEC);     
          if(con->init_retrieve())
          {     
            length = length + 1;    //Trigger an error condition.
            char data[length + 1];  //Ensure that this is a NULL Terminated String....
            data[length] = '\0';    //....
            if(con->read(data, length))
            {
              Serial.println("Retrieved Data:");
              Serial.println(data);
            }
            if(con->get_error_condition() == SIM900_ERROR_READ_LIMIT_EXCEEDED)
            {
                Serial.println("We tried to Read more characters from the connection than were available!");
            }
          }
        }
      }
      con->terminate();
      delete con;
      Serial.println("------------------------------------------------");
  }else
  {
     Serial.println("Powering up modem failed !"); 
  }
  modem.powerDown(); 
}