GSM

//SMS receiver

// libraries
#include <GSM.h>

  unsigned int Valor1;
  unsigned int Valor2;
  unsigned int index = 0;
  float desconto;
  float resul_desconto;

// PIN Number
#define PINNUMBER ""

// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;

char remoteNumber[20];  // Holds the emitting number

void setup()
{
  // initialize serial communications
  Serial.begin(9600);

  Serial.println("SMS Concessiornaria");

  // 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)
      notConnected = false;
    else
    {
      Serial.println("Não Conectado");
      delay(1000);
    }
  }

  Serial.println("GSM Inicializado");
  //Serial.println("Waiting for messages");
}

void loop()
{
  char c;

  // If there are any SMSs available()
  if (sms.available())
  {
    Serial.println("Mensagem Recebida");

    // Get remote number
    sms.remoteNumber(remoteNumber, 20);
    Serial.println(remoteNumber);

    // This is just an example of message disposal
    // Messages starting with # should be discarded
    if(sms.peek()=='#')
    {
      //Serial.println("Discarded SMS");
      sms.flush();
    }

    // Read message bytes and print them
   Serial.println("Voce Recarregou (R$):");
    while(c=sms.read())
    {
       index++;
       if (index == 1)
           Valor1 = c-48;
       if (index == 2)
       {
            Valor2 = c-48;
            Valor1 = Valor1*10;
            Valor1 = Valor1 + Valor2;
       }
       Serial.print(Valor1);
    }
    index = 0;
    //Serial.println("\nEND OF MESSAGE");

    // delete message from modem memory
    sms.flush();
    //Serial.println("MESSAGE DELETED");


    // Desconto do valor da msg

    int resul = int (c);

    desconto = (resul-5);
    resul_desconto = resul_desconto + desconto;

    Serial.print("Valor recebido com 5 reais descontado: ");
    Serial.println(desconto,10);
    Serial.print("Valor acumulado: ");
    Serial.println(resul_desconto,10);

  }

  delay(1000);

}