SIM900 function

Projects Networking, Protocols, and Devices
1

Hi.
Based on the function found here http://www.cooking-hacks.com/documentation/tutorials/arduino-gprs-gsm-quadband-sim900

int8_t sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout){

    uint8_t x=0,  answer=0;
    char response[100];
    unsigned long previous;

    memset(response, '\0', 100);    // Initialice the string

    delay(100);

    while( Serial.available() > 0) Serial.read();    // Clean the input buffer

    Serial.println(ATcommand);    // Send the AT command 


        x = 0;
    previous = millis();

    // this loop waits for the answer
    do{
        // if there are data in the UART input buffer, reads it and checks for the asnwer
        if(Serial.available() != 0){    
            response[x] = Serial.read();
            x++;
            // check if the desired answer is in the response of the module
            if (strstr(response, expected_answer) != NULL)    
            {
                answer = 1;
            }
        }
        // Waits for the asnwer with time out
    }while((answer == 0) && ((millis() - previous) < timeout));    

    return answer;
}

which
1 .Sends AT commands to SIM900 module
2. Reading the answer
3. Comparing them to the expected answer
4. Return 1 or 0 depending if the answer was correct or wrong.

I would like to modify this function in order to receive the actual responce also .
Something like
return ( 1 or 0 , responce)
or whatever is posible in order to use that responce later in my code.

Can be done ?
Could you please guide me on how to do it ?

Thank you in advance

2

The following code seems that is working ..

String sendATcommand(char* ATcommand, char* expected_answer, unsigned int timeout){

  uint8_t x=0,  answer=0;
  char response[100];
  unsigned long previous;
  String reply = "";
  memset(response, '\0', 100);    // Initialize the string

  delay(100);

  while( SIM900.available() > 0) SIM900.read();    // Clean the input buffer

  SIM900.println(ATcommand);    // Send the AT command 
 // Serial.println(ATcommand);

  x = 0;
  previous = millis();

  // this loop waits for the answer
  do{
    if(SIM900.available() != 0){    
      // if there are data in the UART input buffer, reads it and checks for the asnwer
      response[x] = SIM900.read();
      x++;
      // check if the desired answer  is in the response of the module

      //Serial.println(response);

      if (strstr(response, expected_answer) != NULL)    
      {
        answer = 1;
      }
    }
    // Waits for the asnwer with time out
  }
  while((answer == 0) && ((millis() - previous) < timeout));   
  
  reply +=answer ;
  reply += " , ";
  reply += response;
 
   return reply;
  //reply = (answer + "#" + response);
}

Please verify that there is NO ERROR in the above function