Arduino gsm shield issue

Tonderai,

   Do you have documentation on the proper usage of gsm.readSMS?

I don't.  But it seems odd to me that it would take as parameters two

uninitialized buffers, smsbuffer and n. 

Edited to add:   

   I think I found the documentation:

-     readSMS (char* msg, int msglength, char* number, int nlength) Checks if

there are available messages. Takes the first one and deletes it from modem

memory. Returns message in msg, and original phone number in “number”.

Msglength and nlength must hold the corresponding buffer size.

http://labs.arduino.cc/GPRS/Library

So your code looks OK to me.

But at the top of that documentation, it says:

"This page is outdated. For information on using the GSM library with the current GSM shield,

visit the GSM library reference pages.    http://arduino.cc/en/Reference/GSM

and at that page I don't see readSMS.

Thanks so much for the reply. After Arduino 1.0.5 or later gsm module come installed. The gsm library

I am using is found here https://code.google.com/p/gsm-shield-arduino/downloads/list

I dont know if the gsm library that comes with the new ide is compatible with the shield I am using

the brand of the arduino shield on the arduino site is different .

This is the one I am using: http://www.ebay.co.uk/itm/GSM-GPRS-Shield-For-Arduino-/230911052682?pt=LH_DefaultDomain_0&hash=item35c35f0b8a

At the bottom of the purchase page is a link to https://code.google.com/p/gsm-shield-arduino/downloads/list

thats why I an using it.

Thanks

Tonderai,

    If I read your original post correctly, the message isn't getting sent

at all, not just that your program can't retrieve the message.  Is that correct?

I believe there are lower-level modem commands besides sms.SendSMS

that can enable debugging modes that could give you clues about

what's going wrong. 

Okay.

I will look into that. The wierd thing is the print out says message sent but the phone does'nt get it.!

  if(started){

    //Enable this two lines if you want to send an SMS.

    if (sms.SendSMS("+444538590489", "Arduino SMS"))

      Serial.println("\nSMS sent OK");

  }

Dear Tonderai,

here is the simple code to send and receive sms through gsm sim900.

//receiving sms

void setup ()

{

Serial.begin(9600);

Serial.write("AT+CMGF=1\r");           //set GSM to text mode

delay(1500);

Serial.write("AT+CPMS=\"SM\"\r");      //Preferred SMS Message Storage

delay(1000);

Serial.write("AT+CMGR=1\r");

Serial.write("AT+CNMI=2,2,0,0,0\r");

delay(1000);        //list the first message from SIM //Memory

            while(1)

           {

                        if(Serial.available())

                        {

                                    Serial.write(Serial.read());

                        } 

          }

}

void loop()

{

}

//sending sms

void setup()

{

1. Serial.begin(9600);

delay(5000);

}

void loop()

{

Serial.println("AT");

delay(1000);

Serial.println("AT+CMGF=1");

delay(1000);

Serial.println("AT+CMGS=\"08792546229\""); //CHANGE TO //DESTINATION NUMBER

delay(1000);

Serial.print("hi...sms from arduino");

Serial.write(26);

delay(1000);

}

Dear Tonderai,

here is the simple code to send and receive sms through gsm sim900.

//receiving sms

void setup ()

{

Serial.begin(9600);

Serial.write("AT+CMGF=1\r");           //set GSM to text mode

delay(1500);

Serial.write("AT+CPMS=\"SM\"\r");      //Preferred SMS Message Storage

delay(1000);

Serial.write("AT+CMGR=1\r");

Serial.write("AT+CNMI=2,2,0,0,0\r");

delay(1000);        //list the first message from SIM //Memory

            while(1)

           {

                        if(Serial.available())

                        {

                                    Serial.write(Serial.read());

                        } 

          }

}

void loop()

{

}

//sending sms

void setup()

{

1. Serial.begin(9600);

delay(5000);

}

void loop()

{

Serial.println("AT");

delay(1000);

Serial.println("AT+CMGF=1");

delay(1000);

Serial.println("AT+CMGS=\"08792546229\""); //CHANGE TO //DESTINATION NUMBER

delay(1000);

Serial.print("hi...sms from arduino");

Serial.write(26);

delay(1000);

}