Cannot send SMS with SIM900

[garreb]

Hi,

I have a problem sending SMS with SIM900 i can make a call but there is an Error when i tried to send SMS.

AT+CMGF=1

OK
AT+CMEE=1

OK
AT+CMGS="+41xxxxxxxxxx"

+CME ERROR: 765
testettt


Thanks

[vlp_arduino]

Could you test with the function written into the wiki:

Code: [Select]

void SendTextMessage()
{
  mySerial.print("AT+CMGF=1\r");    //Because we want to send the SMS in text mode
  delay(100);
  mySerial.println("AT + CMGS = \"+86138xxxxx615\"");//send sms message, be careful need to add a country code before the cellphone number
  delay(100);
  mySerial.println("A test message!");//the content of the message
  delay(100);
  mySerial.println((char)26);//the ASCII code of the ctrl+z is 26
  delay(100);
  mySerial.println();
}

[garreb]

Hi thanks for the answers i really have the same code and still the same problem (CME ERROR code 765 )

I tried with two SIM CARD in Switzerland.

I tried ao empty the sms stored in the SIM (mySerial.println("AT+CMGD=1,4")


I really block


Thanks for your help

[Jackman]

I see it at the SIM900_AT_Command_Manual_V1.03.pdf.page 218,it says that <code 765 > means <Invalid  input value>.
you can download this PDF here, http://www.elecrow.com/wiki/images/a/a8/SIM900_AT_Command_Manual_V1.03.pdf

So maybe you can change a micro-controller to have a try again, or some basic problems happened when operate the Arduino IDE.

[tabies]

You should paste your complete code, so we can know where and what the wrong.

[RAK_SOLO]

Friends,

Thanks for this thread.  I've been active in this area lately and found that if you are in text mode and try to send more than 160 characters in a single text, you get the nasty 765 error. 

I think, but don't know for sure, that there is some internal buffer limit on an outbound text, and after that is exceeded, the next thing it expects is Cntrl-Z -- so if you keep feeding it characters, it doesn't get that Cntrl-Z and claims that the input is "invalid input value."

This explanation of 765 ("invalid input value") initially sent me down the wrong path, by the way: I use all kinds of characters like !@#$% and was even using a newline in my texts -- but I tested all those including the newline: no problem.

Check for buffer overrun on your tx.  Best wishes,

~~ Robert