I'm programming an app to send SMS through a GSM modem with the serial port. I've been able to send SMS for a couple of days using the MessagingToolkit library but suddennly I'm not being able to send SMS anymore.
According to the logs this is due to a Network error. I found out that the "standard" error that I'm facing is:
CMS ERROR: 512 User abort
I found a list of error codes here http://www.smssolutions.net/tutorials/gsm/gsmerrorcodes/ but I can't find any further explanation on the error.
Does anyone that's familiar with GSM knows what's this error about?
When I'm initializing the modem I also get this error message from the starting configurations, it might be related to the 512 error:
2011.04.11-09.23.16: Sending: AT+COPS=0,2
2011.04.11-09.23.17: Error in command AT+COPS=0,2 : ERROR
Thanks!
Best Answer
Have you verified that you are registered with your operator properly? You can do this by sending a AT+CREG?
Regarding the AT+COPS error message. It seems like you aren't sending enough parameters.
AT+COPS=<mode>,[<format>,<oper>[,<AcT>]]
Are you trying to manually select an operator rather than letting the modem take the default operator setup with the SIM card?