Arduino GSMShield

Question

I've been working on a project with arduino UNO and GSM Shield.

I'm uploading to Internet data every 30 minutes from a maxbotix sensor. Code hangs and loops continuously with the serial monitor showing gsm.begin() waiting for reply.

I have read very carefully all the related forums and rewrote the library file GSM3ShieldV1AccessProvider.cpp as per http://forum.arduino.cc/index.php?topic=233137.0

Unfortunatelly this doesn't solve the problem. With gsm debug set to true it stucks on the the infamous AT%13% (post http://forum.arduino.cc/index.php?topic=233137.0)

This is driving me mad as it ruins the whole project. Anyone has find a workaround?

Answer 1

If Arduino stucks at this point that's because the modem is answering with ERROR to the AT command and it doesnt continue to AT+CPIN, AT+CGREG ... So, obviously it's not a SIMcard problem neither a APN problem

Have you try to update the GSM library? Please, show me the debug log you are getting

GSM gsmAccess(1);