I am using SIM900 GSM module which connected with Arduino MEGA 2560. When I send the following command (AT+SAPBR=3,1,"CONTYPE","GPRS") to set up connection type of GPRS, I got response "ERROR".
Command sequences that I send are here:
**Commands are here** **Responses are here**
// See if the SIM900 is ready
// SIM card inserted and unlocked?
AT+CPIN? +CPIN: READY
// Is the SIM card registered?
AT+CREG? +CREG: 0,1
// Is GPRS attached?
AT+CGATT? +CGATT: 1
// Check signal strength - should be 9 or higher
AT+CSQ +CSQ: 14,0
// Set connection type to GPRS
Could you please help to understand what is the issue? Note that I checked SMS and RING and that works fine. the problem is only related to the mentioned command.
i solved this by deleting (") s in the line like and writing contype and gprs in capital letters. you can send this via terminal