Roaming Problem for mqtt using gsm sim 800 modem


#1

hello,
i had written code to send data over mqtt using sim800l modem and while developing i have used vodafone 3G sim card and it was working properly but later i moved here in a new state and used different sim (airtel 4G of older state) and it is having a problem now.
please tell me a solution of this problem, if roaming is a problem then is there any AT command to enable roaming or there is any modification needed to make ??


#2

Hi Sunil,
The modules get auto registered even on roaming. Your SIM card must be enabled for roaming, which most of the SIM cards are by default.

Only difference is AT+CREG? will give you +CREG: 0,5 instead of +CREG: 0,1 indicating that it is registered in roaming mode.