AT+CELLIST command

[dslc]

Hi. First of all: Thank you for this excellent module!

I am wondering if you are willing to add support for the AT+CELLIST command. This is available in SIM800 devices at least (other ones I am not sure), and returns statistics about GSM cells - such as country code (MCC), network code (MNC), etc.. This information is required in the AIS 140 protocol.

I forked your repository and added experimental support for this command in a development branch - at https://github.com/dslc/GSM_AT_Lib/tree/nmr-api .

Maybe you have already considered this issue and there is a reason you have chosen not to support this feature. In any case ... I would be interested in your thoughts.