Add new module ESP-Modem

[ezampi]

Hello,

I'm trying to use the esp-modem component to create a PPP channel and then use the MQTT protocol to send data.
The example "PPPoS_client" (https://github.com/espressif/esp-protoc ... pos_client) shows how to create a PPPoS channel on which activate the MQTT client, the problem is that my NB-IoT module (SIMCOM 7020 or 7028) is not supported. This components supports SIMCOM 7070, 7000 and 7600, which, however, have different AT commands.

The component offers the possibility of extending compatibility to other modules, but the documentation and example are not very friendly.
Has anyone already tried adding a custom module?

Thanks