Make this LoRa shield also compatible with T-SIM & T-CALL

[nikil511]

By adding LoRa to ESP32-GSM modem backed boards (T-SIM & T-CALL) you create a very powerful gateway for other LoRa sensors.

For example, you could have a few T-HiGrow+LoRa sensors, sending to T-SIM+LoRa which in turn uploads periodically to the cloud via NBIoT.

Additional, nice to have features:

• external RTC like T-Fox (ESP32 internal RTC is very inaccurate and you need a good RTC for synchronized sleep in WSN)
• MOSFETs or regulated power output for turning on/off external peripheral sensors.
• Solar charger (Maybe this could be combined with the MOSFET output above with a feature full power management chip ?)

[lewisxhe]

A T-SIM adaptation has been made, but T-Call does not. I will close the question, please reopen if there is still a problem