Expose AT+ADR and other useful entry points

[xoseperez]

Adaptative Data Rate allows the device to modulate SF and BW depending on the signal strength from the gateway. This usually means better packet reception and/or less time on air, thus allowing for more packets per hour/day. This method could be added to the public section of the library.

  bool setADR(bool adr) {
    sendAT(GF("+ADR="), adr);
    if (waitResponse() != 1) {
      return false;
    }
    return true;
  }

It will also be useful to be able to set DR, FCU and get FCU, FCD, RSSI and SNR. Is there a way to get the actual DR used to transmit (SF/BW combination)? This way we could calculate the true time on air for the transmission and schedule the next one within the fair access policy for TTN (30s/day).

[facchinm]

Wow, there so much interesting stuff out there! I'll take a closer look at the Murata firmware documentation, understand what we can port to use the same underlying AT functions and expose them.
If there is no such chance, I'd be very happy if you have any proposal of specific combined APIs (like the fair access policy for TTN). Thanks!