Bi-directional SMS

[axis7818]

to allow the handset to communicate with the flight controller. Start by logging SMSs sent to the drone's root IMSI. though eventually it would be nice to either:

1. response to these messages through the flight controller
2. or designate a specific IMSI in sar.conf to the SAR team's communication handset.

i'm leaning towards the first option since the second would require that designated handset to stay in signal range of the BTS.

[anthturner]

I agree with going with option 1. I'd like to keep this as centralized to the flight controller as possible to minimize the number of moving parts.

[axis7818]

SMS routing is working for handsets in the network, we just need to tie the communication in with the OCP and flight controller.

[axis7818]

done!