Implement Message Access Profile (SMS)

[pzmarzly]

iOS supports MAP 1.1 over Bluetooth Classic. Right now BlueZ will connect to device over LE and Classic at the same time (BlueZ default, can be reconfigured in system setting file), so that's most of the work done.

We may want to only implement sending a message at first, since we can already receive it as a notification over ANCS. If an user has Messages notifications silenced out, it's a very niche edge case that we may want to support one day but perhaps not yet.

If someone wants to work on it: I think a good course of action would be to create a new daemon ancs4linux-sms, similar to ancs4linux-advertising, which will take calls over D-Bus and send SMSes. Then just add a new option to the CLI.

[otisdog8]

I'm potentially interested in working on this - do you have any starting point for good documentation resources?