[RFC] Unmanaged GPS setup / location source

[Aleksander Morgado]

Hey,

I've been asked whether it would make sense to allow having
ModemManager control the status of the GPS module in a device, *but*
leaving the tty where the NMEA traces are dumped untouched. This would
allow to integrate with other standard GPS applications which read
from a tty, while leaving MM the control over when to enable/disable
the GPS module.

Any comments on this?

I have a draft implementation (mmcli commands not yet done) already in
the 'aleksander/gps-unmanaged' branch in upstream git, where I just
define a new MM_MODEM_LOCATION_SOURCE_GPS_UNMANAGED source. When this
source is enabled, GPS module is started but the GPS tty is not used.
Of course, the implementation also forbids trying to enable unmanaged
and raw/nmea GPS at the same time. Also, currently only done for
Option/HSO (the only plugin which does GPS over a tty for now). I may
add GPS support for Cinterion one of these days as well.

-- 
Aleksander
https://aleksander.es