gpsd support

[adriansmares]

References #105 (comment)

It would be nice if BasicStation would have the capacity to talk directly to a local gpsd instance, instead of requiring a background script that pushes the NMEA sentences via a FIFO. Most of the logic in gps.c would be virtually the same, as gpsd can output directly NMEA senteces (minus 3 initial sentences of garbage).

A minimal implementation could just use gpspipe -r in order to connect to the local gpsd instance and read to NMEA sentences, while a more robust implementation most likely would prefer to just open a pipe/local socket.

[jpmeijers]

I second this. It would definitely make the most sense to use gpsd, as that is the standard way of sharing a hardware GPS device on Linux.

Also gpsd has the ability to configure GPS receivers into the correct mode, and do some calculations like accuracy in meters.

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