configurable GPS baud rate

[d33psky]

The default (old) GPS units talk at 9600 baud
The newer UBlox-10 GPS series talk at 115200 baud
This PR adds a menu item to select between these 2 speeds and it updates the gpsd configuration in /etc/default/gpsd, and restarts the daemon on change, irrespective of whether UBLOX or classic GPSd is selected so that both will work.

[mrosseel]

hi, just a question - is it a good idea to make the baud rate configurable by the user? Maybe it's better to package this baud rate in with the selection of the GPS chip. Only devs will need to change it to test some things. What do you think?

[d33psky]

Yeah I've thought of that as well.
Ideally we can easily detect all the various units but afaik we do not have that (yet).

The "GPS Type" menu lists

• GPSD (generic)
• UBlox

Both can have 9.6k and 115k2 devices.

We could extend it like this :

• GPSD 9600 (generic)
• GPSD 115200 (generic)
• UBlox 9600
• UBlox 115200

But that looks messy too.

Maybe we should rename the "GPS Baud Rate" menu to "GPS chip" to enumerate the various GPS chipsets ?

• GT-U7
• Foxeer-M10Q
• GEP-M10

Or more generic like:

• UBlox-6
• UBlox-10

A chipset list will probably become too long.

[mrosseel]

yeah it's not clear what the best approach is here, mainly concerned about users changing defaults and getting into trouble. If @brickbots is fine with your original proposal we can start there.

Further thoughts:

• There's mainly the V1 gps (gpsd 9600) and the V2/V2 gps (ublox 9600), the rest are custom gps'es. Would make it easy for users and still possible for custom gps'es to be activated

[brickbots]

Sorry @d33psky I'm late to the party here. I've been thinking about adding an 'Advanced' section under settings that would have GPS and Camera options... ideally with a message on access stating that any purchased PiFinder already has everything set correctly and you can only get into trouble :-)

Would you be willing to add the 'Advanced...' option and put the camera and GPS settings underneath? If it's hidden away a bit I think it's okay having the chip and baud menus!

[d33psky]

Sorry @d33psky I'm late to the party here.

Was indeed beginning to wonder when you'd join ;-)

I've been thinking about adding an 'Advanced' section under settings that would have GPS and Camera options... ideally with a message on access stating that any purchased PiFinder already has everything set correctly and you can only get into trouble :-)

That sounds like a fair grouping. I like it.

Would you be willing to add the 'Advanced...' option and put the camera and GPS settings underneath? If it's hidden away a bit I think it's okay having the chip and baud menus!

Sure. I'll update this PR.

[d33psky]