GPS/location services don't work with Maps after Bookworm upgrade

[wibble]

The wiki entries certainly need updating - I'll do it if nobody else has by the time I've got something I'm confident in. The AGPS data can now be uploaded using mmcli which does it using QMI rather than AT commands. I'm not clear on whether it sets the time though, which I think was important for being able to use the AGPS data. There still seems to be a gap around where responsibility for triggering the AGPS upload and (if necessary) time setting lies, and ModemManager doesn't have an API for checking its validity (don't want to repeat download/upload if data is still valid). If you hit polkit restrictions using mmcli then sudo will work around it until we've got something 'proper' that can get its own permissions config.

can you write exactly how to do it?

Not with any confidence, especially as gitlab.freedesktop.org is currently down due to hardware failure so I can only see the modemmanager issues that I've got in open tabs still. Remembering the polkit issue above, some of these may need sudo to even run.
You can get a list of possible URLs for location data using:

Code:

mmcli -m any --location-status

You can download the file, then upload it using something like:

Code:

mmcli -m any --location-inject-assistance-data=/path/to/downloaded/xtrapath3-xtra3gr.bin

However in ModemManager issue #417 it's noted that the data from the URLs differs, and sometimes one or other won't work properly. Meanwhile issue #439 about the lack of an API to check whether the current data is valid uses the AT command to demonstrate how to do the check:

Code:

$ mmcli -m any --command='AT+QGPSXTRADATA?'
response: '+QGPSXTRADATA: 10080,"2021/09/19,15:00:00"'

When I tried a couple of weeks or so back this worked, but when I had time to look closer after an update the --command option no longer worked as it's only usable in debug mode. I think we've been round that being enabled/disabled in updates before too. That option was the route I was going to go for using the AT+QGPSXTRATIME to set time before uploading the data too, since it's not clear (to me) whether that's done as part of the --location-inject-assistance-data command or not, and I haven't spotted an API for it.