GPS stopped working

[robang74]

@Maus

Of course, I could be totally wrong. But I have the feeling you are barking up the wrong tree. A proper, resolvable SUPL hostname has to be configured at a place where the modem’s firmware is able to read and make use of it. And that is what I’d guess the SUPL patchers do, amongst other things.

There are some reason to think that suplpatcher is obsolete by now, at least for Xperia 10 II and III. Let me explain why:

• first of all suplpatcher is a closed-source binary (AFAIK), therefore as long as it is a closed source binary it may arise the doubt of compromising the OS/modem/GPS and their security or privacy constrains plus the doubt that it can infringe some kind of Qualcomm exclusive right (thirdy-party reasonable doubts, not mine doubts nor my claims - expecially for a company like Jolla near the banckrupt and with some Russian ties/debt not 100% addressed, yet).

• secondly, in its easy way of doing goes against the privacy because it removes the TLS layer letting the SUPL request/answer transits uncrypted, in clear.

• it has been reported that suplpatcher CA certs uploading does not persist after a smartphone reboot or a modem hard reset (not tested by myself, just read about)

You might ask what is remain in pushing suplpatcher out of the scene. The answer is to let the Qualcomm modem/GPS to retrieve by its own the CA certs from a folder.

• Project: x10ii-iii-agps-config-emea

Like the PM2 patch above does. It does with Google SUPL services because it was straighforward to test with their service (cfr. patch description). Once, the approach is verified to be working then more SUPL providers can be added as far as they publish their CA certs in a format that Qualcomm modem/GPS can deal with.

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UPDATE: about the GPS patch alternative to suplpatcher

@robang74

I released the v0.0.7 and it could be the “good one” because I have tested intensively and in the worst conditions. Moreover, it is indipendent from Google services but relies on Qualcomm SUPL hosts network. Among other features, implement a throttling for XTRA in such a way the SFOS does not lag and apps do not freeze.

PERFORMANCES

After a reboot, the fix indoor with 4G IPv4 -only mobile data transit on a free UDP VPN with energy save mode enabled and WiFi tethering active, it takes less than 15s for 9000m h-accuracy and near 1m for fixing the point under 100m of h-accuracy, 2m for 15m with 6/41 use/view satellites. Without the WiFi tethering active or any Wifi connections, it takes near 30s for 30m h-accuracy.

The new v0.0.7 patch is available on Patch Manager Web Catalog.

• Project: x10ii-iii-agps-config-emea

Probably, it works also on XA2 but I did not check that its original gps.conf is the same.

Cheers, R-