Request for testing and feedback with Bluetooth on Android 14 QPR2 GrapheneOS

Since the 2 workarounds we added don't appear to have accomplished anything, they'll be removed in the next release. We'll try to figure out something else to fix the issues for the next release. The main issue is that we don't have one of the few devices with an issue to debug it ourselves. We need to purchase one of these Bluetooth accessories for one of our developers.

Galaxy Watch 5 and 6 seem like the main devices with an issue and the OBDLink MX+ / OBDLink LX are a secondary one. We expect the old medical device mentioned above is broken for a separate reason and may not work on Android 14 QPR2 with stock OS either, so we can't do much about that beyond waiting for them to work around it if they do that. We'd like to get the Galaxy Watch 5 / 6 and OBDLink issue resolved ASAP but again it's very hard to debug it without access to one.

We've purchased a Galaxy Watch 6 Classic with eSIM support for a bit under 250 USD for one of the developers. It should arrive in a few days.

We've determined that the stock Pixel OS is using a different Bluetooth module version from what's available in AOSP. This is almost certainly what leads to the issues not occurring on the stock OS. They appear to have done something like taking a snapshot of the main branch, applying security patches and testing it via the CTS, etc. without doing real world testing. The stock OS is using different code which was properly tested and fixed up before release. They either pushed the wrong Bluetooth module tag to AOSP due to a mistake or they are building it from an APEX (mainline) module despite it not being updated as a Google Play mainline module yet. It's likely the latter, and they forgot to push APEX tags for it because it's not an official mainline module yet. We've contacted them and hopefully they'll resolve this by pushing tags soon. As soon as proper tags are available, we can get to work building the code they shipped rather than the broken code in AOSP.

This is an unfortunate situation beyond our control. Anyone building AOSP QPR2 will face the same issues. There isn't a Google Play mainline module for Bluetooth yet which would result in there being tags since mainline modules are fully open source.

We can only hope they push tags quickly. It's unrealistic for us to figure out how to fix the issues ourselves.

AOSP Bluetooth code in QPR2 likely DOES pass the CTS, but they didn't do enough real world testing and are unaware that it's broken with specific devices. Stock Pixel OS code appears somewhat older, not newer, and we likely got new bugs from the main branch they forked for QPR2 AOSP which they avoided for stock Pixel OS by building something older. The issues we got from AOSP QPR2 may be fixed in main already but it may have new issues and we also can't simply use that code since it won't build due to dependencies on changes elsewhere.

We're doing our best and this is in fact not caused by any GrapheneOS changes or features.

We've received the Galaxy Watch 6 Classic and can replicate the issue. No progress on resolving it yet.