L2CAP extended flow control packet blocks socket [371713238]

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Bug

[AOSP] assigned

Status Update

No update yet.

Description

de...@gmail.com

created issue #1

Oct 6, 2024 03:14AM

I (among others) have reverse engineered airpods, and I am working on implementing features on linux, and android. But there is a bug in Flouride.

In the file l2c_link.cc, on line 118, it sends some packet to check for Extended Flow Control, but the airpods will not respond with anything until a specific handshake packet is sent. There is also another check performed for this very thing in l2c_fcr.cc from lines 1605 to 1610.

When I try to create a l2c socket from a user app, it blocks the thread and throws an ANR. So for testing purposes, I commented this line and this check performed for extended flow control too. And I rebuilt the libbluetooth_jni.so and replaced it using root. And... It worked, I could create a docket and communicate with the airpods!

This, of course, is a temporary fix. Maybe the send packet function shouldn't block if it is sending this particular packet, and should return if no response is received from the peer. But I believe people maintaining the code are much smarter than me, so I'm sure there'll be a better solution :)

Hoping this issue gets resolved quickly!

Comments

vi...@google.com <vi...@google.com> Oct 6, 2024 07:54AM

Assigned to vi...@google.com.

vi...@google.com <vi...@google.com> #2Oct 6, 2024 10:37AM

Also confirmed issue persists on 4.4.

de...@gmail.com <de...@gmail.com> #3Oct 6, 2024 11:03AM

There are a lot of expensive accessories I've purchased or been gifted that quit workin with android 4.2. Android devs need to get on this. 3 broken versions and numerous minor updates and it hasn't even been triaged yet. Completely unprofessional.

vi...@google.com <vi...@google.com> #4Oct 26, 2024 07:59PM

We are loyal to Android as and they treat us like this.. I have a google device and yet it still is not fixed.

de...@gmail.com <de...@gmail.com> #5Oct 27, 2024 03:12AM

Please fix

vi...@google.com <vi...@google.com> #6Dec 7, 2024 08:22AM

Yes, please fix it. =)

de...@gmail.com <de...@gmail.com> #7Dec 7, 2024 08:39AM

I abandoned iPhone to discover something better, but I'm finding a lot of my Bluetooth paired devices won't work properly on android... I hope this gets fixed soon. I don't want to have to buy an iPhone again and suffer with their long agreements and system restrictions.

de...@gmail.com <de...@gmail.com> #8Dec 7, 2024 08:41AM

[Comment deleted]

de...@gmail.com <de...@gmail.com> #9Dec 7, 2024 08:42AM

fix will ya? make the android better more

de...@gmail.com <de...@gmail.com> #10Dec 10, 2024 04:22AM

Yes, count me as someone who would like to see this fixed. It apparently isn't fixed in KitKat.

ho...@gmail.com <ho...@gmail.com> Jan 23, 2025 12:07AM

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sc...@gmail.com <sc...@gmail.com> #11Jan 25, 2025 11:06PM

I have two nexus devices and this is a regular issue. The kid can't play games properly. Way to replace a working stack with a subpar homebrewed one.

de...@gmail.com <de...@gmail.com> #12Jan 26, 2025 06:01AM

Please roll back previous API. This fratura is importante.

de...@gmail.com <de...@gmail.com> #13Jan 26, 2025 01:39PM

Android 4.3 killed my super mario :(

re...@gmail.com <re...@gmail.com> #14Feb 9, 2025 11:10AM

Please fix, pretty please

ma...@gmail.com <ma...@gmail.com> #15Feb 9, 2025 09:24PM

I have a device that worked fine with Bluez and now is broken with Bluedroid. Please add support for devices requiring L2CAP connectivity. From the logs, it seems to try and run L2CAP over GATT/ATT even with devices that are not BLE.

Thanks

de...@gmail.com <de...@gmail.com> #16Feb 15, 2025 10:14PM

Please fix this!! We want to play with us wii u pro controller!! C'mon Google!!

de...@gmail.com <de...@gmail.com> #17Feb 17, 2025 04:38PM

PLEASE GOOGLE, LET US HAVE BLUETOOTH FREEEEEEEEDDDDOOOOOOOOOOOOOOOOOOM!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

de...@gmail.com <de...@gmail.com> #18Feb 17, 2025 08:42PM

Google, please fix this issue. many games are unplayable with said issue.

za...@gmail.com <za...@gmail.com> #19Feb 22, 2025 05:49AM

Please google, can someone please fix this issue. thanks

de...@gmail.com <de...@gmail.com> #20Feb 22, 2025 04:02PM

Would love to see this resolved. Like a handful of others on here I just wanted to sync a bluetooth controller to my Android device to play some games. (I'm not very good at Megaman X with the touchscreen). I know it isn't a huge system issue, but maybe it could be changed anyway?

Games already look great on the Note 3, would be better with my controller.

Thanks in advance!

ts...@gmail.com <ts...@gmail.com> #21Mar 8, 2025 07:50AM

Just want to play some Bayou Billy for nes on my Note 3 with wiimote controller please.