[bluez/bluez] 2c6d6b: adapter: add BCAA UUID also when seen device is no...

[bluez/bluez] 2c6d6b: adapter: add BCAA UUID also when seen device is no...

[Pauli Virtanen]

  Branch: refs/heads/1093117
  Home:   https://github.com/bluez/bluez
  Commit: 2c6d6baaf29b7b7cf6cc44e9d26a0239bfbd3e19
      https://github.com/bluez/bluez/commit/2c6d6baaf29b7b7cf6cc44e9d26a0239bfbd3e19
  Author: Pauli Virtanen <pav@iki.fi>
  Date:   2026-05-11 (Mon, 11 May 2026)

  Changed paths:
    M src/adapter.c

  Log Message:
  -----------
  adapter: add BCAA UUID also when seen device is not discoverable

BAP v1.0.2 Sec 6.4 specifies Broadcast discovery uses observation
procedure (Core Vol 3 Part C Sec 9.1.2) which makes no reference to
device discoverability state.

However, if remote device does:

1. Send Advertising Data for some other UUID with General Discoverable
2. Send Advertising Data for BCAA UUID with no flags

then adapter.c:btd_adapter_device_found() creates device in step 1. but
in step 2. it ignores the BCAA UUID since the device exists but is not
discoverable; the monitoring=true special case applies only for
first-seen devices.  Consequently bap plugin fails to pick up the BCAA
stream.

This sequence was observed to be produced by BlueZ + btvirt.

Fix by monitoring also previously existing but currently non-connectable
devices with BCAA UUID.

Link: https://gitlab.freedesktop.org/pipewire/pipewire/-/merge_requests/2812#note_3467783
Log:
--------------------------
@ MGMT Event: Device Found (0x0012) plen 17
        LE Address: 00:AA:01:00:00:42 (Intel Corporation)
        RSSI: invalid (0x7f)
        Flags: 0x00000000
        Data length: 3
        Data[3]:
        02 01 06                                         ...
        Flags: 0x06
          LE General Discoverable Mode
          BR/EDR Not Supported
...
@ MGMT Event: Device Found (0x0012) plen 39
        LE Address: 00:AA:01:00:00:42 (Intel Corporation)
        RSSI: invalid (0x7f)
        Flags: 0x00000004
          Not Connectable
        Data length: 25
        Data[25]:
        06 16 52 18 56 db 55 03 03 4e 18 0d 16 4e 18 00  ..R.V.U..N...N..
        ff 0f 0f 00 04 03 01 01 00                       .........
        Service Data: Broadcast Audio Announcement (0x1852)
        Broadcast ID: 5626710 (0x55db56)
        16-bit Service UUIDs (complete): 1 entry
          Audio Stream Control (0x184e)
        Service Data: Audio Stream Control (0x184e)
          Data[10]:
        00 ff 0f 0f 00 04 03 01 01 00
--------------------------



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