Hi Luiz,
When a2dp-sink was added to the reconnection policy, it exposed a bug in
Airpods which were incorrectly emitting Connection Timeout when
connecting to a new device. As a result, Chromebooks started
reconnecting immediately (link loss) and inadvertently "stole"
connections. See hci trace below:
> HCI Event: Disconnect Complete (0x05) plen 4 #1680 [hci0] 62.656436
Status: Success (0x00)
Handle: 256
Reason: Connection Timeout (0x08)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0004} [hci0] 62.656510
BR/EDR Address: E4:90:FD:7D:E7:5F (OUI E4-90-FD)
Reason: Connection timeout (0x01)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0002} [hci0] 62.656510
BR/EDR Address: E4:90:FD:7D:E7:5F (OUI E4-90-FD)
Reason: Connection timeout (0x01)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0001} [hci0] 62.656510
BR/EDR Address: E4:90:FD:7D:E7:5F (OUI E4-90-FD)
Reason: Connection timeout (0x01)
@ MGMT Event: Device Disconnected (0x000c) plen 8 {0x0003} [hci0] 62.656510
BR/EDR Address: E4:90:FD:7D:E7:5F (OUI E4-90-FD)
Reason: Connection timeout (0x01)
< HCI Command: Write Scan Enable (0x03|0x001a) plen 1 #1681 [hci0] 62.668156
Scan enable: Page Scan (0x02)
> HCI Event: Command Complete (0x0e) plen 4 #1682 [hci0] 62.670442
Write Scan Enable (0x03|0x001a) ncmd 2
Status: Success (0x00)
< HCI Command: Create Connection (0x01|0x0005) plen 13 #1683 [hci0] 64.090171
Address: E4:90:FD:7D:E7:5F (OUI E4-90-FD)
Packet type: 0xcc18
DM1 may be used
DH1 may be used
DM3 may be used
DH3 may be used
DM5 may be used
DH5 may be used
Page scan repetition mode: R2 (0x02)
Page scan mode: Mandatory (0x00)
Clock offset: 0x0000
Role switch: Allow slave (0x01)
> HCI Event: Command Status (0x0f) plen 4 #1684 [hci0] 64.090446
Create Connection (0x01|0x0005) ncmd 1
This patch separates the ReconnectUUIDs by adding a ReconnectResumeUUIDs
and distinguishes reconnections that occur on timeout vs. resume.
I've run the following tests:
- Check that Airpods changing to a different device doesn't cause
a reconnection with this change.
- Check that adding a2dp-sink to ReconnectUUIDs will cause the original
issue to be seen.
- Make sure Airpods are reconnected on resume.
- Make sure other headphones are reconnected on resume (tested Anker
Soundcore Life Q20 and ATH-M50xBT)
- Run bluetooth_AdapterSRHealth.sr_reconnect_a2dp (ChromeOS end-to-end
test)
Thanks
Abhishek
Abhishek Pandit-Subedi (1):
policy: Refactor reconnect policy for resume
plugins/policy.c | 72 ++++++++++++++++++++++++++++++++++++------------
src/main.conf | 9 +++++-
2 files changed, 62 insertions(+), 19 deletions(-)
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2.29.2.576.ga3fc446d84-goog
