LeAudio connection will be disconnected

[chelalv]

I use nrf52833 dk to run examples\run_unicast_server.py. My Samsung phone can connect and pair, but the link will be disconnected when playing music, and then it will connect again. If you don't play music, the link will not be disconnected
DISCONNECTION: Connection(transport=1, peer_address=6D:14:7D:6A:AA:B1), reason=19.
I don't know why the link is disconnected.

run_unicast_server.log

[markusjellitsch]

Hi,

what i can see based on your log is that the Samsung Phone only enables the characteristic (handle 0x0020), but not the < Sink ASE> characteristic.

This is the log part, where notifications are enabled.
15:27:13.407 D bumble.gatt_server: Subscription update for connection=0x0200, handle=0x0020: 0100 15:27:13.407 D bumble.gatt_server: CCCDs: {32: b'\x01\x00'}

Now what happens is, that your phone tries to configure the LE Audio Stream with the CODEC_CONFIGURE commmand (to set the codec configuration, sample rate, target latency, etc.). For this command the phone waits for two notifications ( and < Sink ASE>). What i can see is, that only the first is sent, but not the < Sink ASE> characteristic.
The phone waits approx. 3 seconds and finmally disconnects.

Maybe you can try it with a different phone as I assume this is an issue on the phone side.

[zxzxwu]

You need to check Android logcat and bugreport. Analysis is impossible with only the log from Bumble.

[chelalv]

You are right.

ASE State Transitions:
IDLE (0) → CODEC_CONFIGURED (1) -
CODEC_CONFIGURED (1) → QOS_CONFIGURED (2) -
QOS_CONFIGURED (2) → ENABLING (3) -
ENABLING (3) → STREAMING (4) -
Mobile sends ASE_RELEASE command - Release connection
ERELEASING (6) → IDLE (0) - Return to idle

In the ENABLING state, the server(phone) should:
Create a CIS (Connected Isochronous Stream) connection
Establish an ISO data path
Automatically transition the ASE to the STREAMING state

I switched to nrf5340dk, and it worked fine during testing; the connection wasn't lost.
run_unicast_server-5340dk.txt