Regarding the behavior of bt_audio_stream_start

[tommy]

The following phenomena have been observed in an anechoic chamber:

• Success: After the bt_audio_stream_start function is called, the stream_started_cb callback is invoked.
• Failure: After the bt_audio_stream_start function is called, the stream_stopped_cb callback is invoked, and the wireless connection is disconnected (this also occurs even in the chamber).

Question 1: In the link processing of the SDK2.3.0_nrf5340audio project, during the sequence of audio_stream processing*1, the stream_stopped_cb callback is called, and the behavior of disconnecting and reconnecting the wireless connection is repeated. Do you know the cause? *1: Refers to the bt_audio_stream_config function, bt_audio_stream_qos function, bt_audio_stream_enable function, and bt_audio_stream_start function.

Question 2: When the wireless connection is disconnected, bt_audio_stream_start returns to the beginning and starts the scanning process again. This takes a considerable amount of time, so if there is any workaround, please let me know.

[dejans]

Hi,

Can you provide more information about your testing environment and test setup?

Failure: After the bt_audio_stream_start function is called, the stream_stopped_cb callback is invoked, and the wireless connection is disconnected (this also occurs even in the chamber).

Can you elaborate on this Failure case and the difference compared to Success? What exactly do you consider failure and what do you expect to happen?

Best regards,
Dejan

[tommy]

Thank you for your reply.

Could you refer to the attached material?

[dejans]

Hi,

Thank you for additional clarification.

Does the issue occur sporadically or periodically? Can you provide more information on when Failure case happens?

Can you try using the latest NCS version? Do you see the same problem when you use upgraded NCS version?

Best regards,
Dejan

[tommy]

Dejan,

Thank you for yor reply.

>Does the issue occur sporadically or periodically? Can you provide more information on when Failure case happens?

It happens sporadically.

1~2 out of 10 times under the chamber.

>Can you try using the latest NCS version? Do you see the same problem when you use upgraded NCS version?

it's improved when we use SDK2.7.0, but we would like to use SDK2.3.0 in particular .

[dejans]

Hi,

Thank you for additional information.

Do you have an application log which you could send?

Best regards,
Dejan

[tommy]

Dejans,

Would it be possible to let us know how to output Logs of bt_audio_stream_config, bt_audio_stream_qos,bt_audio_stream_enable,bt_audio_stream_start?

Could you let us know the name and point of source code to be modified?

BR,