nRF5340 Audio stream drop without notification

[Omri]

Hi,

I am using the nRF5340 Audio application under NCS v2.8.0 as a Unicast Client (Central).

The nRF5340 is connected to hearing aids.

When moving out of range, audio streaming stops, even though the ACL connection remains active.

We observed that the nRF5340 continues sending audio streaming packets despite receiving NACK responses for each packet.

The nRF5340 does not notify the application about the NACK packets or any issues with the CIS channel.

Is there a way to monitor NACK packets or any other method to detect that the hearing aids are no longer in a streaming state?

Why does the nRF5340 not disconnect the CIS channel in such a scenario?

Regards,

Omri.

[Amanda Hsieh]

(updated)

Hi, 

The team said the behavior is expected. Sincethe unicast client should continue sending ISO packets even if there's no ACK from the unicast server like central continues sending ACL packets until timeout.  If there is NACK then the link is good, SDU is just being flushed all the time. ACL too is good, no disconnection complete will occur. 

Regards,
Amanda H.

[Omri]

Thanks Amanda,

Currently the nrf5340 audio application gets disconnected notification only on ACL. 

Is there a way for the application to be notified about the CIS channel that was disconnected?

[Amanda Hsieh]

The NACK packets will be sent to maintain the connection if the peripheral doesn't have to respond. 

Why would you want the application to be notified about the NACK packets? 

What is your goal to achieve?

[Omri]

Hi Amanda,

You can close the ticket.

Thanks.