LE Audio and custom service

RE: LE Audio and custom service

Amanda Hsieh — Thu, 11 Jan 2024 20:17:45 GMT

Hi,

Please try to increase the buffer size for the log by modifying CONFIG_LOG_BUFFER_SIZE.

The data rate here is also related to the ACL connection interval and the DLE length. Also, the NUS is sending using ACL, so the link layer will need to make sure the packet arrives, otherwise the packet will be retransmitted. Therefore, the data rate would not be a fixed value, it also relates to the environment.

-Amanda H.

RE: LE Audio and custom service

RakeLund — Thu, 11 Jan 2024 13:53:49 GMT

I have been testing this example with one gateway and one headset device running on 2 nrf5340 audio dk. If I try to increase the rate of messages I get a warning that messages are dropped.
Does this just mean the logging module dropped the messages because it couldn't keep up, or are they actually not being received?
Do you have any experience with what kind of data rate is possible to achieve on the nus service when running LE Audio?

RE: LE Audio and custom service

Amanda Hsieh — Tue, 12 Dec 2023 15:05:48 GMT

Hi,

[quote user="RakeLund"]Am I correct when I think I have to modify the audio controller that is running on the network core if I want to add my own custom service?[/quote]

No, the services within the application are running on the app code.

-Amanda H.

RE: LE Audio and custom service

RakeLund — Tue, 12 Dec 2023 11:13:42 GMT

I have done some digging and it seems that the activation of nus in this example is done by changing a config variable in prj.conf and that the code managing bluetooth is part of the network core firmware. Am I correct when I think I have to modify the audio controller that is running on the network core if I want to add my own custom service?

RE: LE Audio and custom service

Amanda Hsieh — Mon, 11 Dec 2023 16:02:26 GMT

Hi,

Yes, but please be aware that the maximum ACL link number is 2 for a central to connect peripherals while working with BIS.

This is the test case https://github.com/nrfconnect/sdk-nrf/tree/main/tests/bluetooth/iso and modules https://github.com/nrfconnect/sdk-nrf/tree/main/tests/bluetooth/iso/modules

-Amanda H.

RE: LE Audio and custom service

RakeLund — Mon, 11 Dec 2023 12:39:06 GMT

Thank you, I will look into the example.

Initially we will use CIS, but BIS might be relevant for a future application where we want to stream audio to several devices. Is it possible to send data from peripheral to gateway and stream audio from gateway to peripheral with BIS?

RE: LE Audio and custom service

Amanda Hsieh — Fri, 08 Dec 2023 20:53:37 GMT

Hi,

Are you going to use CIS?

Here is an unofficial example which is based on NCS v2.3.0. Although it is not for the NCS latest version, it's a good reference for a start. It uses NUS to send dummy data between the gateway and earbuds.

“Beware that this code/configuration is not fully tested or qualified and should be considered provided “as-is”. Please test it with your application and let me know if you find any issues.”

Regards,
Amanda H.