Problems in understanding GTBS - TBS relation in subsys/bluetooth/audio/tbs.c

[lukas-fwdev]

Hi community,

I am currently trying to understand how the Generic TBS and TBS instances are handled in the implementation, especially how the init is done in 'subsys/bluetooth/audio/tbs.c' bt_tbs_init() function. There I can see that bt_gatt_service_register() is only done on the tbs instances but not for gtbs, right? I would like to know if this is by intention or a bug?
I can see that there had been a lot of changes done by @MariuszSkamra and @fabiobaltieri some months ago, maybe you can help?

Any help understanding this deeper is very much appreciated.

Thanks in advance!
lukas

[fabiobaltieri]

cc @Thalley

[Thalley]

GTBS is statically registered via

BT_GATT_SERVICE_DEFINE(gtbs_svc, BT_TBS_SERVICE_DEFINE(BT_UUID_GTBS, &gtbs_inst.inst));

when CONFIG_BT_GTBS=y.

The other TBS uses bt_gatt_service_register because at the time of the implementation, we did not have a way of statically registering multiple services (we do now, but haven't been implemented).

It's a moot point though, because we want to move towards dynamically registering them: #41738

[lukas-fwdev]

Thanks for the fast response! This was the information I was looking for.

The proposed enhancement would indeed make things a lot easier and dealing with more TBS instances much more flexible.