Changing BLE services at runtime in NCS

[Adarsh]

Hello ,

Is it possible to possible change/disable the BLE services at runtime  in zephyr ?

For eg. we have services A,B and C in normal operation and we want disable A,B and C during runtime.At the same time activate service D.

Is it possible to do that ? Do we need a reboot in this case ? 

In Zephyr Document I can see that there funtions for register and deregister services. https://docs.zephyrproject.org/latest/doxygen/html/group__bt__gatt__server.html#gaf5bf0205fad5f7ad187b764d23deba6b

Regards,

Adarsh

[Hieu]

Hi Adarsh,

Yes, you can use the API you found to dynamically change the BLE GATT table. You will also need to enable CONFIG_BT_GATT_DYNAMIC_DB.

For the peer device to be aware of a change without rediscovering the services, you will also need to support the Service Changed Characteristic (CONFIG_BT_GATT_SERVICE_CHANGED).

Please examine carefully what the normal behavior for the built-in service is when dynamic GATT is enabled. I think most of them will register themselves by default.

Regards,

Hieu

[Adarsh]

Hallo Hieu,

In the Zepyhr API, its mentioned that the register/unregister of services should happen before ble_init(). Does that mean ,we need a reboot for changing the services dynamically ?

Regards

Adarsh

[Hieu]

Hi Adarsh,

Note that it also allows being called after settings_load(), just not between ble_init() and settings_load().

Regards,

Hieu

[Adarsh]

Does that mean we dont need a reboot ?

[Hieu]

That's right. It means you shouldn't need a reboot.