Set CONFIG_BT_DEVICE_NAME from CMakeLists?

[i_4556]

Hello,

We are developing for the NRF5340 and Zephyr (SDK 2.5.0). As we approach the first preproduction run, we are realizing we need a better way to set device names than just editing CONFIG_BT_DEVICE_NAME  in the prj.conf file (and then waiting a few minutes for the entire project to build)

We had the thought that maybe we could edit it in the CMakeLists file, seeing as we are able to set other settings there.

Presently we have tried this:

set(CONFIG_BT_DEVICE_NAME "foo")

But it doesnt seem to work.

To ensure I wasnt having a caching issue with whatever was scanning the BLE, I added this code to our device to test with:

NUS_Send("main alive, time %u name %s \n",Get_Timer_Count(),CONFIG_BT_DEVICE_NAME);

And my output is always:

main alive, time 268335 name Zephyr

The time increments, but I always see the default name.

What am I doing wrong? Is this a viable approach?

Thanks for your time!

[Hieu]

Hi i_4556,

Regarding why the set function doesn't work, perhaps it's because the quote character (") hasn't been escaped?
Refer to an example where a Kconfig value is set in CMakeList here: samples_for_nrf_connect_sdk/bootloader_samples/keys_and_signatures/mcuboot_smp_custom_key/CMakeLists.txt at v2.3.0 · hellesvik-nordic/samples_for_nrf_connect_sdk (github.com)

Aside from this, the CMake configuration also need a full rebuild to take effect. Note that this would contradict with your eventual goal of reducing build time.

You are much better off using bt_set_name() instead. Once you finalize your production application, you can switch back to using Kconfig normally for the final build.

Hieu

[i_4556]

Thank you for your answer, I instead looked into bt_set_name like you suggested and got it working.

Have a great day!

[Hieu]

Happy to help. Have a great day too!