Issue custom GATT streaming in the firmware when building in release mode.

RE: Issue custom GATT streaming in the firmware when building in release mode.

Vidar Berg — Tue, 28 Apr 2026 11:57:22 GMT

Please let me know if it changes anything. Would also be good if you could try to debug this a bit further. For example, would enabling logging in the release configuration make it work again?

RE: Issue custom GATT streaming in the firmware when building in release mode.

Caio Camargo — Mon, 27 Apr 2026 18:34:38 GMT

I'm currently testing this changes. However to answer you question, yes it's confirm either where it's stop or somewhere else, as I said, the firmware keeps running, but the thread that takes the semaphore never take. I started to think of different threads priorities, then put every thread to the same and let the scheduler to its jobs, but no success. Still get stuck with the LED ON.

RE: Issue custom GATT streaming in the firmware when building in release mode.

Vidar Berg — Mon, 27 Apr 2026 13:30:00 GMT

Thank you. I see now that this and the previous version of the lowpower build were built without sysbuild enabled for some reason (should be enabled by default). For consistency, I suggest you force sysbuild on by selecting the checkbox here:

I also see you have selected CONFIG_CLOCK_CONTROL_NRF_K32SRC_20PPM with the lowpower build while using the internal RC oscillator. The problem with that is that the RC oscillator in HW only has a 500 ppm accuracy. This will eventually lead to connection problems as the BT stack will fail to correctly compensate for the clock drift. You can comment this line to let it default to CONFIG_CLOCK_CONTROL_NRF_K32SRC_500PPM.

Does the led_on() indicaten in your timer callback confirm whether the callback stops being invoked or not?

Best regards,

Vidar

RE: Issue custom GATT streaming in the firmware when building in release mode.

Caio Camargo — Mon, 27 Apr 2026 12:26:44 GMT

Hello Vidar, thank you for a fast reply.

To give more info this is how I'm building passing optimization levels for each build:

Here I'll compressed both builds in one file zip.

devzone.nordicsemi.com/.../both_5F00_builds.zip

RE: Issue custom GATT streaming in the firmware when building in release mode.

Vidar Berg — Mon, 27 Apr 2026 08:34:05 GMT

Hello,

I wanted to compare the build configurations from the build_debug and build_lowpower output, but I see that the latter is missing the configuration files. Would you mind rebuilding the lowpower version and upload the folder again?

Best regards,

Vidar