Bluetooth Advertising messes up after a few days of no power

[SohamGhugare]

Hello Team,

We have noticed a very weird issue with the nRF5340 Audio DK. After flashing the audio application code given by nordic, everything works perfectly fine. No build errors or flash errors. However if the board is left unattended or unpowered for a few days (2-3 days), the bluetooth advertising messes up completely. On checking the logs, it shows directed advertisement has been timed out, switching to normal advertisement. This is instantly fixed if we just re-flash the firmware. Here's the details of the SDK and toolchain.

Toolchain Version: 3.0.1

SDK Version: 3.0.1

We have tried this on all the nRF5340 Audio DK's we have and all of them face the same issue. How can this be fixed?

[SwRa]

Hi Soham,

After a headset is bonded, it will always use direct-ADV after being disconnected for a short time and then switch to normal ADV. What you saw could be the ordinary behavior. Toggling the power on the ADK confirms this.. However, we will leave it without power overnight and test it once more.

Regards,

Swathy

[SohamGhugare]

Hi Swathy,

Yes, I'm aware about the directed adv switching to normal adv after some time, but this time duration is usually fixed and set by the audio application. However in our case when the board is not powered for a bit, it switches from directed to normal adv within 2 seconds of powering on which I think is unusual.

Regards,

Soham