Cannot enable BLE HCI survey

RE: Cannot enable BLE HCI survey

Hung Bui — Mon, 26 Aug 2024 12:55:38 GMT

Hi Aurélien,

Please don't click Verified Answer if you still have question.
Channel survey can be used to detect which channels the BLE communication should use to avoid busy channel (when you have a lot of traffic on channel overlapping with Wifi for example)

Most often, it's the central that set the channel map table (from Bluetooth 5.3 peripheral can request as well). So that's why this channel survey feature is implemented on the Central and Multirole.
Another reason why it's not on the Peripheral as far as I know is to keep the size of the peripheral stack lower.
What you can try is to enable Central role and test again (even though you don't use Central role). The trade off is larger stack size.

RE: Cannot enable BLE HCI survey

fr_adv — Fri, 23 Aug 2024 14:49:41 GMT

Hello M. Bui,

Thank you for your support, my device is acting as "peripheral only" unfortunately... Do you know if this feature is planned soon for BLE peripherals ?

Moreover, when should this feature be used ? When the central is connected to the peripheral ? I'm wondering what's the purpose of this survey.

Thanks in advance,

BRs
Aurélien

RE: Cannot enable BLE HCI survey

Hung Bui — Fri, 23 Aug 2024 14:40:27 GMT

Hi,

In your setup your device act as a central or a peripheral ?
If you take a look at \nrfxlib\softdevice_controller\readme.rst you will find this:

So if it's a peripheral it won't work.
I did a quick test with the central_uart and it seems to work (no error -5). I haven't started the survey through. Also I would suggest to wait until bluetooth stack is ready before you start.

devzone.nordicsemi.com/.../1732.central_5F00_uart.zip