BLE6.0 channel sounding CS_DRBG

RE: BLE6.0 channel sounding CS_DRBG

Kenneth — Wed, 15 Apr 2026 12:00:08 GMT

Hello

Overriding channels order violates the spec and therefore it is not possible in the regular CS samples.

However, if you only need it for testing you can have a look into CS Test command. There are zephyr samples using these commands:
https://github.com/nrfconnect/sdk-zephyr/tree/main/samples/bluetooth/channel_sounding/cs_test

The CS Test sample shows how to use the CS test command to override randomization of certain channel sounding parameters, experiment with different configurations, or evaluate the RF medium.

Please note we don't have any detailed documentation for the samples, and also it should only be used for testing/evaluation purposes, they are not intended for the production usage.

Hope that helps,
Kenneth

RE: BLE6.0 channel sounding CS_DRBG

mike_al — Wed, 15 Apr 2026 02:49:55 GMT

When conducting Channel Sounding tests, I wish that the channel hopping between the initiator and the reflector would proceed in a sequential frequency order, rather than in the random channel sequence calculated by the channel selection algorithm.

Specifically, I have configured the channel_map to cover the frequency range from 2406 MHz to 2420 MHz, encompassing a total of 15 channels. I expect that during each step of the communication process between the two devices, the channel hopping will follow a sequential order, such as 2406 MHz → 2407 MHz → 2408 MHz → … → 2420 MHz, instead of adhering to the channel_map sequence scrambled by the CSA#3b algorithm.

RE: BLE6.0 channel sounding CS_DRBG

Kenneth — Tue, 14 Apr 2026 13:39:40 GMT

Hello,

DRBG is internal part of the controller and not direct accessible, can you described a bit more what you are trying to do, maybe there are other ways it can be solved.

Kenneth