Channel sounding security level

[Shreeyash17]

While checking the Channel Sounding samples, I came across the concept of Channel Sounding Security Levels. I have a few questions regarding how this is handled in Nordic’s implementation:

1. Which Channel Sounding Security Level is currently being used in Nordic’s Channel Sounding samples?

2. Since the Nordic controller does not support 10 ns RTT accuracy, Security Levels 3 and 4 are not applicable.If the user wants to explicitly configure Security Level 1 or Security Level 2, what changes need to be done on the host side (e.g., which commands and parameters must be set)?

[Edvin]

Hello,

Can you please provide some sources where you heard about these different security levels for channel sounding? I believe (but I could be wrong) there is only one level specifically for channel sounding, which is used for RTT. Are you sure the security level 3 and 4 that you speak of are not the security level of the BLE connection itself?

Best regards,

Edvin

[PaKa]

devzone.nordicsemi.com/.../how-to-check-cs-procudure-used-by-controller-in-ble-channel-sounding-security

[Edvin]

Ok, that makes sense. The reason I didn't find any implementation suggesting you could set this security level is because it is set automatically by the SoftDevice Controller, depending on what type of channel sounding you are doing.

Best regards,

Edvin