RE: nRF54L15 DK ChannelSounding HCI Command

Lee1823 — Tue, 20 Jan 2026 13:34:23 GMT

I would like to express my sincere gratitude for your helpful responses and guidance. By following your recommended steps in order, I have successfully resolved the issue and can now send Channel Sounding-related HCI commands normally without encountering errors.

RE: nRF54L15 DK ChannelSounding HCI Command

Kenneth — Tue, 20 Jan 2026 09:54:42 GMT

Hello,

First you need to enable channel sounding in the controller by setting CONFIG_BT_CTLR_CHANNEL_SOUNDING=y.

Enabling the controller alone isn’t sufficient – the host side must also advertise that it supports Channel Sounding, or the controller will refuse certain CS commands. So you also need to configure CONFIG_BT_CHANNEL_SOUNDING=y on the host to set the channel sounding feature during initialization. Note: If you are using an external host, then you may need to implement the HCI command “LE Set Host Feature” for the Channel Sounding host support bit, this is automatically done for zephyr host when using CONFIG_BT_CHANNEL_SOUNDING=y.

The Bluetooth Core Specification states that the host must enable the Channel Sounding Host Support bit before using related commands. If the host issues a CS capability request while that bit is 0, the controller shall respond with Command Disallowed. This design is similar to other features (e.g. LE Privacy, LE Extended Advertising) where the host must opt-in via an HCI command.

Kenneth