RE: How to determine channel sounding security level

Edvin — Tue, 05 Aug 2025 12:52:41 GMT

Hello,

You can look at the file ncs\zephyr\samples\bluetooth\channel_sounding\src\connected_cs_initiator.c.

In the main.c, it uses first:

err = bt_conn_set_security(connection, BT_SECURITY_L2);

and then later:

err = bt_le_cs_security_enable(connection);

So these are a bit different from a normal BLE service.

Both of these are waiting for callbacks using their respective semaphores:

security_changed_cb()

and

security_enable_cb().

The first one contains a parameter saying what security level it has.

Have you tested this sample?

Best regards,

Edvin