RE: Channel sounding - 2 antennas configuration

Amanda Hsieh — Fri, 18 Jul 2025 18:58:21 GMT

Hi,

There's no need to change CONFIG_BT_CHANNEL_SOUNDING_REASSEMBLY_BUFFER_SIZE for this.

Based on the error code they got it looks like the controller returned BT_HCI_ERR_INSUFFICIENT_RESOURCES (0xD). This happens because the parameters aren't supported:

7.8.140 LE CS Set Procedure Parameters command

If the Host issues this command with parameters that exceed the CS capabilities or
any coexistence constraints, then the Controller shall return the error code Connection
Rejected Due to Limited Resources (0x0D).

I suspect the problem is CONFIG_BT_CTLR_SDC_CS_MAX_ANTENNA_PATHS=2 was set only on the initiator side and not the reflector

Regards,
Amanda H.