BLE Channel Sounding: LL_CS_CONFIG_REQ rejected with Unsupported Feature Or Parameter Value

Question

Created 6d

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I'm testing Bluetooth Channel Sounding interoperability between an Apple device and a BLE peripheral.

During Channel Sounding configuration, the peripheral sends an LL_CS_CONFIG_REQ, but the request is rejected by the central device with:

LL_REJECT_EXT_IND Rejected Opcode: LL_CS_CONFIG_REQ Error Code: Unsupported Feature Or Parameter Value

I would like to understand which parameter in the Channel Sounding configuration may be incompatible with the Apple device.

Could the expert clarify which Channel Sounding configuration parameter would cause the Apple device to reject this LL_CS_CONFIG_REQ?

Sniffer log.png

if sniffer log is needed, I can send it via e-mail.

Answer 1

DTS Engineer OP

Apple

5d

During Channel Sounding configuration, the peripheral sends an LL_CS_CONFIG_REQ, but the request is rejected by the central device with:

LL_REJECT_EXT_IND Rejected Opcode: LL_CS_CONFIG_REQ Error Code: Unsupported Feature or Parameter Value

Please file a bug on this and then post the bug number back here. Also, where were you physically located when testing this? Regulatory issues prevent us from enabling channel sounding in some countries, and I wouldn't be surprised if it resulted in this error at the hardware level.

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Kevin Elliott
DTS Engineer, CoreOS/Hardware