BLE filter accept list : BT_LE_ADV_OPT_FILTER_SCAN_REQ doesn't work properly

RE: BLE filter accept list : BT_LE_ADV_OPT_FILTER_SCAN_REQ doesn't work properly

jithurm — Mon, 12 Aug 2024 11:54:45 GMT

Thanks for the update ! Now it makes more sense. I haven't had time to test with the CONFIG_BT_LL_SW_SPLIT, but I would guess it behaves similarly if this is a limitation of this feature.

Best regards,

Jimmy

RE: BLE filter accept list : BT_LE_ADV_OPT_FILTER_SCAN_REQ doesn't work properly

Elfving — Mon, 12 Aug 2024 11:13:07 GMT

Hello again,

Our team has looked into this, and it doesn't seem to be a bug.

What is happening is that the two scanners ends up sending a scan_request at the same time. So they crash on air, so that both the scanners ends up listening for scanresponse at the same time. The advertiser responds to the scan_request from the scanner that is in the filter accept list, but the scanner that is not in the filter accept list also receives the scan_rsp.

This is allowed, scan_rsp PDU does not have target address hence a peer that listens on 37/38/39 channels will receive the PDU.

Thanks for the report!

Regards,

Elfving

RE: BLE filter accept list : BT_LE_ADV_OPT_FILTER_SCAN_REQ doesn't work properly

Elfving — Wed, 07 Aug 2024 09:22:18 GMT

Did you get to testing the softdevice controller (ie. CONFIG_BT_LL_SW_SPLIT) like you suggested on the Discord channel?

Regards,

Elfving

RE: BLE filter accept list : BT_LE_ADV_OPT_FILTER_SCAN_REQ doesn't work properly

Elfving — Tue, 06 Aug 2024 13:20:48 GMT

Hello Jimmy,

Thanks for letting us know. That does sound like a bug. I am looking into it.

Regards,

Elfving