Scan response not reported when scan-filter is enabled

[Remo]

Hi

We are using the NCS V2.6.99 for a sample project which scans for peripheral devices.

In this sample project, the scan filter (bt_scan_filter_add(BT_SCAN_FILTER_TYPE_UUID, &uuid);) is used so that only peripheral devices with the correct service UUID are reported. This works so far.

But when I enable active scanning, I don't get any scan response events of my peripheral devices which have the correct service UUID in their advertising data.

Is the reason that the UUID-filter is also applied to the scan response data?

Is it even possible to receive the scan response events from my peripheral devices when the scan filter is enabled, but I don't know the content of the scan-response?

Many thanks in advance.

Best regards, Remo

[Simonr]

Hi

What data are you expecting the peripherals to send in the scan response? I don't see why that wouldn't work if the UUID of the scanned peripherals match filter you've set.

Maybe you can try sniffing the advertising process to find out what's happening on-air here, as an active scanner always should send out the scan requests and get responses from advertisers it has scanned. You can use a dedicated Bluetooth sniffer or an nRF52 DK with the nRF Sniffer firmware and Wireshark.

Best regards,

Simon

[Remo]

Hi

The peripherals are for example advertising the following data:

- Device 1:  ADV_DATA: "My service UUID", SCAN_RSP: "Complete device Name 1"
- Device 2:  ADV_DATA: "My service UUID", SCAN_RSP: "Shortened device Name 2"
- Device 3:  ADV_DATA: "My service UUID", SCAN_RSP: "Manufacturer data"

Since every device has the service UUID in its advertising-data, I can filter for this UUID and get the advertising-data-report successfully. But since the scan-response can contain different tags, I cannot add a dedicated filter for the scan-response. Therefore, how can I get the scan responses of these devices?

Best regards

Remo