What are the conditions for sending a scan request?

[sdi_kei]

Hello.

I am developing using nrf52832 (S132 v7.0.1, SDK v16.0.0) as central and Android device (Bluetooth 4.2) as advertise.
Android devices use nRF Connect.

I can set "Advertising data" and "Scan Response data" in nRF Connect and I want to receive both data. Whether or not these are received is determined by the argument "scan_evt_t" structure of "scan_evt_handler". (Example: p_scan_evt-> params.filter_match.p_adv_report-> type.scan_response)

Currently, after receiving "Advertising data", "Scan Response data" can be obtained on rare occasions.
How can I set central so that I can get "Scan Response data" every time after getting "Advertising data"?

Thank you.

[run_ar]

I meant, that to check that this is not caused by something in your implementation, you could try to place the scanner and advertiser in an RF chamber to see if this improves. Not sure it would make much sense for me to test it here with different fw.

[sdi_kei]

Hello.

I want you to check. This is because if you can receive "Scan Response data" every time you receive "Advertising data", you know that my software should be set up like the FW you used.

Best Regards.

[run_ar]

Hi

Sorry for the late reply, unfortunately I did not have time to test it this week. but this case is first on my list now, so assuming I will be able to test it next week.

Br,

[sdi_kei]

Hello.

Thank you for your investigation.
I am looking forward to the results.

Best Regards.

[run_ar]

Hi,

It took some time to modify the SDK examples to log this and perform the testing. Testing is performed at my home office without a RF chamber. Both scanner and advertiser is a nrf52832 DK.

In this log you see 22 hits (search in notepad++) for:
<info> app: scan match 7E32890DE6DC

<info> app: scan match 7E32890DE6DC

And there is 2100 hits for:

<info> app: scan match 7E32890DE6DC

<info> app: scan req: 01

Meaning the amount of failing active scans using a nRF52832 as active scanner is close to 1%.

Active scanning RTT log.txt