RE: Scan using bt_le_scan_start

kfci-eng — Tue, 16 Jan 2024 22:00:58 GMT

Hi Jørgen,

Thank you so much for your answer, it helped me. What I will do is scan for the duration of two maximum intervals and stop scanning after that. I have tested this and it scans all the devices I intend to scan within that period of time. Thanks!

Best,

Kevin

RE: Scan using bt_le_scan_start

Jørgen Holmefjord — Fri, 12 Jan 2024 15:18:56 GMT

Hi,

It is not possible to "scanning all the peripherals that are around", since the scanner have no knowledge of what peripherals are available and their advertising parameters. Bluetooth advertisers have different advertising interval and normally transmit packets on 3 different channels. The scanner typically scan on one channel only and switch between the 3 advertising channels each scan interval (see this blog post). You could scan for the duration of the maximum advertising interval (10.24s) and then stop scanning, but you are not guaranteed to receive the advertising packets from all devices at first try (might have on-air collisions with other packets, interference, etc.). To have highest chance of receiving all advertisements, you need to set the scan window equal to the scan interval (to avoid long periods where scanning is disabled). During the scan duration, you will also receive multiple advertising packets from fast advertisers, not just one.

Best regards,
Jørgen