BLE coded phy scan get twice the same ADV

RE: BLE coded phy scan get twice the same ADV

Prayam — Fri, 19 Feb 2021 16:35:25 GMT

hi! any progress with this?

RE: BLE coded phy scan get twice the same ADV

Prayam — Mon, 15 Feb 2021 15:56:38 GMT

I´d adjust 800ms ADV for 1sec scanner, i get twice the same ADV, 80ms ADV to 100ms of scanner and 50ms adv for 70ms scanner all of that both window and interval. I have always the same result get ADVs on scanner twice. this is the correct result or not?

RE: BLE coded phy scan get twice the same ADV

Kenneth — Mon, 15 Feb 2021 14:45:47 GMT

This is a trade-off between current consumption, time to discover, other BLE links that you may have active at the same time, and potentially also interference that may be present in the area. If you know the maximum advertisement interval is 800ms, and you don't have any current consumption limitations, and there are no other active BLE links, then I would use 1sec for both window and interval.

Kenneth

RE: BLE coded phy scan get twice the same ADV

Prayam — Mon, 15 Feb 2021 13:31:16 GMT

Ok, can you do a scheme of what is the correct scan window for 50ms and for 800ms, and what i get after modified that? In my code i have the same time for scan window and scan interval, i misunderstood that if both are equal ,the scanner is ever scanning, therefore the time inst important

thanks!

RE: BLE coded phy scan get twice the same ADV

Kenneth — Mon, 15 Feb 2021 12:42:20 GMT

Thanks for the clarification, I was thinking you were using our nRF sniffer tool. In your case you are not using our nRF sniffer tool, so disregard my previous comment.

During normal scanning the amount of received advertisement packets will depend on the scan window and interval, every scan interval the radio will switch to a new channel and scan for the period set by the window.

So in your case you likely need to modify the scan window and interval.

RE: BLE coded phy scan get twice the same ADV

Prayam — Mon, 15 Feb 2021 11:58:35 GMT

I'm using as sniffer/scaner another nrf52840 DK with long range test from your example:

devzone.nordicsemi.com/.../testing-long-range-coded-phy-with-nordic-solution-it-simply-works-922075585

RE: BLE coded phy scan get twice the same ADV

Kenneth — Mon, 15 Feb 2021 11:47:21 GMT

I will see if someone can comment on your observation from the developers. I presume you are using the latest nRF sniffer (as of today that is v3.1): https://www.nordicsemi.com/Software-and-tools/Development-Tools/nRF-Sniffer-for-Bluetooth-LE