Can Advertising range reach as far as disconnected range?

RE: Can Advertising range reach as far as disconnected range?

Simonr — Tue, 21 Dec 2021 06:22:43 GMT

Hi Jason

With my second to last sentence I meant that if the device disconnects at ~500 meters you should be able to scan and connect to an advertising device near 500m (not more) as well. Sorry about any confusion. How exactly do you test up to 500m?

How fast do you increase the distance between the two test devices? If you move them too quickly, the disconnect reason might be a connection supervision timeout a while after the last transmitted message. Do you confirm that there is communication between the two devices at a distance close to the disconnect reason? You can try decreasing the connection supervision timeout.

Best regards,

Simon

RE: Can Advertising range reach as far as disconnected range?

JasonGeo — Mon, 20 Dec 2021 12:07:22 GMT

Hi Simon,

Thanks once again for supporting the ticket.

As mentioned, the test was done with the same Long Range example from Nordic which you provided the link for. So the DK boards would be advertising and scanning on Coded PHY assuming I followed the instructions correctly.

I am abit confused with your second last sentence. Are you saying if the boards disconnect at 500m, I should be able to re-scan and connect from a distance of approx 250m to 500m?
Or are you saying I am able to scan and connect from a distance of 500m to 750m?

From my testing, I am definitely not able to re-scan and re-connect at more than 400m after disconnection at 500m. I can scan and connect at distance 350m or less.

RE: Can Advertising range reach as far as disconnected range?

Simonr — Mon, 20 Dec 2021 10:06:39 GMT

As the "Testing non connected states" mention in the blog post, an important step is to set up the scanner to scan all the time to make sure that you have the biggest chance to pick up the advertisements. If not, you might have to wait a while for the scanner to find an advertisement on longer ranges, as more will be missing at longer ranges. You should indeed be able to scan and connect to an advertising device on the Coded PHY at longer ranges than ~half the range you stay connected in. Are you sure you advertise and scan on the Coded PHY?

Best regards,

Simon