From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

RE: From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

Ulrich Myhre — Tue, 03 Oct 2017 13:10:14 GMT

No, i think Darrew is correct here. "Discoverability" is a concept that is easy to misunderstand. When you advertise, every scanner can see that advertisement, period. That's regardless of the contents of the advertisement. But in the PDU, you can set some flags to give a hint to the scanner. What you make out of these hints is up to you, but the other advertisement parameters are largely unaffected by these flags. Some scanners might be on the lookout for general discoverable devices, prioritizing to display those over limited/non-discoverable ones.

RE: From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

Darrew — Fri, 29 Sep 2017 09:45:58 GMT

Ok, let's say my device should be discoverable for a limited period of time and connectable all the time. How would you set up the advertising library to do that?

RE: From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

endnode — Thu, 28 Sep 2017 20:43:39 GMT

I'm afraid your understanding of BT SIG specification contradicts with understanding of other people here on the forum...

RE: From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

Darrew — Thu, 28 Sep 2017 13:44:36 GMT

The standard Core4.2 says: "... A device configured in non-discoverable mode will not be discovered by any device that is performing either the general discovery procedure or the limited discovery procedure."

moreover,

"...A device in the undirected connectable mode shall accept a connection request from a device performing the auto connection establishment procedure or the general connection establishment procedure."

Both modes are not incompatible.

A device can be in both non-discoverable mode and connectable mode (eg. undirected). In other words, it may allow connections from a peer device performing any connection establishment procedure but it will not be discoverable to those performing any discovery procedure.

RE: From Discoverable to Non-discoverable (but still connectable!) using the Advertising Library

endnode — Thu, 28 Sep 2017 13:13:01 GMT

Non-discoverable means not connectable.