BLE Adv Interval

RE: BLE Adv Interval

Petter Myhre — Fri, 22 Sep 2017 10:12:33 GMT

As long as you don't have whitelisting it will accept any connection request.

RE: BLE Adv Interval

endnode — Fri, 22 Sep 2017 08:48:41 GMT

But then SD will accept CONNECT_REQ? And what if the FW doesn't want to handle any? Yes, it can terminate it straight away and also open another broadcasting in parallel so it will have "minimal" visible impact but there still we be some and also power consumption can be higher (if anyone cares). So having high frequency non-connectable broadcasts isn't such a bad idea...

RE: BLE Adv Interval

Petter Myhre — Fri, 22 Sep 2017 08:35:18 GMT

The 100 ms limitation is only for non-connectable advertising. You can use connectable advertising with less than 100 ms. Doesn't make your communication "wrong".

RE: BLE Adv Interval

mich_x — Thu, 21 Sep 2017 02:39:36 GMT

What if I use connectable mode, while the scan machine does not try to connect. Does it make the communication somehow wrong? Can I set the adv interval smaller than 100ms.

BTW, the spec is long. My deadline doesn't allow me to read them through. :(

RE: BLE Adv Interval

RK — Thu, 21 Sep 2017 02:25:37 GMT

I didn't know that - I guess I have to read the whole bloody spec again.

RE: BLE Adv Interval

endnode — Thu, 21 Sep 2017 02:24:08 GMT

Btw. BT 5.0 lifted this limitation for non-connectable adv. interval and Nordic team plans to update S140/132 stacks in the future...

RE: BLE Adv Interval

RK — Thu, 21 Sep 2017 02:21:40 GMT

The reason is the BLE spec says that non-connectable advertising shall not have an advertising interval less than 100ms and the softdevice is certified to follow the spec.

Correct, ADV_NONCONN_IND cannot be scanned. Again those terms are buried in the incredibly long BLE spec.

ADV_DIRECT_IND    - connectable, not scannable, directed
ADV_IND           - connectable, scannable, undirected
ADV_NONCONN_IND   - not connectable, not scannable, undirected
ADV_SCAN_IND      - not connectable, scannable, undirected