BLE advertising rate interval - how to auto change from min to max?

RE: BLE advertising rate interval - how to auto change from min to max?

GerardB — Mon, 08 Aug 2022 14:37:18 GMT

OK - thanks Einar.

Let me see if I can change my adverting interval after 30 seconds.
Will try:

bt_le_adv_start(<using fast interval>);

....

.... 30 seconds later

bt_le_adv_stop(..);

bt_le_adv_start(<using new slow interval>);

I assume that will do it..!

Thanks again for your fast response.

Gerard

RE: BLE advertising rate interval - how to auto change from min to max?

Einar Thorsrud — Mon, 08 Aug 2022 06:40:16 GMT

Hi Gerard,

There is no need to start using the Common Application Framework (CAF) for this, I was more thinking about if you were already using it. The implementation of this feature in the CAF advertising module just does what I described in my previous post: use a delay (in form of a delayable work item in this case) and restart advertising with the new longer interval after a set amount of time. That is the simplest way to do this.

Einar

RE: BLE advertising rate interval - how to auto change from min to max?

GerardB — Sun, 07 Aug 2022 09:16:18 GMT

Hi Einar,

Thanks for your fast response. Can you tell me a little more about when/why one would use the "Common Application Framework"? What are the pros and cons of using that framework? Is it something new & recommended?

I did read: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.0.2/nrf/libraries/caf/index.html#lib-caf

But it would require us to totally re-architect our application, so any more insight would be appreciated.

Thanks

Gerard

RE: BLE advertising rate interval - how to auto change from min to max?

Einar Thorsrud — Fri, 05 Aug 2022 12:37:14 GMT

Hi,

The Zephyr Bluetooth API does not have a way of automatically adjusting the advertising interval. You could use a timer (or a delayed work item in a work queue) to schedule an update of the interval at a later point, and then stop and re-start advertising with a new interval.

Alternatively, if you are using the Common Application Framework with the Bluetooth LE advertising module, this has support for starting with a short interval, and then switching to a longer interval after a defined timeout. See Changing advertising interval.