Is there any actual difference between "Fast Advertising", and "Slow Advertising" - or is it just a way to easily specify two different sets of timing parameters?
The question has been asked before; eg,
https://devzone.nordicsemi.com/f/nordic-q-a/16843/slow-fast-advertising
https://devzone.nordicsemi.com/f/nordic-q-a/12165/fast-advertising-and-slow-advertising (documentation link broken)
https://devzone.nordicsemi.com/f/nordic-q-a/8502/fast-vs-slow-advertising-where-is-the-border-between
But I don't see an answer to that question.
Also, how to specify indefinite advertising; ie, with no timeout?
Various threads have suggested that a timeout of zero should do it:
https://devzone.nordicsemi.com/f/nordic-q-a/7344/infinite-slow-adversiting
https://devzone.nordicsemi.com/f/nordic-q-a/7320/infinite-advertising-with-sd-8-0-0
But I can't see anything in any documentation which actually states that this is so.
Current (15.3.0) online Documentation: https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/lib_ble_advertising.html
As far as I know it's just a convenient feature. I actually extended that to support a "super slow" advertising interval after the slow advertising times out. I don't think it is a Bluetooth spec featureā¦
Yes, it's just for convenience and is optional to use. Apple recommends having both in their design guidelines: https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf (section 25.3)
Andy said:As far as I know it's just a convenient featur
Yes, that does seem to be the case.
It would be good to have an explicit statement - especially as it's used in the context of Directed advertising - which is something different.
I've also seen it suggested that slow advertising is "low power" - but unclear if that's purely because it is slow, or if there are other "special measures" to make it so ...
Andy said:With regards to the timeout value, you can find the documentation here
Thanks.
But I can't see that mentioned or linked anywhere in the documentation of the slow or fast advertising parameters?
awneil said:But I can't see that mentioned or linked anywhere in the documentation of the slow or fast advertising parameters?
Yeah I don't think it's linked anywhere.
awneil said:I've also seen it suggested that slow advertising is "low power" - but unclear if that's purely because it is slow
I think so, it's purely because it's slow.