"Fast Advertising", "Slow Advertising", and indefinite advertising.

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/12165/fast-advertising-and-slow-advertising (documentation link broken)


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:



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

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  • 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 ...

    With regards to the timeout value, you can find the documentation here


    But I can't see that mentioned or linked anywhere in the documentation of the slow or fast advertising parameters?