nRF Connect iOS App: Is Disconnect Immediate?

[FluffyMarshMallow26]

Hello - we're using "nRF Connect" from the Apple App Store for the development of our project.

First, thank you for making this tool available and free for everyone to use.

Second, I've a question regarding disconnecting.  I can connect easily to my BLE peripheral and see the results in the app; however, when I connect and then immediately disconnect, I notice from my peripheral log that it does not register a disconnect until (typically) 12 seconds later, give or take 2 seconds.  In some cases it takes 6.3 seconds but usually not.  On the other hand, if I connect using the nRF Connect app but then immediately disabled "Bluetooth" in my Apple phone's settings menu, the peripherals logs the disconnect immediately.

My question:  Is this a function of the nRF Connect application maintaining a connected status for a fixed window interval or could this be something else (a Bluetooth signalling standard, sunspots, owl infestation, my terrible code, etc.)?

Thanks for any response!

[FluffyMarshMallow26]

Thank you - we are going to chalk this one up to the library we are using (ArduinoBLE) and assume that it is overhead associated with the connection process not allowing a rapid break.  In any case, it is not that important, but we were curious nonetheless.  We appreciate you taking time to respond!