Hello,
I use Airplay screen mirroring regularly in a work environment and sometimes accidentally leave the mirroring feature on after leaving the room. Apple's implementation doesn't really provide a very obtrusive indication that it is mirroring so am trying to solve this maybe with BTT - It doesn almost everything else! 
So my question is: I was wondering if there was a way that I could get BTT (or something else) to display a HUD message/permanent notification automatically while my screen is being Airplay screen mirrored?
Any ideas on solving this would be much appreciated!
Thanks.