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For Google Cast most likely. Local discovery of Cast recipients. Casting to your TV etc is a popular feature

But that's most likely on your local network. No need to use Bluetooth for this, when you have simple local UDP multicast.

Also: Using Bluetooth for discovery of your units suck. I live in an area with lots of houses close by each other, and I see at least 3 Apple TV's in my iPhone's AirPlay menu which are not on my network, and there's no way for me to get rid of them.

Apple, Google and friends: Stop. Trying. So. Hard! We're all on the same network. It's OK. No need to look further.

> I see at least 3 Apple TV's in my iPhone's AirPlay menu which are not on my network, and there's no way for me to get rid of them

Write a script to stream Rick Astley's most popular clip to them in a loop, wait for the owners to turn off P2P Airplay.

But why should I have to? Why should I look outside my network when attempting to connect to my devices?

It's the P2P AirPlay design which needs a justification, not me wanting to get it disabled.

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