[jmgrosen]

If you have discoverable mode on, sure. But typically that's specifically user-activated and only lasts for a couple of minutes.

[nitrogen]

I'm working at a place that uses a simple app running on a Raspberry Pi to update a dashboard whenever a known Bluetooth MAC comes into the building, with no need to turn on discoverability or pair with the Pi.

[ashah]

flawed metrics buddy, bluetooth mac address is randomized.

[nitrogen]

Not on the iPhones and Android phones of the people whose names are consistently correctly displayed on the dashboard. The MAC address had to be entered into the dashboard software manually, but no interaction was required on the phone whatsoever.