I've written a bunch more on the link (+photos are there), but essentially this uses 2 fingerprinting approaches: - retro-reflectivity of the camera sensor by looking at IR reflections. mixed results here. - wireless traffic (primarily BLE, also looking into BTC and wifi)
For the latter, I'm currently just using an ESP32, and I can consistently detect when the Meta Raybans are 1) pairing, 2) first powered on, 3) (less consistently) when they're taken out of the charging case. When they do detect something, it plays a little jingle next to your ear.
Ideally I want to be able to detect them when they're in use, and not just at boot. I've come across the nRF52840, which seems like it can follow directed BLE traffic beyond the initial broadcast, but from my understanding it would still need to catch the first CONNECT_REQ event regardless. On the bluetooth classic side of things, all the hardware looks really expensive! Any ideas are appreciated. Thanks!
These are two different protocols with different radio behaviour.
So beyond detecting the glasses themselves, which seem like the focus of the project; detecting recording is feasible at the point of transfer to a phone.
The issue is distinguishing it from any other high bandwidth Bluetooth device nearby, such as headphones.
I like my glasses and don't really agree with your goals (nor see the point of letting you know when someone's wearing them; in my city your device would be beeping constantly) so I'm not interested in helping unfortunately. But I do wish you luck, as I said I like the spirit.