openhaystack VS cat-localizer

> For Find My, since they can even locate switched off phones

They can't. Find My is actually truly end-to-end encrypted, at least the version used for when a device is off (I'm not 100% sure how encrypted the self-reported version is for powered on iPhones with data).

Copy-pasting my summary about how Find My works from another comment in this post:

> The master private key used by the system is generated locally and never leaves your Apple devices in a state that anyone except your devices can read it.

> The master key is used to derive an AirTag specific private key which is provisioned to the AirTag and is in turn combined with an increasing counter which generates a third private key that's never stored anywhere. The ID broadcast is the public key of this third key. It changes every 30 minutes or 1 hour, I forget which.

> Other devices see this key, use it to encrypt their own location, and upload that encrypted blob along with the public key to Find My, and in order for Apple to even know which account the encrypted blob they can't decrypt belongs to I have to actually request the location of my AirTag by locally deriving the keypair it used for a certain point in time.

This has all been proven through [1] where they read the whitepaper (which I can't for the life of me find now but know exist because I've read it, or at least parts) and implemented OpenHaystack which proves Apple aren't lying about anything because if they did then OpenHaystack wouldn't work.

1: https://github.com/seemoo-lab/openhaystack

find my network

Much more nuance than that. You can't just tap into the networks. More information here https://github.com/seemoo-lab/openhaystack

You can actually create your own, using Apple's "find my" network. See OpenHaystack

This is the way I would do it. You can even track where in the house the item is.

They are ESP32 with builtin power supply, I use them for almost everything. Temperature sensors (with the addon!), heater control, cat locator and, yes, for power monitoring. I set `PowerOnState` to `4` in Tasmota. Relays usually fail because of switching cycles, being always on is much less taxing.

I agree that gutting a chip reading door and using the mechanism to hold down the curtain of your door might be a viable solution, but to answer the actual question: https://github.com/filipsPL/cat-localizer

Look into cat-localizer, it uses BLE beacons.

The first time I read the post I also assumed the phones are the beacons and was about to suggest the cat-localizer, but actually OP is asking for the phones doing the tracking.

finally, a way to locate my cat in my house