seemoo-lab/openhaystack ? reverse-engineered prompt

Build me a macOS app that lets me create my own Bluetooth tracking tags and see their last known location on a map. I want to be able to add a tag with a name, icon, and color, generate a key for it, and then deploy it to a supported Bluetooth device like a BBC micro:bit over USB. The app should show a list of my items, let me refresh for new location reports, and let me click one to see when it was last updated.

Also include the device firmware side so the tag can advertise itself over Bluetooth and work with Apple’s Find My network. Keep it simple to use, but make it feel polished and clear for non technical users. If anything needs current Apple or macOS setup details, look up the latest docs online and follow the project’s existing approach.