This idea reminds me of Apple’s approach to Find My offline device: [1] > Find My can help you locate a missing device — even if it’s offline and sleeping — by

This idea reminds me of Apple’s approach to Find My offline device: [1] > Find My can help you locate a missing device — even if it’s offline and sleeping — by sending out Bluetooth signals that can be detected by Apple devices in use nearby. These devices then relay the detected location of your device to iCloud so you can locate it in the Find My app. It’s all anonymous and encrypted end-to-end so no one, including Apple, knows the identity of any reporting device. [1]: https://www.apple.com/icloud/find-my/ https://www.apple.com/icloud/find-my/