Assume most of you may agree that mobile devices are mostly personal devices, interact with daily tasks, I like to get MAC address of WIFI/Bluetooth of devices so to track device (so the user) inside a building that GPS tracking is useless. I m working on building a multiple Google Home devices network tracking ble trackers/mobiles but I had to assign Bluetooth MAC address for every user. So the correlation between devices and users could be a nice addition on the API (some fields