[jimiasty]

The time-of-flight is actually possible because of UWB radio. It's an additional chip to Bluetooth that can estimate distance between nodes with inch precision. Then using Bluetooth mesh these data are passed to other beacons and to phone where automapping is performed. Once we know location of nodes standard indoor positioning with Bluetooth beacons is performed.

Bluetooth range is aprox 100m and UWB range 70m, so that's the maximum distance between nodes. The more nodes you have the more accurate the shape is.

For a 1000 sqf office you would neeed probably 12-20 beacons. For a retail store more than a 100.