How to continuously measure the RSSI of a Bluetooth signal on multiple PCs/devices?
You can use multiple Linux machines to log the RSSI value of a BLE device. This can be done via BlueZ and the btmon command. Please see my answer here (specifically the Bluetooth Low Energy section) to see how this is done:-
https://stackoverflow.com/questions/24417017/bluetooth-le-signal-strength-linux/24417605#24417605