Bluetooth RSSI measurement during discovery

Can the RSSI of a BT device be measured during discovery, i.e. before pairing? If so, how to do it in Android?

Thanks

Yes you can get the RSSI for the device discovered , See this

Not possible for a standard Android program: you have no visibility into non-paired devices from a non-system APK.

If you are on a rooted device and have the appropriate permission you can access the dbus socket used by the bluetooth subsystem and that information is available through the bluez api.