How to measure the bluetooth strength between two Hc05 bluetooth?

How to measure the Bluetooth strength between two Hc05 Bluetooth? is there any code or method to measure it?

I would like to find out the Bluetooth strength between two Hc05 Bluetooth? since I would like to use this method to conduct the indoor positioning.

There have been many Threads about measuring signal strength and all of them that I have seen say very clearly that it cannot be used for measuring distance.

If you need to locate something accurately indoors there is the expensive Posyx system or you may be able to create something equivalent to three fixed lighthouses using visible light or maybe Infra Red and have the device needing to know its position scan for the relative positions of the lights.

...R