Android Question Automatic wireless devices ID replacement

[peacemaker]

HI, All

It's the question about an algorithm, a solution, how to build the system.

1) We have the system of wireless Android devices (sensors) with switched off screens.
2) They have our app and use WiFi always on (sending accelerometer and battery info). No buttons and screen available for the end-user.
3) Each 2 sensors is the pair controlling left and right object sides, so we have 14 devices, 7 pairs that control 7 objects at the left and right sides.
4) The position of each sensor must be fixed, to identify the controlling object. And moreover - fixed in each pair.
5) Sensors must be re-charged periodically, when battery goes low.

Any ideas how to swap a sensor to a recharged one with the same ID information ?
Question is, of course, about the fully automatic process. Manual setting the ID info is possible, sure (WiFi socket data exchange).
But best solution to just replace the device and make some data exchange, to replace an OLD_sensor to a NEW_sensor with the same id info (Object X, left side).

I did long ago the system of Bluetooth signal navigation based on RSSI signal strenth. But seems, here cannot be used for sure.
NFC (for manual sensors data exchange) needs the screen that is switched on, that is not allowed...

Any ideas ?

 

[rosippc64a]

If you can't use RSSI signal strength, then you can use the battery level info. The new device could change id with the device what has the lowest battery level.
But for this need to be only one lowest...

 

[peacemaker]

Hmmm, do you mean replace only the one sensor during one time ?
And pass the id from low-battery sensor1 to the sensor2...

But if several sensors with battery OK...