Android Question Devices map: positions of several Android-wireless-devices

peacemaker

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Hi, All

1) Say, we have the local WiFi network of several Android-devices, in one WiFi-network (maybe the central router, and + extra WiFi-repeaters-amplifiers). Devices are sensors, working with the switched off screens (screen is unaccessible).
2) One device with low battery must be replaced by another device (fully charged), but the system must know that "Sensor1(20% battery) should be now replaced by Sensor16(100%) at the same point X"

So, what communication ideas may be used to make such exchange maximally automatically ?
I thought about NFC (touch 2 devices to data exchange), but this is only with unlocked switched on screens, as i can understand...
 
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