https://www.beaconzone.co.uk/blog/obtaining-distance-from-rssi/ see also https://iotandelectronics.

BeaconZone BlogSupport
RSSI is the signal strength at the Bluetooth receiver. The signal type, for example, iBeacon, Eddystone or sensor beacon is irrelevant. The value of the RSSI can be used to infer distance.
IOT and Electronicsiotbymukund
I am sure many people are working on the BLE technology and even on the projects like Indoor Location Positioning, distance approximation from the RSSI value of the BLE beacon. This Article is shor
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