Distance to a Bluetooth device can be measured using RSSI value. The following script will help you locate nearby unique BLE devices within a selected range.

This script scans for nearby unique Bluetooth devices within the given range using a well-known RSSI to distance formula.

Requirments

You need to have a BLE USB dongle BleuIO https://www.bleuio.com/
To run the script, you need a web application bundler. You can use parceljs. https://parceljs.org/getting_started.html
Instructions

git clone https://github.com/smart-sensor-devices-ab/device_within_range.git

Go inside the folder type in terminal

parcel index.html

The script will scan for five seconds for nearby devices within range. You can update the value based on your requirements.

You can also run this script from online at

https://smart-sensor-devices-ab.github.io/device_within_range/dist/index.html