Distance between two devices

MIT App Inventor Help
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I have 2 possible solutions:

  1. Using BluetoothLE:
  • Make the users enter their Bluetooth Address at installation and put it in a CloudDB (I'm afraid if it has privacy issues)
  • The users phone will continuously try to connect to any bluetooth device within its range whose address is in the database
  • Once connected, they will keep streaming (random) data between each other & check the RSSI strength of the signal.
  • If the strength passes a certain threshold you can be quite sure that the devices must be really close.
  1. QR Code:
  • One user generates a QR Code and the other scans it, hence conforming proximity.

I haven't ever worked with BLE so I can't conform whether it is possible or not.

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