Hi Karl,
One way would be to install the nmcli command line utility
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sudo apt-get install network-manager
With this, you can scan for any wireless devices in the area (with signal strength) without them necessarily being on your WiFi network - a bit like what Fingbox does.
Edit: Actually, I lie, it's Kismet that does this -
https://gary-dalton.github.io/Raspberry ... ismet.htmlTypical command:
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nmcli d wifi
Here's a guide, (you will need step 4) but there may be better ones:
https://gary-dalton.github.io/Raspberry ... nmcli.html