html5 - How to detect if an Android mobile is near a computer -


i'm developing piece of software consists on mobile clients , machine acting server. highly trusted environment (not public), don't care security.

i want clients allowed perform action if are, say, 2 meters server.

as client html5 app, better if server perform check, not clients (maybe clients can send position server , performs check), if cannot done, doesn't matter.

i have run out of ideas how can done. have thought bluetooth , geolocation, can detect if client @ least 5 meters nearby?

is remotely possible?

you can use sound waves this. these links might started:


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