The doorbell at the house is broken. I want something smarter: detect when a friend's phone is present, and send me a note.
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Replying to @peat
@peat I do this at home by scanning the DHCP leases on my home router in real time. I get alerted within seconds... aaron.pk/r4Vo3

Apr 28, 2014 · 7:52 PM UTC

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Replying to @aaronpk
@aaronpk That's perfect! :D
Replying to @aaronpk
@aaronpk @peat watching for a MAC addr in the DHCP leases is clever. Installing a door strike sounds like the hard part.
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