Virtual Presence Device

[JDRoberts]

Lots of people have done variations on it, I think the following is the most recent:

Presence sensor... device associated with local wifi

This is going to be oddball, but given my router knows when a device is connected to wifi and given I know the device mac (or dns name) I should be able to make a presence device type that polls the local network for the existence of said MAC or DNS name currently associated with the AP, and if so… PRESENT So on linux something like this works on an Asus router/AP arp | cut -d ' ' -f 2,4 | tr A-F a-f | sort -t ' ' -k 2 | grep -v incomplete | awk '{ print $2 " " $1}' > /tmp/f1 cat /var/lib/misc/dnsmasq.leases | cut -d ' ' -f 2,4 | sort > /tmp/f2 awk 'NR==FNR {h[$1] = $2; next} {print $1,h[$1]}' /tmp/f2 /tmp/f1 | grep -q <MAC or DNS NAME> echo $? would output 0 if the user is present or 1 otherwise. Make this thing a script that is run via an http call, and you’d have a presence v…

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