Wifi door bell script for ddwrt

door_bell.sh

#!/bin/bash

# setup constants
CURRENT_LIST_PATH=/tmp/wifi_client_macs_current
PREVIOUS_LIST_PATH=/tmp/wifi_client_macs_previous

while [ "true" ]
        do
        # backup old file if it exists
        if [ -f $CURRENT_LIST_PATH ];
        then
                cp $CURRENT_LIST_PATH $PREVIOUS_LIST_PATH
        fi

        # grab MACs from 2.4Ghz radio
        wl -i eth1 assoclist | cut -d" " -f2 > $CURRENT_LIST_PATH

        # grab MACs from 5Ghz radio
        wl -i eth2 assoclist | cut -d" " -f2 >> $CURRENT_LIST_PATH


        # do something if desired mac appears in list
        if grep -Fxq "3C:15:C2:18:F1:8F" $CURRENT_LIST_PATH
        then
                echo "Justin is home"
        else
                printf "."
        fi
  sleep 1
done