bash amazon dash handler

amazon-dash.sh

#!/bin/bash
MAC_ON="18:74:2e:26:95:d9"
MAC_PAMPERS="b4:7c:9c:bd:eb:f0"

function onClick {
    #code to be ran on click
    #node ./mqtt.js
    #mosquitto_pub -h 192.168.1.12 -t cmnd/chevet2/power -m TOGGLE
    found_mac=$2
    if [[ $found_mac == *"$MAC_ON"* ]]; then
        END1=$(date +%s);
        diff=`echo $((END1-START1)) | awk 'int($1%60)'` # Get time since last click.
        if [ $(($diff)) -gt 3 ] # wait more than 3 seconds after last click - tcdump has multiple outputs.
        then
          START1=$(date +%s)
          mosquitto_pub -h 192.168.1.12 -t cmnd/chevet2/power -m TOGGLE
        fi
    elif [[ $found_mac == *"$MAC_PAMPERS"* ]]; then
        END2=$(date +%s);
        diff=`echo $((END2-START2)) | awk 'int($1%60)'` # Get time since last click.
        if [ $(($diff)) -gt 3 ] # wait more than 3 seconds after last click - tcdump has multiple outputs.
        then
          START2=$(date +%s)
          mosquitto_pub -h 192.168.1.12 -t cmnd/salon/power -m TOGGLE
        fi
 fi
}

START1=$(date +%s);
START2=$(date +%s);
tcpdump -l -i eth0 ether host "$MAC_PAMPERS" or ether host "$MAC_ON" | while read b; do
    onClick $b & # run in background
done