Tracking with wifi and a mac address

wifitrack.sh

#!/bin/sh
 
client="E0:F8:47:86:01:C2" #iPhone
logfile="/jffs/wifilog-$(date +"%m%d")-$client.log"
assoclist=$(wl assoclist | grep $client)
notconnmsg="$(date +"%T") Disconnected"
connmsg="$(date +"%T") Connected"
 
if [ ! -f $logfile ]; then
    echo $notconnmsg > $logfile
fi
 
if [ -z $assoclist  ]; then # Client is not connected
  echo $(tail -n 1 $logfile) - $notconnmsg
  if [ -z $(tail -n 1 $logfile | grep "Disconnected") ]; then # Last log is connected show not connected message
    echo $notconnmsg >> $logfile    
  fi  
else # Client is connected
  echo $(tail -n 1 $logfile) - $connmsg
  if [ -z $(tail -n 1 $logfile | grep "Connected") ]; then  # Last log is not connected show connected message
    echo $connmsg >> $logfile    
  fi  
fi