openwrt wan auto reconnect hotplug script

99-keepwanalive

# Place me in /etc/hotplug.d/iface/99-keepwanalive

if [ "$ACTION" = "ifdown" -a "$INTERFACE" = "wan" ]; then

  COUNTER=0
  PASS=0
  
  while [ $PASS -eq 0 ]
  do
    grep "up" /sys/class/net/eth0/operstate > /dev/null
  
    if [ $? != "up" ]; then
  
      let COUNTER++
      logger -t DEBUG "Attempt #${COUNTER} to reconnect wan"
  
      ifup wan
      sleep 15 #sec
      
    else
      PASS=1
    fi
  done

fi

Great idea !
much better than those using pings and corn jobs !
Just that there are a few mistakes ...
This one goes to infinite loop .
as "ifup wan" takes wan down and then again up , if wan is already up, the wan connection redials every 15 seconds !
also, /sys/class/net/eth0/operstate needs to be set to appropriate interface , depending on each user
Have corrected the same , available here : https://gist.github.com/ninadpchaudhari/6561841ffc3667b1e5ee

I dont think merge request can be sent to Gists !

maybe just set once "ifup wan" without while loop and all other things...