openwrt wan auto reconnect hotplug script

99-keepwanalive

#!/bin/bash
# Place me in /etc/hotplug.d/iface/99-keepwanalive
IFNAME='wlan0'

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

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

fi