OPNsense reset WAN if no IP

# /usr/local/sbin/checkwan.sh
###################################

#!/bin/sh

gatewayIP=$(netstat -4rn | grep default | awk '{print $2}')
wanInterface="igb1"

echo "Gateway: $gatewayIP"
echo "WAN Interface: $wanInterface"
if [ -z $gatewayIP ]
then
  echo "NO Gateway"
  #Bring the interface down then up to renew the WAN DHCP
  ifconfig $wanInterface down
  ifconfig $wanInterface up
else
  # if return = 0 then host is reachable
  ping -c 1 $gatewayIP > /dev/null
  if [ $? -eq 0 ]
  then
    echo "Gateway Reachable"
  else
    echo "Gateway Unreachable"
    #Bring the interface down then up to renew the WAN DHCP
    ifconfig $wanInterface down
    ifconfig $wanInterface up
  fi
fi

######################################

#/usr/local/opnsense/service/conf/actions.d/actions_checkwan.conf

#####################################
[load]
command:/usr/local/sbin/checkwan.sh
parameters:%s
type:script
description:Check WAN Interface for IP and reset if none
message:Resetting WAN Interface for DHCP retrieval