OpenWRT - Wifi rule on button press

wifi-toggle.sh

#!/bin/sh
MIN_TIME=0630 # Time of the day from when the wifi should be enabled
MAX_TIME=2215 # Time of the day until when the wifi will stay enabled

function is_disabled() {
  [[ "$(uci show firewall.@rule[0].enabled 2>/dev/null)" =~ "enabled='0'" ]]
}

function led_on() {
  echo "default-on" > /sys/class/leds/$1/trigger
}

function now() {
  date +"%H%M"
}

function to_min_of_day() {
  time=$1
  hour="${time:0:2}"
  minute="${time:2:4}"
  expr $hour \* 60 + $minute
}

function is_ok_time() {
  time=`to_min_of_day $1`
  start=`to_min_of_day $MIN_TIME`
  end=`to_min_of_day $MAX_TIME`
  [[ $time -ge $start && $time -lt $end ]]
}

function led_off() {
  echo "none" > /sys/class/leds/$1/trigger
}

function set_enabled() {
  echo "enable=$1 ..."
  uci set firewall.@rule[0].enabled=$1
  uci commit
  service firewall reload
  echo "finished"
}

function enable() {
  set_enabled 1
  led_off "green:power"
  led_on "red:power"
}

function disable() {
  echo "disabling..."
  set_enabled 0
  led_off "red:power"
  led_on "green:power"
}

case $1 in
  enable)
    enable;;
  disable)
    disable;;
  check)
    if is_disabled; then
       echo "disabled"
case $1 in
  enable)
    enable;;
  disable)
    disable;;
  check)
    if is_disabled; then
       echo "disabled"
       exit 1
    else
       echo "enabled"
       exit 0
    fi
    ;;
  *)
    if is_disabled; then
      if is_ok_time `now`; then
        enable
      else
        echo "out of ok time"
      fi
    else
      disable
    fi
    ;;

esac