Automatically switch on or off Wi-Fi according to an interface. Helpful if your mobile phone won't switch to mobile data if there is no internet access from Wi-Fi.

wifi_switch.sh

#!/bin/sh

# wifi_switch.sh
# hotplug.d script
# Automatically switch on or off wifi according to an interface
# helpful if your mobile phone won't switch to mobile data if there is no internet access from wifi
# Version		: 2.2.0
# Author		: xymopen <xuyiming.open@outlook.com>
# Licensed		: BSD 2-clause License

logger -t "wifi_switch" -s "action=${ACTION} device=${DEVICE} network=${INTERFACE}"

disable_each_wifi_iface () {
	local mode

	config_get mode "$1" mode

	if [ "$mode" = "ap" ]; then
		uci_set wireless "$1" disabled 1
	fi
}

enable_each_wifi_iface () {
	local mode

	config_get mode "$1" mode

	if [ "$mode" = "ap" ]; then
		uci_set wireless "$1" disabled 0
	fi
}

WAN_IF="wan"

if [[ "${INTERFACE}" = "${WAN_IF}" ]]; then
	. /lib/functions.sh

	case "${ACTION}" in
		"ifup")
			logger -t "wifi_switch" -s "wan is up. bring up wifi..."
			config_load wireless
			config_foreach enable_each_wifi_iface wifi-iface
			uci_commit wireless
			/etc/init.d/network reload
		;;
		"ifdown")
			logger -t "wifi_switch" -s "wan is down. shut down wifi..."
			config_load wireless
			config_foreach disable_each_wifi_iface wifi-iface
			uci_commit wireless
			/etc/init.d/network reload
		;;
		# use "connected" and "disconnected" for better
		# Internet connection detection if you have mwan3
	esac
fi