Switching network configurations on a TP-Link TL-MR3020 with OpenWrt (12.09 Attitude Adjustment) using the sliding switch. Based on the sample scripts at: https://forum.openwrt.org/viewtopic.php?pid=172111#p172111 and https://forum.openwrt.org/viewtopic.php?pid=172110#p172110

00-button

# based on
# https://dev.openwrt.org/browser/trunk/target/linux/atheros/base-files/etc/hotplug.d/button/00-button
# https://forum.openwrt.org/viewtopic.php?pid=172110#p172110

. /lib/functions.sh

export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

do_button () {
	local button
	local action
	local handler
	local min
	local max

	config_get button $1 button
	config_get action $1 action
	config_get handler $1 handler
	config_get min $1 min
	config_get max $1 max

	if [ "$button" = "3g" -o "$button" = "wisp" -o "$button" = "ap" ] ; then
		if [ "$ACTION" = "released" ] ; then
			if [ "$BUTTON" = "BTN_1" ] ; then
				export BUTTON=3g
				export ACTION=pressed
			elif [ "$BUTTON" = "BTN_0" ] ; then
				export BUTTON=wisp
				export ACTION=pressed
			fi
		elif [ "$BUTTON" = "BTN_0" -o "$BUTTON" = "BTN_1" ] ; then
			if BTN_0_pressed && BTN_1_pressed ; then
				export BUTTON=ap
			fi
		fi
	fi

	[ "$ACTION" = "$action" -a "$BUTTON" = "$button" -a -n "$handler" ] && {
		[ -z "$min" -o -z "$max" ] && eval $handler 
		[ -n "$min" -a -n "$max" ] && {
			[ $min -le $SEEN -a $max -ge $SEEN ] && eval $handler 
		}
	}
}

config_load system
config_foreach do_button button

BTN_0_pressed

#!/bin/sh
grep -qe "sw1.*in  hi" /sys/kernel/debug/gpio

BTN_1_pressed

#!/bin/sh
grep -qe "sw2.*in  hi" /sys/kernel/debug/gpio

network_config

#!/bin/sh /etc/rc.common

START=15
boot() {
	/usr/local/sbin/set_network_config
}

set_network_config

#!/bin/sh

# based on https://forum.openwrt.org/viewtopic.php?pid=172111#p172111

ME=$(basename $0)
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

if BTN_1_pressed ; then
	if BTN_0_pressed ; then
		CONFIG=ap
	else
		CONFIG=wisp
	fi
else
	CONFIG=3g
fi

SRC="/etc/config/$CONFIG"
DEST=/tmp/network_config

if [ ! -d "$SRC" ] ; then
	logger -t "$ME" -p "user.warn" "$SRC is not a directory"
	exit 1
fi

if [ -L "$DEST" ] ; then
	CUR=$(cd "$DEST"; pwd -P)
	if [ "$CUR" = "$SRC" ] ; then
		logger -t "$ME" "Already using $CONFIG config"
		exit 2
	fi
fi

logger -t "$ME" "Using $CONFIG config"
ln -sfn "$SRC" "$DEST"

setup

chmod a+x BTN_0_pressed BTN_1_pressed set_network_config update_network_config network_config
mkdir -p /usr/local/sbin
mv BTN_0_pressed BTN_1_pressed set_network_config update_network_config /usr/local/sbin
mkdir -p /etc/hotplug.d/button
mv 00-button /etc/hotplug.d/button
mv network_config /etc/init.d

opkg update
opkg install flock

cd /etc/config
mkdir 3g
mv network wireless 3g
cp -r 3g wisp
cp -r 3g ap
ln -s network /tmp/network_config/network
ln -s wireless /tmp/network_config/wireless
# configure files in 3g / wisp / ap directories for each corresponding mode
# to use uci / luci to configure, create the /tmp/network_config symbolic link to point to the correct directory, e.g.
#     ln -s /tmp/network_config /etc/config/3g
# or configure the settings before moving the config files

/etc/init.d/network_config enable

uci add system button
uci set system.@button[-1].button=3g
uci set system.@button[-1].action=pressed
uci set system.@button[-1].handler=update_network_config
uci add system button
uci set system.@button[-1].button=wisp
uci set system.@button[-1].action=pressed
uci set system.@button[-1].handler=update_network_config
uci add system button
uci set system.@button[-1].button=ap
uci set system.@button[-1].action=pressed
uci set system.@button[-1].handler=update_network_config
uci commit system

reboot

update_network_config

#!/bin/sh

ME=$(basename $0)
export PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin

(
	flock -n 9 || exit 1

	(
		sleep 1

		if set_network_config ; then
			. /etc/diag.sh
			get_status_led
			status_led_set_timer 200 200

			logger -t "$ME" "Reloading network"
			/etc/init.d/network restart

			status_led_on
		fi
	) 9>&-

) 9>/tmp/update_network_config.lock