#!/bin/bash

# /etc/init.d/sim800c

INTERFACE_NAME=ppp0
# see https://wiki.luckfox.com/Luckfox-Pico/Luckfox-Pico-GPIO for details
PIN_NUMBER=34

case "$1" in
start)
	if ip link show $INTERFACE_NAME > /dev/null 2>&1; then
		echo "Interface $INTERFACE_NAME already exists"
		exit 1
	fi

	if [ ! -d "/sys/class/gpio/gpio{PIN_NUMBER}" ]; then
		echo $PIN_NUMBER > /sys/class/gpio/export
	fi
	echo out > "/sys/class/gpio/gpio$PIN_NUMBER/direction"
	echo 1 > "/sys/class/gpio/gpio$PIN_NUMBER/active_low"
	echo 1 > "/sys/class/gpio/gpio$PIN_NUMBER/value"
	pon sim800c
	;;

stop)
	poff sim800c
	echo 0 > "/sys/class/gpio/gpio$PIN_NUMBER/value"
	echo $PIN_NUMBER > /sys/class/gpio/unexport
	;;

restart|reload)
	$0 stop
	sleep 10
	$0 start
	;;

healthcheck)
	# DNS names also available
	PUBLIC_ADDR=1.1.1.1
	PACKET_COUNT=5
	TIMEOUT=10
	if ! ping -I $INTERFACE_NAME -c $PACKET_COUNT -W $TIMEOUT $PUBLIC_ADDR > /dev/null 2>&1; then
		echo "Healthcheck failed"
		systemctl restart sim800.service
		# $0 restart
		exit 1
	else
		echo "Healthcheck passed"
		exit 0
	fi
	;;

*)
	echo "Usage: $0 {start|stop|restart|healthcheck}"
	exit 1
esac

exit 0