From 33d22addae4ef2e7d1de3e91b5d6ed7564d2e81e Mon Sep 17 00:00:00 2001
From: justmarvinn <justmarvinnn@gmail.com>
Date: Mon, 5 May 2025 23:26:44 +0200
Subject: [PATCH] hardware reset fixes

---
 README.md         | 24 +++++++++++-------------
 healthcheck-timer |  6 +++---
 install.sh        |  4 ----
 script            | 37 +++++++++++++++++++++++++------------
 service           |  2 +-
 5 files changed, 40 insertions(+), 33 deletions(-)

diff --git a/README.md b/README.md
index b438a59..ba0c998 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,11 @@
+## Dependencies
+
+### Ubuntu
+```SHELL
+sudo apt remove -y inetutils-ping
+sudo apt install -y ppp iputils-ping
+```
+
 ## Install
 
 ### Ubuntu
@@ -9,27 +17,17 @@ curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/install.sh" |
 
 - Start & enable on startup
 ```SHELL
-sudo systemctl start sim800
-sudo systemctl enable sim800
 sudo systemctl start sim800-healthcheck.timer
 sudo systemctl enable sim800-healthcheck.timer
 ```
 
-- Stop
+- Stop & disable on startup
 ```SHELL
-sudo systemctl stop sim800
 sudo systemctl stop sim800-healthcheck.timer
+sudo systemctl disable sim800-healthcheck.timer
 ```
 
-- Restart
+- Restart immediately
 ```SHELL
 sudo systemctl restart sim800
 ```
-
-## Dependencies
-
-### Ubuntu
-```SHELL
-sudo apt remove -y inetutils-ping
-sudo apt install -y ppp iputils-ping
-```
diff --git a/healthcheck-timer b/healthcheck-timer
index fbb5af6..e2f0383 100644
--- a/healthcheck-timer
+++ b/healthcheck-timer
@@ -2,11 +2,11 @@
 
 [Unit]
 Description=SIM800 healthcheck timer
-After=sim800.service
+After=rc-local.service
 
 [Timer]
-OnBootSec=1min
-OnUnitActiveSec=1m
+OnBootSec=2min
+OnUnitActiveSec=2m
 
 [Install]
 WantedBy=timers.target
diff --git a/install.sh b/install.sh
index 04c6b70..503128b 100644
--- a/install.sh
+++ b/install.sh
@@ -24,7 +24,3 @@ curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/healthcheck-s
 curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/healthcheck-timer" > /etc/systemd/system/sim800-healthcheck.timer
 
 chmod +x /etc/init.d/sim800c
-systemctl enable sim800
-systemctl start sim800
-systemctl enable sim800-healthcheck
-systemctl start sim800-healthcheck
diff --git a/script b/script
index 59c18e5..a57db2b 100644
--- a/script
+++ b/script
@@ -2,34 +2,47 @@
 
 # /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)
-	# echo "AT+CFUN=1,1" > /dev/ttyS3
-	# sleep 3
-	# echo "AT+IPR=115200" > /dev/ttyS3
-	# sleep 1
+	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
-	# sleep 3
-	# echo "+++" > /dev/ttyS3
-	# sleep 3
-	# echo "AT+CFUN=1,1" > /dev/ttyS3
-	# sleep 3
+	echo 0 > "/sys/class/gpio/gpio$PIN_NUMBER/value"
+	echo $PIN_NUMBER > /sys/class/gpio/unexport
 	;;
 
 restart|reload)
 	$0 stop
-	sleep 1
+	sleep 10
 	$0 start
 	;;
 
 healthcheck)
-	if ! ping -I ppp0 -c 5 -W 5 1.1.1.1 > /dev/null; then
+	# 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
+		systemctl restart sim800.service
+		# $0 restart
 		exit 1
 	else
 		echo "Healthcheck passed"
diff --git a/service b/service
index 98ed7ad..86bd732 100644
--- a/service
+++ b/service
@@ -6,9 +6,9 @@ After=rc-local.service
 
 [Service]
 Type=forking
-# PIDFile=/run/ppp0.pid
 ExecStart=/etc/init.d/sim800c start
 ExecStop=/etc/init.d/sim800c stop
+# PIDFile=/run/ppp0.pid
 # Restart=on-failure
 # RestartSec=5s