diff --git a/healthcheck-service b/healthcheck-service
new file mode 100644
index 0000000..065267b
--- /dev/null
+++ b/healthcheck-service
@@ -0,0 +1,8 @@
+# /etc/systemd/system/sim800-healthcheck.service
+
+[Unit]
+Description=SIM800 Healthcheck service
+
+[Service]
+Type=oneshot
+ExecStart=/etc/init.d/sim800c healthcheck
diff --git a/healthcheck-timer b/healthcheck-timer
new file mode 100644
index 0000000..fbb5af6
--- /dev/null
+++ b/healthcheck-timer
@@ -0,0 +1,12 @@
+# /etc/systemd/system/sim800-healthcheck.timer
+
+[Unit]
+Description=SIM800 healthcheck timer
+After=sim800.service
+
+[Timer]
+OnBootSec=1min
+OnUnitActiveSec=1m
+
+[Install]
+WantedBy=timers.target
diff --git a/install.sh b/install.sh
index e91ef9f..4b52e59 100644
--- a/install.sh
+++ b/install.sh
@@ -8,7 +8,8 @@ fi
 set -e
 
 apt update
-apt install -y ppp curl
+apt remove -y inetutlis-ping
+apt install -y ppp curl iputils-ping
 
 mkdir -p /etc/ppp/chatscripts
 mkdir -p /etc/ppp/peers
@@ -19,7 +20,11 @@ curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/chat" > /etc/
 curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/peer" > /etc/ppp/peers/sim800c
 curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/script" > /etc/init.d/sim800c
 curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/service" > /etc/systemd/system/sim800.service
+curl -sSL "https://git.openergy.ru/LUCKFOX/SIM800C/raw/branch/main/healthcheck-service" > /etc/systemd/system/sim800-healthcheck.service
+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 ca95b94..59c18e5 100644
--- a/script
+++ b/script
@@ -4,25 +4,41 @@
 
 case "$1" in
 start)
-	echo "AT+CFUN=1,1" > /dev/ttyS3
-	sleep 3
-	echo "AT+IPR=115200" > /dev/ttyS3
+	# echo "AT+CFUN=1,1" > /dev/ttyS3
+	# sleep 3
+	# echo "AT+IPR=115200" > /dev/ttyS3
+	# sleep 1
 	pon sim800c
 	;;
+
 stop)
 	poff sim800c
 	# sleep 3
 	# echo "+++" > /dev/ttyS3
 	# sleep 3
-	echo "AT+CFUN=1,1" > /dev/ttyS3
-	sleep 3
+	# echo "AT+CFUN=1,1" > /dev/ttyS3
+	# sleep 3
 	;;
+
 restart|reload)
 	$0 stop
+	sleep 1
 	$0 start
 	;;
+
+healthcheck)
+	if ! ping -I ppp0 -c 5 -W 5 1.1.1.1 > /dev/null; then
+		echo "Healthcheck failed"
+		systemctl restart sim800
+		exit 1
+	else
+		echo "Healthcheck passed"
+		exit 0
+	fi
+	;;
+
 *)
-	echo "Usage: $0 {start|stop|restart}"
+	echo "Usage: $0 {start|stop|restart|healthcheck}"
 	exit 1
 esac
 
diff --git a/service b/service
index 0d0d64f..98ed7ad 100644
--- a/service
+++ b/service
@@ -6,11 +6,11 @@ After=rc-local.service
 
 [Service]
 Type=forking
-PIDFile=/run/ppp0.pid
+# PIDFile=/run/ppp0.pid
 ExecStart=/etc/init.d/sim800c start
 ExecStop=/etc/init.d/sim800c stop
-Restart=on-failure
-RestartSec=5s
+# Restart=on-failure
+# RestartSec=5s
 
 [Install]
 WantedBy=multi-user.target