Add modem-restart

modem-restart

@@ -0,0 +1,38 @@
+#! /bin/sh
+
+is_modem_available()
+{
+	if [ -z "$(lsusb | grep "2c7c:0125")" ]; then
+		return 1
+	fi
+
+	return 0
+}
+
+is_data_available()
+{
+	if ! nmcli c show --active | grep -e internet -e gsm > /dev/null; then
+		return 1
+	fi
+
+	return 0
+}
+
+TRY=0
+while :; do
+	if ! is_modem_available ; then
+		TRY=$((TRY + 1))
+		echo $(date) Restarting modem, $TRY try
+		systemctl restart eg25-manager
+		systemd-inhibit --what=sleep --why="Modem reset" sleep 60
+	elif [ $TRY -ne 0 ]; then
+		echo $(date): Modem restarted successfully
+		TRY=0
+	elif ! is_data_available; then
+		echo $(date): Restarting mobile data
+		systemd-inhibit --what=sleep --why="Restart mobile data" sleep 5
+		nmcli c up internet
+	fi
+
+	sleep 5
+done

modem-restart.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=Restarts eg25-manager if USB connection to the Quectel EG25 modem is lost
+
+[Service]
+User=root
+WorkingDirectory=/
+ExecStart=modem-restart
+Restart=always
+
+[Install]
+WantedBy=multi-user.target