mosquitto.service

[Unit]
Description=MQTT v3.1 message broker
After=network.target
Requires=network.target
 
[Service]
Type=simple
ExecStart=/usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf
Restart=always
 
[Install]
WantedBy=multi-user.target

Using systemd start up for Mosquitto:

Mosquitto broker does not use systemd for start up. In order to remove the old init system, follow the procedure below:

sudo systemctl stop mosquitto
sudo update-rc.d mosquitto remove
sudo rm /etc/init.d/mosquitto

After removing the init.d script for Mosquitto broker, Create the systemd unit file
sudo vim /etc/systemd/system/mosquitto.service