mqtt_server.service

#sudo nano /etc/systemd/system/mqtt_server.service
#sudo systemctl daemon-reload
#sudo systemctl enable mqtt_server.service
#sudo systemctl start mqtt_server.service

[Unit]
Description=MQTT Server

[Service]
Type=oneshot
ExecStart=/home/pi/Desktop/raspberry_mqtt_server/start.sh

[Install]
WantedBy=multi-user.target