Automatic start by using systemd

The content of systemd unit file /lib/systemd/system/aquarium-ctrl.service as following:

[Unit]

Description=Aquarium Control Application

After=multi-user.target


[Service]

Type=forking

ExecStart=bash /usr/local/bin/aquarium-ctrl-startup

[Install]

WantedBy=multi-user.target

Upon creation/modification of the unit file, one must run the command sudo systemctl daemon-reload in order to activate the changes.

Then, also the command sudo systemctl enable aquarium-ctrl.service is required to enable the service.

For starting the control application manually via systemd, one can use the command sudo systemctl start aquarium-ctrl.service.

When running the application in a configuration that utilises the relay board, the startup script needs to start the screen application prior to the control application in order to set the baud rate of the relay boards:

screen -dm /dev/ttyUSB0 19200

screen -dm /dev/ttyUSB1 19200

/usr/local/bin/aquarium-ctrl -f On -r On -u Off -d On -s On -g On -t Off -b On > /dev/null&