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.

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

The startup script is starting 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&