Application cannot be autorun during startup on raspberry with systemd

Benedek Talos

Hi Together,

I am trying to automatically run a QGuiApplication on a raspberry pi 4 running raspbian with systemd.
The problem is, that the application is not starting automatically during startup, but if I trigger it manually with systemd (systemctl start <appname>), it starts properly, and the service is up and running.

Here is my .service file:

[Unit]
Description=Qt application autostart

[Service]
Type=simple
User=pi
Environment="DISPLAY=:0"
WorkingDirectory=/home/pi/Desktop/new_HMI_version_b_r/build
ExecStart=/home/pi/Desktop/new_HMI_version_b_r/build/BB_HMI_prototype

[Install]
WantedBy=graphical.target

Questions:

I left "Wanted by =" attribute open, as my understanding is, it lists dependents, which shalll be executed after my application is started, and since i dont have any dependents for now, its OK to ignore it. Correct?
I gave "WorkingDirectory=" the build folder of the application. I thinks its OK, but I have seen many examples on the internet that gave some system folder of the Pi... Shall something else be here?
What shall I put to attribute "WantedBy="? I think its the safest to give a dependency that my application launches as the last one triggered by systemd, so that every possible dependency is ready by then. Can I somehow explicitly force it to be started last by systemd?

Thank you for the answers in advance!

SGaist

Hi and welcome to devnet,

This thread and some others on this forum are about the same subject.

You may find there some information to get you going.