auto start a terminal with two lines of code

[hello_maxish]

I would like to do the following:

when Pi is boot the command line will be open then two lines will be executed one after the other:

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sudo systemctl stop my_puredata.service

then

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sudo systemctl start my_puredata.service

Is this possible?
How can I do so?

[NotRequired]

The two commands you posted does the same as:

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sudo systemctl restart my_puredata

But why would you need to restart it after boot?

[hello_maxish]

The two commands you posted does the same as:

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sudo systemctl restart my_puredata

Is it complicated to make pi run this command on boot?
How can I do so?

But why would you need to restart it after boot?

For some reason only after restarting the service the pd patch is loading. if I don't do so it keep crashing

[NotRequired]

Do you have any detailed info / logs about the errors? Sounds like the service is started before a required feature is available and fixing that would be the better option..

EDIT: And what exactly is "pd patch"?

[hello_maxish]

PD is software you can make music with. Patch is like a file that make certain stuff. In my case it is playing back some audio files.

here is the error: https://imgur.com/a/KcsbRuK

When I start the same patch using the same script but without a USB audio interface is working just fine.

When I start the same patch with a USB audio interface but using the autostart file: "sudo nano /etc/xdg/lxsession/LXDE-pi/autostart"
Is also working just fine.

But the combination of the USB audio interface and the service script is just not working

[NotRequired]

I cannot se the source of the systemd service, but you could try to add:

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[Unit]
...
After=sound.target

...

[hello_maxish]

service script is:

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[Unit]
Description=My PureData service

[Service]
Type=simple
LimitNOFILE=1000000
ExecStart=/usr/bin/puredata -nogui -open  /home/pi/mypatch.pd
WorkingDirectory=/home/pi
User=pi
Group=pi
Restart=always
# Restart service after 10 seconds if service crashes
RestartSec=10

[Install]
WantedBy=multi-user.target

where should I add:

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After=sound.target

What does After mean?

[thagrol]

I cannot se the source of the systemd service, but you could try to add:

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[Unit]
...
After=sound.target

...

That may not help especially if audio I/O is required. RPiOS uses pulse audio which in the default configuration is not started until a user logs into the desktop.

It may be necessary to run pulse audio in systemwide mode. Refer to the pulseaudio docs for that (google et al know where to find them).

[thagrol]

What does After mean?

It means don't start (or try to start) this service before the listed targets have been reached orthe listed services have been started. It's often used in conjunction with "Required="

Have a read of the systemd docs for more (again a web search will find them).

If you've not seen it, you may find Running A Program At Start Up A Beginner's Guide to be of interest.

[hello_maxish]

Is there anything wrong with open the PD file using the autostart folder

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sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

I might need to disabled completely the builtin Pi audio card?

[thagrol]

Is there anything wrong with open the PD file using the autostart folder

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sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

I might need to disabled completely the builtin Pi audio card?

Yes. That will start it at every desktop login by any user. However that may not matter to you. Use your target user's autostart file as outlined in section 5.1.1 of the document I linked to above.

If you do go the autostart route disable your systemd service or you'll likely get multiple copies running.

Can't comment on whether you need to disable the built in audio or not.