Triggering / Injecting a command as soon as Node Red is up

[Matrod]

Hi everyone,

I was wondering if there´s a way to activate an inject node as soon as Node-Red instance is up and running in Linux (i.e. after stopping / re-starting it or a reboot). Is there something a la "autoexec.bat" used back in the old DOS days?

My goal is to change a LED color to know my Node-Red install is running properly.

My current set-up: Raspberry Pi with Ninja Cape (Arduino) running Node Red 0.13

Any help would be greatly appreciated.

Thanks!

[Nicholas O'Leary]

The Inject node has an option to 'inject once on start' which is what you want.

Nick

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[Matrod]

Hi Nick,

Thanks for your answer. That´s what I thought, nonetheless, the documentation says:

The Inject once at start option actually waits a short interval before firing to give other nodes a chance to instantiate properly.

I tried checking this at the Inject node and it did not work. I need it to fire once as soon the Node-Red instance is started, not to be triggered manually (pushing the button).

Any ideas would be appreciated.

Take care!

[Nicholas O'Leary]

That 'short interval' is 100ms... is that really not sufficient?

[Matrod]

Hi again,

The time interval should be enough, but for some reason, it is not working. Any ideas?

I checked the option, restarted the Pi and still does not work.

Thanks again.

[Dave C-J]

Is this feeding into a good pin node ? If so they do take a long time to initialise (hence why they have their own set initial state option). If not try adding a delay node after the inject... 0.5 sec or whatever makes sense/works.