Sending Commands from OpenMCT?

[ljburtz]

Hello, from the tutorials I understand the rich visualization capabilities of OpenMCT.
Is it also possible to create a button that triggers a script (or Yamcs command)?

looking online it seems buttons with a command field that triggers a script was possible in an old version of OpenMCT. but I don't see the 'button' object in the CREATE menu.

https://youtu.be/sFui3dFBLuo?si=YCrv8aIMbftNHSaa

What is the recommended way to have a button currently? custom plugin?
Thank you for any pointers

[Sim0nV]

The button in that image is a custom button plugin created by the person who made that tutorial series.

You prob have to create your own plugin. The plugin from the tutorial sends an HTTP request based on the passed command and URL

Button plugin from their repo (warning the javascript is very outdated): https://gitlab.lrz.de/lls/vis-frame/-/blob/master/openmct/example/Button/plugin.js?ref_type=heads

[ljburtz]

thanks a lot for confirming.
beyond this example, is sending commands via OpenMCT only through custom plugins?

I just want to make sure I'm not missing something (the 'control' in the name openMCT) or if commanding is part of the roadmap?

[Sim0nV]

@ljburtz As far as I'm aware there are no default plugins which send commands. A reply from a couple years ago supports this: #3854 (comment)

If you have another web app which sends commands you can embed it within Open MCT using the Web Page plugin like akhenry suggests

[akhenry]

@ljburtz A generic "button" object that simply calls out to the URL is a pretty neat idea, and would have a lot of utility in different scenarios. As you mentioned, this would need to be a new custom plugin based on our view API. If you implement this please share it with us! Here's a simple example of a custom view in Open MCT - https://github.com/nasa/openmct-hello/tree/master/src

A fully-featured commanding capability is a high priority for us, but I don't have a timescale right now. In all likelihood what this would look like is a new commanding API that initially supports Yamcs, but which could be extended to support other commanding backends.

[ljburtz]

thanks a lot @akhenry, good to know that expanding Yamcs support in OpenMCT beyond telemetry visualization to also include commanding is high priority. that would be a significant unlock for us.

Do you know if the VIPER rover team was using OpenMCT only for visualization, not also for sending commands (via Yamcs)?