Returning a value from an external command

fbrier

Is it possible to return a value from an external command? I will write the external command, so it could do anything, such as output a string to stdout. Specifically, I want the external command to parse the g-code of the current job, looking for specially formatted comments. If they are in the g-code, then certain GPIO pins would be enabled turning on a relay for that job, and turned off at its end.

Repetier

No, external command output gets logged to server log for error analysis but is not available. No server command has a return value.

I see several solution for this. Simplest solution is make it a synced external command, do gpio enabling. Define gpio in general settings->gpio as well. In job finished/job stopped g-code you can read the gpio with computed expression get_gpio_state and do whatever you wanted to do with it in gcoide (pin off) or call execute if you need that.

Alternatively make it a web service and use computed expression http_get taht you use with @set to store result in a global variable so you have the return value.

Last solution is script stores result in a file and exit script gets always called but reads the file to know what to do.