Improving error reporting from backends

[Erik de Castro Lopo]

Michael Sweet wrote:
> STATE: messages can be written by the backend to report conditions
> like this.

Sorry, I'm rather new to CUPS and that was just a little terse for me.

Do you mean that in the backend I can do things like:

   fprintf (stderr, "STATE : Out of paper.\n") ;

and CUPS will pick it up for retrieval using the printer-state-reasons attribute?

If so, what else can a backend report? Is this documented somewhere?

TIA,
Erik