RetroPrinter Support

I've put the retro printer aside for a bit while I tested a different approach.

One thing that popped up during testing was to get a successful print, things needed to be powered up in a specific order.
If powered up out of sequence, the pi would not print the data sent from my controller, but oddly would still print a test page from the web gui.

I don't know if this is due to my needs for passthrough or if this can be seen with other methods.

I guess the issue is more to do with whether the controller recognises that a device is connected at all if the raspberry pi is not powered at the time you turn the controller on.

If the issue is that you need to turn the printer on before the retro-primter then yes, this may be something we need to change in the software for the USB passthrough. The question is what the software should do if it cannot open the USB printer port - does it wait and not acknowledge data from the controller or does it need to spool the data until a printer port can be opened?

Maybe a configurable option?