You’re assuming the USB read and writes block, but they are in fact async and work quite well for this purpose. My app is document-based so the user may have m

You’re assuming the USB read and writes block, but they are in fact async and work quite well for this purpose. My app is document-based so the user may have multiple label designs open. Because of this, USB is handled from a central location. That could be another renderer, but then you have to shuttle data from renderer to renderer (via main) which in and of itself becomes laborious.