Device Simulator
The Device Simulator makes the firmware's setup and /display calls from your browser, so you can poll as any Device without hardware. It lives on the Instance pages.
Its calls are real. A setup call with an unknown MAC registers a new Device, and a poll advances that Device's Rotation, overwrites what it last reported and consumes a pending Special Function, Device Reset or Firmware push. That makes it the quickest way to see how your Screens render and rotate, or to troubleshoot a Device that is behaving oddly.
The live demo is a good place to try it: the demo resets once a day.