A few months ago I wrote about Microsoft Teams running on a coffee machine. That was a fun work experiment where I got a VNC client running on the linux-based coffee machines that we produce at work. In the comments on hackernews Jean-Michaël Celerier pointed me to the reverse, a way to expose any Qt application over VNC. This article shows you how I use this feature to work on our Qt 5 based coffee machine frontend as well as how you can use this on your machine, for example, to expose Dolphin, the KDE file manager, over VNC.
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Our Qt frontend for the coffee machines can run as a local application just fine, it's nothing more than a client towards an HTTP API. One other such client is our touchless feature, that exposes a part of the machine over MQtT to a website.