Devices which make coffee and othersuch caffeinated drinks. It's “difficult” to determine what pairings are common for these, but a general assumption of “Linux+ARM” is almost certainly applicable here, as with many other “smart” appliances and home devices.

The easiest way is to hack the existing frontpanel via overriding its pushbuttons

A similar device to this one was “hacked”, in order to function over the internet to HTTP requests. Maybe something more could come of this?

https://misteu.github.io/RPiCoffee

Run it on a Spark Photon

Although this isn’t an operating system, it may be an EOP vector, as this thing has an electronic-based interface available.

https://github.com/Q42/coffeehack

https://hackaday.com/2016/01/28/hacking-a-coffee-machine/

https://hackaday.com/2019/04/26/make-that-special-cup-of-coffee-by-completely-tweaking-the-coffee-machine/

An external board connected to Coffee Machine

This is not for this exact model, but it is for others of the same brand. May work on this.

https://github.com/OpHaCo/smart_coffee_machine