France accuses Iran of supermarket fridge hacking

What does raising the fridge's temperature look like for the attackers? I mean this in a couple ways.

How are they controlling so many at once? Like a list of IP's they can ssh into?

And then what form is the command taking? Some sort of linux command where they set a discrete value `fridgectl --temperature 50`

IDK not that important just find it hard to imagine what the sort of UX is here. Not a fridge-hacker-guy.

Just imagine all the embedded systems out there calmly doing their job like it's 2008 or so still. Never updating, connected to the Internet... it has to be billions of devices.