I have putty on my Linux laptop. I’m assuming it’s a serial over USB connection at 9600 baud?
An RPI connected to the DC board makes sense.
I would have hoped instead of trying to lock this thing down, they tried to open it up more. I would have had SSH and VNC running on the DC-Skylark. You always need a solid backdoor. There’s not that much that needs to be secured.
But, I guess they did not think the project could be monetized by hobbyists. Most of the people buying the DC are hobbyists and not people without Internet. I would suspect many, many are hams who are not allowed by their HOAs to put up anything but a satellite dish.