thanks for the tips! I'll definitely check those out.
the rpi is headless and the idea is that I want to use the 400's integrated keyboard to type but use the e-ink reader as a display. to do that, I use the e-ink reader to ssh into a headless rpi (either the 4 with a usb keeb or the 400 with its integrated keeb). I like to use usb-tethered networking so I don't have to rely on a middleman (though it is useful to keep it as an option to save work to the cloud on the go).
once connected, it is also possible to type into the rpi with the display's touchscreen, but that's no fun. I prefer to use a custom mechanical keyboard or the 400's integrated chiclets. I could just use a GUI raspian but I'd need an e-ink display that can handle doing a whole desktop, but to use my glowlight plus I just need to ssh into the rpi and run screen.
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