Remarkable lists "Wi-Fi / USB-C / Accessory port" under "Connectivity" for the Remarkable 2, and "USB C connectivity for fast file transfer and charging" in its comparison. The device also does have the necessary hardware to be capable of acting as host, and connecting keyboards.
But of course, Remarkable don't actually state that the port is certified, and so it turns out that it doesn't behave at all in the way a normal person might expect.
File transfer is implemented, not via any usual method, but by having the device act as a network adapter, and having a web interface accessible at a fixed IP address, behind a setting that seems to reset itself to Off at various times.
While the port would support OTG, Remarkable has added a kernel module that, amongst other things, breaks the detection and switching needed for that to work automatically. You can configure it manually, in which case the port won't provide power, though a keyboard with a Y-adapter will work.
However, next to the USB-C port, there isa a set of five exposed contacts that appears designed for a magnetic attachment, and Remarkable notes that it's there to support potential future accessories. People investigating them have found that it's a USB interface. It supports OTG, will provide power, and can have a keyboard attached.
On the Remarkable 1, which doesn't have the accessory connection, and thus doesn't have the potential for future products, keyboards can apparently just be attached to the USB port.
>What are "e-ink device companies"?
Remarkable / Onyx / etc: companies that are built around e-ink devices.
