Requirements for letting brltty read a text console:

Minimum:
- access to the text that is displayed, as matrices of unicode chars or vectors of lines of unicode chars, for instance (and screen size of course).
- access to the cursor position

Really useful:
- access to the attributes of the text (color, etc.)
- simulate keypresses as plain unicode/utf-8 text / ansi sequences for instance.
- simulate keypresses as AT1/AT2 scancodes.
- access to the number of the current virtual console (if there are several of them).
- simulate virtual console switch

Helpful:
- highlight a rectangular portion of the screen.
- access to the mouse position and possibility to move it, if any.
- access to the cut&paste buffer, if any.

Contact samuel.thibault@ens-lyon.org if you need more precisions.