How to output text to inactive console?

Question

linux

There is a raspberry pi with a TFT display and HDMI (or a normal computer with two video cards).
I would like to display something in text mode on a small screen, while working in the console or X-x on a "large" monitor.
The problem is that when you switch a terminal to a neighboring one, be it text or X, the output on the neighboring one is frozen until it returns to it.
For example, I want to do this:
.. /dev/fb1 - TFT LCD
$ con2fbmap 2 1
$ echo "test" >/dev/tty2
if you now switch to tty2 (by hand or chvt 2), then "test" will appear on the LCD, But it needs to be updated automatically.

Answer 1

And the session was not initialized in this console, who should display that?

Answer 2

Well, why wasn't it. For example, I logged in there before switching back to the first console (or is it something else?). In addition, if you say "wall bla-bla", then this will also appear in such a console only after switching to it (even if agetty is waiting for login there)
I'm looking for a solution with all the "ifs" - how can I have a text log on one video card and at the same time "work" on another. The gurus were saying that "yes, it was true for me, for a long time, but now there is no time to try ..."