Sample test sending keys on Wayland from string to emulate typing.

type_on_wayland.py

import sys
import time

# https://pypi.org/project/evdev/
import evdev

string = 'We are typing this 1!'

with evdev.UInput() as ui:
    escape = False
    shift = False
    for letter in string:
        if letter == ' ':
            key = evdev.ecodes.KEY_SPACE
        elif letter == '\\':
            escape = True
            continue
        elif escape and letter == 'r':
            escape = False
            key = evdev.ecodes.KEY_ENTER
        elif letter == '!':
            # Symbols are the biggest problem here since we need to know which key
            # to press and if we need shift. This will change with different keyboard layouts.
            key = evdev.ecodes.ecodes['KEY_1']
            shift = True
        else:
            key = evdev.ecodes.ecodes['KEY_'+letter.upper()]

        if letter.isupper() or shift:
            ui.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_LEFTSHIFT, 1)

        ui.write(evdev.ecodes.EV_KEY, key, 1)
        ui.write(evdev.ecodes.EV_KEY, key, 0)
        time.sleep(.05)
        ui.syn()

        if letter.isupper() or shift:
            ui.write(evdev.ecodes.EV_KEY, evdev.ecodes.KEY_LEFTSHIFT, 0)
    ui.syn()

Adapted from https://github.com/meeuw/injectinput/blob/master/injectinput/injectinput.py