CircuitPython "keyboard" to type in a public key into the Raspberry Pi network installer

code.py

'''CircuitPython script that simulates a USB keyboard. It waits 5 seconds, and then
types in the contents of the string `public_key`. I wanted a way to easily enter
my SSH public key without manually typing it into the Raspberry Pi network installer.

Requires `adafruit_hid` from the Adafruit CircuitPython Bundle:
https://github.com/adafruit/Adafruit_CircuitPython_Bundle/releases

For a Raspberry Pi Pico running CircuitPython, I used
https://github.com/adafruit/Adafruit_CircuitPython_Bundle/releases/download/20220216/adafruit-circuitpython-bundle-7.x-mpy-20220216.zip

To install the adafruit_hid package, extract the zip, and then
copy the `adafruit_hid` directory from the unzipped lib/ into your Pi Pico's lib/ directory.
'''

public_key = '''WHAT YOU WANT TO TYPE GOES HERE. E.g. the contents of your PUBLIC ssh key'''
# public_key = '''ssh-ed25519 AJUMBLEOFLETTERSANDNUMBERS... username@host'''

import time
import usb_hid
from adafruit_hid.keyboard import Keyboard
from adafruit_hid.keyboard_layout_us import KeyboardLayoutUS

kbd = Keyboard(usb_hid.devices)
kbdl = KeyboardLayoutUS(kbd)

time.sleep(5.0) # Wait 5.0 seconds for everything to get ready

for letter in public_key:
    kbd.send(*kbdl.keycodes(letter))
    time.sleep(0.01)