Raspberry Pi USB keyboard emulator

usb_keyboard.py

import time
import RPi.GPIO as GPIO

# We are going to use the BCM numbering
GPIO.setmode(GPIO.BCM)

# Set pin 26 as input using pull up resistor
GPIO.setup(26, GPIO.IN, pull_up_down=GPIO.PUD_UP)


# function to send the data
def write_report(report):
    with open('/dev/hidg0', 'rb+') as fd:
        fd.write(report.encode())

# infinite loop to check the pins and send data
while True:
    if not(GPIO.input(26)):

        # shift-cmd-5
        shift_cmd_5 = str(0b01010000) + "\0\x22\0\0\0\0\0"
        write_report(shift_cmd_5)
        print("SNAP!!")
        time.sleep(0.2)
        write_report("\0\0\0\0\0\0\0\0")

Anyone know what the scancode sequence is for ctrl+alt+del?
I tried modifier 0b10100000 (160\x0\x4c\x0\x0\x0\x0\x0) but that didn't work.

NM figured it out. The LSB is on the right so the modifier would be 5
ctrl+alt+del == "5\x0\x4c\x0\x0\x0\x0\x0"

echo -ne "5\x0\x4c\x0\x0\x0\x0\x0" > /dev/hidg0 ;echo -ne "\x0\x0\x0\x0\x0\x0\x0\x0" > /dev/hidg0

How would you do Windows+R (Run)? I can't seem to figure it out.

str(0b00010000) + "\0\x15\0\0\0\0" does not seem to work.