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from pybricks.hubs import PrimeHub
from pybricks.parameters import Color
from pybricks.tools import AppData
from ustruct import unpack

# Set up.
hub = PrimeHub()
app = AppData([(0, 4)])
app.configure(0, 0, bytes([Color.RED.h // 2]))
x = 0
y = 0
width = 0
height = 0


# The main program starts here.
while True:
    # Unpack the list of values into our variables.
    x, y, width, height = unpack('BBBB', app.get_bytes(0)) or [0] * 4
    # Display the x position on the display for easy testing.
    hub.display.number(x)