async def METHOD_NAME():
    # Return a bytes object with the latest sensor data to send to the receiver.
    #
    # As this is just an example, we send a dummy payload which is just a string
    # containing our ticks_ms() timestamp.
    #
    # In a real application the sensor data should usually be binary data and
    # not a string, to save transmission size.
    return f"Hello, ticks_ms={time.ticks_ms()}".encode()