from machine import UART, Pin
import time

#set baudrate closest to 1000000
baudrate = 921600
uart = UART(1, baudrate=baudrate, tx=Pin(2), rx=Pin(3))

print("Sending 'Hello, World!'")
uart.write(b'Hello, World!')
while True:
    if uart.any():
        data = uart.read()
        print(data)
        uart.write(data)
    else:
        time.sleep(0.01)