Example: debug the secondary UART

This sample code is handy for debugging the secondary UART. It simply relays data between the primary and secondary UARTs.

from machine import UART
import sys, time
 
def uart_init():
    u = UART(1)
    u.write('Testing from XBee\n')
    return u
 
def uart_relay(u):
    while True:
        uart_data = u.read(-1)
        if uart_data:
            sys.stdout.buffer.write(uart_data)
        stdin_data = sys.stdin.buffer.read(-1)
        if stdin_data:
            u.write(stdin_data)
             
        time.sleep_ms(5)
 
u = uart_init()
uart_relay(u)
        

You only need to call uart_init() once.

Call uart_relay() to pass data between the UARTs.

Send Ctrl-C to exit relay mode.

When done, call u.close() to close the secondary UART.