serial_com.py

import radio
import random
from microbit import display, Image, button_a, sleep, uart

flash = [Image().invert()*(i/9) for i in range(9, -1, -1)]

radio.on()    
uart.init(115200)

def get_serial_number(type=hex):
    NRF_FICR_BASE = 0x10000000
    DEVICEID_INDEX = 25 # deviceid[1]

    @micropython.asm_thumb
    def reg_read(r0):
        ldr(r0, [r0, 0])
    return type(reg_read(NRF_FICR_BASE + (DEVICEID_INDEX*4)))

serial_num = get_serial_number()

while True:
    # incoming = "54:11:1234:number:321"
    # incoming = "hello>4:11:" + serial_num + ":keyvalue:321"
    
    incoming = radio.receive()
    
    if incoming != None:
        
        display.show(flash, delay=100, wait=False)
    
        print(str(incoming))
        sleep(1000)
    else :
        display.show(Image.SAD)
        
    # msg = uart.read()
    #msg_str = str(msg_bytes, 'UTF-8')
    # test = sys.stdn.read()
    
    if uart.any():
        display.show(flash, delay=100, wait=False)
        
        sleep(1000)
    else:
        display.show(Image.SAD)