UDP sender and receiver in CircuitPython

udp_recv_code.py

# udp_recv_code.py -- receive UDP messages from any receiver, can be another CircuitPython device
# 24 Aug 2022 - @todbot / Tod Kurt
# cribbing from code at https://github.com/adafruit/circuitpython/blob/main/tests/circuitpython-manual/socketpool/datagram/ntp.py

import time, wifi, socketpool
from secrets import secrets
print("Connecting to WiFi...")
wifi.radio.connect(ssid=secrets['ssid'],password=secrets['password'])
print("my IP addr:", wifi.radio.ipv4_address)
pool = socketpool.SocketPool(wifi.radio)

udp_host = str(wifi.radio.ipv4_address) # my LAN IP as a string
udp_port = 5005             # a number of your choosing, should be 1024-65000
udp_buffer = bytearray(64)  # stores our incoming packet

sock = pool.socket(pool.AF_INET, pool.SOCK_DGRAM) # UDP socket
sock.bind((udp_host, udp_port))  # say we want to listen on this host,port

print("waiting for packets on",udp_host, udp_port)
while True:
    size, addr = sock.recvfrom_into(udp_buffer)
    msg = udp_buffer.decode('utf-8')  # assume a string, so convert from bytearray
    print(f"Received message from {addr[0]}:", msg)

udp_send_code.py

# udp_send_code.py -- send UDP messages to specified receiver, can be another CircuitPython device
# 24 Aug 2022 - @todbot / Tod Kurt
# cribbing from code at https://github.com/adafruit/circuitpython/blob/main/tests/circuitpython-manual/socketpool/datagram/ntp.py

import time, wifi, socketpool
from secrets import secrets
print("Connecting to WiFi...")
wifi.radio.connect(ssid=secrets['ssid'],password=secrets['password'])
print("my IP addr:", wifi.radio.ipv4_address)
pool = socketpool.SocketPool(wifi.radio)

udp_host = "192.168.1.123"  # LAN IP of UDP receiver
udp_port = 5005             # must match receiver!

my_message = "hi there from CircuitPython!"

sock = pool.socket(pool.AF_INET, pool.SOCK_DGRAM) # UDP, and we'l reuse it each time

num = 0
while True:
    # stick a nubmer on the end of the message to show progress and conver to bytearray
    udp_message = bytes(f"{my_message} {num}", 'utf-8')
    num += 1
    print(f"Sending to {udp_host}:{udp_port} message:", udp_message)
    sock.sendto(udp_message, (udp_host,udp_port) )  # send UDP packet to udp_host:port
    time.sleep(1)

By the way, line 22 of udp_recv_code.py

msg = udp_buffer.decode('utf-8')

should be

msg = udp_buffer[:size].decode('utf-8')

or otherwise you might print unwanted things:)

@aceg00 thank you for your response and advice.

@todbot You should consider updating this with the above correction from @aceg00 . The current code is a real foot gun. Many thanks for this gist nonetheless though!