CircuitPython mDNS finder for ESP32-S2/S3

mdns_finder.py

import time
import wifi
import ipaddress
import socketpool
import mdns
from secrets import secrets

MDNSFINDTIMEOUT = 5

pool = socketpool.SocketPool(wifi.radio)

def connect():
    # to connect in case CP8 web workflow hasn't already, or to reconnect if disconnexted
    if not wifi.radio.ipv4_address:
        print (f"Connecting to wifi AP ... ", end="")
        wifi.radio.connect(secrets["ssid"], secrets["password"])
        print (f"{wifi.radio.ipv4_address}")

print(f"Starting mDNS server ...\n")
m = mdns.Server(wifi.radio)

while True:
    connect()
    print(f"Finding mDNS hosts from {wifi.radio.ipv4_address} ...\n")

    try:
        host = "circuitpython.local"
        print(f"{host}")
        # ESP mDNS TTL seems to be 2 minutes
        # no difference in result with wrong port
        print(f"{ipaddress.ip_address(pool.getaddrinfo(host, 80)[0][4][0])}")
        print()
    except OSError as e:
        print(f"OSError: {e}")  # OSError: -2

    for service in m.find(service_type="_circuitpython", protocol="_tcp", timeout=MDNSFINDTIMEOUT):
        print(f"{service.service_type} {service.protocol}")
        print(f"{service.instance_name}")
        localname = ".".join((service.hostname, "local"))
        print(f"{localname}:{service.port}")
        print(f"{service.ipv4_address}:{service.port}")
        print()
    time.sleep(15)