Raspberry Pi Pico W Wi-Fi Web Server to Control an LED and Read Data

# main.py - Pico W web server: LED control, temperature and JSON API
import network
import socket
import time
import rp2
from machine import Pin, ADC
import secrets

rp2.country('IN')                    # regulatory domain for the radio
led = Pin('LED', Pin.OUT)
temp_adc = ADC(4)

def chip_temp():
    v = temp_adc.read_u16() * 3.3 / 65535
    return 27 - (v - 0.706) / 0.001721

def connect_wifi(timeout_s=20):
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(secrets.SSID, secrets.PASSWORD)
    start = time.time()
    while not wlan.isconnected():
        if wlan.status() < 0:              # negative status = failure
            raise RuntimeError('Wi-Fi failed, status {}'.format(wlan.status()))
        if time.time() - start > timeout_s:
            raise RuntimeError('Wi-Fi timeout')
        led.toggle()                       # blink while connecting
        time.sleep(0.5)
    led.off()
    ip = wlan.ifconfig()[0]
    print('Connected, open http://{}/'.format(ip))
    return wlan

PAGE = """<!DOCTYPE html>
<html><head><meta name="viewport" content="width=device-width">
<title>Pico W</title></head>
<body style="font-family:sans-serif;text-align:center">
<h2>Pico W Control</h2>
<p>LED is <b>{state}</b></p>
<p><a href="/on"><button>ON</button></a>
<a href="/off"><button>OFF</button></a></p>
<p>Chip temperature: {temp:.1f} C</p>
</body></html>"""

def handle(path):
    # Returns (status line, content type, body) for a request path
    if path == '/on':
        led.on()
    elif path == '/off':
        led.off()
    elif path == '/api':
        body = '{{"led": {}, "temp_c": {:.1f}}}'.format(led.value(), chip_temp())
        return '200 OK', 'application/json', body
    elif path not in ('/', '/favicon.ico'):
        return '404 Not Found', 'text/plain', 'Not found'
    state = 'ON' if led.value() else 'OFF'
    return '200 OK', 'text/html', PAGE.format(state=state, temp=chip_temp())

wlan = connect_wifi()
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
server = socket.socket()
server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
server.bind(addr)
server.listen(2)

while True:
    client, remote = server.accept()
    try:
        client.settimeout(5)
        request = client.recv(1024).decode()
        # First line looks like: GET /on HTTP/1.1
        parts = request.split(' ')
        path = parts[1] if len(parts) > 1 else '/'
        status, ctype, body = handle(path)
        client.send('HTTP/1.0 {}\r\nContent-Type: {}\r\nConnection: close\r\n\r\n'.format(status, ctype))
        client.send(body)
        print(remote[0], path, status)
    except OSError as e:
        print('Client error:', e)
    finally:
        client.close()