Third example

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This code was from the official manual, but it didn't work
I had to add and and initialise the variable "stateis"

Modify code at beginning from:

 led = Pin(15, Pin.OUT)

to:

led = machine.Pin("LED", machine.Pin.OUT)
 
stateis = ""

Now everything works

import network
import socket
import time
 
from machine import Pin
 
led = machine.Pin("LED", machine.Pin.OUT)
 
stateis = ""
 
ssid = 'dlink2'
password = 'bananatree'
 
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(ssid, password)
 
html = """<!DOCTYPE html>
 <html>
   <head> <title>Pico W</title> </head>
   <body> <h1>Pico W</h1>
  Switches on and off the on board LED on my Pico W
       <p>%s</p>
   </body>
 </html>
 """
 
# Wait for connect or fail
max_wait = 10
while max_wait > 0:
    if wlan.status() < 0 or wlan.status() >= 3:
        break
    max_wait -= 1
    print('waiting for connection...')
    time.sleep(1)
 
# Handle connection error
if wlan.status() != 3:
    raise RuntimeError('network connection failed')
else:
    print('connected')
    status = wlan.ifconfig()
    print( 'ip = ' + status[0] )
 
# Open socket
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
 
s = socket.socket()
s.bind(addr)
s.listen(1)
 
print('listening on', addr)
 
# Listen for connections
while True:
    try:
        cl, addr = s.accept()
        print('client connected from', addr)
        request = cl.recv(1024)
        print(request)
 
        request = str(request)
        led_on = request.find('/light/on')
        led_off = request.find('/light/off')
        print( 'led on = ' + str(led_on))
        print( 'led off = ' + str(led_off))
 
        if led_on == 6:
            print("led on")
            led.value(1)
            stateis = "LED is ON"
 
        if led_off == 6:
            print("led off")
            led.value(0)
            stateis = "LED is OFF"
        #stateis = "LED"
        response = html % stateis
 
        cl.send('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
        cl.send(response)
        cl.close()
 
    except OSError as e:
        cl.close()
        print('connection closed')