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Web Server with MicroPython

This program turns your Pico W into a small web server. The web page has two links on it. One link will turn the on-board LED on and the other link will turn the LED off.

Screen image of Pico W Web Server: 

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# Code taken from https://www.cnx-software.com/2022/07/03/getting-started-with-wifi-on-raspberry-pi-pico-w-board/
import network
import socket
import time
import secrets

from machine import Pin

# Select the onboard LED
led = machine.Pin("LED", machine.Pin.OUT)

wlan = network.WLAN(network.STA_IF)
wlan.active(True)
wlan.connect(secrets.SSID, secrets.PASSWORD)
stateis = "LED is OFF"

html = """<!DOCTYPE html>
<html>
   <head>
     <title>Web Server On Pico W </title>
   </head>
  <body>
      <h1>Pico Wireless Web Server</h1>
      <p>%s</p>
      <a href="/light/on">Turn On</a>
      <a href="/light/off">Turn Off</a>
  </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('We are connected to WiFI access point:', secrets.SSID)
  status = wlan.ifconfig()
  print( 'The IP address of the pico W is:', status[0] )

# Open socket
addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
print('addr:', addr)
s = socket.socket()
#if not addr:
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"
    # generate the we page with the stateis as a parameter
    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')

References