httpserver.py

# Rui Santos & Sara Santos - Random Nerd Tutorials
# Complete project details at https://RandomNerdTutorials.com/raspberry-pi-pico-w-asynchronous-web-server-micropython/

# Import necessary modules
import network
import asyncio
import socket
import time
import random
from servolib import Servo

# Wi-Fi credentials
ssid = 'jhcgn'
password = 'ZirkusRatte'

# Create servo
servo = Servo(pin=0)

# HTML template for the webpage
def webpage():
    html = f"""
        <!DOCTYPE html>
        <html>
        <head>
            <title>Pico Web Server</title>
            <meta name="viewport" content="width=device-width, initial-scale=1">
        </head>
        <body>
            <h1>Raspberry Pi Pico Web Server</h1>
            <h2>Servo control</h2>
            <form action="./servo0">
                <input type="submit" value="servo 0" />
            </form>
            <br>
            <form action="./servo180">
                <input type="submit" value="servo 180" />
            </form>
        </body>
        </html>
        """
    return str(html)

# Init Wi-Fi Interface
def init_wifi(ssid, password):
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    # Connect to your network
    wlan.connect(ssid, password)
    # Wait for Wi-Fi connection
    connection_timeout = 10
    while connection_timeout > 0:
        print(wlan.status())
        if wlan.status() >= 3:
            break
        connection_timeout -= 1
        print('Waiting for Wi-Fi connection...')
        time.sleep(1)
    # Check if connection is successful
    if wlan.status() != 3:
        print('Failed to connect to Wi-Fi')
        return False
    else:
        print('Connection successful!')
        network_info = wlan.ifconfig()
        for ip in network_info:
            print('IP address:', ip)
        return True

# Asynchronous functio to handle client's requests
async def handle_client(reader, writer):
    global state
    
    print("Client connected")
    request_line = await reader.readline()
    print('Request:', request_line)
    
    # Skip HTTP request headers
    while await reader.readline() != b"\r\n":
        pass
    
    request = str(request_line, 'utf-8').split()[1]
    print('Request:', request)
    
    # Process the request and update variables
    if request == '/servo0?':
        servo.move(0)
    elif request == '/servo180?':
        servo.move(180)
    elif request == '/':
        response = webpage()

    # Generate HTML response
    # response = webpage(random_value, state)

    # Send the HTTP response and close the connection
    writer.write('HTTP/1.0 200 OK\r\nContent-type: text/html\r\n\r\n')
    writer.write(response)
    await writer.drain()
    await writer.wait_closed()
    print('Client Disconnected')

async def main():    
    if not init_wifi(ssid, password):
        print('Exiting program.')
        return
    
    # Start the server and run the event loop
    print('Setting up server')
    server = asyncio.start_server(handle_client, "0.0.0.0", 80)
    asyncio.create_task(server)
    
    while True:
        # Add other tasks that you might need to do in the loop
        await asyncio.sleep(5)
        print('This message will be printed every 5 seconds')
        

# Create an Event Loop
loop = asyncio.get_event_loop()
# Create a task to run the main function
loop.create_task(main())

try:
    # Run the event loop indefinitely
    loop.run_forever()
except Exception as e:
    print('Error occured: ', e)
except KeyboardInterrupt:
    print('Program Interrupted by the user')