Why web servers enable remote IoT control in Raspberry Pi - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a simple web server on the Raspberry Pi.

Raspberry Pi

from http.server import HTTPServer, SimpleHTTPRequestHandler

server = HTTPServer(('0.0.0.0', [1]), SimpleHTTPRequestHandler)
server.serve_forever()

Drag options to blanks, or click blank then click option'

A443

B3306

C22

D8080

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing port 22 which is for SSH, not HTTP.

The port 8080 is commonly used for web servers on Raspberry Pi for testing and remote control.

2fill in blank

medium

Complete the code to handle a GET request and respond with a message.

Raspberry Pi

from http.server import BaseHTTPRequestHandler

class Handler(BaseHTTPRequestHandler):
    def do_GET(self):
        self.send_response(200)
        self.send_header('Content-type', 'text/plain')
        self.end_headers()
        self.wfile.write(b'[1]')

Drag options to blanks, or click blank then click option'

AHello, IoT!

BError 404

CUnauthorized

DServer busy

Attempts:

3 left

💡 Hint

Common Mistakes

Using error messages instead of a success message.

The server should respond with a friendly message like 'Hello, IoT!' to confirm it is working.

3fill in blank

hard

Fix the error in the code to correctly parse the URL path for IoT commands.

Raspberry Pi

from urllib.parse import urlparse

path = urlparse(self.path).[1]
if path == '/led/on':
    self.wfile.write(b'LED turned on')

Drag options to blanks, or click blank then click option'

Aquery

Bpath

Cparams

Dnetloc

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'query' or 'params' instead of 'path'.

The 'path' attribute of the parsed URL gives the URL path to check commands like '/led/on'.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps device names to their status if status is 'on'.

Raspberry Pi

devices = {'lamp': 'on', 'fan': 'off', 'heater': 'on'}
on_devices = { [1] : [2] for [1] in devices if devices[[1]] == 'on' }

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Adevice

Bdevices[device]

Cstatus

Ddevice_status

Attempts:

3 left

💡 Hint

Common Mistakes

Using undefined variable names or wrong dictionary keys.

The comprehension uses 'device' as the key and 'devices[device]' as the value for devices that are 'on'.

5fill in blank

hard

Fill all three blanks to create a function that turns on a device and returns a confirmation message.

Raspberry Pi

def control_device([1]):
    devices[[2]] = 'on'
    return f"[3] turned on"

Drag options to blanks, or click blank then click option'

Adevice_name

Dstatus

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names causing errors.

The function takes 'device_name' as input, sets its status to 'on', and returns a message using the same variable.