Why MQTT is the IoT standard in Raspberry Pi - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the MQTT client library.

Raspberry Pi

import [1]

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

Apaho.client

Bmqtt.client

Cpaho.mqtt.client

Dmqtt

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mqtt.client' which does not exist.

Importing just 'mqtt' without the full path.

The correct library to import for MQTT in Python is paho.mqtt.client, which provides the MQTT client functionality.

2fill in blank

medium

Complete the code to create an MQTT client instance named 'client'.

Raspberry Pi

client = [1]()

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

Apaho.mqtt.client.Client

Bpaho.Client

Cpaho.mqtt.Client

Dmqtt.Client

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mqtt.Client' which is incomplete.

Using 'paho.Client' which is incorrect.

The MQTT client instance is created by calling paho.mqtt.client.Client().

3fill in blank

hard

Fix the error in the code to connect the client to the MQTT broker at 'broker.hivemq.com' on port 1883.

Raspberry Pi

client.connect([1], 1883)

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

Abroker.hivemq.com

B'mqtt.eclipse.org'

C'localhost'

D'broker.hivemq.com'

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the broker address without quotes causing a NameError.

Using a wrong broker address.

The broker address must be a string, so it needs quotes: 'broker.hivemq.com'.

4fill in blank

hard

Fill both blanks to publish the message 'Hello IoT' to the topic 'home/temperature'.

Raspberry Pi

client.publish([1], [2])

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

A'home/temperature'

B'Hello IoT'

C'home/humidity'

D'IoT message'

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping topic and message arguments.

Using wrong topic or message strings.

The first argument is the topic string 'home/temperature', and the second is the message 'Hello IoT'.

5fill in blank

hard

Fill all three blanks to subscribe to the topic 'home/lights' and start the network loop.

Raspberry Pi

client.[1]('[2]')
client.[3]()

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

Asubscribe

Bon_message

Cloop_start

Dhome/lights

Attempts:

3 left

💡 Hint

Common Mistakes

Using connect instead of subscribe.

Not starting the network loop causing no messages received.

Use subscribe to listen to a topic, the topic string is 'home/lights', and loop_start() runs the network loop in the background.