paho-mqtt library usage in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the MQTT client from the paho-mqtt library.

Raspberry Pi

from paho.mqtt.client import [1]

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

Amqtt_client

Bmqtt

CClient

Dclient

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase 'client' instead of 'Client'.

Trying to import 'mqtt_client' which does not exist.

The correct import is Client with a capital C from paho.mqtt.client.

2fill in blank

medium

Complete the code to create a new MQTT client instance named 'client'.

Raspberry Pi

client = [1]()

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AClient

Bmqtt.Client

Cmqtt_client.Client

DClient()

Attempts:

3 left

💡 Hint

Common Mistakes

Using mqtt.Client without importing mqtt.

Calling Client() twice.

You create a client by calling Client() after importing it.

3fill in blank

hard

Fix the error in the code to connect the client to the broker at 'localhost' on port 1883.

Raspberry Pi

client.[1]('localhost', 1883)

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

Astart

Bconnect

CconnectBroker

Dconnect_to

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like connect_to or connectBroker.

Forgetting to call the method.

The correct method to connect is connect.

4fill in blank

hard

Fill both blanks to subscribe the client to the topic 'home/temperature' with QoS level 1.

Raspberry Pi

client.[1]('home/temperature', [2])

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

Asubscribe

Bpublish

C1

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using publish instead of subscribe.

Setting QoS to 0 instead of 1.

You subscribe with subscribe and set QoS to 1.

5fill in blank

hard

Fill all three blanks to publish the message '23' to topic 'home/temperature' with QoS 0 and retain flag False.

Raspberry Pi

client.[1]('home/temperature', [2], qos=[3], retain=False)

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

Asubscribe

B'23'

C0

Dpublish

Attempts:

3 left

💡 Hint

Common Mistakes

Using subscribe instead of publish.

Passing message as a number instead of string.

Setting QoS to 1 or 2 instead of 0.

Use publish to send a message. The message is '23' as a string, QoS is 0.