Multi-device MQTT network in Raspberry Pi - Interactive Code Practice

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'

Amqtt

Bmqtt.client

Cpaho.mqtt.client

Dpaho.mqtt

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'mqtt' or 'mqtt.client' which are not valid imports.

Importing 'paho.mqtt' without '.client' which does not provide the client class.

The paho.mqtt.client module is the standard Python library for MQTT communication.

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'

Amqtt.client.Client

Bpaho.Client

Cmqtt.Client

Dpaho.mqtt.client.Client

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'mqtt.Client' which is not imported directly.

Using 'paho.Client' which is incomplete.

The MQTT client 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.[1]('broker.hivemq.com', 1883)

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

Aconnect

Bconnect_to

Cstart_connect

Dopen_connection

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-existent methods like 'connect_to' or 'start_connect'.

Trying to use 'open_connection' which is not part of the MQTT client.

The correct method to connect the client to the broker is connect().

4fill in blank

hard

Fill both blanks to subscribe the client to the topic 'home/room1/temperature' with QoS level 1.

Raspberry Pi

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

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

Asubscribe

Bpublish

Chome/room1/temperature

Dhome/room1/humidity

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'publish' instead of 'subscribe' to listen to messages.

Subscribing to the wrong topic like humidity.

Use subscribe method with the topic 'home/room1/temperature' to receive messages on that topic.

5fill in blank

hard

Fill all three blanks to publish the message '22.5' to the topic 'home/room2/humidity' with QoS 0.

Raspberry Pi

client.[1]('[2]', [3], qos=0)

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

Asubscribe

B'22.5'

Chome/room2/humidity

Dpublish

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'subscribe' instead of 'publish' to send messages.

Swapping topic and message arguments.

Use publish method with the topic 'home/room2/humidity' and message '22.5' to send data.