Publish-subscribe architecture in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to publish a message to a topic using MQTT.

IOT Protocols

client.publish('[1]', 'Hello World')

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Ahome/livingroom/temperature

Bconnect

Csubscribe

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names like 'connect' or 'subscribe' as the topic name.

Leaving the topic name blank or using invalid strings.

The publish method requires the topic name as the first argument. Here, home/livingroom/temperature is a valid topic.

2fill in blank

medium

Complete the code to subscribe to a topic to receive messages.

IOT Protocols

client.[1]('home/kitchen/humidity')

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Apublish

Bsubscribe

Cconnect

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using publish instead of subscribe to listen for messages.

Confusing connection methods with subscription.

The subscribe method is used to listen for messages on a topic.

3fill in blank

hard

Fix the error in the code to correctly connect to the MQTT broker.

IOT Protocols

client.[1]('mqtt.example.com', 1883)

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Aconnect

Bpublish

Csubscribe

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using publish or subscribe instead of connect to connect.

Omitting the port number or using wrong method names.

The connect method is used to establish a connection to the MQTT broker with the host and port.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps topics to their message lengths for topics with messages longer than 5 characters.

IOT Protocols

{topic: len(message) for topic, message in messages.items() if len(message) [1] [2]

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A>

B5

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using < or == instead of >.

Swapping the number and operator positions.

The condition len(message) > 5 filters messages longer than 5 characters.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps uppercase topic names to message sizes for messages with size greater than 10.

IOT Protocols

{ [1]: [2] for topic, message in data.items() if len(message) [3] 10 }

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Atopic.upper()

Blen(message)

C>

Dtopic

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original topic name instead of uppercase.

Using wrong comparison operators or values.

The comprehension maps uppercase topic names (topic.upper()) to message lengths (len(message)) for messages longer than 10 characters (> 10).