Publishing sensor data 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] as mqtt

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Atime

Brandom

Cpaho.mqtt.client

Dos

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated libraries like random or os.

Forgetting to import the MQTT client library.

The paho.mqtt.client library is used to publish sensor data via MQTT.

2fill in blank

medium

Complete the code to connect the MQTT client to the broker at 'localhost'.

Raspberry Pi

client = mqtt.Client()
client.[1]('localhost')

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Aconnect

Bloop_start

Csubscribe

Dpublish

Attempts:

3 left

💡 Hint

Common Mistakes

Using publish instead of connect.

Calling subscribe before connecting.

The connect method connects the client to the MQTT broker.

3fill in blank

hard

Fix the error in publishing the sensor data to topic 'sensor/temperature'.

Raspberry Pi

temperature = 23.5
client.publish([1], str(temperature))

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A'temperature/sensor'

Bsensor/temperature

C'sensor.temperature'

D'sensor/temperature'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around the topic string.

Using dots instead of slashes in topic names.

The topic name must be a string, so it needs quotes around it.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps sensor names to their values if the value is above 20.

Raspberry Pi

sensor_data = {'temp': 22, 'humidity': 18, 'pressure': 25}
filtered = {k: v for k, v in sensor_data.items() if v [1] 20 and k [2] 'humidity'}

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A>

B!=

C<

D==

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' for value comparison.

Using '==' instead of '!=' to exclude 'humidity'.

The comprehension filters values greater than 20 and excludes 'humidity'.

5fill in blank

hard

Fill all three blanks to create a loop that publishes each sensor's data as a string to the topic 'sensor/{sensor_name}'.

Raspberry Pi

for [1], [2] in sensor_data.items():
    topic = f'sensor/[3]'
    client.publish(topic, str([2]))

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Asensor

Bvalue

Dkey

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for both key and value.

Not using the sensor name in the topic string.

The loop uses key and value to iterate, and the topic uses the sensor name (key).