Publishing sensor data in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to publish sensor data to the MQTT broker.

IOT Protocols

client.[1]("sensor/temperature", "22.5")

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Apublish

Bconnect

Csubscribe

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using subscribe instead of publish

Trying to connect instead of sending data

The publish method sends data to a topic on the MQTT broker.

2fill in blank

medium

Complete the code to connect the client to the MQTT broker at 'broker.hivemq.com'.

IOT Protocols

client.[1]("broker.hivemq.com", 1883, 60)

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Apublish

Bsubscribe

Cconnect

Ddisconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using publish instead of connect

Trying to disconnect before connecting

The connect method establishes a connection to the MQTT broker.

3fill in blank

hard

Fix the error in the code to publish JSON sensor data correctly.

IOT Protocols

client.publish("sensor/humidity", [1])

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Ajson.load({'humidity': 45})

B{'humidity': 45}

C45

Djson.dumps({'humidity': 45})

Attempts:

3 left

💡 Hint

Common Mistakes

Publishing a dictionary directly

Using json.load instead of json.dumps

The data must be converted to a JSON string using json.dumps() before publishing.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that publishes sensor readings above 30.

IOT Protocols

filtered_data = {sensor: value[1] for sensor, value in readings.items() if value [2] 30}

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A**2

B>

C<

D*2

Attempts:

3 left

💡 Hint

Common Mistakes

Using exponentiation instead of multiplication

Filtering values less than 30

The comprehension multiplies values by 2 and filters those greater than 30.

5fill in blank

hard

Fill all three blanks to create a dictionary of sensor names in uppercase with values above 50.

IOT Protocols

result = [1]: [2] for [3], [2] in data.items() if [2] > 50

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Asensor.upper()

Bvalue

Csensor

Ddata

Attempts:

3 left

💡 Hint

Common Mistakes

Using data as iteration variable

Using sensor instead of sensor.upper() for keys

The keys are sensor names in uppercase, values are sensor readings, iterating over sensor and value.