MQTT-SN for sensor networks in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the MQTT-SN client ID.

IOT Protocols

client.setClientId("[1]")

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AsensorNode01

Bconnect

Cpublish

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using MQTT actions like 'connect' or 'publish' as client ID.

The client ID uniquely identifies the MQTT-SN client in the network.

2fill in blank

medium

Complete the code to connect the MQTT-SN client to the gateway.

IOT Protocols

client.[1]()

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Aconnect

Bpublish

Cdisconnect

Dsubscribe

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'disconnect' or 'publish' instead of 'connect' here.

The 'connect' method establishes a connection between the client and the MQTT-SN gateway.

3fill in blank

hard

Fix the error in the publish command to send sensor data.

IOT Protocols

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

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Adisconnect

Bconnect

Csubscribe

Dtemperature

Attempts:

3 left

💡 Hint

Common Mistakes

Using method names like 'connect' or 'subscribe' as data payload.

The publish method requires the data payload, here the variable 'temperature' holds the sensor reading.

4fill in blank

hard

Fill both blanks to subscribe to a topic and set the callback function.

IOT Protocols

client.[1]("sensor/alerts")
client.[2] = alertHandler

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Asubscribe

Bpublish

ConMessage

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'publish' instead of 'subscribe' or wrong handler property.

Subscribe listens to a topic, and onMessage sets the function to handle incoming messages.

5fill in blank

hard

Fill all three blanks to create a dictionary of sensor readings filtered by value.

IOT Protocols

filtered = [1]: [2] for [3] in readings if readings[[3]] > 50}

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Asensor

Breadings[sensor]

Dvalue

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names or values in comprehension.

This dictionary comprehension creates a new dict with sensors and their readings above 50.