Edge gateway architecture in IOT Protocols - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the main function of an edge gateway.

IOT Protocols

def [1]():
    print("Edge gateway started")

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Amain

Brun

Cgateway_init

Dstart_gateway

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-standard function names like 'start_gateway' or 'gateway_init'.

The main function is conventionally named main to indicate the program's entry point.

2fill in blank

medium

Complete the code to import the MQTT client library used in edge gateways.

IOT Protocols

import [1]

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Ahttp.client

Bpaho.mqtt.client

Csocket

Djson

Attempts:

3 left

💡 Hint

Common Mistakes

Importing unrelated libraries like 'http.client' or 'json'.

paho.mqtt.client is a popular MQTT client library used in IoT edge gateways.

3fill in blank

hard

Fix the error in the code to connect the edge gateway to the MQTT broker.

IOT Protocols

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

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Ainit

Bstart

Copen

Dconnect

Attempts:

3 left

💡 Hint

Common Mistakes

Using methods like 'start' or 'init' which do not exist for connection.

The connect method establishes a connection to the MQTT broker.

4fill in blank

hard

Fill both blanks to subscribe the edge gateway to a topic and start the network loop.

IOT Protocols

client.[1]("sensors/temperature")
client.[2]()

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Asubscribe

Bpublish

Cloop_start

Dloop_forever

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'publish' instead of 'subscribe' or 'loop_forever' which blocks execution.

The subscribe method subscribes to a topic, and loop_start starts the network loop in a separate thread.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps sensor IDs to their latest readings if the reading is above threshold.

IOT Protocols

sensor_data = [1]: [2] for [3], [2] in readings.items() if [2] > 50}

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Asensor_id

Bvalue

Creadings

Dsensor

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names or wrong loop variable names.

The comprehension maps sensor_id to value for each sensor_id, value pair in readings where the value is above 50.