Subscribing to control commands in IOT Protocols - Mini Project: Build & Apply

Subscribing to Control Commands

📖 Scenario: You are working on a smart home device that needs to listen for control commands sent from a central server. These commands tell the device to turn on or off lights, adjust temperature, or perform other actions.

🎯 Goal: Build a simple program that subscribes to a control command topic and processes incoming messages.

📋 What You'll Learn

Create a variable called topic with the exact value "home/device/control"

Create a variable called client_id with the exact value "device123"

Write a function called subscribe_to_topic that takes topic and client_id as parameters

Inside the function, print a message showing subscription to the topic with the client ID

Call the function with the variables topic and client_id

Print the message "Waiting for control commands..." after subscribing

💡 Why This Matters

🌍 Real World

Smart home devices and IoT gadgets often subscribe to control commands to perform actions remotely.

💼 Career

Understanding how to subscribe and listen for control commands is essential for IoT developers and DevOps engineers managing connected devices.

1

Create subscription variables

Create a variable called topic and set it to the string "home/device/control". Also create a variable called client_id and set it to the string "device123".

IOT Protocols

# Your code here

Need a hint?

Use simple assignment to create the variables with the exact string values.

2

Define subscription function

Write a function called subscribe_to_topic that takes two parameters: topic and client_id. Inside the function, print the message "Subscribed to {topic} with client ID {client_id}" using an f-string.

IOT Protocols

topic = "home/device/control"
client_id = "device123"

# Your code here

Need a hint?

Define the function with the exact name and parameters. Use an f-string to format the print message.

3

Call subscription function

Call the function subscribe_to_topic with the variables topic and client_id as arguments.

IOT Protocols

topic = "home/device/control"
client_id = "device123"

def subscribe_to_topic(topic, client_id):
    print(f"Subscribed to {topic} with client ID {client_id}")

# Your code here

Need a hint?

Call the function with the exact variable names as arguments.

4

Print waiting message

After calling subscribe_to_topic, write a print statement that outputs exactly "Waiting for control commands...".

IOT Protocols

topic = "home/device/control"
client_id = "device123"

def subscribe_to_topic(topic, client_id):
    print(f"Subscribed to {topic} with client ID {client_id}")

subscribe_to_topic(topic, client_id)

# Your code here

Need a hint?

Use a print statement with the exact text after the function call.