Why hands-on MQTT implementation matters in IOT Protocols - See It in Action

Why Hands-on MQTT Implementation Matters

📖 Scenario: Imagine you are setting up a smart home system where devices like lights, thermostats, and sensors communicate efficiently. MQTT is a popular messaging protocol that helps these devices talk to each other quickly and reliably.To understand how MQTT works, you will create a simple program that simulates sending and receiving messages between devices.

🎯 Goal: You will build a basic MQTT message exchange simulation. This will help you see how devices publish messages and subscribe to topics to receive updates.

📋 What You'll Learn

Create a dictionary to represent MQTT topics and their messages

Add a configuration variable to set a topic filter

Use a loop to find messages matching the topic filter

Print the matched messages to simulate receiving MQTT messages

💡 Why This Matters

🌍 Real World

MQTT is widely used in smart homes, factories, and IoT devices to send small messages quickly and reliably between sensors and controllers.

💼 Career

Understanding MQTT basics helps in roles like IoT developer, DevOps engineer for IoT platforms, and system integrator working with connected devices.

1

Create MQTT topics with messages

Create a dictionary called mqtt_messages with these exact entries: 'home/livingroom/light': 'ON', 'home/kitchen/temperature': '22C', 'home/bedroom/humidity': '45%'

IOT Protocols

# Create the mqtt_messages dictionary with the specified topics and messages
# Your code here

Need a hint?

Think of mqtt_messages as a list of topics with their current messages.

2

Set the topic filter

Create a variable called topic_filter and set it to the string 'home/kitchen'

IOT Protocols

mqtt_messages = {
    'home/livingroom/light': 'ON',
    'home/kitchen/temperature': '22C',
    'home/bedroom/humidity': '45%'
}
# Set the topic_filter variable to 'home/kitchen'
# Your code here

Need a hint?

This filter will help us find messages related to the kitchen.

3

Find messages matching the topic filter

Use a for loop with variables topic and message to iterate over mqtt_messages.items(). Inside the loop, use an if statement to check if topic_filter is in topic. If yes, add the message to a list called filtered_messages. Initialize filtered_messages as an empty list before the loop.

IOT Protocols

mqtt_messages = {
    'home/livingroom/light': 'ON',
    'home/kitchen/temperature': '22C',
    'home/bedroom/humidity': '45%'
}
topic_filter = 'home/kitchen'

# Create filtered_messages list and add messages matching topic_filter
# Your code here

Need a hint?

Think of this as checking each message to see if it belongs to the kitchen.

4

Display the filtered MQTT messages

Write a print statement to display the filtered_messages list.

IOT Protocols

mqtt_messages = {
    'home/livingroom/light': 'ON',
    'home/kitchen/temperature': '22C',
    'home/bedroom/humidity': '45%'
}
topic_filter = 'home/kitchen'

filtered_messages = []
for topic, message in mqtt_messages.items():
    if topic_filter in topic:
        filtered_messages.append(message)

# Print the filtered_messages list
# Your code here

Need a hint?

This shows the messages your devices would receive for the kitchen topic.