Topic design patterns for IoT in IOT Protocols - Mini Project: Build & Apply

Designing MQTT Topic Patterns for IoT Devices

📖 Scenario: You are working with a smart home system that uses MQTT to communicate between devices and a central server. To organize messages clearly, you need to create a topic structure that helps devices publish and subscribe to the right information.Think of MQTT topics like folders in a filing cabinet. Each device and message type has its own place so everyone knows where to look.

🎯 Goal: Build a simple MQTT topic pattern dictionary that maps device types to their topic paths. Then, add a configuration for a location prefix. Finally, create full topic paths by combining the location and device topics, and print the result.

📋 What You'll Learn

Create a dictionary called device_topics with exact keys and values for device types and their MQTT topic suffixes.

Add a string variable called location_prefix with the exact value home/livingroom.

Use a dictionary comprehension to create a new dictionary called full_topics that combines location_prefix and each topic suffix from device_topics.

Print the full_topics dictionary exactly as shown.

💡 Why This Matters

🌍 Real World

MQTT topic design is essential for organizing messages in IoT systems, making it easier to manage devices and data flow.

💼 Career

Understanding topic patterns helps DevOps engineers and IoT developers set up scalable and maintainable communication between devices and servers.

1

Create the MQTT topic suffix dictionary

Create a dictionary called device_topics with these exact entries: 'temperature_sensor': 'sensor/temperature', 'humidity_sensor': 'sensor/humidity', 'light_switch': 'actuator/light'.

IOT Protocols

# Create the device_topics dictionary with exact keys and values
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Each key and value should be a string exactly as shown.

2

Add the location prefix variable

Add a string variable called location_prefix and set it to 'home/livingroom'.

IOT Protocols

device_topics = {
    'temperature_sensor': 'sensor/temperature',
    'humidity_sensor': 'sensor/humidity',
    'light_switch': 'actuator/light'
}
# Add the location_prefix variable below
# Your code here

Need a hint?

Use a simple assignment to create the variable with the exact string value.

3

Create full MQTT topic paths

Use a dictionary comprehension to create a new dictionary called full_topics that combines location_prefix and each topic suffix from device_topics separated by a slash /. Use for device, topic in device_topics.items() in the comprehension.

IOT Protocols

device_topics = {
    'temperature_sensor': 'sensor/temperature',
    'humidity_sensor': 'sensor/humidity',
    'light_switch': 'actuator/light'
}

location_prefix = 'home/livingroom'
# Create full_topics dictionary using dictionary comprehension
# Your code here

Need a hint?

Use an f-string inside the comprehension to join location_prefix and topic with a slash.

4

Print the full topic dictionary

Write a print statement to display the full_topics dictionary exactly as it is.

IOT Protocols

device_topics = {
    'temperature_sensor': 'sensor/temperature',
    'humidity_sensor': 'sensor/humidity',
    'light_switch': 'actuator/light'
}

location_prefix = 'home/livingroom'

full_topics = {device: f"{location_prefix}/{topic}" for device, topic in device_topics.items()}
# Print the full_topics dictionary
# Your code here

Need a hint?

Use print(full_topics) to show the dictionary.