JSON payload formatting in IOT Protocols - Mini Project: Build & Apply

JSON Payload Formatting for IoT Devices

📖 Scenario: You are working with IoT devices that send sensor data to a cloud server. The data must be formatted as a JSON payload before sending.

🎯 Goal: Build a correctly formatted JSON payload containing sensor readings and device information.

📋 What You'll Learn

Create a dictionary with device and sensor data

Add a configuration variable for temperature unit

Format the sensor data into a JSON payload string

Print the final JSON payload

💡 Why This Matters

🌍 Real World

IoT devices send sensor data as JSON payloads to cloud servers for monitoring and analysis.

💼 Career

Understanding JSON formatting is essential for DevOps engineers working with IoT data pipelines and cloud integrations.

1

Create the initial sensor data dictionary

Create a dictionary called sensor_data with these exact entries: "device_id": "sensor_001", "temperature": 22.5, "humidity": 45

IOT Protocols

# Create the sensor_data dictionary with device_id, temperature, and humidity
# Your code here

Need a hint?

Use curly braces to create a dictionary with keys and values exactly as shown.

2

Add a temperature unit configuration

Create a variable called temp_unit and set it to the string "Celsius"

IOT Protocols

sensor_data = {"device_id": "sensor_001", "temperature": 22.5, "humidity": 45}
# Create the temp_unit variable and set it to "Celsius"
# Your code here

Need a hint?

Assign the string "Celsius" to the variable temp_unit.

3

Format the JSON payload string

Import the json module and create a variable called json_payload that converts sensor_data to a JSON string using json.dumps(). Then add the temp_unit to the dictionary before conversion.

IOT Protocols

sensor_data = {"device_id": "sensor_001", "temperature": 22.5, "humidity": 45}
temp_unit = "Celsius"
# Import json module and add temp_unit to sensor_data, then convert to json_payload string
# Your code here

Need a hint?

Use import json at the top. Add the temp_unit key to sensor_data, then use json.dumps(sensor_data) to create the JSON string.

4

Print the JSON payload

Write a print() statement to display the json_payload variable

IOT Protocols

import json
sensor_data = {"device_id": "sensor_001", "temperature": 22.5, "humidity": 45}
temp_unit = "Celsius"
sensor_data["temp_unit"] = temp_unit
json_payload = json.dumps(sensor_data)
# Print the json_payload string
# Your code here

Need a hint?

Use print(json_payload) to display the JSON string.