Device shadow (digital twin) in IOT Protocols - Mini Project: Build & Apply

Device Shadow (Digital Twin) Simulation

📖 Scenario: You are managing smart home devices remotely. Each device has a device shadow, a digital copy of its state stored in the cloud. This shadow helps you track and control the device even when it is offline.In this project, you will simulate a simple device shadow using a dictionary to represent the device's reported and desired states.

🎯 Goal: Build a small program that creates a device shadow dictionary, sets a desired state, updates the reported state, and finally prints the current shadow state.

📋 What You'll Learn

Create a dictionary called device_shadow with keys reported and desired, both starting as empty dictionaries.

Add a desired state for temperature set to 22 degrees.

Update the reported state with temperature set to 20 degrees.

Print the complete device_shadow dictionary to show current states.

💡 Why This Matters

🌍 Real World

Device shadows are used in IoT to keep a cloud copy of a device's state. This helps users control devices remotely and handle offline scenarios.

💼 Career

Understanding device shadows is important for IoT developers and DevOps engineers managing connected devices and cloud services.

1

Create the initial device shadow dictionary

Create a dictionary called device_shadow with two keys: reported and desired. Both should be empty dictionaries.

IOT Protocols

# Create the device_shadow dictionary with empty reported and desired states
# Your code here

Need a hint?

Think of device_shadow as a box with two smaller boxes inside: one for what the device says (reported) and one for what you want it to do (desired).

2

Set the desired temperature state

Add a key temperature with value 22 inside the desired dictionary of device_shadow.

IOT Protocols

device_shadow = {"reported": {}, "desired": {}}
# Set desired temperature to 22
# Your code here

Need a hint?

Use device_shadow["desired"]["temperature"] = 22 to set the desired temperature.

3

Update the reported temperature state

Add a key temperature with value 20 inside the reported dictionary of device_shadow.

IOT Protocols

device_shadow = {"reported": {}, "desired": {}}
device_shadow["desired"]["temperature"] = 22
# Set reported temperature to 20
# Your code here

Need a hint?

Use device_shadow["reported"]["temperature"] = 20 to update the reported temperature.

4

Print the device shadow

Print the device_shadow dictionary to display the current reported and desired states.

IOT Protocols

device_shadow = {"reported": {}, "desired": {}}
device_shadow["desired"]["temperature"] = 22
device_shadow["reported"]["temperature"] = 20
# Print the device_shadow dictionary
# Your code here

Need a hint?

Use print(device_shadow) to show the current device shadow.