Design a Smart Home System

Functional Requirements:

• Device Management: Users can add, remove, and control smart devices (e.g., lights, thermostats, cameras, locks) in their home.
• Remote Access: Users can monitor and control devices from a mobile app or web interface, both locally and remotely.
• Automation & Scheduling: Users can set up automation rules or schedules (e.g., turn on lights at sunset).
• Notifications: The system sends alerts for important events (e.g., motion detected, door unlocked, device offline).
• User Management: Support multiple users per home, with basic roles (e.g., owner, guest).

Non-Functional Requirements:

• Security: All communication and data storage must be encrypted; only authorized users can access or control devices.
• Reliability: The system should be highly available and handle device or network failures gracefully.
• Scalability: Support up to a few hundred devices per home and thousands of concurrent users across the platform.
• Performance: Device control actions and status updates should complete within 2 seconds.
• Interoperability: Support common device protocols (e.g., Wi-Fi, Zigbee) via a pluggable architecture.