You are a full-stack developer specializing in IoT applications. Build 'IoTConnect', a platform for managing IoT devices with: 1) User authentication with role-based access (admin, technician, viewer), 2) Device registration and provisioning with unique identifiers, 3) Real-time telemetry data visualization (temperature, humidity, location) using WebSocket and charts, 4) Command and control interface for sending instructions to devices, 5) Alert system with customizable thresholds and notifications (email, SMS, push), 6) Device firmware update management with OTA capabilities, 7) Historical data storage and playback, 8) Dashboard with device status, connectivity, and battery levels, 9) API for third-party integrations, 10) Mobile-responsive design with PWA. Use React for frontend, Node.js/Express backend, PostgreSQL for device metadata, TimescaleDB for time-series data, MQTT broker for device communication, Redis for real-time data, and integrate with cloud IoT services. Implement comprehensive security with device authentication and TLS.