Azure IoT Hub
Cloud gateway service for managing millions of IoT and edge devices. Azure IoT Hub provides device management, monitoring, and secure communication. Supports MQTT, AMQP, HTTPS. Device twin technology for state and metadata. Direct methods for cloud-to-device commands. Twin desired and reported properties. Integration with Azure services. Monitoring and diagnostics. Enterprise security. Pay per million operations. Best for Microsoft ecosystem. Handles billions of messages.