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4. Application Layer - Frontend 3. Service Layer - Backend 2. Network Layer - Broker 1. Perception Layer - Edge MQTT Publish JSON MQTT WS Subscribe MQTT Subscribe JDBC Insert HTTP GET /api/history SQL Query Result JSON React Dashboard User Java Service - Paho MQTT MySQL Database Eclipse Mosquitto TCP 1883 / WS 9001 Sensor DS18B20 / DHT11 ESP32-S3 MCU Wake -> Read -> Send -> Sleep