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Implemented base data generation logic:\r\n    - Temperature: Seasonal/diurnal variations + occupancy effects\r\n    - Humidity: Inverse temp relationship + weather modeling\r\n    - CO₂: Class-time accumulation with ventilation simulation\r\n- Created foundational web visualization (`Subscriber-VisualWeb`)\r\n  - Real-time Chart.js integration\r\n  - Alert threshold system with visual indicators\r\n  - Multi-language support framework\r\n\r\n Lu Ziyue\r\n- Cloud Integration:\r\n  - Connected Publisher to EMQX Cloud (broker: `f09fd0fe.ala.dedicated.aws.emqxcloud.cn`)\r\n  - Integrated Subscriber with WebSocket MQTT (`wss://f09fd0fe...`)\r\n- Data Optimization:\r\n  - Enhanced temp/humidity interdependence logic\r\n  - Improved CO₂ class-time accumulation algorithm\r\n  - Added Gaussian noise for realistic fluctuations\r\n- Database System:\r\n  - Designed MySQL schema (`campus_monitoring.sensor_data`)\r\n  - Implemented data persistence in Publisher\r\n    \r\n- Visualization Enhancements:\r\n  - Chart smoothing with tension configuration\r\n  ```js\r\n  datasets: [{\r\n      tension: 0.4,  // Smoother curves\r\n      pointRadius: 1 // Cleaner visualization\r\n  }]\r\n\r\nShen Yeli\r\nCo-developed initial virtual sensor architecture\r\nContributed to core data generation algorithms\r\nAssisted in MQTT connectivity implementation","shortMessageHtmlLink":"Implement main modeling phase for Classroom Environment Monitoring Sy…"}},{"before":"d02ea61f9696d07e763e5bb8418e117f12d1aa30","after":"012898828d875ebe5a7e09457ff7e59a2a1ec51c","ref":"refs/heads/main","pushedAt":"2025-06-16T12:00:37.000Z","pushType":"push","commitsCount":1,"pusher":{"login":"luz34","name":"Ziyue Lu (luz34)","path":"/luz34","primaryAvatarUrl":"https://github.coventry.ac.uk/avatars/u/7809?s=80"},"commit":{"message":"Migrate MQTT implementation to EMQX Cloud broker\n\n Authorship & Responsibilities\r\n- Lu Ziyue:\r\n  - Primary development: Temperature & Humidity sensors\r\n  - Cloud integration for all sensor scripts\r\n  - Payload standardization (JSON format)\r\n- Wang Ruofan:\r\n  - Primary development: CO₂ sensor simulation\r\n  - Multi-location data modeling\r\n- Shen Yeli:\r\n  - Subscriber system development\r\n  - Authentication implementation\r\n  - Alert threshold system\r\n  - Collaborative modifications (CO₂ sensor and Subscriber\r\n\r\n Cloud Integration Modifications\r\n1. Broker Configuration:\r\n   python\r\n   # Before\r\n   BROKER = \"localhost\"\r\n   PORT = 1884\r\n\r\n   # After\r\n   BROKER = \"t3d30209.ala.dedicated.aliyun.emqxcloud.cn\"\r\n   PORT = 1883\r\n\r\n2.Authentication System:\r\nImplemented credential-based access\r\nPer-device unique credentials:\r\n\r\npython\r\n# Temperature Sensor\r\nUSERNAME = \"temp_sensor\"\r\nPASSWORD = \"temp23:39;4/10\"\r\n\r\n# CO₂ Sensor\r\nUSERNAME = \"CO2-sensor\"\r\nPASSWORD = \"CO223:39;4/10\"\r\n\r\n# Subscriber\r\nUSERNAME = \"administrator_subscriber\"\r\nPASSWORD = \"12345\"\r\n\r\n3.Payload Standardization:\r\nUnified JSON structure across devices:\r\njson\r\n{\r\n  \"device_id\": \"sensor_identifier\",\r\n  \"value\": 25.4,\r\n  \"timestamp\": \"2025-03-20 22:15:30\"\r\n}\r\n\r\n4.Topic Architecture:\r\nImplemented hierarchical namespace:\r\n  campus/{building}/{room}/{sensor_type}\r\nAdded retained messaging for temperature data\r\n\r\nKey Improvements\r\n☁️ Cloud Deployment: Transition from local to cloud-based MQTT broker\r\n🔒 Enhanced Security: TLS-ready implementation (port 8883 available)\r\n⚙️ QoS Implementation: Added Quality of Service level 1 for critical data\r\n⏱️ Timestamp Standardization: ISO 8601 format across all sensors\r\n🛡️ Error Handling: Robust connection exception management","shortMessageHtmlLink":"Migrate MQTT implementation to EMQX Cloud broker"}},{"before":"fc68345cfe16a1ef16263b1a00c63de4959f9284","after":"d02ea61f9696d07e763e5bb8418e117f12d1aa30","ref":"refs/heads/main","pushedAt":"2025-06-16T09:56:13.000Z","pushType":"push","commitsCount":1,"pusher":{"login":"luz34","name":"Ziyue Lu (luz34)","path":"/luz34","primaryAvatarUrl":"https://github.coventry.ac.uk/avatars/u/7809?s=80"},"commit":{"message":"Add MQTT sensor simulation scripts with local broker integration\n\n Sensor Implementation Authorship\r\n- `CO2_sensor.py`: Developed by Wang Ruofan (CO2 concentration simulation)\r\n- `Humidity_sensor.py`: Developed by Lu Ziyue (Humidity data simulation)\r\n- `Temperature_sensor.py`: Developed by Lu Ziyue (Temperature data simulation)\r\n- `Subscriber.py`: Developed by Shen Yeli (Central monitoring system)\r\n\r\n Modifications by Shen Yeli\r\n1. Local Broker Standardization:\r\n   - Unified connection parameters across all devices:\r\n     ```python\r\n     BROKER = \"localhost\"\r\n     PORT = 1884\r\n     \r\n   - Implemented consistent exception handling\r\n   - Added graceful disconnect procedures\r\n\r\n2. Protocol Enhancements:\r\n   - JSON payload standardization for all sensors\r\n   - QoS level 1 implementation for CO2 topic\r\n   - Topic hierarchy normalization:\r\n     campus/{location}/{sensor_type}\r\n     \r\n3. 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