commit 286ef3e7fea9660fc15421193d7402a84c6d489c
Author: naab <nguyenduyban3002@gmail.com>
Date:   Thu May 29 11:05:45 2025 +0700

    first commit

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+# Modbus to MQTT Bridge Service
+
+A Python service that reads temperature and humidity data from a Modbus TCP server and publishes the data to an MQTT broker.
+
+## 📁 Project Structure
+
+```
+POE/
+├── config.py           # Configuration constants
+├── sensor_bridge.py    # Core logic for Modbus and MQTT operations
+├── main.py            # Entry point
+├── requirements.txt   # Python dependencies
+├── README.md         # This file
+├── poe.py            # Original single file (backup)
+└── memory-bank/      # Memory bank directory
+```
+
+## 🚀 Quick Start
+
+### 1. Install Dependencies
+```bash
+pip install -r requirements.txt
+```
+
+### 2. Configure Settings
+Edit `config.py` to match your environment:
+```python
+# Modbus configuration
+MODBUS_HOST = "10.84.48.153"
+MODBUS_PORT = 505
+
+# MQTT configuration  
+MQTT_BROKER = "mqtt.service.mesh"
+MQTT_TOPIC = "Temperature_Humidity"
+```
+
+### 3. Run the Service
+```bash
+python main.py
+```
+
+## 📊 Features
+
+- **Modbus TCP Client**: Reads data from Modbus holding registers
+- **MQTT Publisher**: Publishes sensor data to MQTT broker
+- **Data Processing**: Converts raw sensor values to calibrated readings
+- **Error Handling**: Robust error handling and retry mechanisms
+- **Logging**: Comprehensive logging for monitoring and debugging
+
+## 📈 Data Format
+
+The service publishes JSON data to the MQTT topic:
+```json
+{
+  "time": "2024-01-15 10:30:25",
+  "location": "Office",
+  "temperature": 23.5,
+  "humidity": 65.2
+}
+```
+
+## 🔧 Configuration
+
+All configuration is centralized in `config.py`:
+
+| Parameter | Description | Default |
+|-----------|-------------|---------|
+| `MODBUS_HOST` | Modbus TCP server IP | "10.84.48.153" |
+| `MODBUS_PORT` | Modbus TCP port | 505 |
+| `MQTT_BROKER` | MQTT broker address | "mqtt.service.mesh" |
+| `MQTT_TOPIC` | MQTT publish topic | "Temperature_Humidity" |
+| `PUBLISH_INTERVAL` | Data publish interval (seconds) | 10 |
+| `LOCATION` | Sensor location identifier | "Office" |
+
+## 📡 Sensor Mapping
+
+- **Register 0**: Temperature (raw value × 0.1 - 40)
+- **Register 1**: Humidity (raw value × 0.1)
+
+## 🛠️ Maintenance
+
+### Running as a Service
+
+For production deployment, consider running as a system service:
+
+```bash
+# Example systemd service file
+[Unit]
+Description=Modbus MQTT Bridge
+After=network.target
+
+[Service]
+Type=simple
+User=pi
+WorkingDirectory=/path/to/POE
+ExecStart=/usr/bin/python3 main.py
+Restart=always
+
+[Install]
+WantedBy=multi-user.target
+```
+
+### Monitoring
+
+The service provides comprehensive logging. Monitor the logs for:
+- Connection status
+- Data reading success/failure
+- MQTT publish status
+- Error conditions
+
+## 🤝 Contributing
+
+1. Fork the repository
+2. Create a feature branch
+3. Make your changes
+4. Test thoroughly
+5. Submit a pull request
+
+## 📝 License
+
+This project is licensed under the MIT License. 
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