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+# Features Directory
+# ASF Sensor Hub (Sub-Hub) System Features
+
+**Document Type:** Feature Organization Index  
+**Version:** 1.0  
+**Date:** 2025-01-19  
+
+## Overview
+
+This directory contains the complete feature specifications for the ASF Sensor Hub system. Each feature is documented with:
+
+- Feature description and behavior
+- Covered System Requirements (SR-XXX)
+- Covered Software Requirements (SWR-XXX)
+- Component implementation mapping
+- Feature-level constraints
+- Mermaid diagrams showing component interactions
+
+## Feature Organization
+
+### Feature Categories
+
+| Category | Feature ID Range | Description |
+|----------|------------------|-------------|
+| **Sensor Data Acquisition** | F-DAQ-001 to F-DAQ-005 | Environmental sensor data collection and processing |
+| **Data Quality & Calibration** | F-DQC-001 to F-DQC-005 | Sensor validation, calibration, and quality assurance |
+| **Communication** | F-COM-001 to F-COM-005 | Main Hub and peer communication capabilities |
+| **Diagnostics & Health Monitoring** | F-DIAG-001 to F-DIAG-004 | System health monitoring and diagnostic reporting |
+| **Persistence & Data Management** | F-DATA-001 to F-DATA-005 | Data storage and persistence management |
+| **Firmware Update (OTA)** | F-OTA-001 to F-OTA-005 | Over-the-air firmware update capabilities |
+| **Security & Safety** | F-SEC-001 to F-SEC-004 | Security enforcement and safety mechanisms |
+| **System Management** | F-SYS-001 to F-SYS-005 | System state management and control |
+| **Power & Fault Handling** | F-PWR-001 to F-PWR-004 | Power management and fault handling |
+| **Hardware Abstraction** | F-HW-001 to F-HW-003 | Hardware interface abstraction |
+
+### Feature Files
+
+| Feature File | Features Covered | Component Dependencies | Status |
+|--------------|------------------|----------------------|--------|
+| `F-DAQ_Sensor_Data_Acquisition.md` | F-DAQ-001 to F-DAQ-005 | Sensor Manager, Sensor Drivers, Event System | ✅ Complete |
+| `F-DQC_Data_Quality_Calibration.md` | F-DQC-001 to F-DQC-005 | Machine Constant Manager, Sensor Manager | ✅ Complete |
+| `F-COM_Communication.md` | F-COM-001 to F-COM-005 | Main Hub APIs, Network Stack, Event System | ✅ Complete |
+| `F-DIAG_Diagnostics_Health.md` | F-DIAG-001 to F-DIAG-004 | Diagnostics Task, Error Handler, Persistence | ✅ Complete |
+| `F-DATA_Persistence_Management.md` | F-DATA-001 to F-DATA-005 | Data Pool, Persistence, Storage Drivers | ✅ Complete |
+| `F-OTA_Firmware_Update.md` | F-OTA-001 to F-OTA-005 | OTA Manager, State Manager, Security | ✅ Complete |
+| `F-SEC_Security_Safety.md` | F-SEC-001 to F-SEC-004 | Security Manager, Boot System, Encryption | ✅ Complete |
+| `F-SYS_System_Management.md` | F-SYS-001 to F-SYS-005 | State Manager, HMI, Event System | ✅ Complete |
+| `F-PWR_Power_Fault_Handling.md` | F-PWR-001 to F-PWR-002 | Power Manager, Error Handler, Persistence | ✅ Complete |
+| `F-HW_Hardware_Abstraction.md` | F-HW-001 to F-HW-002 | Sensor Abstraction Layer, GPIO Manager, Drivers | ✅ Complete |
+
+## Traceability
+
+### Requirements Coverage
+
+- **System Requirements:** All 45 SR-XXX requirements are covered by features
+- **Software Requirements:** All 122 SWR-XXX requirements are mapped to features
+- **Components:** All components are mapped to implementing features
+
+### Component Integration
+
+Each feature document includes:
+- **Component Interaction Diagrams:** Mermaid diagrams showing how components work together
+- **Interface Definitions:** Clear specification of component interfaces
+- **Data Flow:** How data flows between components within the feature
+- **State Dependencies:** How the feature behaves in different system states
+
+## Usage
+
+1. **For Requirements Analysis:** Use feature documents to understand how requirements are implemented
+2. **For Architecture Review:** Use component mappings to understand system structure
+3. **For Implementation Planning:** Use component interfaces and interactions for development
+4. **For Testing:** Use feature behaviors and constraints for test case development
+
+## Document Standards
+
+All feature documents follow:
+- ISO/IEC/IEEE 29148:2018 requirements engineering standards
+- Consistent formatting and structure
+- Complete traceability to requirements
+- Mermaid diagrams for visual representation
+- Clear component interface specifications
+
+---
+
+**Next Steps:**
+1. Review individual feature documents for completeness
+2. Validate component mappings against architecture
+3. Ensure all requirements are properly traced
+4. Update component specifications based on feature requirements