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+# ASF Sensor Hub - System Design Documentation
+
+**Version:** 2.0  
+**Date:** 2025-01-19  
+**Status:** Final for Implementation Phase
+
+## Directory Structure
+
+```
+system_design/
+├── features/                          # Feature specifications
+│   ├── Features.md                    # Main feature catalog
+│   ├── [DAQ] Sensor Data Acquisition Features.md
+│   ├── [DQC] Data Quality & Calibration Features.md
+│   ├── [COM] Communication Features.md
+│   ├── [DIAG] Diagnostics & Health Monitoring Features.md
+│   ├── [DATA] Persistence & Data Management Features.md
+│   ├── [OTA] Firmware Update (OTA) Features.md
+│   ├── [SEC] Security & Safety Features.md
+│   ├── [SYS] System Management Features.md
+│   ├── [PWR] Power & Fault Handling Features.md
+│   ├── [HW] Hardware Abstraction Features.md
+│   ├── Cross-Feature Constraints.md
+│   ├── System Assumptions & Limitations.md
+│   └── System_Requirements_Traceability.csv  # Feature → SR mapping
+│
+├── specifications/                    # System specifications
+│   ├── System_State_Machine_Specification.md
+│   ├── Failure_Handling_Model.md
+│   └── System Review Checklist.md
+│
+├── SRS/                              # Software Requirements Specification
+│   ├── SRS.md                        # Main SRS document
+│   ├── Annex_A_Traceability.md
+│   ├── Annex_B_Interfaces.md
+│   ├── Annex_C_Budgets.md
+│   ├── VV_Matrix.md                  # Verification & Validation matrix
+│   └── Traceability_SWRS.csv         # SWR traceability
+│
+├── analysis/                         # Analysis and review documents
+│   ├── Gap_Analysis_and_Solutions.md
+│   └── Engineering_Review_Report.md
+│
+├── system_requirementsand_and_traceability.csv  # Original system requirements
+└── README.md                         # This file
+```
+
+## Document Overview
+
+### Features (`features/`)
+
+Contains all feature specifications with system requirements:
+- **10 feature groups** (DAQ, DQC, COM, DIAG, DATA, OTA, SEC, SYS, PWR, HW)
+- **39 features** total
+- **139 system requirements** (SR-*)
+- **System_Requirements_Traceability.csv** - Complete feature-to-requirement mapping
+
+### Specifications (`specifications/`)
+
+Core system specifications:
+- **System State Machine** - 11 states with transition rules
+- **Failure Handling Model** - Fault taxonomy and recovery behaviors
+- **System Review Checklist** - Gate criteria for implementation
+
+### SRS (`SRS/`)
+
+Software Requirements Specification (ISO/IEC/IEEE 29148 compliant):
+- **Main SRS** - Over 200 Software Requirements (SWR-*)
+- **Annexes** - Traceability, Interfaces, Budgets
+- **V&V Matrix** - Verification methods for all requirements
+
+### Analysis (`analysis/`)
+
+Analysis and review documents:
+- **Gap Analysis and Solutions** - Consolidated gap analysis with solutions
+- **Engineering Review Report** - Architecture review findings
+
+## Quick Reference
+
+### Feature Groups
+
+| Group | Features | System Requirements |
+|-------|----------|---------------------|
+| DAQ | 4 | 13 |
+| DQC | 5 | 18 |
+| COM | 4 | 17 |
+| DIAG | 4 | 14 |
+| DATA | 4 | 13 |
+| OTA | 5 | 16 |
+| SEC | 4 | 15 |
+| SYS | 5 | 17 |
+| PWR | 2 | 8 |
+| HW | 2 | 8 |
+| **TOTAL** | **39** | **139** |
+
+### System States
+
+1. INIT - Hardware and software initialization
+2. BOOT_FAILURE - Secure boot verification failed
+3. RUNNING - Normal sensor acquisition and communication
+4. WARNING - Non-fatal fault detected, degraded operation
+5. FAULT - Fatal error, core functionality disabled
+6. OTA_PREP - OTA preparation phase
+7. OTA_UPDATE - Firmware update in progress
+8. MC_UPDATE - Machine constants update in progress
+9. TEARDOWN - Controlled shutdown sequence
+10. SERVICE - Engineering or diagnostic interaction
+11. SD_DEGRADED - SD card failure detected, fallback mode
+
+### Technology Stack
+
+- **Hardware:** ESP32-S3
+- **Framework:** ESP-IDF v5.4
+- **Communication:** Wi-Fi 802.11n, MQTT over TLS 1.2, ESP-NOW
+- **Security:** Secure Boot V2, Flash Encryption (AES-256), mTLS
+- **Storage:** FAT32 (SD Card), NVS (Encrypted)
+- **OTA:** A/B Partitioning, SHA-256
+
+## Document Status
+
+**Status:** Final for Implementation Phase  
+**Next Phase:** Component Design → Implementation
+
+---
+
+**For questions or updates, refer to the individual feature specifications or system specifications.**