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Software Requirements Specification (SRS)

ASF Sensor Hub (Sub-Hub) Embedded System

Document ID: SRS-ASF-SensorHub-SW-001
Version: 2.0
Date: 2025-02-01
Standard: ISO/IEC/IEEE 29148:2018
Scope: Software Requirements for ASF Sensor Hub (Sub-Hub)
Platform: ESP32-S3, ESP-IDF v5.4, C/C++
Domain: Industrial/Agricultural Automation (Smart Poultry Farm)

1. Introduction

1.1 Purpose

This Software Requirements Specification (SRS) defines the complete set of software requirements for the ASF Sensor Hub (Sub-Hub) embedded system. This document serves as the authoritative source for all functional and non-functional software requirements that must be satisfied by the implementation.

1.2 Scope

The ASF Sensor Hub software is responsible for:

  • Sensor Data Acquisition: Multi-sensor environmental monitoring with local preprocessing
  • Data Quality & Calibration: Sensor validation, failure detection, and calibration management
  • Communication: Secure bidirectional communication with Main Hub and peer coordination
  • Diagnostics & Health Monitoring: Comprehensive system health monitoring and fault management
  • Persistence & Data Management: Reliable data storage with integrity protection
  • Firmware Update (OTA): Secure over-the-air firmware updates with rollback capability
  • Security & Safety: Hardware-enforced security with encrypted communication
  • System Management: State machine control, teardown coordination, and local HMI
  • Power & Fault Handling: Graceful degradation and recovery mechanisms
  • Hardware Abstraction: Platform-independent sensor and peripheral interfaces

Explicitly out of scope:

  • Main Hub processing and control logic
  • Cloud analytics and services
  • Farm control algorithms and actuator management
  • Hardware design specifications

1.3 Definitions and Acronyms

Term Definition
SWR Software Requirement (unique identifier format: SWR-XXX-NNN)
SR System Requirement (from system design documents)
Sub-Hub The ASF Sensor Hub embedded system (this system)
Main Hub Central processing unit that coordinates multiple Sub-Hubs
MC Machine Constants - persistent configuration and calibration data
DP Data Persistence component - sole interface for persistent storage
STM State Manager component - system state machine controller
SAL Sensor Abstraction Layer - uniform sensor interface
HMI Human-Machine Interface (OLED display + navigation buttons)
OTA Over-The-Air firmware update mechanism
mTLS Mutual Transport Layer Security
CBOR Concise Binary Object Representation
ESP-NOW ESP32 proprietary peer-to-peer communication protocol

1.4 References

  • System Requirements: 0 system_design/SRS/SRS.md
  • System Features: 0 system_design/features/Features.md
  • Cross-Feature Constraints: 0 system_design/features/Cross-Feature Constraints.md
  • System State Machine: 0 system_design/specifications/System_State_Machine_Specification.md
  • Failure Handling Model: 0 system_design/specifications/Failure_Handling_Model.md
  • ISO/IEC/IEEE 29148:2018 - Requirements engineering standard
  • IEC 61508 - Functional safety standard
  • ESP-IDF v5.4 Programming Guide

1.5 Document Organization

This SRS is organized as follows:

  • Section 2: Overall Description (product perspective, functions, constraints)
  • Section 3: Software Requirements (functional, interface, performance, design, quality)
  • Section 4: Traceability (SR → SWR mapping)
  • Section 5: Verification Methods

2. Overall Description

2.1 Product Perspective

The ASF Sensor Hub software operates on ESP32-S3 hardware within a distributed poultry farm automation network. The software interfaces with:

  • Environmental sensors via I2C, SPI, UART, and analog interfaces
  • Main Hub via encrypted Wi-Fi communication (MQTT over TLS 1.2)
  • Peer Sub-Hubs via ESP-NOW for limited coordination
  • Local operators via OLED display and button interface
  • SD Card for persistent data storage
  • Internal NVM for configuration and security data

2.2 Product Functions

The software provides the following major functions organized by feature groups:

2.2.1 Sensor Data Acquisition (DAQ)

  • Multi-sensor simultaneous data acquisition
  • High-frequency sampling with local filtering
  • Timestamped sensor data generation
  • Sensor state management and validation

2.2.2 Data Quality & Calibration (DQC)

  • Automatic sensor detection and type enforcement
  • Sensor failure detection and classification
  • Machine Constants management and application
  • Calibration parameter handling

2.2.3 Communication (COM)

  • Main Hub bidirectional communication
  • On-demand data broadcasting
  • Peer Sensor Hub coordination
  • Communication fault tolerance

2.2.4 Diagnostics & Health Monitoring (DIAG)

  • Structured diagnostic code management
  • Persistent diagnostic data storage
  • Diagnostic session support
  • Layered watchdog system

2.2.5 Persistence & Data Management (DATA)

  • Persistent sensor data storage
  • Data persistence abstraction (DP component)
  • Safe data handling during state transitions
  • Storage capacity and wear management

2.2.6 Firmware Update (OTA)

  • OTA update negotiation and coordination
  • Firmware reception and integrity validation
  • Safe firmware activation with rollback
  • OTA state management

2.2.7 Security & Safety (SEC)

  • Secure boot and flash encryption
  • Certificate management and validation
  • Encrypted communication channels
  • Security violation detection and response

2.2.8 System Management (SYS)

  • System state machine implementation
  • Controlled teardown mechanism
  • Local human-machine interface
  • Engineering access and debug sessions

2.2.9 Power & Fault Handling (PWR)

  • Brownout detection and recovery
  • Fault classification and escalation
  • Graceful degradation mechanisms

2.2.10 Hardware Abstraction (HW)

  • Sensor abstraction layer
  • Hardware interface abstraction
  • GPIO discipline and resource management

2.3 User Classes and Characteristics

User Class Characteristics Software Interaction
Farm Operators Basic technical knowledge, daily monitoring Local HMI for status checking and basic diagnostics
Maintenance Engineers Advanced technical knowledge, periodic maintenance Debug sessions, diagnostic data access, system health monitoring
System Integrators Expert technical knowledge, system configuration Machine constants management, OTA updates, engineering access
Main Hub System Automated system, continuous operation Bidirectional communication, data requests, control commands

2.4 Operating Environment

2.4.1 Hardware Environment

  • Microcontroller: ESP32-S3 (dual-core, 512KB SRAM, 8MB Flash)
  • Sensors: I2C, SPI, UART, and analog environmental sensors
  • Storage: SD Card (FAT32), Internal NVM (encrypted)
  • Display: OLED 128x64 pixels (I2C interface)
  • Input: 3x GPIO buttons (Up, Down, Select)
  • Communication: Wi-Fi 802.11n (2.4 GHz), ESP-NOW

2.4.2 Software Environment

  • Operating System: FreeRTOS (via ESP-IDF framework)
  • Development Framework: ESP-IDF v5.4
  • Programming Language: C/C++ (MISRA C:2012 compliant)
  • Security: Secure Boot V2, Flash Encryption (AES-256)
  • Communication: MQTT over TLS 1.2, CBOR encoding

2.4.3 Physical Environment

  • Location: Industrial poultry house environment
  • Temperature: -10°C to +60°C operating range
  • Humidity: Up to 95% relative humidity
  • Contaminants: Dust, ammonia, organic particles
  • Power: 12V DC with brownout protection
  • Enclosure: IP65 rated protection

2.5 Design and Implementation Constraints

2.5.1 Hardware Constraints

  • Memory: 512KB SRAM, 8MB Flash (ESP32-S3 limitations)
  • Processing: Dual-core 240MHz (shared with ESP-IDF framework)
  • I/O: Limited GPIO pins for sensors and peripherals
  • Storage: SD card subject to wear and environmental failure
  • Power: Continuous AC power with brief interruption tolerance

2.5.2 Software Constraints

  • Framework: ESP-IDF v5.4 mandatory (platform dependency)
  • Real-time: FreeRTOS task scheduling with deterministic timing
  • Memory Management: Static allocation preferred, minimal dynamic allocation
  • Security: Hardware-enforced Secure Boot V2 and Flash Encryption
  • Communication: TLS 1.2 mandatory for all external communication

2.5.3 Regulatory Constraints

  • Safety: IEC 61508 SIL-1 compliance for sensor data integrity
  • Security: Encrypted storage and communication mandatory
  • Environmental: Animal welfare regulations compliance
  • Electromagnetic: CE/FCC compliance for wireless communication

2.5.4 Operational Constraints

  • Availability: 99.9% uptime requirement in normal conditions
  • Maintenance: Unattended operation (24/7) with remote diagnostics
  • Updates: OTA firmware updates with minimal downtime
  • Recovery: Automatic recovery from transient faults within 30 seconds

2.6 Assumptions and Dependencies

2.6.1 Assumptions

  • Sensors: Pre-configured and compatible with defined interfaces
  • Time Synchronization: Main Hub provides accurate time reference
  • Cryptographic Keys: Securely provisioned during manufacturing
  • Power: Brief interruptions (< 1 second) are acceptable
  • Network: Wi-Fi infrastructure available and stable
  • Storage: SD card properly formatted and functional

2.6.2 Dependencies

  • ESP-IDF Framework: Version 5.4 availability and stability
  • Sensor Drivers: Compatible drivers for all supported sensor types
  • Main Hub Protocol: Communication protocol compatibility
  • Certificate Authority: PKI infrastructure for certificate management
  • Time Source: NTP or Main Hub time synchronization

3. Software Requirements

3.1 Functional Requirements

3.1.1 System State Management (SWR-SYS-001 through SWR-SYS-020)

SWR-SYS-001: The software SHALL implement a finite state machine (FSM) with the following states: INIT, BOOT_FAILURE, RUNNING, WARNING, FAULT, OTA_PREP, OTA_UPDATE, MC_UPDATE, TEARDOWN, SERVICE, SD_DEGRADED.

Traceability: SR-SYS-001
Verification: Test, Inspection

SWR-SYS-002: The software SHALL enforce valid state transitions as defined in the System State Machine Specification and reject invalid transition requests.

Traceability: SR-SYS-001
Verification: Test

SWR-SYS-003: The software SHALL restrict feature operations based on the current system state according to per-state execution rules defined in Cross-Feature Constraints.

Traceability: SR-SYS-002, CFC-ARCH-02
Verification: Test

SWR-SYS-004: The software SHALL notify all registered components when a state transition occurs via the Event System within 10ms of transition completion.

Traceability: SR-SYS-003
Verification: Test

SWR-SYS-005: The software SHALL execute a controlled teardown sequence before firmware updates, machine constant updates, or system resets.

Traceability: SR-SYS-004
Verification: Test

SWR-SYS-006: The software SHALL persist all critical runtime data before completing a teardown sequence and verify persistence completion.

Traceability: SR-SYS-005, CFC-DATA-02
Verification: Test

SWR-SYS-007: The software SHALL prevent data corruption during teardown and reset operations by completing all pending write operations.

Traceability: SR-SYS-006
Verification: Test

SWR-SYS-008: The software SHALL provide a local OLED display interface using I2C communication protocol with 128x64 pixel resolution.

Traceability: SR-SYS-007
Verification: Test, Demonstration

SWR-SYS-009: The software SHALL display connectivity status, system state, connected sensor summary, and current time/date on the OLED display with automatic refresh every 5 seconds.

Traceability: SR-SYS-008
Verification: Test, Demonstration

SWR-SYS-010: The software SHALL provide menu navigation using Up, Down, and Select buttons with debouncing and repeat functionality.

Traceability: SR-SYS-009
Verification: Test, Demonstration

SWR-SYS-011: The software SHALL provide diagnostic, sensor status, and system health information through the local OLED menu interface with hierarchical navigation.

Traceability: SR-SYS-010
Verification: Test, Demonstration

SWR-SYS-012: The software SHALL support diagnostic sessions for retrieving system status, diagnostic data, and configuration information via authenticated access.

Traceability: SR-SYS-011
Verification: Test

SWR-SYS-013: The software SHALL support debug sessions allowing controlled engineering commands with authentication and authorization checks.

Traceability: SR-SYS-012
Verification: Test

SWR-SYS-014: The software SHALL restrict debug session actions to authorized engineering access only using certificate-based authentication.

Traceability: SR-SYS-013, CFC-DBG-01
Verification: Test

SWR-SYS-015: The software SHALL ensure debug sessions do not interfere with normal sensor acquisition or communication operations.

Traceability: SR-SYS-013, CFC-DBG-01
Verification: Test

SWR-SYS-016: The software SHALL implement state transition timeouts to prevent indefinite blocking in intermediate states.

Traceability: Quality requirement
Verification: Test

SWR-SYS-017: The software SHALL log all state transitions with timestamps and transition reasons for diagnostic purposes.

Traceability: Quality requirement
Verification: Test

SWR-SYS-018: The software SHALL validate state transition preconditions before executing transitions and reject invalid requests.

Traceability: Quality requirement
Verification: Test

SWR-SYS-019: The software SHALL provide state query interfaces for components to check current state and transition validity.

Traceability: Architecture requirement
Verification: Test

SWR-SYS-020: The software SHALL coordinate teardown sequence with all active components and wait for completion acknowledgments.

Traceability: Architecture requirement
Verification: Test

3.1.2 Sensor Data Acquisition (SWR-DAQ-001 through SWR-DAQ-020)

SWR-DAQ-001: The software SHALL support simultaneous acquisition of environmental data from multiple sensor types: temperature, humidity, CO2, NH3, VOC, particulate matter, and light intensity.

Traceability: SR-DAQ-001
Verification: Test

SWR-DAQ-002: The software SHALL assign each supported sensor type to a predefined and unique hardware slot with dedicated GPIO and communication interface.

Traceability: SR-DAQ-002
Verification: Inspection, Test

SWR-DAQ-003: The software SHALL detect the physical presence of each sensor via a dedicated hardware detection signal prior to sensor initialization.

Traceability: SR-DAQ-003
Verification: Test

SWR-DAQ-004: The software SHALL initialize and activate only sensors that are detected as present and enabled in Machine Constants configuration.

Traceability: SR-DAQ-004
Verification: Test

SWR-DAQ-005: The software SHALL sample each enabled sensor multiple times within a single acquisition cycle (configurable, default: 10 samples per sensor per cycle).

Traceability: SR-DAQ-005
Verification: Test

SWR-DAQ-006: The software SHALL apply a configurable local filtering mechanism (median filter, moving average) to raw sensor samples to produce a single filtered sensor value per acquisition cycle.

Traceability: SR-DAQ-006
Verification: Test

SWR-DAQ-007: The software SHALL complete each sensor's sampling and filtering process within a bounded and deterministic time window (maximum 100ms per sensor).

Traceability: SR-DAQ-007, CFC-TIME-02
Verification: Test

SWR-DAQ-008: The software SHALL generate a timestamp for each filtered sensor value upon completion of the acquisition and filtering process using system time.

Traceability: SR-DAQ-008
Verification: Test

SWR-DAQ-009: The software SHALL generate a timestamped sensor data record containing: sensor identifier, sensor type, filtered value, unit of measurement, timestamp, and data validity status.

Traceability: SR-DAQ-009
Verification: Test, Inspection

SWR-DAQ-010: The software SHALL maintain the most recent timestamped sensor data record in memory (Data Pool) and make it available for persistence and communication requests.

Traceability: SR-DAQ-010
Verification: Test

SWR-DAQ-011: The software SHALL NOT perform sensor acquisition during OTA_UPDATE, MC_UPDATE, or TEARDOWN states.

Traceability: CFC-ARCH-02
Verification: Test

SWR-DAQ-012: The software SHALL perform sensor acquisition in a non-blocking manner using task-based scheduling.

Traceability: CFC-TIME-01
Verification: Test

SWR-DAQ-013: The software SHALL use deterministic memory allocation for sensor acquisition buffers (no dynamic allocation in acquisition path).

Traceability: CFC-TIME-02
Verification: Inspection, Test

SWR-DAQ-014: The software SHALL publish sensor data updates via the Event System upon completion of each acquisition cycle.

Traceability: Architecture requirement
Verification: Test

SWR-DAQ-015: The software SHALL exclude failed sensors from acquisition cycles as defined by the failure handling model.

Traceability: SR-DQC-009
Verification: Test

SWR-DAQ-016: The software SHALL implement sensor warmup periods before considering sensor data valid (configurable per sensor type).

Traceability: Quality requirement
Verification: Test

SWR-DAQ-017: The software SHALL validate sensor readings against configured range limits and mark out-of-range values as invalid.

Traceability: Quality requirement
Verification: Test

SWR-DAQ-018: The software SHALL implement acquisition cycle scheduling with configurable intervals (default: 1 second).

Traceability: Performance requirement
Verification: Test

SWR-DAQ-019: The software SHALL provide sensor status information including presence, health, last reading time, and error counts.

Traceability: Quality requirement
Verification: Test

SWR-DAQ-020: The software SHALL implement sensor driver abstraction layer (SAL) providing uniform interfaces for different sensor types.

Traceability: Architecture requirement
Verification: Inspection

3.1.3 Data Quality & Calibration (SWR-DQC-001 through SWR-DQC-020)

SWR-DQC-001: The software SHALL detect the physical presence of each sensor using a dedicated hardware-based detection mechanism during system initialization.

Traceability: SR-DQC-001
Verification: Test

SWR-DQC-002: The software SHALL perform sensor presence detection during system startup and after any reinitialization or reconfiguration event.

Traceability: SR-DQC-002
Verification: Test

SWR-DQC-003: The software SHALL initialize and activate only sensors that are detected as present and match the expected sensor type.

Traceability: SR-DQC-003
Verification: Test

SWR-DQC-004: The software SHALL assign each physical sensor slot to a predefined sensor type as defined in Machine Constants configuration.

Traceability: SR-DQC-004
Verification: Test

SWR-DQC-005: The software SHALL verify that a detected sensor matches the expected sensor type for its assigned slot using sensor identification mechanisms.

Traceability: SR-DQC-005
Verification: Test

SWR-DQC-006: The software SHALL reject and report any sensor-slot mismatch as a diagnostic event with ERROR severity.

Traceability: SR-DQC-006
Verification: Test

SWR-DQC-007: The software SHALL continuously monitor sensor responsiveness and signal validity during normal operation.

Traceability: SR-DQC-007
Verification: Test

SWR-DQC-008: The software SHALL detect sensor failures including disconnection, non-responsiveness, and out-of-range measurement values.

Traceability: SR-DQC-008
Verification: Test

SWR-DQC-009: The software SHALL mark detected faulty sensors as defective and exclude them from data acquisition and reporting.

Traceability: SR-DQC-009
Verification: Test

SWR-DQC-010: The software SHALL report detected sensor failures to the Main Hub with timestamps and failure classification.

Traceability: SR-DQC-010
Verification: Test

SWR-DQC-011: The software SHALL maintain a Machine Constants dataset defining sensor configuration, calibration parameters, and communication identifiers.

Traceability: SR-DQC-011
Verification: Test, Inspection

SWR-DQC-012: The software SHALL store the Machine Constants dataset in non-volatile storage with integrity protection.

Traceability: SR-DQC-012
Verification: Test

SWR-DQC-013: The software SHALL load and apply the Machine Constants dataset during system initialization and validate data integrity.

Traceability: SR-DQC-013
Verification: Test

SWR-DQC-014: The software SHALL support remote updates of the Machine Constants dataset initiated by the Main Hub with authentication.

Traceability: SR-DQC-014
Verification: Test

SWR-DQC-015: The software SHALL apply updated Machine Constants only after executing a controlled teardown and reinitialization procedure.

Traceability: SR-DQC-015
Verification: Test

SWR-DQC-016: The software SHALL validate Machine Constants integrity using checksums before applying updates.

Traceability: SR-SEC-008
Verification: Test

SWR-DQC-017: The software SHALL NOT perform sensor calibration during OTA_UPDATE, MC_UPDATE, or TEARDOWN states.

Traceability: CFC-ARCH-02
Verification: Test

SWR-DQC-018: The software SHALL access Machine Constants only through the DP component interface.

Traceability: CFC-ARCH-01, CFC-DATA-01
Verification: Inspection

SWR-DQC-019: The software SHALL apply calibration parameters to raw sensor readings to produce calibrated values.

Traceability: Quality requirement
Verification: Test

SWR-DQC-020: The software SHALL maintain sensor failure statistics and report trends to diagnostic system.

Traceability: Quality requirement
Verification: Test

3.1.4 Communication (SWR-COM-001 through SWR-COM-020)

SWR-COM-001: The software SHALL support bidirectional communication between the Sensor Hub and the Main Hub using MQTT over TLS 1.2.

Traceability: SR-COM-001
Verification: Test

SWR-COM-002: The software SHALL transmit sensor data, diagnostics information, and system status to the Main Hub using CBOR encoding.

Traceability: SR-COM-002
Verification: Test

SWR-COM-003: The software SHALL receive commands, configuration updates, and firmware update requests from the Main Hub.

Traceability: SR-COM-003
Verification: Test

SWR-COM-004: The software SHALL monitor the status of the communication link with the Main Hub and report link availability and failure conditions.

Traceability: SR-COM-004
Verification: Test

SWR-COM-005: The software SHALL support on-demand requests from the Main Hub for sensor data with response time ≤ 100ms.

Traceability: SR-COM-005
Verification: Test

SWR-COM-006: The software SHALL respond to on-demand data requests with the most recent timestamped sensor data from the Data Pool.

Traceability: SR-COM-006
Verification: Test

SWR-COM-007: The software SHALL include sensor status and data validity information in on-demand data responses.

Traceability: SR-COM-007
Verification: Test

SWR-COM-008: The software SHALL support limited peer-to-peer communication between Sensor Hubs using ESP-NOW for connectivity checks and time synchronization.

Traceability: SR-COM-008, SR-COM-009
Verification: Test

SWR-COM-009: The software SHALL ensure that peer Sensor Hub communication does not interfere with Main Hub communication or control operations.

Traceability: SR-COM-010
Verification: Test

SWR-COM-010: The software SHALL encrypt all communication with the Main Hub using TLS 1.2 with mutual authentication.

Traceability: SR-SEC-009, CFC-SEC-02
Verification: Test

SWR-COM-011: The software SHALL ensure integrity and authenticity of all transmitted and received messages using message authentication codes.

Traceability: SR-SEC-010
Verification: Test

SWR-COM-012: The software SHALL limit communication operations during TEARDOWN state to session closure only.

Traceability: CFC-ARCH-02
Verification: Test

SWR-COM-013: The software SHALL perform communication operations in a non-blocking manner using task-based scheduling.

Traceability: CFC-TIME-01
Verification: Test

SWR-COM-014: The software SHALL report communication link failures as diagnostic events according to the failure handling model.

Traceability: SR-COM-004, Failure Handling Model
Verification: Test

SWR-COM-015: The software SHALL detect and report communication security violations to the Main Hub and diagnostic system.

Traceability: SR-SEC-012
Verification: Test

SWR-COM-016: The software SHALL implement heartbeat mechanism with 10-second interval and 30-second timeout detection.

Traceability: Quality requirement
Verification: Test

SWR-COM-017: The software SHALL support automatic reconnection with exponential backoff on communication link failure.

Traceability: Quality requirement
Verification: Test

SWR-COM-018: The software SHALL encrypt ESP-NOW peer communication using application-layer encryption (AES-128 minimum).

Traceability: Security requirement
Verification: Test

SWR-COM-019: The software SHALL implement message queuing for store-and-forward capability during communication outages.

Traceability: Quality requirement
Verification: Test

SWR-COM-020: The software SHALL validate message format and version compatibility for all received messages.

Traceability: Quality requirement
Verification: Test

[Continue with remaining sections...]

3.1.5 Diagnostics & Health Monitoring (SWR-DIAG-001 through SWR-DIAG-020)

SWR-DIAG-001: The software SHALL implement a diagnostic code framework for reporting system health conditions, warnings, errors, and fatal faults with unique identifiers.

Traceability: SR-DIAG-001
Verification: Test, Inspection

SWR-DIAG-002: The software SHALL assign a unique diagnostic code to each detected fault or abnormal condition using format 0xSCCC (S=severity, CCC=code).

Traceability: SR-DIAG-002
Verification: Test, Inspection

SWR-DIAG-003: The software SHALL classify diagnostic codes by severity level (INFO, WARNING, ERROR, FATAL) with defined escalation rules.

Traceability: SR-DIAG-003
Verification: Test

SWR-DIAG-004: The software SHALL associate each diagnostic event with a timestamp and the originating system component identifier.

Traceability: SR-DIAG-004
Verification: Test

SWR-DIAG-005: The software SHALL persist diagnostic events in non-volatile storage through the DP component interface.

Traceability: SR-DIAG-005
Verification: Test

SWR-DIAG-006: The software SHALL retain diagnostic data across system resets and power cycles with data integrity protection.

Traceability: SR-DIAG-006
Verification: Test

SWR-DIAG-007: The software SHALL implement a bounded diagnostic storage mechanism with circular buffer and configurable retention policy.

Traceability: SR-DIAG-007
Verification: Test

SWR-DIAG-008: The software SHALL provide a diagnostic session interface for accessing diagnostic and system health data via authenticated access.

Traceability: SR-DIAG-008
Verification: Test

SWR-DIAG-009: The software SHALL allow authorized diagnostic sessions to retrieve stored diagnostic events with filtering capabilities.

Traceability: SR-DIAG-009
Verification: Test

SWR-DIAG-010: The software SHALL allow authorized diagnostic sessions to clear stored diagnostic records with confirmation.

Traceability: SR-DIAG-010
Verification: Test

SWR-DIAG-011: The software SHALL ensure that diagnostic sessions do not interfere with normal sensor acquisition or communication operations.

Traceability: SR-DIAG-011, CFC-DBG-01
Verification: Test

SWR-DIAG-012: The software SHALL trigger state transitions based on diagnostic severity according to the failure handling model.

Traceability: Failure Handling Model, SR-SYS-002
Verification: Test

SWR-DIAG-013: The software SHALL implement fault latching behavior as defined in the failure handling model.

Traceability: Failure Handling Model
Verification: Test

SWR-DIAG-014: The software SHALL implement fault escalation rules as defined in the failure handling model.

Traceability: Failure Handling Model
Verification: Test

SWR-DIAG-015: The software SHALL report WARNING, ERROR, and FATAL diagnostic events to the Main Hub within 5 seconds of detection.

Traceability: SR-COM-002
Verification: Test

SWR-DIAG-016: The software SHALL provide diagnostic information through the local OLED menu interface with hierarchical display.

Traceability: SR-SYS-010
Verification: Test, Demonstration

SWR-DIAG-017: The software SHALL access diagnostic storage only through the DP component interface.

Traceability: CFC-ARCH-01, CFC-DATA-01
Verification: Inspection

SWR-DIAG-018: The software SHALL NOT generate new diagnostic events during TEARDOWN state (except teardown-specific diagnostics).

Traceability: CFC-ARCH-02
Verification: Test

SWR-DIAG-019: The software SHALL implement watchdog mechanisms at task, interrupt, and system levels with configurable timeouts.

Traceability: Quality requirement
Verification: Test

SWR-DIAG-020: The software SHALL provide diagnostic event statistics and trending information for system health assessment.

Traceability: Quality requirement
Verification: Test

3.1.6 Persistence & Data Management (SWR-DATA-001 through SWR-DATA-020)

SWR-DATA-001: The software SHALL persist timestamped sensor data in non-volatile storage using wear-aware batch writing.

Traceability: SR-DATA-001
Verification: Test

SWR-DATA-002: The software SHALL store sensor data together with sensor identifiers, timestamps, and validity status in structured format.

Traceability: SR-DATA-002
Verification: Test

SWR-DATA-003: The software SHALL support configurable data retention and overwrite policies for persisted sensor data.

Traceability: SR-DATA-003
Verification: Test

SWR-DATA-004: The software SHALL provide a Data Persistence (DP) component as the sole interface for persistent data access.

Traceability: SR-DATA-004, CFC-ARCH-01
Verification: Inspection

SWR-DATA-005: The software SHALL prevent application and feature modules from directly accessing storage hardware.

Traceability: SR-DATA-005, CFC-ARCH-01
Verification: Inspection

SWR-DATA-006: The DP component SHALL support serialization and deserialization of structured system data using defined formats.

Traceability: SR-DATA-006
Verification: Test

SWR-DATA-007: The software SHALL flush all critical runtime data to non-volatile storage before entering a controlled teardown or reset state.

Traceability: SR-DATA-007, SR-SYS-005
Verification: Test

SWR-DATA-008: The software SHALL protect data integrity during firmware updates and machine constant updates using atomic operations.

Traceability: SR-DATA-008
Verification: Test

SWR-DATA-009: The software SHALL verify successful data persistence before completing a system state transition.

Traceability: SR-DATA-009, CFC-DATA-02
Verification: Test

SWR-DATA-010: The software SHALL NOT perform data write operations during TEARDOWN state unless explicitly authorized by the System Manager.

Traceability: CFC-DATA-02
Verification: Test

SWR-DATA-011: The software SHALL ensure persistence completion is confirmed before state transitions that require data consistency.

Traceability: CFC-DATA-02
Verification: Test

SWR-DATA-012: The software SHALL handle SD card failures gracefully by entering SD_DEGRADED state and disabling persistence writes.

Traceability: System State Machine Specification
Verification: Test

SWR-DATA-013: The software SHALL implement wear-aware storage management to prevent premature SD card failure.

Traceability: Quality requirement
Verification: Test

SWR-DATA-014: The software SHALL maintain a single source of truth for runtime and persistent data through the DP component.

Traceability: CFC-DATA-01
Verification: Inspection

SWR-DATA-015: The software SHALL NOT allow features to maintain private persistent copies of shared system data.

Traceability: CFC-DATA-01
Verification: Inspection

SWR-DATA-016: The software SHALL implement data integrity checks using checksums for all persistent data.

Traceability: Quality requirement
Verification: Test

SWR-DATA-017: The software SHALL support data backup and recovery mechanisms for critical system data.

Traceability: Quality requirement
Verification: Test

SWR-DATA-018: The software SHALL implement storage capacity monitoring and alert when storage space is low.

Traceability: Quality requirement
Verification: Test

SWR-DATA-019: The software SHALL support data export functionality for diagnostic and maintenance purposes.

Traceability: Quality requirement
Verification: Test

SWR-DATA-020: The software SHALL implement secure deletion of sensitive data when required.

Traceability: Security requirement
Verification: Test

3.1.7 Firmware Update (OTA) (SWR-OTA-001 through SWR-OTA-025)

SWR-OTA-001: The software SHALL support OTA update negotiation initiated by the Main Hub with capability verification.

Traceability: SR-OTA-001
Verification: Test

SWR-OTA-002: The software SHALL verify internal readiness conditions before accepting an OTA update request.

Traceability: SR-OTA-002
Verification: Test

SWR-OTA-003: The software SHALL explicitly acknowledge or reject OTA update requests with reason codes.

Traceability: SR-OTA-003
Verification: Test

SWR-OTA-004: The software SHALL receive firmware images over the established communication interface with progress reporting.

Traceability: SR-OTA-004
Verification: Test

SWR-OTA-005: The software SHALL store received firmware images in non-volatile storage prior to validation.

Traceability: SR-OTA-005
Verification: Test

SWR-OTA-006: The software SHALL prevent overwriting the active firmware during firmware reception using A/B partitioning.

Traceability: SR-OTA-006
Verification: Test

SWR-OTA-007: The software SHALL validate the integrity of received firmware images using SHA-256 checksums before activation.

Traceability: SR-OTA-007
Verification: Test

SWR-OTA-008: The software SHALL reject firmware images that fail integrity validation and report failure reason.

Traceability: SR-OTA-008
Verification: Test

SWR-OTA-009: The software SHALL report firmware validation and OTA status to the Main Hub throughout the process.

Traceability: SR-OTA-009
Verification: Test

SWR-OTA-010: The software SHALL execute a controlled teardown procedure prior to firmware activation.

Traceability: SR-OTA-010, SR-SYS-004
Verification: Test

SWR-OTA-011: The software SHALL persist critical runtime data and calibration data before flashing new firmware.

Traceability: SR-OTA-011, SR-SYS-005
Verification: Test

SWR-OTA-012: The software SHALL activate new firmware only after successful integrity validation and secure boot verification.

Traceability: SR-OTA-012
Verification: Test

SWR-OTA-013: The software SHALL reboot into the new firmware after successful activation with rollback capability.

Traceability: SR-OTA-013
Verification: Test

SWR-OTA-014: The software SHALL use encrypted and authenticated communication channels for OTA firmware updates.

Traceability: SR-SEC-011, CFC-SEC-02
Verification: Test

SWR-OTA-015: The software SHALL transition to OTA_PREP state upon accepting an OTA request.

Traceability: System State Machine Specification
Verification: Test

SWR-OTA-016: The software SHALL NOT allow OTA operations during WARNING, FAULT, SERVICE, or SD_DEGRADED states.

Traceability: System State Machine Specification, CFC-ARCH-02
Verification: Test

SWR-OTA-017: The software SHALL complete OTA operations within a maximum duration of 10 minutes.

Traceability: Quality requirement
Verification: Test

SWR-OTA-018: The software SHALL handle OTA failures by transitioning to FAULT state and reporting the failure.

Traceability: System State Machine Specification, Failure Handling Model
Verification: Test

SWR-OTA-019: The software SHALL protect active firmware from corruption during OTA operations.

Traceability: SR-OTA-006
Verification: Test

SWR-OTA-020: The software SHALL verify firmware authenticity using secure boot mechanisms before execution.

Traceability: SR-SEC-001, SR-SEC-002
Verification: Test

SWR-OTA-021: The software SHALL implement automatic rollback on firmware boot failure within 3 boot attempts.

Traceability: Quality requirement
Verification: Test

SWR-OTA-022: The software SHALL validate firmware version compatibility before accepting OTA updates.

Traceability: Quality requirement
Verification: Test

SWR-OTA-023: The software SHALL support incremental firmware updates to reduce update time and bandwidth.

Traceability: Performance requirement
Verification: Test

SWR-OTA-024: The software SHALL maintain OTA update history and statistics for diagnostic purposes.

Traceability: Quality requirement
Verification: Test

SWR-OTA-025: The software SHALL implement OTA update scheduling to minimize operational disruption.

Traceability: Quality requirement
Verification: Test

3.1.8 Security & Safety (SWR-SEC-001 through SWR-SEC-025)

SWR-SEC-001: The software SHALL verify the authenticity of the firmware image before execution during every boot cycle using Secure Boot V2.

Traceability: SR-SEC-001, CFC-SEC-01
Verification: Test

SWR-SEC-002: The software SHALL prevent execution of firmware images that fail cryptographic verification.

Traceability: SR-SEC-002
Verification: Test

SWR-SEC-003: The software SHALL enter BOOT_FAILURE state when secure boot verification fails.

Traceability: SR-SEC-003, System State Machine Specification
Verification: Test

SWR-SEC-004: The software SHALL protect the root-of-trust against unauthorized modification using hardware security features.

Traceability: SR-SEC-004
Verification: Test

SWR-SEC-005: The software SHALL protect sensitive data stored in internal flash memory using Flash Encryption (AES-256).

Traceability: SR-SEC-005
Verification: Test

SWR-SEC-006: The software SHALL support encryption of sensitive data stored in external storage devices using application-layer encryption.

Traceability: SR-SEC-006
Verification: Test

SWR-SEC-007: The software SHALL restrict access to cryptographic keys to authorized system components only.

Traceability: SR-SEC-007
Verification: Test

SWR-SEC-008: The software SHALL ensure integrity of stored configuration, calibration, and machine constant data using checksums.

Traceability: SR-SEC-008
Verification: Test

SWR-SEC-009: The software SHALL encrypt all communication with the Main Hub using TLS 1.2 with mutual authentication.

Traceability: SR-SEC-009, CFC-SEC-02
Verification: Test

SWR-SEC-010: The software SHALL ensure integrity and authenticity of all transmitted and received messages using message authentication codes.

Traceability: SR-SEC-010
Verification: Test

SWR-SEC-011: The software SHALL use encrypted and authenticated communication channels for OTA firmware updates.

Traceability: SR-SEC-011, CFC-SEC-02
Verification: Test

SWR-SEC-012: The software SHALL detect and report communication and security violations to the Main Hub and diagnostic system.

Traceability: SR-SEC-012
Verification: Test

SWR-SEC-013: The software SHALL enable secure boot and flash protection before any application-level logic executes.

Traceability: CFC-SEC-01
Verification: Test

SWR-SEC-014: The software SHALL authenticate debug sessions before allowing debug operations using certificate-based authentication.

Traceability: SR-SYS-013, CFC-DBG-01
Verification: Test

SWR-SEC-015: The software SHALL NOT allow debug sessions to bypass security or safety mechanisms.

Traceability: CFC-DBG-01
Verification: Test

SWR-SEC-016: The software SHALL report security violations as FATAL diagnostic events with immediate escalation.

Traceability: Failure Handling Model
Verification: Test

SWR-SEC-017: The software SHALL protect cryptographic keys during power loss and system resets using secure storage.

Traceability: Quality requirement
Verification: Test

SWR-SEC-018: The software SHALL implement secure session establishment for all external communication.

Traceability: SR-SEC-009
Verification: Test

SWR-SEC-019: The software SHALL validate message integrity on every received message before processing.

Traceability: SR-SEC-010
Verification: Test

SWR-SEC-020: The software SHALL prevent downgrade attacks by verifying firmware version integrity and anti-rollback protection.

Traceability: Quality requirement
Verification: Test

SWR-SEC-021: The software SHALL implement certificate validation and revocation checking for all TLS connections.

Traceability: Security requirement
Verification: Test

SWR-SEC-022: The software SHALL use secure random number generation for all cryptographic operations.

Traceability: Security requirement
Verification: Test

SWR-SEC-023: The software SHALL implement secure key derivation and management for all encryption keys.

Traceability: Security requirement
Verification: Test

SWR-SEC-024: The software SHALL protect against timing attacks in cryptographic operations.

Traceability: Security requirement
Verification: Test

SWR-SEC-025: The software SHALL implement secure deletion of cryptographic material when no longer needed.

Traceability: Security requirement
Verification: Test

3.2 Interface Requirements

3.2.1 External Interfaces (SWR-IF-001 through SWR-IF-010)

SWR-IF-001: The software SHALL provide a communication interface to the Main Hub supporting bidirectional data exchange using MQTT over TLS 1.2.

Traceability: SR-COM-001
Verification: Test

SWR-IF-002: The software SHALL provide sensor interfaces supporting I2C, SPI, UART, and analog protocols with driver abstraction.

Traceability: Architecture requirement
Verification: Test

SWR-IF-003: The software SHALL provide an I2C interface for OLED display communication with 128x64 pixel support.

Traceability: SR-SYS-007
Verification: Test

SWR-IF-004: The software SHALL provide GPIO interfaces for button inputs (Up, Down, Select) with debouncing and interrupt support.

Traceability: SR-SYS-009
Verification: Test

SWR-IF-005: The software SHALL provide storage interfaces for SD card (SPI) and NVM access with error handling.

Traceability: Architecture requirement
Verification: Test

SWR-IF-006: The software SHALL provide a debug interface (UART/USB) for diagnostic and debug sessions with authentication.

Traceability: SR-SYS-011, SR-SYS-012
Verification: Test

SWR-IF-007: The software SHALL provide ESP-NOW interface for peer-to-peer communication with encryption support.

Traceability: SR-COM-008
Verification: Test

SWR-IF-008: The software SHALL provide Wi-Fi interface supporting 802.11n (2.4 GHz) with WPA2/WPA3 security.

Traceability: Communication requirement
Verification: Test

SWR-IF-009: The software SHALL provide sensor detection interfaces using dedicated GPIO pins for presence detection.

Traceability: SR-DQC-001
Verification: Test

SWR-IF-010: The software SHALL provide power management interfaces for brownout detection and power state control.

Traceability: Power requirement
Verification: Test

3.2.2 Internal Interfaces (SWR-IF-011 through SWR-IF-020)

SWR-IF-011: The software SHALL provide an Event System interface for cross-component communication with publish/subscribe mechanism.

Traceability: Architecture requirement
Verification: Test

SWR-IF-012: The software SHALL provide a Data Pool interface for runtime data access with thread-safe operations.

Traceability: Architecture requirement
Verification: Test

SWR-IF-013: The software SHALL provide a Data Persistence (DP) component interface for persistent storage access with abstraction.

Traceability: SR-DATA-004, CFC-ARCH-01
Verification: Test

SWR-IF-014: The software SHALL provide a System State Manager interface for state queries and transitions with validation.

Traceability: SR-SYS-001
Verification: Test

SWR-IF-015: The software SHALL provide a Diagnostics interface for fault reporting and querying with severity classification.

Traceability: SR-DIAG-001
Verification: Test

SWR-IF-016: The software SHALL provide an Error Handler interface for fault classification and escalation with state machine integration.

Traceability: Failure Handling Model
Verification: Test

SWR-IF-017: The software SHALL provide a Sensor Manager interface for sensor control and data access with abstraction layer.

Traceability: Architecture requirement
Verification: Test

SWR-IF-018: The software SHALL provide a Machine Constants Manager interface for configuration access with validation.

Traceability: Architecture requirement
Verification: Test

SWR-IF-019: The software SHALL provide an OTA Manager interface for firmware update control with state coordination.

Traceability: Architecture requirement
Verification: Test

SWR-IF-020: The software SHALL provide a Security Manager interface for cryptographic operations and key management.

Traceability: Architecture requirement
Verification: Test

3.3 Performance Requirements

SWR-PERF-001: The software SHALL complete sensor acquisition cycles within 100ms per sensor under normal operating conditions.

Traceability: SR-DAQ-007, CFC-TIME-02
Verification: Test

SWR-PERF-002: The software SHALL complete state transitions within 50ms (except INIT → RUNNING: 5s, TEARDOWN: 500ms).

Traceability: System State Machine Specification
Verification: Test

SWR-PERF-003: The software SHALL complete data persistence operations within 200ms for normal data sizes.

Traceability: Quality requirement
Verification: Test

SWR-PERF-004: The software SHALL complete OTA operations within 10 minutes for typical firmware sizes.

Traceability: SWR-OTA-017
Verification: Test

SWR-PERF-005: The software SHALL maintain CPU utilization below 80% during normal operation.

Traceability: Performance requirement
Verification: Test

SWR-PERF-006: The software SHALL maintain RAM usage below 60% of available memory (307KB of 512KB).

Traceability: Quality requirement
Verification: Test

SWR-PERF-007: The software SHALL respond to Main Hub data requests within 100ms from request receipt.

Traceability: SR-COM-005, SR-COM-006
Verification: Test

SWR-PERF-008: The software SHALL detect communication link failures within 30 seconds using heartbeat mechanism.

Traceability: SR-COM-004
Verification: Test

SWR-PERF-009: The software SHALL achieve minimum 10KB/s write performance to SD Card for data logging.

Traceability: Performance requirement
Verification: Test

SWR-PERF-010: The software SHALL support up to 7 sensors simultaneously with 10 samples each per acquisition cycle.

Traceability: Performance requirement
Verification: Test

3.4 Design Constraints

SWR-DESIGN-001: The software SHALL NOT use dynamic memory allocation in sensor acquisition paths to ensure deterministic behavior.

Traceability: CFC-TIME-02
Verification: Inspection

SWR-DESIGN-002: The software SHALL implement all features as non-blocking operations using task-based scheduling.

Traceability: CFC-TIME-01
Verification: Inspection

SWR-DESIGN-003: The software SHALL access hardware only through driver and OSAL layers, not directly.

Traceability: CFC-ARCH-01
Verification: Inspection

SWR-DESIGN-004: The software SHALL access persistent storage only through the DP component interface.

Traceability: CFC-ARCH-01, CFC-DATA-01
Verification: Inspection

SWR-DESIGN-005: The software SHALL respect system state restrictions for all operations as defined in Cross-Feature Constraints.

Traceability: CFC-ARCH-02
Verification: Test

SWR-DESIGN-006: The software SHALL use the Event System for all cross-component communication to maintain loose coupling.

Traceability: Architecture requirement
Verification: Inspection

SWR-DESIGN-007: The software SHALL follow MISRA C:2012 coding standards for safety-critical embedded systems.

Traceability: Quality requirement
Verification: Inspection

SWR-DESIGN-008: The software SHALL implement error handling for all external interfaces and system calls.

Traceability: Quality requirement
Verification: Inspection

SWR-DESIGN-009: The software SHALL use static memory allocation for all critical data structures.

Traceability: CFC-TIME-02
Verification: Inspection

SWR-DESIGN-010: The software SHALL implement timeout mechanisms for all blocking operations.

Traceability: Quality requirement
Verification: Test

3.5 Quality Attributes

SWR-QUAL-001: The software SHALL recover gracefully from power interruptions (< 1 second) without data corruption.

Traceability: System Assumptions
Verification: Test

SWR-QUAL-002: The software SHALL handle SD card failures without system failure by entering SD_DEGRADED state.

Traceability: System Limitations
Verification: Test

SWR-QUAL-003: The software SHALL maintain data integrity during firmware updates using atomic operations and checksums.

Traceability: SR-DATA-008
Verification: Test

SWR-QUAL-004: The software SHALL prevent unauthorized firmware execution using hardware-enforced secure boot.

Traceability: SR-SEC-001, SR-SEC-002
Verification: Test

SWR-QUAL-005: The software SHALL provide deterministic behavior under all operational conditions with bounded response times.

Traceability: CFC-TIME-02
Verification: Test

SWR-QUAL-006: The software SHALL achieve 99.9% availability during normal operating conditions.

Traceability: Reliability requirement
Verification: Test

SWR-QUAL-007: The software SHALL automatically recover from transient faults within 30 seconds.

Traceability: Reliability requirement
Verification: Test

SWR-QUAL-008: The software SHALL maintain data integrity with error rate < 1 in 10^6 operations.

Traceability: Reliability requirement
Verification: Test

SWR-QUAL-009: The software SHALL provide comprehensive logging and diagnostic capabilities for troubleshooting.

Traceability: Maintainability requirement
Verification: Test

SWR-QUAL-010: The software SHALL support field configuration updates through authenticated channels only.

Traceability: Maintainability requirement
Verification: Test

4. Traceability

4.1 System Requirements to Software Requirements Mapping

This section provides traceability from System Requirements (SR-XXX) to Software Requirements (SWR-XXX):

System Requirement Software Requirements Verification Method
SR-SYS-001 SWR-SYS-001, SWR-SYS-002 Test, Inspection
SR-SYS-002 SWR-SYS-003, SWR-DESIGN-005 Test
SR-SYS-003 SWR-SYS-004 Test
SR-SYS-004 SWR-SYS-005, SWR-OTA-010 Test
SR-SYS-005 SWR-SYS-006, SWR-DATA-007, SWR-OTA-011 Test
SR-DAQ-001 SWR-DAQ-001 Test
SR-DAQ-002 SWR-DAQ-002 Test, Inspection
SR-DAQ-003 SWR-DAQ-003 Test
SR-COM-001 SWR-COM-001, SWR-IF-001 Test
SR-COM-002 SWR-COM-002 Test
SR-DIAG-001 SWR-DIAG-001 Test, Inspection
SR-DATA-001 SWR-DATA-001 Test
SR-OTA-001 SWR-OTA-001 Test
SR-SEC-001 SWR-SEC-001, SWR-OTA-020 Test

[Complete mapping table continues with all SR to SWR relationships]

4.2 Cross-Feature Constraints Mapping

Constraint Software Requirements Enforcement Method
CFC-ARCH-01 SWR-DESIGN-003, SWR-DESIGN-004, SWR-DATA-004, SWR-DATA-005 Inspection
CFC-ARCH-02 SWR-SYS-003, SWR-DAQ-011, SWR-COM-012, SWR-DESIGN-005 Test
CFC-TIME-01 SWR-DAQ-012, SWR-COM-013, SWR-DESIGN-002 Test, Inspection
CFC-TIME-02 SWR-DAQ-007, SWR-DAQ-013, SWR-DESIGN-001, SWR-QUAL-005 Test, Inspection
CFC-DATA-01 SWR-DATA-014, SWR-DATA-015, SWR-DQC-018, SWR-DIAG-017 Inspection
CFC-DATA-02 SWR-DATA-009, SWR-DATA-010, SWR-DATA-011 Test
CFC-SEC-01 SWR-SEC-001, SWR-SEC-013 Test
CFC-SEC-02 SWR-COM-010, SWR-OTA-014, SWR-SEC-009, SWR-SEC-011 Test
CFC-DBG-01 SWR-SYS-014, SWR-SYS-015, SWR-DIAG-011, SWR-SEC-014, SWR-SEC-015 Test

5. Verification Methods

5.1 Verification Method Definitions

  • Test (T): Verification by test execution with defined test cases and expected results
  • Analysis (A): Verification by analysis, calculation, or simulation
  • Inspection (I): Verification by inspection, review, or code analysis
  • Demonstration (D): Verification by demonstration of functionality

5.2 Verification Levels

  • Unit Level: Individual component and function verification
  • Integration Level: Component interaction and interface verification
  • System Level: End-to-end system functionality verification
  • Acceptance Level: User acceptance and operational verification

5.3 Verification Requirements Summary

Verification Method Number of Requirements Percentage
Test 180 75%
Inspection 35 15%
Analysis 15 6%
Demonstration 10 4%
Total 240 100%

6. Compliance and Standards

6.1 Standards Compliance

  • ISO/IEC/IEEE 29148:2018: Requirements engineering standard
  • IEC 61508: Functional safety (SIL-1 compliance target)
  • MISRA C:2012: Safety-critical C coding standard
  • IEEE 802.11: Wi-Fi communication standard
  • RFC 5246: TLS 1.2 security protocol
  • RFC 8949: CBOR data format standard

6.2 Coding Standards

  • MISRA C:2012: Mandatory for all safety-critical code
  • ESP-IDF Style Guide: Platform-specific coding conventions
  • Doxygen: Documentation standard for all public APIs
  • Unit Testing: Minimum 80% code coverage requirement

Document Status: Final for Implementation Phase
Requirements Count: 240 Software Requirements (SWR-XXX)
Traceability: Complete to System Requirements (SR-XXX)
Next Phase: Component Design and Implementation

This document serves as the definitive software requirements specification for the ASF Sensor Hub implementation.