# Software Interface Traceability
# ASF Sensor Hub Interface Mapping

**Document Type:** Interface Traceability Documentation  
**Version:** 1.0  
**Date:** 2025-01-19  

## Overview

This document provides complete traceability mapping for all software interfaces in the ASF Sensor Hub system, showing relationships between interfaces, their component providers, software features, and system requirements.

## Interface Categories

### API Interfaces
Public programming interfaces provided by components for other components to use.

### Event Interfaces
Event-based communication interfaces using the publish/subscribe pattern.

### Hardware Interfaces
Low-level hardware abstraction interfaces for peripheral access.

### Communication Interfaces
Network and protocol interfaces for external communication.

### Utility Interfaces
Cross-cutting utility interfaces used by multiple components.

## Interface Details

### Core System Interfaces

#### State Manager Interface
**Provider Component:** State Manager (`application_layer/business_stack/STM/`)
**Interface Type:** API
**Software Features:** F-SYS, F-OTA, F-PWR
**System Requirements:** SR-SYS-001, SR-SYS-002, SR-SYS-003

**Public Functions:**
```c
system_state_t stm_getCurrentState(void);
bool stm_isStateValid(system_state_t state);
bool stm_requestTransition(system_state_t target_state, transition_reason_t reason);
bool stm_validateTransition(system_state_t from, system_state_t to);
bool stm_initiateTeardown(teardown_reason_t reason);
bool stm_isTeardownComplete(void);
bool stm_registerStateListener(state_listener_t listener);
```

**Used By:** All components requiring state awareness
**Communication Pattern:** Synchronous API calls
**Data Types:** `system_state_t`, `transition_reason_t`, `state_listener_t`

#### Event System Interface
**Provider Component:** Event System (`application_layer/business_stack/event_system/`)
**Interface Type:** Event Bus
**Software Features:** F-SYS, F-DAQ, F-COM, F-DIAG
**System Requirements:** SR-SYS-002, SR-COM-005

**Public Functions:**
```c
bool event_publish(event_type_t type, void* payload, size_t payload_size);
bool event_subscribe(event_type_t type, event_handler_t handler);
bool event_unsubscribe(event_type_t type, event_handler_t handler);
```

**Used By:** All components for inter-component communication
**Communication Pattern:** Asynchronous publish/subscribe
**Data Types:** `event_type_t`, `event_handler_t`

### Sensor Management Interfaces

#### Sensor Manager Interface
**Provider Component:** Sensor Manager (`application_layer/business_stack/sensor_manager/`)
**Interface Type:** API
**Software Features:** F-DAQ, F-DQC
**System Requirements:** SR-DAQ-001, SR-DAQ-002, SR-DAQ-003, SR-DAQ-004, SR-DAQ-005

**Public Functions:**
```c
bool sensorMgr_initialize(void);
bool sensorMgr_loadConfiguration(const machine_constants_t* mc);
bool sensorMgr_detectSensors(void);
bool sensorMgr_startAcquisition(void);
bool sensorMgr_stopAcquisition(void);
bool sensorMgr_enableSensor(uint8_t sensor_id);
bool sensorMgr_disableSensor(uint8_t sensor_id);
bool sensorMgr_getLatestData(uint8_t sensor_id, sensor_data_record_t* record);
bool sensorMgr_getAllSensorData(sensor_data_record_t* records, size_t* count);
sensor_state_t sensorMgr_getSensorState(uint8_t sensor_id);
```

**Used By:** Data Pool, Main Hub APIs, Diagnostics
**Communication Pattern:** Synchronous API calls
**Data Types:** `sensor_data_record_t`, `sensor_state_t`, `machine_constants_t`

#### Sensor Abstraction Layer Interface
**Provider Component:** Sensor Abstraction Layer (`drivers/sensor_abstraction/`)
**Interface Type:** Hardware Abstraction
**Software Features:** F-HW, F-DAQ
**System Requirements:** SR-HW-001, SR-HW-002

**Public Functions:**
```c
bool sal_initializeSensor(uint8_t sensor_id);
bool sal_enableSensor(uint8_t sensor_id);
bool sal_disableSensor(uint8_t sensor_id);
bool sal_readSensor(uint8_t sensor_id, float* value);
bool sal_calibrateSensor(uint8_t sensor_id, const calibration_data_t* cal_data);
bool sal_validateReading(uint8_t sensor_id, float value);
bool sal_performHealthCheck(uint8_t sensor_id);
bool sal_getSensorMetadata(uint8_t sensor_id, sensor_metadata_t* metadata);
sensor_state_t sal_getSensorState(uint8_t sensor_id);
```

**Used By:** Sensor Manager
**Communication Pattern:** Synchronous API calls
**Data Types:** `sensor_metadata_t`, `calibration_data_t`

### Data Management Interfaces

#### Data Pool Interface
**Provider Component:** Data Pool (`application_layer/DP_stack/data_pool/`)
**Interface Type:** API
**Software Features:** F-DATA, F-DAQ, F-COM
**System Requirements:** SR-DATA-002, SR-PERF-003

**Public Functions:**
```c
bool dataPool_initialize(void);
bool dataPool_updateSensorData(uint8_t sensor_id, const sensor_data_record_t* record);
bool dataPool_getLatestData(uint8_t sensor_id, sensor_data_record_t* record);
bool dataPool_getAllSensorData(sensor_data_record_t* records, size_t* count);
bool dataPool_getSystemState(system_state_t* state);
bool dataPool_updateSystemState(system_state_t state);
```

**Used By:** Main Hub APIs, Persistence, Diagnostics
**Communication Pattern:** Synchronous API calls
**Data Types:** `sensor_data_record_t`, `system_state_t`

#### Persistence Interface
**Provider Component:** Persistence (`application_layer/DP_stack/persistence/`)
**Interface Type:** API
**Software Features:** F-DATA, F-DIAG, F-DQC, F-OTA
**System Requirements:** SR-DATA-001, SR-DATA-002, SR-DATA-003, SR-DATA-004, SR-DATA-005

**Public Functions:**
```c
bool persistence_writeSensorData(const sensor_data_record_t* record);
bool persistence_writeDiagnostic(const diagnostic_event_t* event);
bool persistence_writeMachineConstants(const machine_constants_t* mc);
bool persistence_readSensorData(sensor_data_record_t* records, size_t* count);
bool persistence_readDiagnostics(diagnostic_event_t* events, size_t* count);
bool persistence_readMachineConstants(machine_constants_t* mc);
bool persistence_flushCriticalData(void);
bool persistence_isFlushComplete(void);
```

**Used By:** All components requiring persistent storage
**Communication Pattern:** Synchronous API calls
**Data Types:** `sensor_data_record_t`, `diagnostic_event_t`, `machine_constants_t`

### Communication Interfaces

#### Main Hub APIs Interface
**Provider Component:** Main Hub APIs (`application_layer/business_stack/main_hub_apis/`)
**Interface Type:** Communication Protocol
**Software Features:** F-COM
**System Requirements:** SR-COM-001, SR-COM-002, SR-COM-003

**Public Functions:**
```c
bool mainHubAPI_initialize(void);
bool mainHubAPI_connect(const char* hub_address);
bool mainHubAPI_sendSensorData(const sensor_data_record_t* records, size_t count);
bool mainHubAPI_sendDiagnosticData(const diagnostic_event_t* events, size_t count);
bool mainHubAPI_handleRequest(const main_hub_request_t* request);
bool mainHubAPI_getConnectionStatus(connection_status_t* status);
bool mainHubAPI_disconnect(void);
```

**Used By:** Event System (for data transmission triggers)
**Communication Pattern:** Asynchronous network communication
**Data Types:** `main_hub_request_t`, `connection_status_t`

#### Network Stack Interface
**Provider Component:** Network Stack (`drivers/network_stack/`)
**Interface Type:** Network Protocol
**Software Features:** F-COM, F-SEC, F-OTA
**System Requirements:** SR-COM-002, SR-COM-004, SR-COM-005

**Public Functions:**
```c
bool networkStack_initialize(void);
bool networkStack_connect(const char* ssid, const char* password);
bool networkStack_disconnect(void);
bool networkStack_sendData(const uint8_t* data, size_t size);
bool networkStack_receiveData(uint8_t* buffer, size_t* size);
bool networkStack_setupTLS(const tls_config_t* config);
bool networkStack_getStatus(network_status_t* status);
```

**Used By:** Main Hub APIs, OTA Manager
**Communication Pattern:** Asynchronous network I/O
**Data Types:** `tls_config_t`, `network_status_t`

### Diagnostic Interfaces

#### Diagnostics Task Interface
**Provider Component:** Diagnostics Task (`application_layer/diag_task/`)
**Interface Type:** API
**Software Features:** F-DIAG
**System Requirements:** SR-DIAG-001, SR-DIAG-002, SR-DIAG-003, SR-DIAG-004

**Public Functions:**
```c
bool diagTask_initialize(void);
bool diagTask_start(void);
bool diagTask_stop(void);
bool diagTask_reportEvent(const diagnostic_event_t* event);
bool diagTask_getEvents(const diagnostic_filter_t* filter, 
                       diagnostic_event_t* events, size_t* count);
bool diagTask_clearEvents(const diagnostic_filter_t* filter);
bool diagTask_getSystemHealth(system_health_t* health);
session_id_t diagTask_createSession(session_type_t type);
bool diagTask_authenticateSession(session_id_t session, const auth_credentials_t* creds);
```

**Used By:** Error Handler, Engineering Tools
**Communication Pattern:** Synchronous API calls
**Data Types:** `diagnostic_event_t`, `diagnostic_filter_t`, `system_health_t`

#### Error Handler Interface
**Provider Component:** Error Handler (`application_layer/error_handler/`)
**Interface Type:** API
**Software Features:** F-PWR, F-DIAG, F-SYS
**System Requirements:** SR-PWR-003, SR-PWR-004, SR-DIAG-001

**Public Functions:**
```c
bool errorHandler_reportError(component_id_t source, error_code_t code, 
                             const char* description, const uint8_t* context_data);
bool errorHandler_reportWarning(component_id_t source, warning_code_t code, 
                               const char* description);
bool errorHandler_reportInfo(component_id_t source, info_code_t code, 
                            const char* description);
diagnostic_severity_t errorHandler_classifyError(error_code_t code);
bool errorHandler_getErrorStatistics(error_statistics_t* stats);
```

**Used By:** All components for error reporting
**Communication Pattern:** Synchronous API calls
**Data Types:** `error_code_t`, `diagnostic_severity_t`, `error_statistics_t`

### Hardware Abstraction Interfaces

#### GPIO Manager Interface
**Provider Component:** GPIO Manager (`drivers/gpio_manager/`)
**Interface Type:** Hardware Abstraction
**Software Features:** F-HW
**System Requirements:** SR-HW-002, SR-HW-003

**Public Functions:**
```c
bool gpioMgr_initialize(void);
bool gpioMgr_reservePin(uint8_t gpio_num, gpio_function_t function, 
                       const char* component_name);
bool gpioMgr_releasePin(uint8_t gpio_num);
bool gpioMgr_configurePin(uint8_t gpio_num, const gpio_config_t* config);
bool gpioMgr_validateGPIOMap(void);
bool gpioMgr_detectConflicts(gpio_conflict_t* conflicts, size_t* count);
```

**Used By:** All components requiring GPIO access
**Communication Pattern:** Synchronous API calls
**Data Types:** `gpio_function_t`, `gpio_config_t`, `gpio_conflict_t`

#### I2C Wrapper Interface
**Provider Component:** I2C Wrapper (`ESP_IDF_FW_wrappers/i2c/`)
**Interface Type:** Hardware Interface
**Software Features:** F-HW, F-DAQ
**System Requirements:** SR-HW-002

**Public Functions:**
```c
bool hw_i2c_initialize(uint8_t port, const i2c_config_t* config);
bool hw_i2c_write(uint8_t port, uint8_t device_addr, const uint8_t* data, size_t len);
bool hw_i2c_read(uint8_t port, uint8_t device_addr, uint8_t* data, size_t len);
bool hw_i2c_write_read(uint8_t port, uint8_t device_addr, 
                      const uint8_t* write_data, size_t write_len,
                      uint8_t* read_data, size_t read_len);
bool hw_i2c_scan_devices(uint8_t port, uint8_t* found_devices, size_t* count);
```

**Used By:** Sensor Drivers, OLED Driver
**Communication Pattern:** Synchronous hardware I/O
**Data Types:** `i2c_config_t`

### Security Interfaces

#### Security Manager Interface
**Provider Component:** Security Manager (`application_layer/security/`)
**Interface Type:** API
**Software Features:** F-SEC
**System Requirements:** SR-SEC-001, SR-SEC-002, SR-SEC-003, SR-SEC-004

**Public Functions:**
```c
bool secMgr_initialize(void);
bool secMgr_isSecurityEnabled(void);
security_status_t secMgr_getSecurityStatus(void);
bool secMgr_reportViolation(security_violation_type_t type, 
                           const char* source, const uint8_t* context);
bool secMgr_setSecurityPolicy(const security_policy_t* policy);
bool secMgr_enforceSecurityPolicy(void);
```

**Used By:** All components for security enforcement
**Communication Pattern:** Synchronous API calls
**Data Types:** `security_violation_type_t`, `security_policy_t`, `security_status_t`

#### Encryption Engine Interface
**Provider Component:** Encryption Engine (`application_layer/security/crypto/`)
**Interface Type:** API
**Software Features:** F-SEC
**System Requirements:** SR-SEC-002, SR-SEC-003

**Public Functions:**
```c
bool crypto_encrypt(const uint8_t* plaintext, size_t plaintext_len,
                   const uint8_t* key, uint8_t* ciphertext, size_t* ciphertext_len);
bool crypto_decrypt(const uint8_t* ciphertext, size_t ciphertext_len,
                   const uint8_t* key, uint8_t* plaintext, size_t* plaintext_len);
bool crypto_sha256(const uint8_t* data, size_t data_len, uint8_t* hash);
bool crypto_generateKey(key_type_t type, uint8_t* key, size_t key_len);
```

**Used By:** Security Manager, OTA Manager, Persistence
**Communication Pattern:** Synchronous cryptographic operations
**Data Types:** `key_type_t`

### Utility Interfaces

#### Logger Interface
**Provider Component:** Logger (`utils/logger/`)
**Interface Type:** Utility
**Software Features:** All Features (cross-cutting)
**System Requirements:** SR-DIAG-002

**Public Functions:**
```c
bool logger_initialize(void);
void logger_log(log_level_t level, const char* tag, const char* format, ...);
bool logger_setLevel(log_level_t level);
bool logger_flush(void);
bool logger_setOutput(log_output_t output);
```

**Used By:** All components for debug logging
**Communication Pattern:** Synchronous logging calls
**Data Types:** `log_level_t`, `log_output_t`

#### Time Utils Interface
**Provider Component:** Time Utils (`utils/time_utils/`)
**Interface Type:** Utility
**Software Features:** F-DAQ, F-DIAG
**System Requirements:** SR-DAQ-004

**Public Functions:**
```c
bool timeUtils_initialize(void);
uint64_t timeUtils_getCurrentTimestamp(void);
bool timeUtils_formatTimestamp(uint64_t timestamp, char* buffer, size_t size);
bool timeUtils_setSystemTime(uint64_t timestamp);
bool timeUtils_getSystemTime(uint64_t* timestamp);
```

**Used By:** Sensor Manager, Diagnostics Task
**Communication Pattern:** Synchronous utility calls
**Data Types:** `uint64_t` (timestamp)

## Interface Usage Matrix

| Interface | Provider Component | Primary Users | Software Features | System Requirements |
|-----------|-------------------|---------------|-------------------|-------------------|
| State Manager API | State Manager | All Components | F-SYS, F-OTA, F-PWR | SR-SYS-001, SR-SYS-002, SR-SYS-003 |
| Event System | Event System | All Components | F-SYS, F-DAQ, F-COM, F-DIAG | SR-SYS-002, SR-COM-005 |
| Sensor Manager API | Sensor Manager | Data Pool, Main Hub APIs | F-DAQ, F-DQC | SR-DAQ-001 to SR-DAQ-005 |
| Data Pool API | Data Pool | Main Hub APIs, Persistence | F-DATA, F-DAQ, F-COM | SR-DATA-002, SR-PERF-003 |
| Persistence API | Persistence | All Data Producers | F-DATA, F-DIAG, F-DQC, F-OTA | SR-DATA-001 to SR-DATA-005 |
| Main Hub APIs | Main Hub APIs | Event System | F-COM | SR-COM-001, SR-COM-002, SR-COM-003 |
| Network Stack | Network Stack | Main Hub APIs, OTA Manager | F-COM, F-SEC, F-OTA | SR-COM-002, SR-COM-004, SR-COM-005 |
| Diagnostics API | Diagnostics Task | Error Handler, Engineering Tools | F-DIAG | SR-DIAG-001 to SR-DIAG-004 |
| Error Handler API | Error Handler | All Components | F-PWR, F-DIAG, F-SYS | SR-PWR-003, SR-PWR-004, SR-DIAG-001 |
| Security Manager API | Security Manager | All Components | F-SEC | SR-SEC-001 to SR-SEC-004 |
| Hardware Interfaces | ESP-IDF Wrappers | Sensor Drivers, Hardware Managers | F-HW, F-DAQ | SR-HW-002 |
| Logger | Logger | All Components | All Features | SR-DIAG-002 |
| Time Utils | Time Utils | Sensor Manager, Diagnostics | F-DAQ, F-DIAG | SR-DAQ-004 |

## Interface Communication Patterns

### Synchronous API Calls
- **Pattern:** Direct function calls with immediate return
- **Used By:** Most component APIs
- **Characteristics:** Blocking, immediate response, error handling via return codes

### Asynchronous Event Communication
- **Pattern:** Publish/subscribe with event queues
- **Used By:** Event System, cross-component notifications
- **Characteristics:** Non-blocking, decoupled, eventual consistency

### Hardware I/O Operations
- **Pattern:** Synchronous hardware transactions with timeouts
- **Used By:** Hardware wrapper interfaces
- **Characteristics:** Bounded timing, error detection, resource management

### Network Communication
- **Pattern:** Asynchronous network I/O with callbacks
- **Used By:** Network Stack, Main Hub APIs
- **Characteristics:** Non-blocking, connection management, protocol handling

## Interface Testing Strategy

### Unit Testing
- **Mock Interfaces:** Create mock implementations for isolated testing
- **Contract Testing:** Validate interface contracts and data types
- **Error Handling:** Test error conditions and edge cases

### Integration Testing
- **Interface Compatibility:** Test interface interactions between components
- **Data Flow:** Validate data flow through interface chains
- **Performance:** Test interface performance under load

### System Testing
- **End-to-End:** Test complete interface usage scenarios
- **Fault Injection:** Test interface behavior under failure conditions
- **Security:** Validate security aspects of interfaces

---

**Document Status:** Complete and Validated  
**Last Updated:** 2025-01-19  
**Next Review:** After interface implementation begins