130 lines
4.2 KiB
Markdown
130 lines
4.2 KiB
Markdown
# Engineering Review Report
|
|
|
|
## A. Executive Summary
|
|
|
|
### Overall System Maturity Level
|
|
The ASF Sensor Hub demonstrates a well-structured architecture with clear layering, defined responsibilities, and adherence to embedded system constraints. However, several critical gaps and risks need to be addressed before proceeding to the implementation phase.
|
|
|
|
### Major Risks (Top 5)
|
|
1. **Cross-Feature Conflicts**: Potential timing conflicts between OTA updates and DAQ operations.
|
|
2. **State Machine Completeness**: Undefined transitions for error handling and degraded states.
|
|
3. **Data Integrity Risks**: Insufficient guarantees for data persistence during power loss.
|
|
4. **Security Gaps**: Lack of detailed secure boot and cryptographic key management mechanisms.
|
|
5. **Scalability Concerns**: Limited provisions for adding new sensor types or features.
|
|
|
|
### Go / No-Go Recommendation
|
|
**No-Go**: Address the identified critical risks and gaps before proceeding to the implementation phase.
|
|
|
|
---
|
|
|
|
## B. Detailed Findings
|
|
|
|
### 1. Architecture
|
|
|
|
#### Findings:
|
|
- **Layering & Separation of Concerns**: Proper abstraction boundaries are defined, but direct hardware access by features bypassing the System Manager is a risk. **Severity: Major**
|
|
- **State Machine Validity**: Some states (e.g., ERROR, DEGRADED) lack defined transitions and behaviors. **Severity: Critical**
|
|
|
|
#### Recommendations:
|
|
- Enforce strict access controls to hardware and persistence layers.
|
|
- Define and document all state transitions and behaviors.
|
|
|
|
### 2. Requirements
|
|
|
|
#### Findings:
|
|
- **Missing Requirements**: No explicit requirements for handling SD card wear or power loss scenarios. **Severity: Critical**
|
|
- **Conflicting Requirements**: OTA updates may interfere with real-time DAQ operations. **Severity: Major**
|
|
|
|
#### Recommendations:
|
|
- Add requirements for wear leveling and power loss recovery.
|
|
- Define OTA timing constraints to avoid conflicts.
|
|
|
|
### 3. Performance
|
|
|
|
#### Findings:
|
|
- **Memory Usage Risks**: High-frequency sampling and local filtering may exceed ESP32-S3 memory limits. **Severity: Major**
|
|
|
|
#### Recommendations:
|
|
- Optimize memory usage by profiling and limiting buffer sizes.
|
|
|
|
### 4. Reliability
|
|
|
|
#### Findings:
|
|
- **Fault Tolerance**: No defined behavior for sensor failures during runtime. **Severity: Major**
|
|
|
|
#### Recommendations:
|
|
- Implement fallback mechanisms for failed sensors.
|
|
|
|
### 5. Security
|
|
|
|
#### Findings:
|
|
- **Secure Boot**: No detailed mechanism for secure boot and firmware authenticity verification. **Severity: Critical**
|
|
|
|
#### Recommendations:
|
|
- Implement secure boot and cryptographic verification for firmware.
|
|
|
|
### 6. Maintainability
|
|
|
|
#### Findings:
|
|
- **Scalability**: Adding new sensors requires significant manual effort. **Severity: Minor**
|
|
|
|
#### Recommendations:
|
|
- Use a modular approach for sensor integration.
|
|
|
|
---
|
|
|
|
## C. Missing / Risky Areas
|
|
|
|
### Missing System Requirements
|
|
- SD card wear leveling.
|
|
- Power loss recovery mechanisms.
|
|
|
|
### Missing System States
|
|
- Detailed ERROR and DEGRADED state transitions.
|
|
|
|
### Missing Failure Handling
|
|
- Sensor failure fallback mechanisms.
|
|
|
|
### Missing Documentation
|
|
- Secure boot and cryptographic key management.
|
|
|
|
---
|
|
|
|
## D. Improvement Recommendations
|
|
|
|
1. **Architectural Enhancements**:
|
|
- Enforce strict abstraction boundaries.
|
|
- Define all state transitions and behaviors.
|
|
|
|
2. **Requirement Additions**:
|
|
- Add requirements for SD card wear leveling and power loss recovery.
|
|
|
|
3. **Security Improvements**:
|
|
- Implement secure boot and cryptographic verification mechanisms.
|
|
|
|
4. **Scalability Enhancements**:
|
|
- Adopt a modular approach for sensor integration.
|
|
|
|
---
|
|
|
|
## E. Generated Artifacts
|
|
|
|
### State Machine Diagram
|
|
```mermaid
|
|
graph TD
|
|
INIT --> IDLE
|
|
IDLE --> RUNNING
|
|
RUNNING --> DEGRADED
|
|
RUNNING --> ERROR
|
|
DEGRADED --> TEARDOWN
|
|
ERROR --> TEARDOWN
|
|
TEARDOWN --> INIT
|
|
```
|
|
|
|
### Cross-Feature Conflict Table
|
|
| Feature A | Feature B | Conflict Description | Resolution Recommendation |
|
|
|-----------------|-----------------|-------------------------------|----------------------------------|
|
|
| OTA | DAQ | Timing conflicts | Define OTA timing constraints |
|
|
| Persistence | Power Loss | Data corruption risks | Add wear leveling and recovery |
|
|
|
|
--- |