docs: Update TODO.md with comprehensive V2G message implementation roadmap
- Remove completed/obsolete tasks from previous C# porting plan - Add detailed roadmap for implementing 11 core V2G message types - Prioritize DC charging essential messages (Phase 1: CableCheck, PreCharge, WeldingDetection, PowerDelivery) - Define implementation order: C → VC2022 → dotnet for consistency - Include infrastructure improvements and success metrics - Focus on XML parsing/generation as primary gap Next immediate step: CableCheckReq/Res implementation in C 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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# V2GDecoderC C# Porting Task List
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# V2G EXI Decoder - Development Roadmap
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## 📋 Execution Plan
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## 📋 Current Status & Next Steps
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### Phase 1: Setup & Analysis ✅
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### ✅ Completed Tasks
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- [x] Create REPORT.md with comprehensive C code analysis
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- [x] Clean output implementation for VC2022 -decode/-encode options
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- [x] Create TODO.md with execution plan
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- [x] Usage message standardization across versions
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- [x] DEBUG_PRINTF macro implementation for conditional debug output
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- [x] Comprehensive message implementation status analysis
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- [x] Documentation of current capabilities and gaps
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- [x] Multi-platform build verification (C, VC2022, dotnet)
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### Phase 2: .NET Core/6+ Implementation
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### 🎯 Next Priority: V2G Message Implementation
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- [ ] Create `csharp` folder structure
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- [ ] Create `csharp\dotnet` subfolder
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- [ ] Port core EXI codec to .NET
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- [ ] Port V2G protocol implementations (ISO1, ISO2, DIN)
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- [ ] Create test harness for .NET version
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- [ ] Test with test1.exi → test1.xml → test1.exi roundtrip
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- [ ] Validate roundtrip integrity (original vs final)
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- [ ] **Git commit** .NET version
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### Phase 3: .NET Framework 4.8 Implementation
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#### Phase 1: DC Charging Core Messages (Highest Priority)
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- [ ] Create `csharp\dotnetfx` subfolder
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Implementation order: C → VC2022 → dotnet
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- [ ] Port .NET version to .NET Framework 4.8
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- [ ] Adjust for Framework-specific differences
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- [ ] Create test harness for .NET FX version
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- [ ] Test with test1.exi → test1.xml → test1.exi roundtrip
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- [ ] Validate roundtrip integrity (original vs final)
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- [ ] **Git commit** .NET Framework version
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### Testing Strategy
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1. **CableCheckReq/Res** - Cable insulation state verification
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```
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- [ ] C: XML parsing/generation logic
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Original: test1.exi
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- [ ] C: EXI encoding/decoding integration
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Step 1: Decode test1.exi → test1.xml
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- [ ] VC2022: Port from C implementation
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Step 2: Encode test1.xml → test1_new.exi
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- [ ] dotnet: Port from C implementation
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Step 3: Binary compare test1.exi ≟ test1_new.exi
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- [ ] Test with sample EXI files
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Result: PASS/FAIL validation
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```
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### Key Porting Considerations
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2. **PreChargeReq/Res** - Pre-charging voltage matching
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- **Memory Management**: C static allocation → C# managed memory
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- [ ] C: XML parsing/generation logic
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- **Error Handling**: C return codes → C# exceptions
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- [ ] C: EXI encoding/decoding integration
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- **String Handling**: C char arrays → C# string/byte[]
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- [ ] VC2022: Port from C implementation
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- **Buffer Operations**: C memcpy → C# Array.Copy/Buffer.BlockCopy
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- [ ] dotnet: Port from C implementation
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- **Platform Differences**: Endianness, type sizes
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- [ ] Test with sample EXI files
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- **Security**: Address C vulnerabilities in C# implementation
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### Success Criteria
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3. **WeldingDetectionReq/Res** - Post-charging welding detection
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1. ✅ Functional parity with C version
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- [ ] C: XML parsing/generation logic
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2. ✅ Test roundtrip validation passes
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- [ ] C: EXI encoding/decoding integration
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3. ✅ Clean separation of .NET/.NET FX versions
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- [ ] VC2022: Port from C implementation
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4. ✅ Git commits for each major milestone
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- [ ] dotnet: Port from C implementation
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5. ✅ Improved memory safety vs C version
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- [ ] Test with sample EXI files
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4. **PowerDeliveryReq/Res** - Charging start/stop control
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- [ ] C: XML parsing/generation logic
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- [ ] C: EXI encoding/decoding integration
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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- [ ] Test with sample EXI files
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#### Phase 2: Session & Service Management (High Priority)
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5. **SessionSetupReq/Res** - Charging session initialization
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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6. **ServiceDiscoveryReq/Res** - Available charging services discovery
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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7. **AuthorizationReq/Res** - Charging authorization verification
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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8. **ChargeParameterDiscoveryReq/Res** - Charging parameter exchange
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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#### Phase 3: Extended Features (Medium Priority)
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9. **PaymentServiceSelectionReq/Res** - Payment method selection
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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10. **ChargingStatusReq/Res** - AC charging status (for AC support)
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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11. **SessionStopReq/Res** - Charging session termination
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- [ ] C: XML parsing/generation logic
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- [ ] VC2022: Port from C implementation
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- [ ] dotnet: Port from C implementation
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### 🔧 Infrastructure Improvements
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#### Code Quality & Testing
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- [ ] Implement comprehensive test suite for all message types
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- [ ] Create sample EXI files for each message type
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- [ ] Add roundtrip testing (EXI → XML → EXI validation)
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- [ ] Performance benchmarking across versions
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#### Build & Deployment
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- [ ] Automate build process for all platforms
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- [ ] Create release packaging scripts
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- [ ] Add continuous integration pipeline
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#### Documentation
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- [ ] Create API documentation for each version
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- [ ] Write usage examples for each message type
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- [ ] Document ISO 15118-2 compliance status
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### 📊 Success Metrics
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#### Functional Requirements
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- [ ] Support all 8 core DC charging messages
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- [ ] Pass ISO 15118-2 compliance validation
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- [ ] Maintain backward compatibility with existing CurrentDemand implementation
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- [ ] Clean output for production use (no debug messages)
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#### Quality Requirements
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- [ ] 100% roundtrip accuracy (EXI → XML → EXI)
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- [ ] Memory safety (no buffer overflows)
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- [ ] Performance parity with original C implementation
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- [ ] Consistent behavior across C/VC2022/dotnet versions
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### 🎯 Current Focus
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**Immediate Next Step**: Implement CableCheckReq/Res in original C version as foundation for other platform ports.
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### 📝 Notes
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- All message structures already exist in VC2022 and dotnet versions
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- Focus on XML parsing/generation logic implementation
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- Maintain DEBUG_PRINTF pattern for consistent debugging
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- Test each message with real V2G communication scenarios
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