V2GDecoderC/TODO.md

V2G EXI Decoder - Development Roadmap

📋 Current Status & Next Steps

✅ Completed Tasks

• Clean output implementation for VC2022 -decode/-encode options
• Usage message standardization across versions
• DEBUG_PRINTF macro implementation for conditional debug output
• Comprehensive message implementation status analysis
• Documentation of current capabilities and gaps
• Multi-platform build verification (C, VC2022, dotnet)

🎯 Next Priority: V2G Message Implementation

Phase 1: DC Charging Core Messages (Highest Priority) ✅ COMPLETED

Implementation order: C → VC2022 → dotnet

1. CableCheckReq/Res - Cable insulation state verification ✅

   • C: XML parsing/generation logic
   • C: EXI encoding/decoding integration
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation
   • Test with sample EXI files

2. PreChargeReq/Res - Pre-charging voltage matching ✅

   • C: XML parsing/generation logic
   • C: EXI encoding/decoding integration
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation
   • Test with sample EXI files

3. WeldingDetectionReq/Res - Post-charging welding detection ✅

   • C: XML parsing/generation logic
   • C: EXI encoding/decoding integration
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation
   • Test with sample EXI files

4. PowerDeliveryReq/Res - Charging start/stop control ✅

   • C: XML parsing/generation logic
   • C: EXI encoding/decoding integration
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation
   • Test with sample EXI files

Phase 2: Session & Service Management (High Priority) ✅ COMPLETED

5. SessionSetupReq/Res - Charging session initialization ✅

   • C: XML parsing/generation logic
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation

6. ServiceDiscoveryReq/Res - Available charging services discovery ✅

   • C: XML parsing/generation logic
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation

7. AuthorizationReq/Res - Charging authorization verification ✅

   • C: XML parsing/generation logic
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation

8. ChargeParameterDiscoveryReq/Res - Charging parameter exchange ✅

   • C: XML parsing/generation logic
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation

Phase 3: Extended Features (Medium Priority) ✅ COMPLETED

9. PaymentServiceSelectionReq/Res - Payment method selection ✅

   • C: XML parsing/generation logic
   • VC2022: Port from C implementation
   • dotnet: Port from C implementation

10. ChargingStatusReq/Res - AC charging status (for AC support) ✅

    • C: XML parsing/generation logic
    • VC2022: Port from C implementation
    • dotnet: Port from C implementation

11. SessionStopReq/Res - Charging session termination ✅

    • C: XML parsing/generation logic
    • VC2022: Port from C implementation
    • dotnet: Port from C implementation

🔧 Infrastructure Improvements

Code Quality & Testing

• Implement comprehensive test suite for all message types
• Create sample EXI files for each message type (test1-test5.exi available)
• Add roundtrip testing (EXI → XML → EXI validation)
  • test5.exi: 100% perfect roundtrip (43 bytes)
  • Automated roundtrip validation in test scripts
• Performance benchmarking across versions

Build & Deployment

• Automate build process for all platforms
  • Windows: build_all.bat (MSBuild + .NET)
  • Linux/macOS: build_all.sh (GCC + .NET)
• Create automated test scripts
  • Windows: test_all.bat
  • Linux/macOS: test_all.sh
• Build documentation: BUILD_INSTRUCTIONS.md
• Add continuous integration pipeline

Documentation

• Create API documentation for each version
• Write usage examples for each message type
• Document ISO 15118-2 compliance status

📊 Success Metrics

Functional Requirements

• Support all 8 core DC charging messages ✅
• Support all 8 Session & Service Management messages ✅
• Support all 6 Extended Features messages ✅
• Complete 18 V2G message types across all 3 platforms ✅
• Pass ISO 15118-2 compliance validation
• Maintain backward compatibility with existing CurrentDemand implementation ✅
• Clean output for production use (no debug messages) ✅

Quality Requirements

• 100% roundtrip accuracy (EXI → XML → EXI)
• Memory safety (no buffer overflows)
• Performance parity with original C implementation
• Consistent behavior across C/VC2022/dotnet versions

🎯 Current Focus

🎉 MAJOR MILESTONE ACHIEVED: Complete V2G Decoder Implementation across all platforms!

✅ Completed: All 18 V2G message types implemented across C, VC2022, and .NET:

• Phase 1: 8 DC Charging Core Messages (CableCheck, PreCharge, WeldingDetection, PowerDelivery + CurrentDemand)
• Phase 2: 8 Session & Service Management Messages (SessionSetup, ServiceDiscovery, Authorization, ChargeParameterDiscovery)
• Phase 3: 6 Extended Features Messages (PaymentServiceSelection, ChargingStatus, SessionStop)

Next Steps: Infrastructure improvements, testing, and compliance validation.

📝 Notes

• All message structures already exist in VC2022 and dotnet versions
• Focus on XML parsing/generation logic implementation
• Maintain DEBUG_PRINTF pattern for consistent debugging
• Test each message with real V2G communication scenarios