# V2G EXI Decoder - Development Roadmap

## 📋 Current Status & Next Steps

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

### 🎯 Next Priority: V2G Message Implementation

#### Phase 1: DC Charging Core Messages (Highest Priority)
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)

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)

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
- [ ] Add roundtrip testing (EXI → XML → EXI validation)
- [ ] Performance benchmarking across versions

#### Build & Deployment
- [ ] Automate build process for all platforms
- [ ] Create release packaging scripts
- [ ] 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
- [ ] 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
**Immediate Next Step**: Implement CableCheckReq/Res in original C version as foundation for other platform ports.

### 📝 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