feat: Add enhanced EXI viewer with XML decode capability

- Implement complete CurrentDemandReq/CurrentDemandRes parsing (24 total fields)
- Add enhanced_exi_viewer.c with detailed message analysis
- Support -decode option for clean XML output (file-ready format)
- Enable ISO1, ISO2, DIN codec support in build configuration
- Fix C99 compatibility issues in makefiles (change -ansi to -std=c99)
- Create test utilities for hex string to EXI conversion
- Generate test files: test3.exi (CurrentDemandRes), test4.exi (CurrentDemandReq)

Features:
* Dual output modes: detailed analysis (default) vs XML (-decode)
* Complete V2G message type detection and parsing
* Session ID display in hex and ASCII formats
* Voltage/current/power readings with proper units
* All optional fields and status flags supported

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Debug/src/din/dinEXIDatatypes.d

@@ -0,0 +1,9 @@
+src/din/dinEXIDatatypes.d: ../src/din/dinEXIDatatypes.c \
+ ../src/din/dinEXIDatatypes.h ../src/codec/EXITypes.h \
+ ../src/codec/EXIConfig.h
+
+../src/din/dinEXIDatatypes.h:
+
+../src/codec/EXITypes.h:
+
+../src/codec/EXIConfig.h:

Debug/src/din/dinEXIDatatypesDecoder.d

@@ -0,0 +1,24 @@
+src/din/dinEXIDatatypesDecoder.d: ../src/din/dinEXIDatatypesDecoder.c \
+ ../src/din/dinEXIDatatypesDecoder.h ../src/din/dinEXIDatatypes.h \
+ ../src/codec/EXITypes.h ../src/codec/EXIConfig.h \
+ ../src/codec/DecoderChannel.h ../src/codec/EXIOptions.h \
+ ../src/codec/EXITypes.h ../src/codec/EXIHeaderDecoder.h \
+ ../src/codec/ErrorCodes.h
+
+../src/din/dinEXIDatatypesDecoder.h:
+
+../src/din/dinEXIDatatypes.h:
+
+../src/codec/EXITypes.h:
+
+../src/codec/EXIConfig.h:
+
+../src/codec/DecoderChannel.h:
+
+../src/codec/EXIOptions.h:
+
+../src/codec/EXITypes.h:
+
+../src/codec/EXIHeaderDecoder.h:
+
+../src/codec/ErrorCodes.h:

Debug/src/din/dinEXIDatatypesEncoder.d

@@ -0,0 +1,21 @@
+src/din/dinEXIDatatypesEncoder.d: ../src/din/dinEXIDatatypesEncoder.c \
+ ../src/din/dinEXIDatatypesEncoder.h ../src/din/dinEXIDatatypes.h \
+ ../src/codec/EXITypes.h ../src/codec/EXIConfig.h \
+ ../src/codec/EncoderChannel.h ../src/codec/EXITypes.h \
+ ../src/codec/EXIHeaderEncoder.h ../src/codec/ErrorCodes.h
+
+../src/din/dinEXIDatatypesEncoder.h:
+
+../src/din/dinEXIDatatypes.h:
+
+../src/codec/EXITypes.h:
+
+../src/codec/EXIConfig.h:
+
+../src/codec/EncoderChannel.h:
+
+../src/codec/EXITypes.h:
+
+../src/codec/EXIHeaderEncoder.h:
+
+../src/codec/ErrorCodes.h:

Debug/src/din/subdir.mk

@@ -0,0 +1,30 @@
+################################################################################
+# Automatically-generated file. Do not edit!
+################################################################################
+
+# Add inputs and outputs from these tool invocations to the build variables 
+C_SRCS += \
+../src/din/dinEXIDatatypes.c \
+../src/din/dinEXIDatatypesDecoder.c \
+../src/din/dinEXIDatatypesEncoder.c 
+
+OBJS += \
+./src/din/dinEXIDatatypes.o \
+./src/din/dinEXIDatatypesDecoder.o \
+./src/din/dinEXIDatatypesEncoder.o 
+
+C_DEPS += \
+./src/din/dinEXIDatatypes.d \
+./src/din/dinEXIDatatypesDecoder.d \
+./src/din/dinEXIDatatypesEncoder.d 
+
+
+# Each subdirectory must supply rules for building sources it contributes
+src/din/%.o: ../src/din/%.c
+	@echo 'Building file: $<'
+	@echo 'Invoking: GCC C Compiler'
+	gcc -I"../src/codec" -I"../src/din" -I"../src/iso1" -I"../src/iso2" -I"../src/xmldsig" -I"../src/appHandshake" -I"../src/transport" -I"../src/test" -O0 -g3 -Wall -c -fmessage-length=0 -std=c99 -MMD -MP -MF"$(@:%.o=%.d)" -MT"$(@:%.o=%.d)" -o "$@" "$<"
+	@echo 'Finished building: $<'
+	@echo ' '
+
+