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How to resolve this error

cmake --build .
[ 2%] Built target Common
[ 23%] Built target Can
[ 53%] Built target J1939
[ 55%] Linking CXX executable j1939Decoder
/usr/bin/ld: ../../J1939/libJ1939.so.1.0.0: undefined reference to Json::Value::operator=(Json::Value&&)' /usr/bin/ld: ../../J1939/libJ1939.so.1.0.0: undefined reference to Json::Value::Value(unsigned long)'
collect2: error: ld returned 1 exit status
make[2]: *** [BinUtils/j1939Decoder/CMakeFiles/j1939Decoder.dir/build.make:86: BinUtils/j1939Decoder/j1939Decoder] Error 1
make[1]: *** [CMakeFiles/Makefile2:488: BinUtils/j1939Decoder/CMakeFiles/j1939Decoder.dir/all] Error 2
make: *** [Makefile:130: all] Error 2

Is there a proper example code for how to receive and send j1939 CAN frames in C++ ? The sample C++ code that exists in CAN folder does not work, giving me errors like these:

undefined reference to `Can::CanEasy::initialize(unsigned int, void ()(Can::CanFrame const&, Utils::TimeStamp const&, std::__cxx11::basic_string<char, std::char_traits, std::allocator > const&, void), bool (*)())'

undefined reference to Can::CanEasy::mSniffer' undefined reference to Can::CanEasy::mSniffer'
undefined reference to `Can::CanSniffer::sniff(unsigned int) const'

Add basic multipacket BAM and CM send and receive utilities with no assumptions about SPNs.
Will submit a PR shortly.

Has anyone had luck getting the Wireshark dissector to work? I am able to build it, but I noticed that it appears to conflict with the existing standard Wireshark J1939 dissector which takes precedence when you analyze a packet. Thanks in advance for any help or pointers to information you can give me on this.

As a user of this library, I want to just use a few parts of the library for things like J1939/Transport, but I am required to have a bunch of other dependencies to compile such as libgtest-dev protobuf-compiler libprotobuf-dev libncurses-dev libwebsockets jsoncpp

For example, if I just want transport, I should be able to build transport, with minimal requirements.

cmake -S . -B build && cmake --build build --target transport

Hello @famez

Many thanks for this great project!

I have tried to compile it, and it seems that a class called BamConnectionManager is missing.

It is utilized in the Qt app here:
https://github.com/famez/J1939-Framework/blob/master/J1939Viewer/trcloader.cpp#L33

Could you please add it?
Thanks!

Thanks for giving the wonderful project. I'm learning the j1939 protocol stack and find the project lack of RTS/CTS transfer protocol. Does it support it？

I created a thread that calls CanSniffer::sniff().
I can see my ontimeout() callback being called by the sniffer. When I call CanSniffer::finish() from another thread, I get a segmentation fault at the caller of CanSniffer::sniff().
My code is compiled using CMake, on Yocto, linking with LibCan.so and LibJ1939.so

Any clues?
Thanks

@famez hi, thank you for your grate project
i want to compile the project ,but i stop in the problem of json.can you help me?

../../J1939/libJ1939.so.1.0.0: undefined reference to Json::Value::operator=(Json::Value&&)' ../../J1939/libJ1939.so.1.0.0: undefined reference to Json::Value::Value(unsigned long)'
collect2: error: ld returned 1 exit status
BinUtils/j1939Decoder/CMakeFiles/j1939Decoder.dir/build.make:96: recipe for target 'BinUtils/j1939Decoder/j1939Decoder' failed

thank you

Not able to build GUI_WEB.
OS: Ubuntu~20.04

CMake Error at CMakeLists.txt:9 (protobuf_generate_cpp):
  Unknown CMake command "protobuf_generate_cpp".


-- Configuring incomplete, errors occurred!
See also "/home/zbr1kor/J1939-Framework/GUI_WEB/backend/build/CMakeFiles/CMakeOutput.log".
make: *** [Makefile:256: cmake_check_build_system] Error 1

Very interesting lib you have here...
Any chance it could be called from a python program to replace python-can ?
Am just trying to figure out a way to read all frames from a 1mbps bus without loosing 4/5 of all messages.

Thanks !

An extra null pointer check is not needed in functions like the following.

• ISingleton::releaseInstance
• J1939Factory::unregisterAllFrames

How to convert J1939DA.xls to the specific database.json format expected here ?
There are converters out there but none for the format used here.