nng VS cppzmq

I just published the other day some bindings to the NNG message passing library (https://nng.nanomsg.org/). You can do request/reply, publish/subcribe and other communication patterns. It's trivial to serialize (with Binary for example) any data structure and pass it around the network:

I put together quickly a binding to the NNG! library, it's simply a fork of the existing binding to Nanomsg! updated to work with NNG using the "compatible API". For basic usage seems to work pretty well:

I’m considering using msgpack + nng or msgpack + zmq

I've found NNG to be high quality, also has less restrictive license. https://nng.nanomsg.org/

for communication between a Discord bot and other applications on the same machine I have used ZeroMQ - relatively easy to use, very portable but still flexible enough. (I've heard though that ZeroMQ has been somewhat superseded by nng nowadays)

I agree with this, but would add NNg as a good messaging library. It’s the successor to the spiritual successor of ZeroMQ.

you can also look into https://github.com/nanomsg/nng

I found that I knew almost nothing about C++ and had to start reading and watching tutorials to understand what was happening in the code samples provided. In the end, I just followed the C++ SDK programming manual and managed to capture the image data with the provided library and source code and display it with OpenCV. But even though this manual made it possible to display the video images, I am still very confused about the implementation of the member functions of the provided classes. And since I want to share the image data with a Python script, I need to understand exactly what is happening. Since I couldn't find any simple enough resources on shared memory, I tried sending the image data over sockets using the ZeroMQ library library called cppzmq.

Maybe I am not understanding it correctly, the https://github.com/zeromq/libzmq is GPL v3, and header only file is https://github.com/zeromq/cppzmq MIT license? So I can use the header only library and I don't need to open source my code?