Use flatc.exe in the command line to compile ModeliProtocol.fbs.
For C++: flatc -c ModeliProtocol.fbs creates ModeliProtocol_generated.h.
For C#: flatc -n ModeliProtocol.fbs creates a folder Network.
The namespace is Network. Include the generated files and the neccessary flatbuffer libs (at https://github.com/google/flatbuffers)