There are two ways to incorporate the MityDSP net library into your application, link with the release and/or debug builds of the library, include the sources in your application project.
For the debug build you need to add the library DspNetD.lib. For the release build you need to add the libraries DspNet.lib.
["Linker" Settings: "Debug"] Options=-q -c -o".\Debug\CP_App.out" -x -i"$(MityDSP_2_1)\lib" -l"DspCoreD.lib" -l"DspNetD.lib" -l"DspLwipD.lib" ["Linker" Settings: "Release"] Options=-q -c -o".\Release\CP_App.out" -x -i"$(MityDSP_2_1)\lib" -l"DspCore.lib" -l"DspNet.lib" -l"DspLwip.lib"
See Also:
Adding the MityDSP lwIP Port To Your Project
Adding The core Library To Your Project