ipwxpWhen you use uFCoder static library, you must define DL_USE_STATIC_LIB macro before including the uFCoder.h After uFR-library version 4.4.1 an additional library [ws2_32.lib] must be included to support UDP transfer protocol #pragma comment(lib, "ws2_32.lib") Additionally, linkage to "ftd2xx_coff.lib" is mandatory. As of version 6.0.6, linking with "-lsetupapi" flag is mandatory as well.