May 12, 2016 · USB virtual com port for STM32F4 Discovery ... How To: STM32F103C8T6 As An USB Device ( Virtual Serial Port / CDC ) - Duration: 11:34. Hugatry's HackVlog 64,284 views. 11:34.
So, when I used another STM4 Discovery board as a USB device and run on that device the STM32 USB device VCP (virtual com port) example and connected that board with the USB CDC host board - both boards talked to each other. So this seems to be step one for me.