I'm trying to make my TLSR8278 USB dongle "talk" to the PC (two way communication with PC as USB/UART slave, communication will be initiated by the board/dongle). Is it possible to configure USB as a VCP (virtual COM / serial port)? Or at least of some kind of HID device different from a keyboard or mouse, so that PC application will listen for specific reports?

What I tried so far without success is:

SDK: ble mesh

in file app_config_8278.h modified #define HCI_ACCESS to HCI_USE_UART,

configured both defines as they're pointing to LEDs on the dongle like

#define UART_TX_PIN UART_TX_PD7

#define UART_RX_PIN UART_RX_PA0

attached a TTL 3v3 -> USB (CH341 chip dongle) but nothing is sent from TLSR dongle, in which while loop I use uart_Send function every second.

Then tried to change back  #define HCI_ACCESS to HCI_USE_USB and used my own HID monitor. I detect the TLSR dongle, but cannot receive anything from it.

Where can I start from?