STM32PRGFW-UTIL not working in CP_Serial_boot with USB DFU interface

[pdematteis]

As reported in the GitHub page, STM32PRGFW-UTIL should work with boards with USB DFU or UART serial interface.

It works properly with UART, but it doesn't with USB DFU, showing the following error:

Download in Progress:
██████████████████████████████████████████████████ 100%

File download complete
Time elapsed during download operation: 00:00:00.681

RUNNING Program ...
  PartID:      :0x01
Error:
Unable to reconnect the target device: time out expired


Error: Start operation failed at partition 0x01
Error: TSV flashing service failed

The code seems to ignore USB requests, since GetCommandOpcode is not defined:

static OPENBL_OpsTypeDef USART_Ops =
{
  OPENBL_USART_Configuration,
  NULL,
  OPENBL_USART_ProtocolDetection,
  OPENBL_USART_GetCommandOpcode,
  OPENBL_USART_SendByte
};

static OPENBL_OpsTypeDef USB_Ops =
{
  OPENBL_USB_Configuration,
  NULL,
  OPENBL_USB_ProtocolDetection,
  NULL,
  NULL
};

void OPENBL_CommandProcess(void)
{
  uint8_t command_opcode;

  /* Get the user command opcode */
  if (p_Interface->p_Ops->GetCommandOpcode != NULL)
  {
    command_opcode = p_Interface->p_Ops->GetCommandOpcode();

    switch (command_opcode)
    {
      case CMD_GET_COMMAND:
        if (p_Interface->p_Cmd->GetCommand != NULL)
        {
          p_Interface->p_Cmd->GetCommand();
        }
        break;

Does somebody know how to get it working properly?

Thanks!