usb/shell/prj.conf

CONFIG_SHELL=y
CONFIG_USB_DEVICE_STACK_NEXT=y
CONFIG_USBD_SHELL=y
CONFIG_USBD_LOOPBACK_CLASS=y

CONFIG_LOG=y
CONFIG_USBD_LOG_LEVEL_WRN=y
CONFIG_UDC_DRIVER_LOG_LEVEL_WRN=y