PCAN_USBPRO_SETBTR
case PCAN_USBPRO_SETBTR:
pcan_msg_add_rec(&um, PCAN_USBPRO_SETBTR, dev->ctrl_idx, ccbt);
[PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),