ems_usb_control_cmd
err = ems_usb_control_cmd(dev, CONTR_CAN_MESSAGE | CONTR_CONT_ON);
err = ems_usb_control_cmd(dev, CONTR_CAN_STATE | CONTR_CONT_ON);
err = ems_usb_control_cmd(dev, CONTR_BUS_ERROR | CONTR_CONT_ON);