@Override
    public void pauseResume() throws Exception {
        logger.log(Level.INFO, "Pause/Resume");
        try {
            switch(getControlState()) {
                case COMM_IDLE:
                default:
                    if (!isSendingFile()) {
                        throw new Exception("Cannot pause while '" + getControlState() + "'.");
                    }
                    // Fall through if we're really sending a file.
                    // This can happen at the beginning of a stream when GRBL
                    // reports an error before we send it a status request.
                case COMM_SENDING:
                    this.controller.pauseStreaming();
                    return;