public function writeBufferRequestBacklogAll($messageIdFirst, $messageIdLast, $maxAmount, $additional)
    {
        return $this->write(array(
            Protocol::REQUEST_SYNC,
            "BacklogManager",
            "",
            "requestBacklogAll",
            new QVariant((int)$messageIdFirst, 'MsgId'),
            new QVariant((int)$messageIdLast, 'MsgId'),
            (int)$maxAmount,
            (int)$additional
        ));
    }