def _send_block_request(self, transaction):
        """
        A former request resulted in a block wise transfer. With this method, the block wise transfer
        will be continued, including triggering of the retry mechanism.
        
        :param transaction: The former transaction including the request which should be continued.
        """
        transaction = self._messageLayer.send_request(transaction.request)
        # ... but don't forget to reset the acknowledge flag
        transaction.request.acknowledged = False
        self.send_datagram(transaction.request)
        if transaction.request.type == defines.Types["CON"]:
            self._start_retransmission(transaction, transaction.request)