void MyServer::sendToClient(/*QTcpSocket*/ QIODevice *pSocket, Message *toSend)
{
    QByteArray arrBlock;
    QDataStream out(&arrBlock, QIODevice::WriteOnly);

    out.setVersion (QDataStream::Qt_4_8);
    out << quint16 (0) << QTime::currentTime() << *toSend;
    out.device ()->seek (0);
    out << quint16 (arrBlock.size()- sizeof(quint16));

    pSocket->write (arrBlock);
    pSocket->waitForBytesWritten (50);
}

void MyClient::slotReadyRead ()
{
    QDataStream in (m_pTcpSocket);
    in.setVersion (QDataStream::Qt_5_3);
    for (;;)
    {
        if (!m_nNextBlockSize)
        {
            if (m_pTcpSocket->bytesAvailable() < sizeof(quint16))
                break;
            in >> m_nNextBlockSize;
        }
        if (/*dataAvailable*/m_pTcpSocket->bytesAvailable() < m_nNextBlockSize)
            break;
        QTime mytime;
        QString str = mytime.toString();
        in >> mytime >> *lastMessage;
.....
}