#include <QUdpSocket>
#include <QtDebug>

class Connect : public QObject
{
    Q_OBJECT
public:
    Connect()
    {
            // linux box
//        m_host = QHostAddress("fe80::f66d:4ff:fe02:5ee7%eth0");
//        m_dest = QHostAddress("FE80::2F4:B9FF:FE65:52DF%eth0");
            // mac box
        m_host = QHostAddress("fe80::60c:ceff:fedb:8018%en0");
        m_dest = QHostAddress("FE80::2F4:B9FF:FE65:52DF%en0");

//        m_dest = QHostAddress("192.168.10.1");

        m_sock = new QUdpSocket(this);
        m_port = 6000;
        m_sock->bind(QHostAddress::AnyIPv6, m_port);
        connect(m_sock, SIGNAL(readyRead()), this, SLOT(readClient()));
    };
    ~Connect()
    {
        delete m_sock;
    };
    void send(QByteArray data)
    {
        qDebug() << "scope id = " << m_dest.scopeId();
        qint64 ret = m_sock->writeDatagram(data, m_dest, m_port);
        if (ret != data.size())
        {
            qDebug() << "oops ret " << ret << " error:" << m_sock->error();
        }
        else
        {
            qDebug() << "success";
        }
    };

public slots:
    void readClient(void)
    {
        QUdpSocket *socket = dynamic_cast<QUdpSocket*>(sender());

        while (socket->state() == QAbstractSocket::BoundState &&
               socket->hasPendingDatagrams())
        {
            QByteArray buffer;
            buffer.resize(socket->pendingDatagramSize());
            QHostAddress sender;
            quint16 senderPort;
            socket->readDatagram(buffer.data(), buffer.size(),
                                 &sender, &senderPort);
            qDebug() << "receiving " << buffer.size() << " bytes";
        }
    };

private:
    QUdpSocket   *m_sock;
    QHostAddress  m_host, m_dest;
    quint16       m_port;
};

int main(int argc, char **arg)
{
    Connect test;
    test.send("test data");
    return 0;
}

#include "main.moc"