tutorial/qt/udpserver.txt

QUdpSocket* m_udpSocket = nullptr;
    m_udpSocket = new QUdpSocket(this);
    m_udpSocket->bind(QHostAddress::Any, 8776);
    connect(m_udpSocket, &QUdpSocket::readyRead, this, [this](){
        while(m_udpSocket->hasPendingDatagrams())
        {
            QByteArray datagram;
            QHostAddress address;
            quint32 ipAddress;
            datagram.resize(m_udpSocket->pendingDatagramSize());
            qint64 bytesRead = m_udpSocket->readDatagram(datagram.data(), datagram.size(), &address);
            ipAddress = address.toIPv4Address();
            QString ipAddressString = QString("%1.%2.%3.%4").arg((ipAddress>>24) & 0xFF).arg((ipAddress>>16) & 0xFF).arg((ipAddress>>8) & 0xFF).arg((ipAddress) & 0xFF);
            qDebug() << datagram.data() << ipAddressString;
        }
    });