qt中的udp组播 linux

#include <QUdpSocket>
#include <QHostAddress>

int main() {
    QUdpSocket udpSocket;
    QByteArray datagram = "Hello Multicast Group!";
    QHostAddress groupAddress("239.255.43.21");
    quint16 port = 45454;

    udpSocket.writeDatagram(datagram.data(), datagram.size(), groupAddress, port);
    return 0;
}

#include <QUdpSocket>
#include <QHostAddress>

int main() {
    QUdpSocket udpSocket;
    QHostAddress groupAddress("239.255.43.21");
    quint16 port = 45454;

    udpSocket.bind(port, QUdpSocket::ShareAddress);
    udpSocket.joinMulticastGroup(groupAddress);

    connect(&udpSocket, &QUdpSocket::readyRead, [&]() {
        while (udpSocket.hasPendingDatagrams()) {
            QByteArray datagram;
            datagram.resize(udpSocket.pendingDatagramSize());
            udpSocket.readDatagram(datagram.data(), datagram.size());
            qDebug() << "Received:" << datagram;
        }
    });

    return 0;
}