如果用python 写可以接收到设备发过来的广播，代码如下
def broadcast_receive():
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    #server_socket.bind(('192.168.0.100', BcastPort))
    server_socket.bind(('0.0.0.0', BcastPort))
    server_socket.setblocking(0)
    i = 0
    while True:
        try:
            data, addr = server_socket.recvfrom(10000)
            i += 1
            print('broadcast_receive: {0}'.format(i))
            print('Received from {0} --- {1}'.format(addr, data))
            print('len: ', len(data))





但换成QUdpSocket 后没有收到设备发出的广播,谢谢大佬的赐教...

udpSocket = new QUdpSocket(this);
   // udpSocket->setSocketOption(QAbstractSocket::MulticastTtlOption);
    udpSocket->bind(QHostAddress::AnyIPv4, BcastPort);
    //udpSocket->bind(QHostAddress::LocalHost, BcastPort);
    //udpSocket->bind(QHostAddress::Broadcast, BcastPort);
    //udpSocket->bind(QHostAddress::Any, BcastPort);

    udpSocket->waitForConnected(10000);

    connect(udpSocket, SIGNAL(readyRead()),
                this, SLOT(readPendingDatagrams()));



void MainWindow::readPendingDatagrams()
{
    qDebug() << "readPendingDatagrams";
    while (udpSocket->hasPendingDatagrams())
    {
        QByteArray datagram;
        datagram.resize(udpSocket->pendingDatagramSize());
        QHostAddress sender;
        quint16 senderPort;

        udpSocket->readDatagram(datagram.data(), datagram.size(),
                                &sender, &senderPort);

        QString DataAsString = QString(datagram.data());
        qDebug() << DataAsString;

        //processTheDatagram(datagram);
    }
}
--
FROM 76.90.44.*