On Tuesday 02 October 2018 15:43:39 Jason H wrote:
> I have an app (Desktop) that I want it to know about other running instances
> on the local network. I figured UDP broadcast was a natural choice. I tried
> it, but I never saw anything but my own (local) packets. There's quite a
> few stackoverflow questions, but none used Qt. I'm wondering if it's a
> wifi/router thing?
>
> The hosts are on the same WiFi SSID and address space:
> 10.31.4.26 host1
> 10.31.4.202 host2
>
> Both are on my desk.
> HostInfoService::HostInfoService(...) {
> ...
> udpSocket4.bind(QHostAddress::Any, 13999, QUdpSocket::ShareAddress);
> connect(&udpSocket4, SIGNAL(readyRead()), this,
> SLOT(readPendingDatagrams())); ...
> }
>
> void HostInfoService::readPendingDatagrams()
> {
> for (auto udpSocket: {&udpSocket4 } ) { //, &udpSocket6}) {
> while (udpSocket->hasPendingDatagrams()) {
> QNetworkDatagram datagram =
> udpSocket->receiveDatagram();
> QString host = QString(datagram.data().constData());
> messages[host] = datagram.senderAddress();
> qDebug() << Q_FUNC_INFO << host <<
datagram.senderAddress().toString();
> }
> }
> }
>
> I also tried on an IPv6 socket, no joy.
>
> Has anyone else done something like this?
I recently did this, using Qt. Worked with a problem, but on a wired
connection.
BCastServer::BCastServer(QObject *parent)
: QObject(parent)
{
m_listeningSocket = new QUdpSocket(this);
m_listeningSocket->bind(45454, QUdpSocket::ShareAddress);
connect(m_listeningSocket, &QUdpSocket::readyRead, this,
&BCastServer::processPendingDatagrams);
}
--
Best Regards
Reinhardt Behm
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