ReadyRead() signal in QUdpSocket isn't being triggered.
Guys - first time coding for networking stuff so there is possibility I'm doing something silly.
I am trying to write a small UDP server application.
I have a non-Qt client transmitting to this applications socket and I have verified this is sending ok using a small UDP echo program (which echoes the data received on a port to the screen) and also, I can see the packets received in wireshark.
I am using QUdpSocket and it would appear that this Binds ok on setup - but the readyRead() signal doesn't ever seem to get triggered.
I have included some of my code below - at the minute I am simply trying to emulate the little echo program.
Just to give some context to the below code - a button press on the UI calls 'setupNewSocket' on a port that is typed in on UI.
SocketHandler::SocketHandler(QObject *parent) :
udpSocket = new QUdpSocket(this);
connect( &w, SIGNAL(openNewUDPSocket(quint16)), this, SLOT(setupNewSocket(quint16)) ); connect( this, SIGNAL(printOnUI(QString,QString,QString)), &w, SLOT(updateUI(QString,QString,QString)) ); w.show();
udpSocket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort); QString data = QString( datagram.data() ); QString sender_address = sender.toString(); QString sender_port = QString("%1").arg(senderPort); emit printOnUI(data, sender_address, sender_port); }
void SocketHandler::setupNewSocket(quint16 port)
if( udpSocket->bind(QHostAddress::LocalHost, port) )
connect(udpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams()));
// bind has failed
You bind that socket to localhost: "if( udpSocket->bind(QHostAddress::LocalHost, port) )".
So your client should be sending data to localhost too.
You should set it to QHostAddress::Any or networkinterface address to receive from network.
Thanks - that was a silly mistake.