QT Trying to receive data from specific IP address using UDP

inzamam

I am trying to receive data from specific IP address (like 166.0.0.245) using UDP protocol in QT. I am having multiple connections in my network which are udp. But the problem is i am receiving from any ip address rather than specific IP address.

Below i am attaching my code where i am setting the ip address of my receiver i.e 166.0.0.34 and my senders IP address is 166.0.0.245 -> where do i specifically set this ip address so that i can receive only that ip address and discard rest of the ip address in my network. Plz can somebody suggest me where do i specifically set my ip address at the receivers side which accepts only one sender with specific ip address and port.

Thanks in advance

NetBroadcasterDlg::NetBroadcasterDlg(QWidget *parent) : //Main Function QWidget(parent), ui(new Ui::NetBroadcasterDlg) {

//ethernet initialisation and binding wini
udpSocket = new QUdpSocket(this);
udpSocket_send = new QUdpSocket(this);

udpSocket->bind(QHostAddress("166.0.0.34"), 1100, QUdpSocket::ShareAddress);
connect(udpSocket, SIGNAL(readyRead()),
this, SLOT(processPendingDatagrams()));
... }

void NetBroadcasterDlg::processPendingDatagrams() {

//Read data from ethernet
while (udpSocket->hasPendingDatagrams()) {
datagram.resize(int(udpSocket->pendingDatagramSize()));

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

// Sending data to the Target

udpSocket_send->writeDatagram(datagram.data(), datagram.size(),
                         QHostAddress("166.168.1.20"), 2500);   //target address and port

... }

Christian Ehrlicher

@inzamam said in QT Trying to receive data from specific IP address using UDP:

receiving from any ip address rather than specific IP address.

If more processes sending to your QUdpServer to the correct port you have to use QUdpSocket::readDatagram() and inspect the sender address.

inzamam

@Christian-Ehrlicher Thanks, i have inspected it , but how do i specifically set @ receivers end take only this ip address and rest all neglect it.

Christian Ehrlicher

@inzamam said in QT Trying to receive data from specific IP address using UDP:

but how do i specifically set @ receivers end take only this ip address and rest all neglect it.

Take a look at the functions of QNetworkDatagram and you will find a lot of stuff - even a function to get the sender address.

inzamam

@Christian-Ehrlicher Thanks i'll look into that.

inzamam

Thanks, I got it while i tried using the below code.

QHostAddress fromAddress;
udpSocket->readDatagram(datagram.data(), datagram.size(),&fromAddress);

if(fromAddress.isEqual(QHostAddress("166.0.0.245"))
{
// filtered data
}