QUdpSocket High rate message reading

[danics]

Hi, everybody!

I have a strange issue in working with QUdpSocket and readyRead signal, I can say it's not working as I think,

I create a QUdpSocket and bind it to some port , connect the readyRead signal to my slot and I read all the pending datagram as below

if(!udp_listener)
{
      udp_listener = new QUdpSocket(this);
      connect(udp_listener, SiGNAL(readyRead()), this, SLOT(readBuffers(), Qt::QueuedConnection);
      // the rate of receiving data is 10 msec if i dont put Qt::QueuedConnection, it didn't receive any more signal after first received. why ???
      // change the rate of data to 1 sec and this code work well without Qt::QueuedConnection !!! 
}
 
udp_lister.bind(Any, 5555);

if(!udp_listener)
{
      udp_listener = new QUdpSocket(this);
      connect(udp_listener, SiGNAL(readyRead()), this, SLOT(readBuffers(), Qt::QueuedConnection);
      // the rate of receiving data is 10 msec if i dont put Qt::QueuedConnection, it didn't receive any more signal after first received. why ???
      // change the rate of data to 1 sec and this code work well without Qt::QueuedConnection !!! 
}

udp_lister.bind(Any, 5555);

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and my readBuffers code

void readBuffers() {
    QString buffer;
    while(udp_listener->hasPendingDatagrams()) {
           QByteArray received;
           received.resize(udp_listener->pendingDatagramSize());
           udp_listener->readDatagram(received, received.size(), 0,0);
           buffer.append(received);
           // Do some job in 1 msec on buffer and take data from buffer
           if(/* some works done */) buffer.clear(); // almost every time my buffer got cleared 
    }
}

void readBuffers() {
    QString buffer;
    while(udp_listener->hasPendingDatagrams()) {
           QByteArray received;
           received.resize(udp_listener->pendingDatagramSize());
           udp_listener->readDatagram(received, received.size(), 0,0);
           buffer.append(received);
           // Do some job in 1 msec on buffer and take data from buffer
           if(/* some works done */) buffer.clear(); // almost every time my buffer got cleared 
    }
}

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I thought my problems solved with using of Qt::QueuedConnection but today I add another widget to my project and updated it every 100 msec and I don't know how but my slot didn't signaled any more after 2 seconds.

If I change my timer interval or sending data rate to 1 sec, everything is fine.

all of my classes and my widgets live in main program's thread and I don't use another thread, but it seems I should!
so why signals dropped by Qt eventloop.
I check my socket state and it did'nt change after Bound.

Thanks in advance