Reception of UDP packet on iOS stagnates

laseranichris

Hello!

I am writing an App for iOS using Qt 5.3.1.

The App is supposed to receive UDP packets sent about every 40 mS.
The packets contain only a few bytes.

I connect the signal "readyRead" with my method to process the incoming data:

@QObject::connect(&udpSocket, SIGNAL (readyRead()), this, SLOT (processPendingDatagrams()));
@

Now I got the following problem:
Instead of receiving the packets one by one I get burst of packets and than breaks of about 300 mS.

Using Qt on Mac OS X or Windows the packets are received equidistant.

It seems that there is some packet queue and the signal "readyRead" is emitted after several packtes are received.
I already tried to set the read buffer size and socket options like "LowDelayOption" or "ReceiveBufferSizeSocketOption".
Nothing made a difference.

Does anybody has experience with UDP packets on iOS using Qt?

Thanks for your help!