@BigBen
Assuming you are wanting to return those values as soon as the startButton is clicked, you can just call void QDialog::done(int r) with the desired value. Or do that later with the value if you want it returned later.

@dave2
for completeness sake, I tested it with MacOS & Clang + LLDB, doesn't work at all there as well

@VRonin
Thanks for your input - there seem to be some misunderstanding.
I can not and do not want to wait for the acknowledge of the server as a trigger to sent the next log message - this is against the idea.
Log messages need always to be sent, regardless wether the server acknowledges or not - imagine the server even does not acknowledge.

Every message sent has an ID# that is incremented by one for every new log message sent.
The server acknowledges every message with returning the ID#.

Looking at the network of the server with Wireshark and having incoming log messages with time stamps of the same msec - obviously the server has no time to send the acknowledge between incoming protocols. I.e. Sending #1 and # 2 in such a short sequence, obviously when sending #2 the counter for a missed message goes up to one.
This is inherit by this system and is by design.

Therefore, I'm going to implement a gap of at least a few msec between sending messages.
Because the messages are all handled and forwarded in the application by signals / QtEvent queues, I dont have a solid idea so far how to do this.
I may have to create a time gated sending queue before handing the messages over to the signal and the QtEvent queue.