Hello,

I can not get QUdpSocket working to receive broadcast messages with Qt5 
from ptxdist (non GUI build).
I have attached a minimal code example. Such code was working fine when 
building against Qt 4.8.7.
I have tested the code on Windows with Qt 5.5.1 and under Debian Linux 
with Qt 5.3.2.

I also tried to build different versions of Qt with ptxdist: 5.4.1 and 
5.5.1 (I adapted the patches accordingly).

When the test programm runs I see that the receive queue fills in 
netstat -a:
Proto Recv-Q Send-Q Local Address           Foreign Address         
State
udp     1024      0 (null):5025             (null):*
I think that the bind works, but the packets are not delivered with the 
Qt signal.
I tried to receive broadcast messages using plain C code (bind(), 
recvfrom(), etc.) which works fine.

Therefore I think it is a Qt problem. But I tested three different 
versions (5.4.2 from ptxdist and 5.4.1 + 5.5.1), that I can not believe 
it really.
Does anyone successfully used QUdpSocket from a ptxdist Qt 5 build?


My envirnoment:
- OSELAS.Toolchain-2014.12.1 (arm-cortexa8-linux-gnueabihf)
- ptxdist-2015.10.0
- Mainline Kernel 3.12 with PREEMPT_RT (with minimal patches for the 
SoC)
- Freescale i.MX537 (Ka-Ro TX53 module)


Does anyone have an idea what could be wrong?
Is it possible to verify the qt build from ptxdist using a unit test or 
something similar?


Best regards,
Matthias