Qt QUdpSocket: readyRead()信号和相应的槽不能正常工作。

I have problems to find why my short QUdpSocket example is not working. I plan to use only one UDP socket to read and write to an embedded device at 192.168.2.66 on port 2007. The device will reply always on port 2007 to the sender. I tested the device with an UDP terminal software and works as I said. So, I designed a simple class to embed the functions needed to manage the device:I have problems to find why my short QUdpSocket