Sample code server chat gui and client chat gui TCP / IP

[high_flyer]

Why not start with the Qt examples?
http://doc.qt.io/qt-5/qtnetwork-netw...t-example.html

[giorgik]

Hi high_flyer, I'm going to see this example you indicated to me. In practice what I would like to do is a TCP / IP server on wifi (static IP addresses) that must be able to receive and send strings. The same thing I have to do on the Android client side for the smartphone.

[high_flyer]

Wifi is not relevant from the perspective of your code - your application requests access to a url, that system will provide it.
What is the involved hardware is not important.
Start with the example it will give you the first basics of networking.