How to parse multicasts in QT or pure c++?

Question

Qt

There is an application / applications in the local network that send multicasts with the information I need, I need to catch the packet / packets and isolate the information from it.
The server application is written in Delphi, but I need to make a library so that anyone can work with this info.
I know from which ip address the multicast is coming from.
But I don't know the format of this multicast. I understand that first I need to decrypt / parse it somehow
. I have access to the source code of the server application, but I have never worked with it. Are there any other ways to parse these messages?
For me, working with the network is still a dark forest.
There is knowledge of QT/c++ at the level of writing simple non-network programs.

Answer 1

See the Qt SDK for examples.
https://doc.qt.io/qt-5/qtnetwork-multicastreceiver...