Problem with school project, Raspberry & Bigbelly

So. Hi.
I have a project where i have to replace the altium card that help to control the Bigbelly (http://bigbelly.com/) through an interface (interface that i have but only in .exe format), by a new interface made with Qt while using Qtsocket and by replacing that altium card by a raspberry.
The actual problem is that i don't know what information i have to send to the raspberry so he could control the bigbelly.
I can give you the command that help to control the Bigbelly through serial link if needed.
I'm not sure how to use QT to send the good information even if i know i have to use QtSocket.

Thanks for all, and i have a nice day

Edit :
Right now i'm trying to understand how to send a message when i push a button, i already made slotConnected, slotDisconnected, and ReadyRead fonction.