Is creating packages possible?

Hi, I have some (small) coding knowledge and i have created very simple bots for different games but I wanted to step up and learn something a little bit more advanced. But im stuck now and I dont know if it is because what I want to do is impossible or if I am looking in the wrong direction.

Is it possible to capture packages sent by my browser when I play a flash web browser game? Is it then possible to write a c/c++ program that simulate that package and send it every X hour?

So far I have only found a couple of programs that I think captures packages (wireshark, fiddler and charles). I also think that I have found the packages that I belive are what I am looking for, but when I try to resend them through those programs it dosnt work. That is why I am wondering if it is actually possible to capture and then simulate packages (not through those programs but by writing a program myself).

I know that it is a large project and I dont want a complete code. I simply want to know if its possible and if I am looking in the right direction.

Thank you for reading and thank you for your help.