Resolved Simulating joystick input with C#

[TL;DR: I found a way to simulate keyboard input, but how do I simulate joystick input? Do I need to make my own device driver?]

So I was playing a game one day, and thought that it would be cool to use my phone as the controller.
I made a program that could do that, then I need to find a way to make a joystick.
It was easy enough, but I was stuck on trying to simulate joystick input. In the Internet I found a way to simulate keyboard input using C#, but not joystick input.
One source said that you need your own device driver to do that.
Is this true? If not, then how do I do it?

 

I use ViGEm, it works perfectly!

 

You can use FreePIE its developed by one of my coworkers.

https://andersmalmgren.github.io/FreePIE/