If you are going to wire this to the Jackpot, I would recommend getting this RJ12 pendant adapter to add some protection. People have damaged controllers without it.
Due to that risk and my use cases, I’ve only connected controllers wirelessly via websockets and TCP/telnet.
I do believe that if you send lines of gcode over serial, it will run it.
Here’s a link to a related page on the FluidN. Wiki. There is a link to some example projects too.
Note that the WebUI uses a websocket and you shouldn’t have more than one thing connected via a websocket at the same time. You can have multiple telnet connections. I use a websocket for a wireless pendant and telnet on an LED controller so I can have both connected at the same time.