program codes setup to communicate with arduino uno serially connected router

Hi guys.

I have an Arduino uno already connected to a wifi serial which is setup as a router for my laptop to connect.

The router has already been configured to be connected by other devices.

What I want to know is how do I actually talk to the arduino board from my laptop when my laptop is directly connected to the router via wifi.

The program i am using on my computer is visual studio. I would like to know what protocol is actually required. >:(

Please give me your guidance or suggestion on what i should use?