how can I establish a local area network connection ??

I am looking for alternatives to create a local area connection, to create a virtual reality system. So I am looking for ways to create a server or local connection, without going over the internet, just for communication between mobile and computer.

I am currently studying the use of Node.js, but with this issue of Unet becoming absolute, the question arose. Can I still implement this kind of connection? will Unet discontinuity get in the way of something? There are more efficient solutions for making this communication.

I am a student in digital game development, and I am researching for a college project.