Send Message to a WebPage

Is it possible to a javascript to wait connections from other machines in the same network?

I need to open this webpage at a PC (which is connected by HDMI to a TV) and I need that others PCs at the same network send messages to this IP:PORT so the webpage can plot some things at the screen.

I don't want to host a server like WebRTC. I want to be p2p serveless. I just want to send a message to an IP:PORT and receive that connection with the main PC.

How can I do that?

Thanks in Advance