Sending packets from server to client

Hello. I recently develop on forge. Can you give me documentation on sending packages or tell me how this can be implemented? For example, I need to transfer information about a player in a package to him on a client. How can i do this?

Take a look at this. Its the opposite way in which you want but should point you in the right direction.

I apologize, but I have been working with sponge relatively recently. I have done more than just this forum. But even in the topic you attached, I did not find useful information. People just debated. I wanted to find out if there is something similar to the sendPluginMessage () method in Bukkit.