Disconnect outdated clients Netcode for GameObjects

Questions & Answers
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1

I am currently working on a game that uses Netcode for GameObjects.

I need a way to make sure that players on an outdated client can not join a Lobby / Relay session.

Does anyone know how to do this?

2

I found the solution.

You can make a Github repo with a txt file that only contains the version number, then receive that number in game using Unity Web Requests. You can then create a variable containing the client version number, if they do not match, the player is on an outdated client. If anyone needs it, here is my code for this:

using System.Collections;
using UnityEngine;
using UnityEngine.Networking;

public class CheckVersion : MonoBehaviour
{
    public static int clientVersion = 5;
    [SerializeField] private string web_url;
    [SerializeField] private GameObject incorrectVersionScreen;

    private IEnumerator Start()
    {
        using(UnityWebRequest unityWebRequest = UnityWebRequest.Get(web_url))
        {
            yield return unityWebRequest.SendWebRequest();

            if(unityWebRequest.result == UnityWebRequest.Result.ConnectionError  || unityWebRequest.result == UnityWebRequest.Result.ProtocolError)
            {
                Debug.Log("Error fetching web content");
            }
            else
            {
                int recievedVersion = -1;
                int.TryParse(unityWebRequest.downloadHandler.text, out recievedVersion);

                Debug.Log("Recieved version " + recievedVersion);
                if(clientVersion != recievedVersion)
                {
                    incorrectVersionScreen.SetActive(true);
                    Time.timeScale = 0f;
                }
            }
        }
    }
}