RelaSphere/Assets/GameAssets/Scripts/Multiplayer/Server.cs

using System.Collections;
using System.Collections.Generic;
using TMPro;
using Unity.Netcode.Transports.UTP;
using Unity.Netcode;
using Unity.Networking.Transport.Relay;
using Unity.Services.Relay.Models;
using Unity.Services.Relay;
using UnityEngine;
using Unity.Services.Authentication;
using Unity.Services.Core;
using Unity.Services.Lobbies.Models;
using Unity.Services.Lobbies;

public class Server : MonoBehaviour
{
    [SerializeField] private RS_Button button;
    [SerializeField] private string lobbyName;
    [SerializeField] private int maxPlayers;

    private float heartbeatTimer = 10f;
    private Lobby hostLobby;

    private async void Start()
    {
        await UnityServices.InitializeAsync();

        AuthenticationService.Instance.SignedIn += () =>
        {
            Debug.Log("Server Launched. " + AuthenticationService.Instance.PlayerId);
        };

        await AuthenticationService.Instance.SignInAnonymouslyAsync();
    }

    private void Update()
    {
        HandleLobbyHeartbeat();
    }

    private async void HandleLobbyHeartbeat()
    {
        if (hostLobby != null)
        {
            heartbeatTimer -= Time.deltaTime;
            if (heartbeatTimer < 0f)
            {
                float heartbeatTimerMax = 15f;
                heartbeatTimer = heartbeatTimerMax;

                await LobbyService.Instance.SendHeartbeatPingAsync(hostLobby.Id);
            }
        }
    }

    public async void RunServer()
    {
        try
        {
            button.Button.enabled = false;

            Allocation allocation = await RelayService.Instance.CreateAllocationAsync(maxPlayers);

            string joinCode = await RelayService.Instance.GetJoinCodeAsync(allocation.AllocationId);

            CreateLobbyOptions options = new CreateLobbyOptions
            {
                IsPrivate = false,
                Data = new Dictionary<string, DataObject>
                {
                    { "joinCode", new DataObject(DataObject.VisibilityOptions.Member, joinCode) }
                }
            };

            hostLobby = await LobbyService.Instance.CreateLobbyAsync(lobbyName, maxPlayers, options);

            Debug.Log(joinCode);

            RelayServerData relayServerData = new RelayServerData(allocation, "dtls");
            NetworkManager.Singleton.GetComponent<UnityTransport>().SetRelayServerData(relayServerData);

            NetworkManager.Singleton.StartServer();
        }
        catch (RelayServiceException ex)
        {
            Debug.Log(ex);
            button.Button.enabled = true;
        }
    }
}