Single Player Fallback (Forge Networking)

SinglePlayerFallback.cs

namespace Goliath.Networking
{
    #region Dependencies

    using BeardedManStudios.Forge.Networking;
    using BeardedManStudios.Forge.Networking.Unity;
    // other usings
    using UnityEngine;

    #endregion

    public class SinglePlayerFallback : MonoBehaviour
    {
        [SerializeField]
        public GameObject _networkManager = null;

        private void Start()
        {
            if (NetworkManager.Instance == null)
            {
                Debug.LogWarning("No network instance detected - reverting to single player");

                UDPServer server = new UDPServer(0);
                server.Connect();
                server.StopAcceptingConnections();

                var mgr = Instantiate(_networkManager).GetComponent<NetworkManager>();
                mgr.Initialize(server);
                NetworkObject.Flush(server);

                // spawn required systems and delete existing ones which aren't required
                NetworkManager.Instance.InstantiatePlayerSlots();
                // do other setup logic that is normally done by the lobby scene
            }

            // do stuff here that I want done in any scene, i.e. instantiate my "GameManager", "Player" or whatever

            // tidy up
            Destroy(gameObject);
        }
    }
}