After 10 Seconds Player Spawning in Unity Multiplayer

I was using Unity's built-in multiplayer system for creating a multiplayer game and I have completed my whole game work.

At present in my multiplayer game, my both players get spawned as the game get started but I want to spawn them after 10 seconds waiting.

Because I want to provide this kind of functionality in a game so I want to give some time to players.



For this reason, I have googled on multiple things and found this link:
https://docs.unity3d.com/Manual/UNetPlayersCustom.html

This way I can update the player and then attach with the network connection still two problems exist:

• there was no way exist to give 10 seconds waiting because callback get called automatically - OnServerAddPlayer
• OnServerAddPlayer method didn't get called automatically in a subclass of NetworkManager

What do I require to do for these? Here is my NetworkManager code:

Code (CSharp):

1. public class DodgelsNetworkManager : NetworkManager
2. {
3.  
4. public override void OnClientConnect (NetworkConnection connection)
5. {
6.      base.OnClientConnect (connection);
7.  
8.      GameHUDController.Instance.UpdateDebugMesssage ("\nOnClientConnect");
9.  
10.      Camera.main.SendMessage (GameConstants.ACTIVATE_NETWORK_WAITING_PANEL, true, SendMessageOptions.DontRequireReceiver);
11.      LayerScroller.stopScrolling = true;
12.  
13.      // client joined the host
14.      if (connection.connectionId > 0) {
15.  
16.          StartCoroutine (AfterDelayHideWaitingDialog ());
17.      }
18. }
19.  
20. IEnumerator AfterDelayHideWaitingDialog ()
21. {
22.      GameObject networkPlayerObj = null;
23.      while (networkPlayerObj == null) {
24.          yield return new WaitForSeconds (0.1f);
25.          networkPlayerObj = GameObject.FindGameObjectWithTag (GameConstants.TAG_HUMAN_PLAYER);
26.      }
27.  
28.      networkPlayerObj.GetComponent<NetworkPlayerController> ().HidePlayerWaitingDialog ();
29. }
30.  
31. public override void OnServerAddPlayer (NetworkConnection conn, short playerControllerId)
32. {
33.      Debug.Log ("-------------OnServerAddPlayer");
34.      GameObject player = Instantiate (playerPrefab, startPositions [conn.connectionId].position, Quaternion.identity);
35.      NetworkServer.AddPlayerForConnection (conn, player, playerControllerId);
36. }
37.  
38. }

Share your suggestions regarding this.