How to get message delay?

Hi, please answer this question for me, I already googled everything and cant find an answer. I need to do a simple thing but nothing worked.

I want to implement prediction into my game because everything has a delay on the client. For this I need to get the time between sending a message and recieving it.

1. How do I find out how long ago the command was sent inside a [Command] method on the server?
2. How do I find out how long ago an Rpc was sent inside a [ClientRpc] method on the client?

Ill explain by two examples.

1. In my game, the client sends a Command that he started charging a punch. By the time the server recieves the message, the client has already charged for 0.2 (network delay) seconds, but the server thinks it is 0 seconds. I could fix the problem by setting the Chargetime to 0.2 (delay) but how do I find the delay?

float messageDelay = ??

2. In my game client shoot projectiles that travel at 70 m/s, not hitscan. The client sends a command to the server that he shot a projectile at a position. But by the time the server recieves thr message, the projectile is already somewhere else on the client. I need to push it forward depending on the network delay.

please help, thanks

 

You want lag compensation?
https://twotenpvp.github.io/lag-compensation-in-unity.html

But to calculate the delay. You need to use the LLAPI methods.

 

Thanks, I read a bit about the LLAPI. Do I have to quit using HLAPI, if I want to synchronize time? Or could I use the networkTransport just for one message to synchronize time, and keep working with the HLAPI? I need some clarification before I rewrite my whole network code (again).

 

HLAPI is a opensource C# library ontop of the LLAPI

 

I am using this script to establish a NetworkTransport connection.

https://gist.github.com/LinaAdkins/a3bc0cee6f39bfd80110

It works, but the problem is that I cant connect with the networkmanager anymore when this script runs. Any ideas why that is? The networkmanager uses another port.

 

I think that I solved the problem with a modified version of a script from zee_ola from this thread:
https://forum.unity.com/threads/how-to-sync-network-time.395809/

If you need to synchronize time, try out the script on your player object:

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4. using UnityEngine.Networking;
5.  
6. public class NetworkTimer : NetworkBehaviour
7. {
8.     public bool isNetworkTimeSynced = false;
9.  
10.     // timestamp received from server
11.     private int networkTimestamp;
12.  
13.     // server to client delay
14.     private int networkTimestampDelayMS;
15.  
16.     // when did we receive timestamp from server
17.     private float timeReceived;
18.  
19.     private float startTime;
20.  
21.     protected void Start()
22.     {
23.         if (isLocalPlayer)
24.             StartCoroutine(RequestTimeCO());
25.     }
26.  
27.     IEnumerator RequestTimeCO()
28.     {
29.         while (true)
30.         {
31.             yield return new WaitForSeconds(5);
32.             CmdRequestTime();
33.         }
34.     }
35.  
36.     [Command]
37.     private void CmdRequestTime()
38.     {
39.         int timestamp = NetworkTransport.GetNetworkTimestamp();
40.         RpcNetworkTimestamp(timestamp);
41.         Debug.Log("SERVER SEND TIME");
42.     }
43.  
44.     [ClientRpc]
45.     private void RpcNetworkTimestamp(int timestamp)
46.     {
47.         Debug.Log("CLIENT RECIEVE TIME");
48.         isNetworkTimeSynced = true;
49.         networkTimestamp = timestamp;
50.         timeReceived = Time.time;
51.  
52.         // if client is a host, assume that there is 0 delay
53.         if (isServer)
54.         {
55.             networkTimestampDelayMS = 0;
56.         }
57.         else
58.         {
59.             byte error;
60.             networkTimestampDelayMS = NetworkTransport.GetRemoteDelayTimeMS(
61.                 NetworkManager.singleton.client.connection.hostId,
62.                 NetworkManager.singleton.client.connection.connectionId,
63.                 timestamp,
64.                 out error);
65.             Debug.Log(networkTimestampDelayMS);
66.         }
67.         startTime = ((float)networkTimestamp / 1000f) +
68. ((float)networkTimestampDelayMS / 1000f);
69.     }
70.  
71.     void OnGUI()
72.     {
73.         if (!isLocalPlayer)
74.             return;
75.         GUI.color = Color.red;
76.         GUI.Label(new Rect(50, 50, 200, 200), GetServerTime().ToString());
77.     }
78.  
79.     public float GetServerTime()
80.     {
81.         return startTime + (Time.time - timeReceived);
82.     }
83. }
84.