CODEWITHSUNDEEP
unity-game-enginesslwebsockethttps
Minwoo Kim
Minwoo Kim

Reputation: 510

How can Unity connect with Secure WebSocket based on Node.js?

I created an HTTPS web server using Node.js and a socket server using WebSocket.

Both servers use the same 443 port.

For the web client, I was able to connect to the websocket server normally through the code below.

const ws = new WebSocket('wss://localhost/');
ws.onopen = () => {
  console.info(`WebSocket server and client connection`);

  ws.send('Data');
};

However, the websocket client code in Unity as shown below causes an error.

using WebSocketSharp;

...
private WebSocket _ws;

void Start()
{
  _ws = new WebSocket("wss://localhost/");
  _ws.Connect();
  _ws.OnMessage += (sender, e) =>
  {
    Debug.Log($"Received {e.Data} from server");
    Debug.Log($"Sender: {((WebSocket)sender).Url}");
  };
}

void Update()
{
  if(_ws == null)
  {
    return;
  }

  if(Input.GetKeyDown(KeyCode.Space))
  {
    _ws.Send("Hello");
  }
}

InvalidOperationException: The current state of the connection is not Open.

Is the Unity client unable to connect by inserting a Self-Signed Certificate (SSC) to configure HTTPS?

If you change to HTTP and set the port number to 80, it's confirmed that the Unity client is also connected normally.

If it's an SSL issue, how do I fix the code to enable communication?

Upvotes: 2

Views: 3721

Answers (1)

Minwoo Kim
Minwoo Kim

Reputation: 510

I found a solution to the above issue.

The code below performs the process of connecting to the WebSocket server inside the web server from the Unity client.

client.cs

using UnityEngine;
using WebSocketSharp;

public class client : MonoBehaviour
{
     private WebSocket _ws;
     
     private void Start()
     {
          _ws = new WebSocket("wss://localhost/");
          _ws.SslConfiguration.EnabledSslProtocols = System.Security.Authentication.SslProtocols.Tls12;
          
          Debug.Log("Initial State : " + _ws.ReadyState);

          _ws.Connect();
          _ws.OnMessage += (sender, e) =>
          {
               Debug.Log($"Received {e.Data} from " + ((WebSocket)sender).Url + "");
          };
     }

     private void Update()
     {
         if(_ws == null) 
         {
              return;
         }

         if(Input.GetKeyDown(KeyCode.Space))
         {
              _ws.Send("Unity data");
         }
     }
}

Upvotes: 4

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