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Assets/Script/WebRtc/MessageChannel.cs

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+// Assets/Script/MessageChannel.cs
+using System;
+using System.Text;
+using UnityEngine;
+
+namespace Unity.RenderStreaming
+{
+    public class MessageChannel : DataChannelBase
+    {
+        public event Action<string, string> OnMessageReceived; // connectionId, message
+
+        protected override void OnMessage(byte[] bytes)
+        {
+            try
+            {
+                string json = Encoding.UTF8.GetString(bytes);
+                Debug.Log($"[MessageChannel] Received: {json}");
+                OnMessageReceived?.Invoke(ConnectionId, json);
+            }
+            catch (Exception e)
+            {
+                Debug.LogError($"[MessageChannel] Parse error: {e.Message}");
+            }
+        }
+    }
+}

Assets/Script/WebRtc/MessageChannel.cs.meta

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