修改

Packages/com.unity.renderstreaming@3.1.0-exp.9/Runtime/Scripts/HostConnection.cs

@@ -324,6 +324,14 @@ namespace Unity.RenderStreaming
         public void OnMessage(SignalingEventData eventData)
         {
             Debug.Log($"[HostConnection] Message from: {eventData.connectionId}, participantId: {eventData.participantId}, message: {eventData.message}");
+            foreach (var channel in streams.OfType<DataChannelBase>().Where(c => c.Label=="on-message"))
+            {
+                if (channel != null)
+                {
+                    channel.OnMessage(eventData.message);
+                }
+            }
+
         }
 
         /// <summary>