Демка с чатом работает

Example.Events.Backend/Chat.cs

@@ -0,0 +1,18 @@
+using Example.Events.Shared;
+using mROA.Implementation;
+
+namespace Example.Events.Backend;
+
+public class Chat : IChat
+{
+    public void PostSymbol(string symbol, RequestContext context)
+    {
+        OnCharPosted?.Invoke(symbol, context);
+    }
+
+    public event Action<string, RequestContext>? OnCharPosted;
+
+    public void OnCharPostedExternal(string p0, RequestContext p1)
+    {
+    }
+}