Update app.py

app.py

@@ -50,12 +50,13 @@ def handle_subscribe(data):
     else:  
         emit("status", {"msg": "Invalid room or not in this room."}, room=sid)  
   
-@socketio.on("chat")  
-def handle_chat(data):  
-    room = data.get("room")  
-    msg  = data.get("msg")  
-    if room in ROOMS:  
-        emit("chat", {"msg": msg}, room=room)  
+@socketio.on("chat")
+def handle_chat(data):
+    room = data.get("room")
+    msg  = data.get("msg")
+    sid  = data.get("sid") or request.sid
+    if room in ROOMS:
+        emit("chat", {"msg": msg, "sid": sid}, room=room)
   
 @socketio.on("leave")  
 def handle_leave(data):