TMSS-1939: minor tweak

SAS/TMSS/backend/services/websocket/lib/websocket_service.py

@@ -139,8 +139,10 @@ class TMSSEventMessageHandlerForWebsocket(TMSSEventMessageHandler):
 
     def _broadcast_notify_to_clients_websocket(self, msg, clients):
         # Send a broadcast message to all ws clients passed as argument
+        json_msg = JSONdumps(msg)    # Stringify msg, so clients can parse it as JSON
+        logger.debug("Sending json on websocket to %d clients: %s", len(clients), json_msg)
         for ws in clients:
-            ws.sendMessage(JSONdumps(msg))    # Stringify msg, so clients can parse it as JSON
+            ws.sendMessage(json_msg)
 
     def _post_update_on_websocket(self, pk, object_type, action):
         # Get WS clients authorised to get object changes information