docs: @SuppressWarnings("unchecked")
      public void addItemEventListener(@SuppressWarnings("rawtypes") ItemEventListener listener) {
          StanzaListener conListener = new ItemEventTranslator(listener);
          itemEventToListenerMap.put(listener, conListener);
          pubSubManager.getConnection().addSyncStanzaListener(conListener, new EventContentFilter(EventElementType.items.toString(), "item"));
      }