code: @Override
      protected void setAdditionalInfoToEventCallBackStruct(EventCallBackStruct callback_struct,
                            String device_name, String attribute, String event_name, String[] filters, EventChannelStruct channel_struct) throws DevFailed {
          // Nothing
          ApiUtil.printTrace("-------------> Set as ZmqEventConsumer for "+device_name);
          callback_struct.consumer  = this;
      }
docs: ===============================================================