code: public void onOOBControlMessage(IMessageComponent source, IPipe pipe, OOBControlMessage oobCtrlMsg) {
          String target = oobCtrlMsg.getTarget();
          if ("ClientBroadcastStream".equals(target)) {
              String serviceName = oobCtrlMsg.getServiceName();
              if ("chunkSize".equals(serviceName)) {
                  chunkSize = (Integer) oobCtrlMsg.getServiceParamMap().get("chunkSize");
                  notifyChunkSize();
              } else {
                  log.debug("Unhandled OOB control message for service: {}", serviceName);
              }
          } else {
              log.debug("Unhandled OOB control message to target: {}", target);
          }
      }
docs: Out-of-band control message handler
  
  @param source
  OOB message source
  @param pipe
  Pipe that used to send OOB message
  @param oobCtrlMsg
  Out-of-band control message