docs: public void shutdown() {
          /**
           * Probably we don't need this method in practice
           */
          if (initLocker.get() && shutdownLocker.compareAndSet(false, true)) {
              // do shutdown
              log.info("Shutting down transport...");
  
              // we just sending out ShutdownRequestMessage
              //transport.sendMessage(new ShutdownRequestMessage());
              transport.shutdown();
  
              executor.shutdown();
              initFinished.set(false);
              initLocker.set(false);
              shutdownLocker.set(false);
          }
      }