code: public byte[] generateGossipHello() {
  		if (cachedHelloMessage != null) {
  			return cachedHelloMessage;
  		}
  		try {
  			FastBuildTree root = new FastBuildTree(4);
  			root.putUnsafe("ver", ServiceBroker.PROTOCOL_VERSION);
  			root.putUnsafe("sender", nodeID);
  			if (useHostname) {
  				root.putUnsafe("host", getHostName());
  			} else {
  				root.putUnsafe("host", InetAddress.getLocalHost().getHostAddress());
  			}
  			root.putUnsafe("port", reader.getCurrentPort());
  			cachedHelloMessage = serialize(PACKET_GOSSIP_HELLO_ID, root);
  		} catch (Exception error) {
  			throw new MoleculerError("Unable to create HELLO message!", error, "MoleculerError", "unknown", false, 500,
  					"UNABLE_TO_CREATE_HELLO");
  		}
  		return cachedHelloMessage;
  	}
docs: Create Gossip HELLO packet. Hello message is invariable, so we can cache
  it.
  
  @return created "hello" request