spring web socket server and react client - spring

Question

i have to develop a web socket server with spring that send to the client a message avery 5 sec. The client is written in react js. This is my server code:
#SpringBootApplication
#EnableAsync
#EnableScheduling
public class TestwsApplication {
public static void main(String[] args) {
SpringApplication.run(TestwsApplication.class, args);
}
}
#Configuration
#EnableWebSocketMessageBroker
public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
#Override
public void configureMessageBroker(MessageBrokerRegistry config) {
config.enableSimpleBroker("/topic");
}
#Override
public void registerStompEndpoints(StompEndpointRegistry registry) {
registry.addEndpoint("/chatWS").setAllowedOrigins("*").withSockJS();
}
This is my scheduler that send to the channel /topic/message a message every 5 sec
#Component
public class ScheduledTasks {
#Autowired
WebSocketListener listener;
int i=0;
private static final Logger log = LoggerFactory.getLogger(ScheduledTasks.class);
private static final SimpleDateFormat dateFormat = new SimpleDateFormat("HH:mm:ss");
#Scheduled(fixedRate = 5000)
public void reportCurrentTime() {
if (i==0){
listener.pushSystemStatusToWebSocket("ok");
i=1;
}else{
listener.pushSystemStatusToWebSocket("errore");
i=0;
}
}
}
This is my service used by the scheduler to send the message to the clients
#Service
public class WebSocketListener {
#Autowired
private SimpMessagingTemplate webSocket;
#Async
public void pushSystemStatusToWebSocket (String newStatus){
System.out.println("inviooooooooooooooooooooooooooo");
webSocket.convertAndSend("/topic/messages", newStatus);
}
}
This is my react component
import SockJS from 'sockjs-client';
class Main extends React.Component {
constructor() {
super();
this.state = {
clickCount: 0,
};
}
componentDidMount(){
// this is an "echo" websocket service
console.log('didmount')
var sock = new SockJS('http://localhost:8080/chatWS');
sock.onopen = function() {
console.log('open socket ');
sock.send('test');
};
sock.onmessage = function(e) {
console.log('message');
console.log('message', e.data);
sock.close();
};
sock.onclose = function() {
console.log('close');
};
}
on the log i see only the post open socket ... i dont see any log inserted in onmessage... so the client did not receive the message. Why ? Can you help me ?
Thanks
Esoni