Spring websocket Server and unity3d client - spring

Question

i'm using the spring web socket , it's a chat web socket app, every user msg will be delivered to all users, this below my home.html
function connect() {
var socket = new SockJS('http://192.168.1.115:8080/ROOT/hello');
stompClient = Stomp.over(socket);
stompClient.connect({}, function(frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/greetings', function(greeting) {
console.log(greeting);
console.log("greetinggggggggg");
showGreeting(JSON.parse(greeting.body).content);
});
});
}
function disconnect() {
if (stompClient != null) {
stompClient.disconnect();
}
setConnected(false);
console.log("Disconnected");
}
function sendName() {
var name = document.getElementById('name').value;
stompClient.send("/app/hello", {}, JSON.stringify({
'name' : name
}));
}
I want to use a unity3d app as client, actually i'm using socket io to connect to a web socket endpoint.
socket io link on assets store https://www.assetstore.unity3d.com/en/#!/content/21721
i could connect to the endpoint but i could not find how to subscribe to /topic/greetings as
stompClient.subscribe('/topic/greetings', function(greeting){
console.log(greeting);
console.log("greetinggggggggg");
showGreeting(JSON.parse(greeting.body).content);
});
});
Thanks