When is the state of the session set to connected when requestSession is established?

[zhangzsan]

As the title says

[louaybassbouss]

When the connection is ready to send and receive messages

[zhangzsan]

When the connection is ready to send and receive messages

Actually when request a presentation session by use the example:

var presentation = navigator.presentation;
var session = presentation.requestSession("my.html");

session.onstatechange = function() {
switch (session.state) {
case 'connected':
session.postMessage(/.../);
session.onmessage = function() { /.../ };
break;
case 'disconnected':
console.log('Disconnected.');
break;
}
};

The code above is to get connection, i think
when execute session.onstatechange, none of the code in the body of the method executes.
Expected to get session.state to execute switch (session.state) but not.