connection.onleave() event is not raised after participant disconnection about rtcmulticonnection HOT 2 OPEN

connection.ondisconnected = function (event) {
    log('Peer connection seems has been disconnected between you and', event.userid);

    if (isEmpty(connection.channels)) return;
    if (!connection.channels[event.userid]) return;

    // use WebRTC data channels to detect user's presence
    connection.channels[event.userid].send({
        checkingPresence: true
    });

    // wait 5 seconds, if target peer didn't response, simply disconnect
    setTimeout(function () {
        // iceConnectionState == 'disconnected' occurred out of low-bandwidth
        // or internet connectivity issues
        if (connection.peers[event.userid].connected) {
            delete connection.peers[event.userid].connected;
            return;
        }

        // to make sure this user's all remote streams are removed.
        for (var stream in connection.streams) {
            stream = connection.streams[stream];
            if (stream.userid == event.userid && stream.type == 'remote') {
                connection.onstreamended(stream.streamObject);
            }
        }

        connection.remove(event.userid);
    }, 5000);
};

connection.onconnected = function (event) {
    event.peer.onCustomMessage = function (message) {
        if (message.areYouThere) {
            event.peer.sendCustomMessage({
                yesIAmThere: true
            });
        }

        if (message.yesIAmThere) {
            connection.peers[event.userid].connected = true;
        }
    };
};


connection.ondisconnected = function (event) {
    event.peer.sendCustomMessage({
        areYouThere: true
    });

    // wait 5 seconds, if target peer didn't response, simply disconnect
    setTimeout(function () {
        // iceConnectionState == 'disconnected' occurred out of low-bandwidth
        // or internet connectivity issues
        if (connection.peers[event.userid].connected) {
            delete connection.peers[event.userid].connected;
            return;
        }

        // to make sure this user's all remote streams are removed.
        for (var stream in connection.streams) {
            stream = connection.streams[stream];
            if (stream.userid == event.userid && stream.type == 'remote') {
                connection.onstreamended(stream.streamObject);
            }
        }

        connection.remove(event.userid);
    }, 5000);
};