If you are using Apache web server (2.4 or above), enable these modules in httpd.conf file :
Add this setting to your httpd.conf file
ProxyPass /wss2/ ws://ratchet.mydomain.org:8888/
Use this URL in your JavaScript call when you want a WSS connection:
var ws = new WebSocket("wss://ratchet.mydomain.org/wss2/NNN");
Restart Apache web server and make sure that your Ratchet worker (web socket connection) is open before applying the settings (telnet hostname port).