Be sure to set the below to your notes.ini or the plugin won't run:
XPagesPreload=1
XPagesPreloadDB=websocket.nsf
xockets.io as of 2.0.8
-Updated core Netty library to 4.1.4
-Added event observers to fire against all connected client events (see below blog post):
http://markwambler.blogspot.com/2016/08/xocketsio-last-few-enhancements.html