Socket servers are in sockets/. There's a Sinatra site with pages that listen to different socket servers.
Start one or more socket server examples.
ruby sockets/multicast.rb
Based on http://github.com/ismasan/websockets_examples.git
Start the site:
rackup -p 3000
Navigate to localhost:3000. You should see an index of available examples.
You'll need the Bundler gem installed to manage dependencies.
gem install bundler
Now you can clone and install dependencies
git clone http://github.com/damianmarti/websocket-examples
cd websocket_examples
bundle install