Private chat with Socket.io, Redis on Node.js

Socket.io has a really good example how to implement a simple chat with private rooms (1:1)

1. https://socket.io/get-started/private-messaging-part-1/
2. https://socket.io/get-started/private-messaging-part-2/
3. https://socket.io/get-started/private-messaging-part-3/
4. https://socket.io/get-started/private-messaging-part-4/

Github repo https://github.com/socketio/socket.io/tree/master/examples/private-messaging