Presence module in Phoenix Framework is awesome. We show you how you can use it with React to build a chat.
Deploying our new Phoenix application on Heroku
Adding lists and cards and broadcasting them through the board channel
Tracking connected board members using GenServer
Adding new board members and broadcasting results through channels
Listing and creating new boards
Setting up sockets and channels for real-time features
Handling user authentication from the front-end with React and Redux.