This is a version of the Play websockets chat sample that uses redis pub/sub to allow for a single chatroom that works across multiple nodes.
The application requires a Redis connection. This is configured in applicaiton.conf:
# Redis configuration
redis.uri=${REDISCLOUD_URL}
Set the URL into an environment variable or delete this line to run Redis locally on the default port.
Once setting up Redis you can run with
$ play run
$ heroku create --buildpack https://github.com/jamesward/heroku-buildpack-scala.git
$ heroku labs:enable websockets
$ heroku addons:add rediscloud
$ git push heroku master
$ heroku open