app.rb

require 'rubygems'
require 'blather/client'

setup '[email protected]', '......'

# Auto approve subscription requests
subscription :request? do |s|
  write_to_stream s.approve!
end

# Echo back what was said
message :chat?, :body do |m|
  write_to_stream m.reply
end

Gemfile

source 'http://rubygems.org'

gem 'blather'
gem 'foreman'

Procfile

bot: bundle exec ruby app.rb

pushing:

heroku create --stack cedar
git push heroku master
heroku ps:scale bot=1
heroku ps