socket_test.rb

require 'slack'
require 'json'

Slack.configure do |config|
  config.token = "xxx"
end

auth = Slack.auth_test

client = Slack.realtime

client.on :hello do
  # Slack successfull connected ...
  puts 'Successfully connected.'
end

client.on :message do |data|
  puts data
  case data['text']
    when 'foundersbot hi'
      private_chat = Slack.im_open user: data['user'], as_user: true
      Slack.chat_postMessage channel: private_chat["channel"]["id"], text: "muschi", as_user: true
  end
end

client.on :team_join do |data|
  welcome_text = "Welcome to #founders!"
  new_member = data["user"]["id"]
  private_channel = Slack.im_open(user: new_member, as_user: true)["channel"]
  Slack.chat_postMessage channel: private_channel["id"], text: welcome_text, as_user: true
end

client.start