Very Basic EM Echo Server

3_echo_server.rb

require 'rubygems'
require 'eventmachine'

class EchoServer < EM::Connection
  def post_init
    puts "-- someone connected to the echo server!"

    EM.add_periodic_timer 5 do
      send_data "Foo Bar"
    end
  end

  def receive_data data
    send_data ">>> you sent: #{data}"
  end
end

EventMachine::run do
  EventMachine::start_server "127.0.0.1", 8081, EchoServer
  puts 'running echo server on 8081'
end