fclient.rb

require 'rubygems'
require 'eventmachine'

module Client
  def post_init
    send_data "test_data.txt>"
    EventMachine::send_file_data @signature, "test_data.txt"
  end

  def receive_data(data)
    puts data
    close_connection_after_writing
  end

  def unbind
    puts "-- CONNECTION TERMINATED"
    EventMachine::stop_event_loop
  end
end

EventMachine::run {
  EventMachine::connect 'YOUR_SERVER_HERE', 7799, Client
}