Proof of concept of ruby socket programming.

tcp-server.rb

#!/usr/bin/ruby

require 'socket'

port = 2008

puts "Starting up server. You can connect by running 'nc localhost #{port}'."

server = TCPServer.new(port)

while (session = server.accept)

 ## Here we will establish a new thread for a connection client
 Thread.start do
   ## I want to be sure to output something on the server side
   ## to show that there has been a connection
   puts "Connection from #{session.peeraddr[2]} at #{session.peeraddr[3]}"

   ## lets see what the client has to say by grabbing the input
   ## then display it. Please note that the session.gets will look
   ## for an end of line character "\n" before moving forward.
   input = session.gets
   puts "client: #{input}"

   # respond with a welcome message
   session.puts "Server: Welcome #{session.peeraddr[2]}\n"
   # falling out of the Thread block terminates the session
   puts "Sending goodbye"
   session.puts "Server: Goodbye\n"
 end
end

__END__
See resources:

  http://www.tutorialspoint.com/ruby/ruby_socket_programming.htm
  https://www6.software.ibm.com/developerworks/education/l-rubysocks/l-rubysocks-a4.pdf
  https://github.com/eventmachine/eventmachine/wiki/Code-Snippets
  https://gist.github.com/sandro/1192557