Using Ruby sockets, because the examples in the documentation don't work at all. Simple client/server messaging example.

send.rb

#send.rb
require "socket"
message = ARGV

host = "test.wahtever.com"
port = 2000

TCPSocket.open(host, port) do |s|
  s.puts(message,0)
end

server.rb

#server.rb
require 'socket'

server = TCPServer.open(2000)
loop {
  client = server.accept
  puts client.gets
  client.close
}

Sockets example.md

Here's a little tutorial in Ruby sockets.

UDP.rb

#udp.rb
#DOS potential?
#just make message 10,000 characters long.
#scary.
  #500.times do
    UDPSocket.open() do |s|
      s.connect(host, port)
      s.send("message",0)
    end
  #end