A simple UDP server that will receive some text, reverse it and send that as a response. Runs locally on port 1234 (127.0.0.1:1234)

simple_udp_server.rb

require 'socket'
require 'pp'

host = 'localhost'
port = 1234

s = UDPSocket.new
s.bind(nil, port)

while 1 do

  # Receive the packet
	received = s.recvfrom(100)
	puts "\t"
	puts received.class
	puts received.size
	pp received
	puts "\n"

	# save the client host and port for sending response
	client_host = received[1][2].to_s
	client_port = received[1][1].to_s

	# If the message sent was 'kill' then shut down the server
	if received[0].strip.chomp == "kill"

		puts "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
		puts "Shutting down server"
		puts "~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~"
		break

	# Else, send the message back to the client, reversed
	else
		message = received[0].reverse
		s.send(message, 0, client_host, client_port.to_i)

		print "[server #{received[1][2]} - #{received[1][1]}]"
		puts message
	end
end