Simple node.js UDP client written in CoffeScript which connects to an UDP server, sends a message, waits for a response, prints it and finally closes the connection.

gistfile1.coffee

##
# Simple node.js UDP client written in CoffeScript which
# connects to an UDP server, sends a message, waits for a
# response, prints it and finally closes the connection.
#
# Copyright (c) Jesús Pérez
# Licensed under GPLv3 - http://www.gnu.org/licenses/gpl-3.0.html
##

dgram = require "dgram"


# server info and message
targetPort = <SERVER_PORT>
targetIp = <SERVER_IP>
message = new Buffer "My KungFu is Good!"

# UDP socket is created
client = dgram.createSocket "udp4"

# event to log each received packet
client.on "message", (msg, rinfo) ->
	console.log "client got: " + msg + " from " + rinfo.address + ":" + rinfo.port
	# close the connection
	client.close()

# message is sent
client.send message, 0, message.length, targetPort, targetIp, (err, bytes) ->
	throw err  if err
	console.log "UDP message sent to " + targetIp + ":" + targetPort
	console.log "content: " + message
	# close the connection
	#client.close()