Added example of publishing MQTT-SN over UDP with QoS -1

Author: njh

examples/mqttsn_publish_minus_one.rb

@@ -0,0 +1,22 @@
+#!/usr/bin/env ruby
+#
+# Send a MQTT-SN Publish packet at QoS -1
+# over UDP to a MQTT-SN server
+#
+
+$:.unshift File.dirname(__FILE__)+'/../lib'
+
+require 'rubygems'
+require 'socket'
+require 'mqtt'
+
+
+socket = UDPSocket.new
+socket.connect('localhost', MQTT::SN::DEFAULT_PORT)
+socket << MQTT::SN::Packet::Publish.new(
+  :topic_id => 'TT',
+  :topic_id_type => :short,
+  :data => "The time is: #{Time.now}",
+  :qos => -1
+)
+socket.close