udp-client.rb

require 'rubygems'
require 'socket'  
socket = UDPSocket.new

# Encode Latitude (((latitude + 90) / 180) * 4294967296)
# Encode Longitude (((longitude + 180) / 360) * 4294967296)

# Decode Latitude (((latitude / 4294967296) * 180) - 90)
# Decode Longitude (((longitude / 4294967296) * 360) - 180)

# Valid packet
socket.send("\x41" + 
  # Date
  [Time.now.to_i].pack('N') + 
  # Latitude
  [(((45.5246 + 90) / 180) * 4294967296)].pack('N') + 
  # Longitude
  [(((-122.6843 + 180) / 360) * 4294967296)].pack('N') + 
  # Speed          Heading           Altitude           Accuracy         Battery
  [20].pack('n') + [190].pack('n') + [1320].pack('n') + [28].pack('n') + [97].pack('n') + 
  # UUID
  "\x12\x34\x56\x78\x90\xAB\xCD\xEF\x12\x34\x56\x78\x90\xAB\xCD\xEF", 0, 'localhost', 43333)
response, sender = socket.recvfrom(4)
puts "Response: " + response.unpack('N')[0].to_s

# Wrong UUID length
socket.send("\x41" + 
  # Latitude
  [(((45.5246 + 90) / 180) * 4294967296)].pack('N') + 
  # Longitude
  [(((-122.6843 + 180) / 360) * 4294967296)].pack('N') + 
  # Speed          Heading           Altitude           Accuracy         Battery
  [20].pack('n') + [190].pack('n') + [1320].pack('n') + [28].pack('n') + [97].pack('n') + 
  # UUID
  "\x34\x56\x78\x90\xAB\xCD\xEF\x12\x34\x56\x78\x90\xAB\xCD\xEF", 0, 'localhost', 43333)
response, sender = socket.recvfrom(4)
puts "Response: " + response.unpack('N')[0].to_s

# Wrong message length
socket.send("\x41" + 
  # Date
  [Time.now.to_i].pack('N') + 
  # Latitude
  [(((45.5246 + 90) / 180) * 4294967296)].pack('N') + 
  # Longitude
  [(((-122.6843 + 180) / 360) * 4294967296)].pack('N') + 
  # Speed          Heading           Altitude           Accuracy         Battery
  [20].pack('n') + [190].pack('n') + [1320].pack('n') + [28].pack('n') + 
  # UUID
  "\x12\x34\x56\x78\x90\xAB\xCD\xEF\x12\x34\x56\x78\x90\xAB\xCD\xEF", 0, 'localhost', 43333)
response, sender = socket.recvfrom(4)
puts "Response: " + response.unpack('N')[0].to_s