Geoloqi Python UDP Client Demo

udp-client.py

#!/usr/bin/python
"""
A Geoloqi socket client demo.

:author: Tristan Waddington
"""
import sys
import time
import socket

from struct import pack, unpack

HOST = 'localhost'
PORT = 43333

def main():
    """
    Date (*nix), Lat, Lng, Speed, Heading, Altitude, Accuracy, Battery, UUID

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

    Python
    H = unsigned short
    I = unsigned int
    
    The first character '!' indicates network (= big-endian) should be used.
    """
    packet = '\x41'

    # Date
    packet += pack('!I', time.time())

    # Lat
    packet += pack('!I', ((45.5246 + 90) / 180) * 4294967296)

    # Lng
    packet += pack('!I', ((-122.6843 + 180) / 360) * 4294967296)

    # Speed
    packet += pack('!H', 20)

    # Heading
    packet += pack('!H', 190)

    # Altitude
    packet += pack('!H', 1320)

    # Accuracy
    packet += pack('!H', 28)

    # Battery
    packet += pack('!H', 13)

    # UUID
    packet += '\x12\x34\x56\x78\x90\xAB\xCD\xEF\x12\x34\x56\x78\x90\xAB\xCD\xEF'

    print 'Sending %s [%s]' % (packet, len(packet))

    # Initialize our socket connection
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.connect((HOST,PORT))

    # Send our packet
    sock.sendall(packet)

    # Get any response
    data = sock.recv(1024)

    # Close our socket
    sock.close()

    print 'Response: %s' % unpack('!I', data)

if __name__ == "__main__":
    try:
        sys.exit(main())
    except KeyboardInterrupt:
        print "\n"