def create_fix_message(
tracking_key, time, latitude=None, longitude=None,
track=None, ground_speed=None, airspeed=None, altitude=None,
vario=None, enl=None):
"""Send a fix packet.
Keyword arguments:
tracking_key int - base16-ecoded
time milliseconds of day
latitude angle in microdegrees
longitude angle in microdegrees
track track in degrees
ground_speed in m/s
airspeed in m/s
altitude in m
vario in m/s
enl 0-999
"""
flags = 0
if latitude is None or longitude is None:
latitude = 0
longitude = 0
else:
latitude *= 1000000
longitude *= 1000000
flags |= FLAG_LOCATION
if track is None:
track = 0
else:
flags |= FLAG_TRACK
if ground_speed is None:
ground_speed = 0
else:
ground_speed *= 16
flags |= FLAG_GROUND_SPEED
if airspeed is None:
airspeed = 0
else:
airspeed *= 16
flags |= FLAG_AIRSPEED
if altitude is None:
altitude = 0
else:
flags |= FLAG_ALTITUDE
if vario is None:
vario = 0
else:
vario *= 256
flags |= FLAG_VARIO
if enl is None:
enl = 0
else:
flags |= FLAG_ENL
message = struct.pack(
'!IHHQIIiiIHHHhhH', MAGIC, 0, TYPE_FIX, tracking_key,
flags, int(time), int(latitude), int(longitude), 0, int(track),
int(ground_speed), int(airspeed), int(altitude),
int(vario), int(enl))
return set_crc(message)
def create_ping_message(ping_id):
message = struct.pack('!IHHQHHI', MAGIC, 0, TYPE_PING,
0, ping_id, 0, 0)
return set_crc(message)
