Instantly share code, notes, and snippets.

What would you like to do?
This is just meant as an example to get you started. You will need to install Twisted ("sudo easy_install twisted").
#!/usr/bin/env python
# encoding: utf-8
import socket
from struct import *
from twisted.internet.protocol import DatagramProtocol
from twisted.internet import reactor
import math
UDP_PORT=49045 # I'm not sure if there's a default so you'll have to set it like this:
UDP_SENDTO_PORT=49000 # This is the port X-Plane is listening on for commands (such as the data select packet we send to tell it what data to send us).
class XplaneConnector(DatagramProtocol):
def __init__(self):
This will send a packet to X-Plane to select the data you need to read.
Once it's sent X-Plane will output data automatically at a default of 20Hz.
In this string, "\x03\x00\x00\x00", we are selecting the third checkbox in the
"Settings" > "Data Input and Output" menu item ("speeds" in this example). And
don't forget that these numbers are in hexadecimal!
self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
self.sock.bind((UDP_IP,49999)) # this is the port we're sending from and it doesn't really matter
data_selection_packet = "DSEL0" # this is the xplane packet type
data_selection_packet += "\x03\x00\x00\x00" # airspeed
data_selection_packet += "\x04\x00\x00\x00" # accelerometers
data_selection_packet += "\x06\x00\x00\x00" # temperature
data_selection_packet += "\x11\x00\x00\x00" # gyros
data_selection_packet += "\x12\x00\x00\x00" # pitch and roll (for sanity check)
data_selection_packet += "\x14\x00\x00\x00" # altimeter and GPS
def datagramReceived(self, data, (host, port)):
We've received a UDP packet from X-Plane (which is in binary so printing it
won't help). This is where we unpack and then do whatever with the data.
# self.log() # uncomment this line if you want to log to a file
def unpack(self, data):
When we receive a UDP packet from X-Plane we'll need to unpack the data.
See for which body
axes are which (please don't invent your own). X-Plane gives some of the data
in a funny order (q before p and r?!).
self.Vair = unpack_from('<f', data, 9)[0]
self.Vtgs = unpack_from('<f', data, 9+12)[0] = unpack_from('<f', data, 9+16+36)[0] = unpack_from('<f', data, 9+20+36)[0]
self.ay = unpack_from('<f', data, 9+24+36)[0]
self.temperature = unpack_from('<f', data, 9+72+0)[0]
self.q = math.radians(unpack_from('<f', data, 9+108+0)[0])
self.p = math.radians(unpack_from('<f', data, 9+108+4)[0])
self.r = math.radians(unpack_from('<f', data, 9+108+8)[0])
self.pitch = math.radians(unpack_from('<f', data, 9+144+0)[0])
self.roll = math.radians(unpack_from('<f', data, 9+144+4)[0])
self.altitude = unpack_from('<f', data, 9+180+20)[0]
self.latitude = unpack_from('<f', data, 9+180+0)[0]
self.longitude = unpack_from('<f', data, 9+180+4)[0]
def display(self):
Use the curses library if you want to format and update the data nicely on the
screen (similar to the "top" command in *nix)
print "%f, %f, %f, %f, %f, %f, %f, %f, %f, %f" % (self.Vair,, self.ay,, self.p, self.q, self.r, self.altitude, self.latitude, self.longitude)
def log(self):
Yeah I'll get to file logging later but for now you can do it yourself (delete the "pass" line).
if __name__ == "__main__":
If you call this file directly (from the command line using "python") then
it will sleep until a packet is received and then call datagramReceived when one arrives.
print "Listening to X-Plane..."
xplane_connector = XplaneConnector()
reactor.listenUDP(UDP_PORT, xplane_connector)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment