forums.naturalpoint.com

Code: Select all

## This version doesn't work. Why not??
##    It connects to the correct server address and 
##    data port via socket.connect().
##    Motive Tracker is set to broadcast via Unicast.

import socket as socket
import struct as struct

SOCKET_BUFSIZE = 0x100000

client_address = '172.22.193.58'
server_address = '172.22.193.57' ## Motive Tracker set to Unicast
command_port = 1510
data_port = 1511

## Connect to server address
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
sock.connect((server_address, data_port)) ## <--- Using the server address
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, SOCKET_BUFSIZE)

## Set to non-blocking
sock.setblocking(0)

## The socket connects without error, but never reads any data
while True:
    try:
        ## This never reads any data
        msg, address = sock.recvfrom(SOCKET_BUFSIZE)
    except:
        pass
    else:
        print(msg, "\n")

Code: Select all

## Connect via Multicast. This version works.

import socket as socket
import struct as struct

SOCKET_BUFSIZE = 0x100000

client_address = '172.22.193.58'
server_address = '172.22.193.57' ## Motive Tracker set to Multicast
multicast_address = '239.255.42.99'
command_port = 1510
data_port = 1511

# Bind client address at data port
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
sock.bind((client_address, data_port))
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, SOCKET_BUFSIZE)
    
# Add the client IP address to the multicast group
mreq = struct.pack("=4s4s",
                    socket.inet_aton(multicast_address),
                    socket.inet_aton(client_address))
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)

# Set to non-blocking
sock.setblocking(0)

while True:
    try:
        msg, address = sock.recvfrom(SOCKET_BUFSIZE)
    except:
        pass
    else:
        print(msg, "\n")

Code: Select all

import socket as socket
import struct as struct

NATNET_PING = 0

MAX_PACKETSIZE = 100000
SOCKET_BUFSIZE = 0x100000

client_address = '172.22.193.58'
server_address = '172.22.193.57'
command_port = 1510

def ConnectCommandSocket():
    "Create a command socket."
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0)
    sock.bind((client_address, command_port))
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, SOCKET_BUFSIZE)
    sock.setblocking(0)
    return sock

commandSocket = ConnectCommandSocket()

## Send a ping command so that Tracker will begin streaming data
msg = struct.pack("I", NATNET_PING)
result = commandSocket.sendto(msg, (server_address, command_port))

while True:
    try:
        msg, address = commandSocket.recvfrom(MAX_PACKETSIZE + 4)
    except socket.error:
        pass
    else:
        print(msg, "\n")