WorldViz User Forum - Real-time export data to simulink

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whj	08-31-2009 03:55 PM

Real-time export data to simulink

Hello,

I'm seeking a solution to output position and orientation data to another computer running Simulink in real time. Does anybody have any experience?

Thanks!

farshizzo

09-03-2009 05:48 PM

Can Simulink read data coming over a network socket? If so, you can use the Python socket module to send data over the network.

whj	09-04-2009 10:32 AM

I found a UDP Receive block in Simulink. It requires the other end of the communication, which is vizard, to specify the port that receives data. I'm not sure how to do it. I think my code only specifies the port that sends data. Am I missing something?

Code:

import viz

viz.go()



import socket



COMPUTER_IP_ADDRESS = socket.gethostbyname('192.59.88.91')



PORT = 25000 #The port to send data on



OutSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

OutSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)



def SendData(data):

        OutSocket.sendto(data,(COMPUTER_IP_ADDRESS,PORT))



vizact.onkeydown(' ',SendData,'hello there')

Thanks!

farshizzo

09-04-2009 05:29 PM

This post shows how to send and receive data on UDP sockets using different ports.

whj	09-05-2009 09:49 PM

I'm confused, in the sample code, there is only one port 4999, which is "#The port to send/receive data on". Why does it show using different ports? Thanks.

whj	09-08-2009 01:51 PM

So far I'm sure simulink on computer B can receive data from specified IP address and port over UDP. Then my question is, how do I specify the port that the remote computer B accepts data from in vizard on this computer A? Thanks.

whj	09-08-2009 03:31 PM

I just got them communicated successfully. PORT = xxxx seems to be used to specify the remote port to receive from. Please forget my previous question.

My next problem is I would like to send two values from vizard to simulink every 0.05 second. My code would be like this:

Code:

import viz

viz.go()



import socket

import random



COMPUTER_IP_ADDRESS = '129.59.82.229'

PORT = 25000 

OutSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

OutSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)



def SendData(data):

        OutSocket.sendto(data,(COMPUTER_IP_ADDRESS,PORT))



def mytimer(num):

        value1 = random.randint(0, 70)

        value2 = random.randint(1, 100)

        SendData(value1, value2)





viz.callback(viz.TIMER_EVENT, mytimer)

viz.starttimer(0,0.05,viz.FOREVER)

I know SendData(value1, value2) wouldn't work. Could somebody tell me how to use SendDate at this context.

Thanks a lot.

farshizzo

09-09-2009 01:16 PM

When sending data using the socket module, the data needs to be a string containing the raw byte data. Have a look at the Python struct module for packing Python integer/float values into raw byte data. The following example shows how to generate raw byte data from 2 integer values:

Code:

import struct

data = struct.pack('ii',value1,value2)

whj	09-11-2009 10:33 AM

Thanks a lot. That really helps.

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