Cycling 74 » Topic: Max MSP via internet

Max MSP via internet

Freak_Out — Sun, 26 Apr 2009 20:56:33 +0000

Hello guys

I’ve got what i think to be a very basic question, anyway…
i’m trying to communicate via my MaxMSP 5 to another computer via internet, using MaxMSP 5 as well. I’ve used a whole number of objects like mxj (with the net.tcp. class) the netsend/netreceive combination and even jit.net.send and so on. Both me and the other guy at the computer on the other side have opened relevant ports and i’ve got his ip address. which brings me to the question: should i use his EXTERNAL or LOCAL ip ? could this be the cause of the problem?(i’ve tried both, anyway…) ’cause it’s not working and it’s driving me sortof crazy…a big thank you to anyone who could solve the issue.

Re: Max MSP via internet

Jean-Francois Charles — Sun, 26 Apr 2009 23:05:45 +0000

http://www.cycling74.com/story/2006/10/23/104657/91

Maybe the section “How do I find out my IP address” could be useful.
J-F.

Re: Max MSP via internet

georghajdu@mac.com — Mon, 27 Apr 2009 09:34:30 +0000

i created an mxj object named myPublicIp which helps to give you your public IP address necessary for communication over the net. The objects gets the content of a particular website that displays your external IP address.

import com.cycling74.max.*;
import java.io.*;
import java.net.*;

public class myPublicIp extends MaxObject {

private class publicIpGetter extends Thread implements Executable {
String theLine = “test”;

public void run(){

try {
URL u = new URL(“http://myip.dk/“);
int port = 80;
Socket s = new Socket(u.getHost(), port);
OutputStream theOutput = s.getOutputStream();
PrintWriter pw = new PrintWriter(theOutput, true);
// System.out.println(u.getFile());
pw.println(“GET ” + u.getFile() + ” HTTP/1.1″);
pw.println(“Host: myip.dk”);
pw.println(“Connection: Close”);
pw.println();
// read the response
BufferedReader in = new BufferedReader(
new InputStreamReader( s.getInputStream() ));
boolean loop = true;
// StringBuffer sb = new StringBuffer(8096);

while (loop) {
if ( in.ready() ) {
// int i=0;

while ((theLine = in.readLine()) != null) {
theLine =in.readLine();
outlet(0,theLine);
// System.out.println(“cr”);
}
loop = false;
}
// Thread.currentThread().sleep(50);
}

// display the response to the out console
// outlet(0, sb.toString());
s.close();
MaxQelem q = new MaxQelem(this);
q.set();
}
catch (MalformedURLException e) {
post(“http://www.myip.dk” + ” is not a valid URL”);
}
catch (IOException e) {
// post(e);
}
}

public void execute() {
// outlet(0, theLine);
// outlet(0, “test”);

}
}

private static final String[] INLET_ASSIST = new String[]{
“inlet 1 help”
};
private static final String[] OUTLET_ASSIST = new String[]{
“outlet 1 help”
};

public myPublicIp(Atom[] args)
{
declareInlets(new int[]{DataTypes.ALL});
declareOutlets(new int[]{DataTypes.ALL});

setInletAssist(INLET_ASSIST);
setOutletAssist(OUTLET_ASSIST);

}

public void bang()
{
publicIpGetter pig = new publicIpGetter();
pig.start();
}

public void inlet(int i)
{
}

public void inlet(float f)
{
}

public void list(Atom[] list)
{
}

}

Compile the code and use the object inside the following abstraction which does post-processing of the html code. The output will be your external IP address:

– Pasted Max Patch, click to expand. –

I hope this helps,

Georg

Re: Max MSP via internet

georghajdu@mac.com — Mon, 27 Apr 2009 09:46:05 +0000

OK, just reread the post. It seems you don’t have a problem determining your friend’s IP address. You need to use his public IP address, otherwise the communication won’t work. Opening ports on the router isn’t everything. You also need to make sure that the incoming messages are forwarded to the right computer within the local network (this is called network address translation [NAT] or port forwarding). This is more tricky than you’d think. Sometimes routers just won’t work and need a firmware upgrade. Sometimes I had to put the computer into the DMZ. In any case, the router should be restarted even if the manual says otherwise. I can pride myself for eventually overcoming problems with all router, although this can be a lengthy and frustrating process.

Georg

Re: Max MSP via internet

Freak_Out — Mon, 27 Apr 2009 15:01:24 +0000

Yep, fact is, as u observed, i’m using both mine and my friend’s public ip addresses(btw, thanks for the previous reply). Just to clarify, my friend isn’t part of a local network, but in another place altogether(so we don’t have the same router etc.). I have confirmation that the ports we’re using are open and the addresses correct. can’t understand what could be wrong. i tried doing a small test again, using the netsend/netreceive combination (netsend on my computer, netreceive on his) but to no avail. Hope to fix the thing as soon as possible. Thanks again anyway.

Re: Max MSP via internet

georghajdu@mac.com — Mon, 27 Apr 2009 15:17:23 +0000

Why don’t you download my networked multimedia performance environment Quintet.net and see whether you can get it to work. There is also a Wiki that explains how to get started with all of this.

Good luck!!

http://www.quintet-net.org/dl-frames.html
http://www.georghajdu.de/quintet.net/wiki/doku.php

Georg