Connection failed with communication PC - NXT

[Marco9x]

Hi,
I'm trying to connect to NXT, here's my code:

Code: Select all

import lejos.pc.comm.NXTComm;
import lejos.pc.comm.NXTConnector;
import lejos.nxt.*;
import lejos.nxt.remote.NXTCommand;
import lejos.pc.comm.*;

public class bluetooth {

   /**
    * @param args
    */
   public static void main(String[] args) throws Exception{
      // TODO Auto-generated method stub
      
      NXTConnector conn = new NXTConnector();
      
      if(!conn.connectTo("NXT","00:16:53:09:1a:74",NXTComm.LCP)){
         
      System.err.println("Connection failed");
      System.exit(1);
      }
      
      
      conn.close();

   }

}

i receive ever "Connection Failed"

I use eclipse with plugin for lejos.
i use lejos 9.0.1 and i have a internal device bluetooth.
Is There a problem with api lejos9.0.1?

[Marco9x]

i have already added pccomm.jar

[matthias]

Is the Robot turned on? Bluetooth/USB connected and paired with your PC?
Are you sure, that the Name and Address of the robot is correct?

Which operating system?
Do you want to connect with USB or with Bluetooth?

[gloomyandy]

Also can you connect to the NXT using nxjbrowse? What about using the standard Lego software does that work using the same system and NXT.

[Marco9x]

Robot is turned on.
I use debian.
I have configure a new device NXT on computer but i fail to pair from NXT.
I success connected with nxjbrowse via bluetooth.
i have already intalled libbluetooth-dev.

[gloomyandy]

If you can connect from nxjbrowse then you should be able to connect from your own program, it uses that same code and methods. So I suspect that there may be some sort of problem in either the address you have specified, your code, or the way you are building and running it... Are you sure you have the name and the address correct? They will be displayed by nxjbrowse when it connects.

Andy

[Marco9x]

I have seen name and address by nxjbrowse and are correct.

[skoehler]

Don't specify a name and address. (I think you have to pass null) Does it connect?

[gloomyandy]

Are you sure the name is exactly the same including upper/lower case?

[Marco9x]

i have try:

Code: Select all

if(!conn.connectTo("NXT","001653091A74",NXTComm.LCP)){
      System.err.println("connection failed");
      System.exit(1);
      }

and

Code: Select all

if(!conn.connectTo("NXT","00:16:53:09:1A:74",NXTComm.LCP)){
      System.err.println("connection failed");
      System.exit(1);
      }

and

Code: Select all

if(!conn.connectTo(null,null,NXTComm.LCP)){
      System.err.println("connection failed");
      System.exit(1);
      }

but nothing, i receive ever Connection failed.

[gloomyandy]

please copy and paste the output from running nxtbrowse exactly as it appears in the terminal window...

[Marco9x]

this is output by nxjbrowse:

marco@debian:~$ cd Scrivania/leJOS_NXJ_0.9.1beta-3/bin/
marco@debian:~/Scrivania/leJOS_NXJ_0.9.1beta-3/bin$ ./nxjbrowse
leJOS NXJ> Error: Failed to load USB comms driver.
leJOS NXJ> Caused by lejos.pc.comm.NXTCommException: Cannot load NXTComm driver
leJOS NXJ> at lejos.pc.comm.NXTCommFactory.newNXTCommInstance(NXTCommFactory.java:110)
leJOS NXJ> Caused by lejos.internal.jni.JNIException: library libjlibnxt.so was not found in /home/marco/Scrivania/leJOS_NXJ_0.9.1beta-3/bin/../lib/pc/native, architecture linux/x86
leJOS NXJ> at lejos.internal.jni.JNILoader.loadLibrary(JNILoader.java:127)

[gloomyandy]

Hi,
Ok I see the problem now. You are using this version of the connectTo method:
http://lejos.sourceforge.net/nxt/pc/api/lejos/pc/comm/NXTConnector.html#connectTo(java.lang.String,%20java.lang.String,%20int)
As the documentation states this will always connect in packet mode and the third parameter specifies what sort of transport to use (Bluetooth or USB or either) and must have values of...
NXTCommFactory.ALL_PROTOCOLS, NXTCommFactory.BLUETOOTH, or NXTCommFactory.USB
Try changing your code to be...

Code: Select all

      NXTConnector conn = new NXTConnector();
     
      if(!conn.connectTo("NXT","00:16:53:09:1a:74",NXTCommFactory.BLUETOOTH)){
         
      System.err.println("Connection failed");

and it should work. If you do want to connect using LCP mode then you need to use this version of the connectTo method:
http://lejos.sourceforge.net/nxt/pc/api/lejos/pc/comm/NXTConnector.html#connectTo(java.lang.String,%20java.lang.String,%20int,%20int)
and your code should be...

Code: Select all

]      NXTConnector conn = new NXTConnector();
     
      if(!conn.connectTo("NXT","00:16:53:09:1a:74",NXTCommFactory.BLUETOOTH,  NXTComm.LCP)){
         
      System.err.println("Connection failed");

Andy

[Marco9x]

i have modified the code but it didn't work.
Damn, i receive ever connection failed

[gloomyandy]

What does your code look like now? I tested your original code and it failed. I made the changes given above and it works. Please post the current state of your code...