Bruno Ghisi's Blog

Bruno Ghisi is a Java enthusiast with focus on Java ME, open source and wireless technologies. He is a Mobile & Embedded Community Star and Java Champion. In addition, he helps a JUG called GUJava/SC and maintains some open source projects, such as Marge. He is a new grad that intends to do a Master and currently works for CERTI Foundation. Also, he lives in an island in the south of Brazil called Florianópolis.

Marging a FX Tetris at JavaOne!

Marge (Java Bluetooth Framework) got a mini talk in Community Corner. It will be on Wednesday at 3:30 pm. If are you interested in Bluetooth, JSR 82 (Java Apis for Bluetooth) and Marge, do not miss that! We have integrated a Bluetooth mobile controller for a nice James Weaver's compiled JavaFX Script tetris game! Thanks, Jim!

Here is a preview (updated):

The old video is at http://www.youtube.com/v/ZvVx6RGjCjM

It will be easy to find Marge:

Here is the last tip, keep an eye on the Mobile and Embedded Wiki page for JavaOne!

I am very excited to meet new people! See you in San Francisco!

Bruno Ghisi

Pics from fisl 9.0

The 9th edition of fisl (International Free Software Forum) was huge! 7417 participants from 21 countries talking about open source 12 hours by day during 3 days. Wow! Great atmosphere! Great sessions! Great people! Great ideas, discussions, dinners...

Here are some pics that I got from my terrible camera:

Ale Gomes, from Mobile & Embedded, and Fabiane Nardon, JavaTools Community Leader.

Bruno Souza, Javali, Brazilian Sun Ambassadors, OpenSolaris User Group... did I forgot anyone?

Marge checking out a mobile session with her MSA compliant device!

Lucas Torri, Roger Brinkley and I. Sorry model agencies... no runways, we are busy....

What a nice guy!

Roger Brinkley, Mobile and Embedded Community leader, playing golf during his cool session!

Bluetooth about:

The slides of the session Marge, an open source framework for building Bluetooth applications in Java are available only in pt_BR (pdf and odf). mOOo Impress Controller was used to control the Impress presentation with the mobile and Giant Blue Pong was the demo showed in the end. Thanks for the audience, sorry if we had to hurry up. If you got any doubts, please send an email to us (mailing lists here).

During fisl, we have discovered a very nice thing! Bluecove, a JSR 82 Java SE implementation, is already working over BlueZ, the official Linux Bluetooth protocol stack. There is no release yet, but the snapshots we have tried are stable. Thanks to Vlad Skarzhevskyy, one of the project owners, that virtually helped us to put things working for our demo. Now you can have multiple connections in Linux, something that AvetanaBluetooth (open source) did not allow. Great news! Congrats to the Bluecove team! :)

Thanks,

Bruno Ghisi

Starting with Sun SPOT using NetBeans 6.1

If you do not have a Sun SPOT (Figure 1), do not be bored, you can still have a lot of fun! In this entry, I gonna explain how to start programming the world using NetBeans 6.1!

Figure 1: Sun SPOT rulez!!!

Downloading NetBeans IDE 6.1

Installing Sun SPOT plugin

Getting Sun SPOT SDK 3.0 Beta

Creating the Demo Application

    protected void startApp() throws MIDletStateChangeException {

        System.out.println("Hello, world");

        new BootloaderListener().start();   // monitor the USB (if connected) and recognize commands from host


        long ourAddr = Spot.getInstance().getRadioPolicyManager().getIEEEAddress();

        System.out.println("Our radio address = " + IEEEAddress.toDottedHex(ourAddr));

        ISwitch sw1 = EDemoBoard.getInstance().getSwitches()[EDemoBoard.SW1];

        leds[0].setRGB(100,0,0);                // set color to moderate red

        while (sw1.isOpen()) {                  // done when switch is pressed

            leds[0].setOn();                    // Blink LED

            Utils.sleep(250);                   // wait 1/4 seconds

            leds[0].setOff();

            Utils.sleep(1000);                  // wait 1 second

        }

        notifyDestroyed();                      // cause the MIDlet to exit

    }

Running the Demo Application in the emulator

Where I go next?

Building a Java ME Bluetooth chat in 12 minutes...

As it was announced before, Marge 0.5 is out. In this post, I am going to demonstrate an interesting new feature called AutoConnect. AutoConnect is indeed to automatically connect Bluetooth devices. It has some limitations due to some bad implementations and has some scenarios that maybe it is not the best option, but still very interesting and is definitely awesome to make something with a few lines of code! For more information about the new release and this feature, please check http://wiki.java.net/bin/view/Mobileandembedded/HowTo05.

So, nothing better than show a video... [sometimes I think I should have done cinema :) ]... Anyway, if you have not seen any Marge videos yet, try "Project Marge Interview", "My laptop is detecting my presence" and "Giant Blue Pong (my Bluetooth Atari)". Too much talk, take a look at the new "Building a Java ME Bluetooth chat in 12 minutes..." too. Could you not understand what happened in Netbeans code editor? Neither do I!!! It is better to download the full video (30MB). Hope you enjoy!

If you want more about Marge, go to http://marge.dev.java.net. If you want to help, please send an email to owner@marge.dev.java.net. We would love to hear suggestions and have you in our team!

Go ahead! Marge your Bluetooth app!

Palette Components in Visual Mobile Designer (Netbeans Mobility Pack)

Do you use Netbeans Mobility Pack? Do you always wanted to know more about all the palette components in Visual Mobile Designer (VMD)? I got an email from netbeans weekly (nbweekly@netbeans.org) with a very nice wiki page!

Original:

Visual Mobile Designer Palette Reference Page

Everything you wanted to know about the Visual Mobile Designer for mobile applications, but were afraid to ask is now revealed. This page gives a complete description of all the components in the VMD palette and includes links to related tutorials for each of the components where available. Get the information you need to make effective use of all the functionality the Mobility pack delivers!

VMD rulez! Enjoy it!

Bruno Ghisi

Anybody could explain me what is going on with Brazilian DTV?

Recently, I read Sun Microsystems And SBTVD Forum To Develop Open-Source Java Solution For Brazil's Digital TV System. Ok, looks like a nice news, but is there any reader that could explain me what is really going on?

I will try summarise my point of view, because I am not an expert on it. Brazilian open source middleware, called Ginga, is divided in two main parts: Ginga-ncl, which is uses a Brazilian scripting language called Lua (much used in embedded systems and games) and Ginga-j, which is supposed to be the Java stuff. As far as I know, Ginga-j is compatible with GEM (Globally Executable MHP) and it was having licenses and royalties problems. Also, it was being said that Ginga-j was open source, but things are not really clear, otherwise, probably, I would not being post this entry... how can you drive an open source project without clearity? Where can I download all the stuff? Where is the roadmap? So, Sun published that will help Forum do Sistema Brasileiro de TV Digital Terrestre (Forum SBTVD) to create a new plataform that will take place at Ginga. The announcement says that this platform will be compatible with Ginga, so is it a replacement for Ginga-j? How will be that?

Hope anybody could elucidate us.

Cheers,
Bruno Ghisi

My First JRuby Bluetooth App

• Download Netbeans IDE 6 (Select All package version, because it comes with Java and Ruby).
• Get marge-core in Marge repository (you can use Netbeans to checkout from Subversion and generate a jar, because the last version is under development and was not launched yet, we are working on it :) ). Otherwise download the last launched version (0.4.0) and fix the inquiry method.
• Get a JSR 82 implementation, I have used Avetana for Linux. I have explained it in another post, you can take a look here.

1. Create a Ruby Project: File -> New Project -> Ruby -> Ruby Application. Click Next, configure your project (create a main.rb file and use a JRuby interpreter) and then click Finish.
2. Add marge-core and Avetana. Right click in the project -> Properties -> Java and then add the jars in the JRuby classpath.
3. Add the following code into main.rb. The code is pretty intuitive, because Ruby is! It basically imports some Marge classes (that are going to use Avetana internally), defines a listener that will be called during the inquiry and will print all the devices found. Also, the inquiry will be started by the singleton DeviceDiscoverer.



include Java

include_class 'net.java.dev.marge.inquiry.DeviceDiscoverer'
include_class 'net.java.dev.marge.inquiry.InquiryListener'

puts 'Inquiring for Bluetooth Devices'
discoverer = DeviceDiscoverer.instance;

class InquiryListenerAppender 
    include InquiryListener
  def inquiryCompleted(remoteDevices)
    remoteDevices.each { |device| print "#{device.bluetooth_address} - #{device.get_friendly_name true} \n"  }
  end
  def inquiryError
    puts 'Inquiry Error'
  end
  def deviceDiscovered(device,deviceClass)
  end
end

discoverer.start_inquiry_giac InquiryListenerAppender.new

April 2008

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Marging a FX Tetris at JavaOne!

Pics from fisl 9.0

Starting with Sun SPOT using NetBeans 6.1

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