* Re: [Bluez-devel] Re: help with bluetooth on linux
2005-05-12 22:56 ` [Bluez-devel] Re: help with bluetooth on linux Jean Tourrilhes
@ 2005-05-13 5:37 ` Jack Jia
2005-05-13 14:40 ` Gabriel Marques
1 sibling, 0 replies; 3+ messages in thread
From: Jack Jia @ 2005-05-13 5:37 UTC (permalink / raw)
To: BlueZ mailing list
You can do anything with Java. In Java, everything is pointer and all the
functions are virtual, and from language point of view it is cooler than
C/C++. Finally, everything will go to 0s and 1s, but it is NOT cool to use
them directly. People who don't like Java are usually not good C/C++
programmers.
Jack
On Thu, 12 May 2005, Jean Tourrilhes wrote:
> On Thu, May 12, 2005 at 04:02:50PM -0300, Gabriel Marques wrote:
>> Hi, I've found your e-mail in a "how to" about "Brainboxes BlueTooth +
>> Linux Howto".
>> The tutorial is helping a lot but I still got some problems, and I was
>> hoping you could help me out with any information.
>> In my work (with JavaTV) I need to set up a communication channel over a
>> BT device, using an open-source Java BT stack.
>
> That's typical of the Java people, they want to rewrite the
> whole OS in Java. This only lead to lot of duplicated code,
> interoperability problem and madness. Please use the OS existing BT
> stack, don't rewrite your own.
> Let suppose your Java programe use a Java BT stack, and you
> want both your Java program and a regular C/C++ program (BT
> mouse/audio driver) to use BT, how do you make that work. You can't.
>
>> JavaBluetooth relies on a serial/tty abstraction of the HCI layer (H4),
>> and works fine with serial (RS232) BT dongles.
>> But those are hard and expensive to find, and all I have is two USB
>> dongles. One is a 3com and the other came from china.
>> Well, my problem is: *How to make JavaBluetooth work with an USB dongle*
>
> Don't. It's a waste of time.
> The proper question is : how do I access in Java the existing
> BT stack of Linux that is fully debugged and fully functional.
>
>> I've installed Fedora Linux (kernel 2.6.11-1.14_FC3), and the USB dongle
>> was recognized automatically, its running fine trough BlueZ.
>> can you help me with some steps on putting the usb_bt>serial_bt driver
>> to work?
>
> No, what you need to do is to create a JNI enabling your Java
> program to access the BlueZ APIs. The BlueZ APIs are all sockets of
> various types, and most likely you only need one or two types, so this
> is not as bad as it looks like. Yeah, it's a shame that writting JNI
> is so messy, SUN should improve that.
> If you want an example of such JNI, you can look at the
> Java-IrDA API done be a collegue of mine. That's the right way to do
> it.
> Actually, somebody might have already done that, so ask around...
>
> Regards,
>
> Jean
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by Oracle Space Sweepstakes
> Want to be the first software developer in space?
> Enter now for the Oracle Space Sweepstakes!
> http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-devel
>
-------------------------------------------------------
This SF.Net email is sponsored by Oracle Space Sweepstakes
Want to be the first software developer in space?
Enter now for the Oracle Space Sweepstakes!
http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bluez-devel] Re: help with bluetooth on linux
2005-05-12 22:56 ` [Bluez-devel] Re: help with bluetooth on linux Jean Tourrilhes
2005-05-13 5:37 ` Jack Jia
@ 2005-05-13 14:40 ` Gabriel Marques
1 sibling, 0 replies; 3+ messages in thread
From: Gabriel Marques @ 2005-05-13 14:40 UTC (permalink / raw)
To: BlueZ mailing list
First of all, thanks for answering my questions, but there was a
misundertanding here.
And sorry if my questions created a Java vs. C battle.
Comments are in line:
Jean wrote:
>On Thu, May 12, 2005 at 04:02:50PM -0300, Gabriel Marques wrote:
>
>
>>Hi, I've found your e-mail in a "how to" about "Brainboxes BlueTooth +
>>Linux Howto".
>>The tutorial is helping a lot but I still got some problems, and I was
>>hoping you could help me out with any information.
>>In my work (with JavaTV) I need to set up a communication channel over a
>>BT device, using an open-source Java BT stack.
>>
>>
>
> That's typical of the Java people, they want to rewrite the
>whole OS in Java. This only lead to lot of duplicated code,
>interoperability problem and madness. Please use the OS existing BT
>stack, don't rewrite your own.
>
>
Hehe, I'm not a Java addict who wants to rewrite the OS in java.
I'm writing applications for set-top boxes (DTV receivers), they only
run Java (well, for the manufacturer they run RTLinux or something), and
have no BT implementation.
The only return channel they provide is a phone modem, or sometimes
something that the manufacturer implements, and a serial port, that is
used for debugging and Java apps. loading.
Since I can't force the manufacturers to provide me a bluetooth return
channel, but I can ask them to open acess to the serial port, the
solution I found is to plug a serial BT dongle on it.
That implies in implementing the stack in Java. I totally agree that
this is a task for C or even hardware to implement, but for business
reasons, I have to validate some prototypes with BT so that maybe,
someday, the Java API will be implemented in the OS.
Well, thats the future, for now, I have to make a Java BT stack talk to
a serial BT device, implement some apps. over it, so that in sequence I
can port it tho some set-tops.
Windows is way too restrictive to this phase of developing, so I'm using
linux, but I can't send questions to the BlueZ forums, cause it's
off-topic. (actually I already tried :) )
> Let suppose your Java programe use a Java BT stack, and you
>want both your Java program and a regular C/C++ program (BT
>mouse/audio driver) to use BT, how do you make that work. You can't.
>
>
>
That won't happen, the only apps. that will use the BT will be java
ones, and once the Java API is valid, it wil probably be implemented by
the set-top OS/hardware.
>>JavaBluetooth relies on a serial/tty abstraction of the HCI layer (H4),
>>and works fine with serial (RS232) BT dongles.
>>But those are hard and expensive to find, and all I have is two USB
>>dongles. One is a 3com and the other came from china.
>>Well, my problem is: *How to make JavaBluetooth work with an USB dongle*
>>
>>
>
> Don't. It's a waste of time.
>
>
True, but what can I do, it comes with the package :)
> The proper question is : how do I access in Java the existing
>BT stack of Linux that is fully debugged and fully functional.
>
>
>
>>I've installed Fedora Linux (kernel 2.6.11-1.14_FC3), and the USB dongle
>>was recognized automatically, its running fine trough BlueZ.
>>can you help me with some steps on putting the usb_bt>serial_bt driver
>>to work?
>>
>>
>
> No, what you need to do is to create a JNI enabling your Java
>program to access the BlueZ APIs. The BlueZ APIs are all sockets of
>various types, and most likely you only need one or two types, so this
>is not as bad as it looks like. Yeah, it's a shame that writting JNI
>is so messy, SUN should improve that.
> If you want an example of such JNI, you can look at the
>Java-IrDA API done be a collegue of mine. That's the right way to do
>it.
> Actually, somebody might have already done that, so ask around...
>
>
I've asked around a lot before asking to you, perhaps you can indicate
some list or reference, like the IrDA one.
Thanks.
> Regards,
>
> Jean
>
>
Oh, and I've sent the last message from a wrong e-mail, I'm still
getting used to Thunderbird :)
-------------------------------------------------------
This SF.Net email is sponsored by Oracle Space Sweepstakes
Want to be the first software developer in space?
Enter now for the Oracle Space Sweepstakes!
http://ads.osdn.com/?ad_id=7393&alloc_id=16281&op=click
_______________________________________________
Bluez-devel mailing list
Bluez-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/bluez-devel
^ permalink raw reply [flat|nested] 3+ messages in thread