[Bluez-devel] rfcomm in TTY raw mode from DBus

[Bluez-devel] rfcomm in TTY raw mode from DBus

[Pierre-Yves Paulus]

Hello,

How can I open an rfcomm connection into TTY raw mode from DBus? I mean,
something equivalent to the command "rfcomm --raw". Is it possible at
the moment?

I can get the rfcomm connected nicely from the DBus, I only miss how to
have it done in "raw".

Thanks,
Best Regards

Pierre-Yves Paulus




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Re: [Bluez-devel] rfcomm in TTY raw mode from DBus

[Marcel Holtmann]

Hi Pierre-Yves,

> How can I open an rfcomm connection into TTY raw mode from DBus? I mean,
> something equivalent to the command "rfcomm --raw". Is it possible at
> the moment?
> 
> I can get the rfcomm connected nicely from the DBus, I only miss how to
> have it done in "raw".

this is the job the application using that TTY. It is the same as you
need to /dev/ttyS0 etc.

Regards

Marcel



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Re: [Bluez-devel] rfcomm in TTY raw mode from DBus

[Pierre-Yves Paulus]

> > I can get the rfcomm connected nicely from the DBus, I only miss how to
> > have it done in "raw".
> 
> this is the job the application using that TTY. It is the same as you
> need to /dev/ttyS0 etc.

Thank you for your answer Marcel. After some investigation, it seems
that switching a virtual TTY into raw mode is not possible in pure JAVA
(a native call (eg JNI) to C code has to be used).

As the DBus interface is meant to be used from various languages which
may or may not have the ability to configure TTYs, wouldn't it make
sense to offer the possibility to get the TTY in one mode or the other
at the time of the DBus "connect" call? Or am  missing other important
points? To make it short, I do not understand why it is a good idea to
offer this option from the "rfcomm" utility, and not from the DBus
interface.

Any light would be appreciated!

Regards

Pierre-Yves


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Re: [Bluez-devel] rfcomm in TTY raw mode from DBus

[Marcel Holtmann]

Hi Pierre-Yves,

> > > I can get the rfcomm connected nicely from the DBus, I only miss how to
> > > have it done in "raw".
> > 
> > this is the job the application using that TTY. It is the same as you
> > need to /dev/ttyS0 etc.
> 
> Thank you for your answer Marcel. After some investigation, it seems
> that switching a virtual TTY into raw mode is not possible in pure JAVA
> (a native call (eg JNI) to C code has to be used).
> 
> As the DBus interface is meant to be used from various languages which
> may or may not have the ability to configure TTYs, wouldn't it make
> sense to offer the possibility to get the TTY in one mode or the other
> at the time of the DBus "connect" call? Or am  missing other important
> points? To make it short, I do not understand why it is a good idea to
> offer this option from the "rfcomm" utility, and not from the DBus
> interface.

the rfcomm utility has this capability, because I needed it for some
early kernel RFCOMM demonstrations. I wrote that tool back in 2002 and
in general the application should set the TTY in the needed mode. Only
cat is too stupid for this.

If Java or any other language is too stupid to handle a TTY correctly
then it also will have problems with serial ports and other TTY based
services. This is a problem of the language you choose. So in this case
you have to fix the language and not make our D-Bus API workaround these
problems.

Regards

Marcel



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Re: [Bluez-devel] rfcomm in TTY raw mode from DBus

[Pierre-Yves Paulus]

On Mon, 2006-08-28 at 21:15 +0200, Marcel Holtmann wrote:

> the rfcomm utility has this capability, because I needed it for some
> early kernel RFCOMM demonstrations. I wrote that tool back in 2002 and
> in general the application should set the TTY in the needed mode. Only
> cat is too stupid for this.

Ok.

> If Java or any other language is too stupid to handle a TTY correctly
> then it also will have problems with serial ports and other TTY based
> services. This is a problem of the language you choose. So in this case
> you have to fix the language and not make our D-Bus API workaround these
> problems.

The reason why I asked for the DBus to do so was also driven by a
mistake in my understanding of the action to be performed. Your answers
and further investigation made the point clearer for me.

The JAVA language does not completely lack the ability to manage it, as
it allows a native call to perform the task. I think the reason it does
not offer high level methods to perform this kind of task is its aim to
platform independance. But anyway, I did write a small C function and
call it using JNI, and it is working smoothly.

Thanks for your support,
Best Regards.

Pierre-Yves



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