rfcomm in TTY raw mode from DBus
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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Marcel Holtmann
maintainerHi Pierre-Yves,
Quoted 6 lines
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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Quoted 6 lines
Quoted 3 lines
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/ttyS0etc.
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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Marcel Holtmann
maintainerHi Pierre-Yves,
Quoted 10 lines
Quoted 5 lines
Quoted 2 lines
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/ttyS0etc.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).
Quoted 7 lines
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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Quoted 4 lines · Marcel Holtmann
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.
Quoted 5 lines
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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