[Bluez-users] rfcomm problems

[Bluez-users] rfcomm problems

[Andrew de Quincey]

Hi, I'm using linux kernel 2.6.9, gentoo, bluez-utils/libs 2.10.
I have a Nokia 3650, with firmware 3.16.

I've initially been just trying to connect to the phone using rfcomm...

rfcomm connect 0 MACADDR 1

this works - I get the "Press Ctrl-C to hangup" and /dev/rfcomm0 appears 
(using udev BTW).

I then try to use minicom on /dev/rfcomm0. It opens it OK, but nothing 
happens... I mean, I send AT commands at it, but I get no response. Do I have 
to use a certain set of serial port settings (I've tried quite a few)?

I also tried running hcidump whilst typing stuff in minicom - nothing was 
logged.

What am I missing?


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Re: [Bluez-users] rfcomm problems

[Marcel Holtmann]

Hi Andrew,

> Hi, I'm using linux kernel 2.6.9, gentoo, bluez-utils/libs 2.10.
> I have a Nokia 3650, with firmware 3.16.
> 
> I've initially been just trying to connect to the phone using rfcomm...
> 
> rfcomm connect 0 MACADDR 1
> 
> this works - I get the "Press Ctrl-C to hangup" and /dev/rfcomm0 appears 
> (using udev BTW).
> 
> I then try to use minicom on /dev/rfcomm0. It opens it OK, but nothing 
> happens... I mean, I send AT commands at it, but I get no response. Do I have 
> to use a certain set of serial port settings (I've tried quite a few)?

No. This should simply work.

However some people complained about that minicom and RFCOMM TTY do not
work very good together. The BlueZ utils packages contains test/attest.c
and you should give it a try.

> I also tried running hcidump whilst typing stuff in minicom - nothing was 
> logged.

Do you started hcidump as root? You must see at least the RFCOMM channel
setup.

Regards

Marcel




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Re: [Bluez-users] rfcomm problems

[Andrew de Quincey]

On Wednesday 24 Nov 2004 19:50, Marcel Holtmann wrote:
> Hi Andrew,
>
> > Hi, I'm using linux kernel 2.6.9, gentoo, bluez-utils/libs 2.10.
> > I have a Nokia 3650, with firmware 3.16.
> >
> > I've initially been just trying to connect to the phone using rfcomm...
> >
> > rfcomm connect 0 MACADDR 1
> >
> > this works - I get the "Press Ctrl-C to hangup" and /dev/rfcomm0 appears
> > (using udev BTW).
> >
> > I then try to use minicom on /dev/rfcomm0. It opens it OK, but nothing
> > happens... I mean, I send AT commands at it, but I get no response. Do I
> > have to use a certain set of serial port settings (I've tried quite a
> > few)?
>
> No. This should simply work.
>
> However some people complained about that minicom and RFCOMM TTY do not
> work very good together. The BlueZ utils packages contains test/attest.c
> and you should give it a try.
>
> > I also tried running hcidump whilst typing stuff in minicom - nothing was
> > logged.
>
> Do you started hcidump as root? You must see at least the RFCOMM channel
> setup.

Nice one! I've now got GPRS and everything working. I can confirm minicom just 
does not work with it.


OK: my next question is about the "Bluetooth serial port" on the phone. When I 
connect to it with:

rfcomm connect 0 00:60:57:7C:31:49 2

It connects, but then the phone immediately disconnects. A short time later,  
the phone connects back to my computer on seemingly the service with the 
highest channel id - in my case kbemusedsrv (from kdebluetooth - an XMMS 
control service for the phone).

kbemused handily has a raw data dump option, and I can see the phone sending 
what are obviously PPP LCP packets at it.

How do I get the phone to connect to something sensible - e.g. to dund. I 
found various sets of instructions on the web, but the damn thing keeps 
connecting to kbedmused. 

Is this connect-disconnect-reconnect behaviour normal?

Re: [Bluez-users] rfcomm problems

[Marcel Holtmann]

Hi Andrew,

> OK: my next question is about the "Bluetooth serial port" on the phone. When I 
> connect to it with:
> 
> rfcomm connect 0 00:60:57:7C:31:49 2
> 
> It connects, but then the phone immediately disconnects. A short time later,  
> the phone connects back to my computer on seemingly the service with the 
> highest channel id - in my case kbemusedsrv (from kdebluetooth - an XMMS 
> control service for the phone).
> 
> kbemused handily has a raw data dump option, and I can see the phone sending 
> what are obviously PPP LCP packets at it.
> 
> How do I get the phone to connect to something sensible - e.g. to dund. I 
> found various sets of instructions on the web, but the damn thing keeps 
> connecting to kbedmused. 
> 
> Is this connect-disconnect-reconnect behaviour normal?

welcome to the world of this mRouter crap. You can try the latest dund
from bluez-utils-2.11 package. I added some support for mRouter, but I
am not sure if it is really working.

Regards

Marcel




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[Bluez-users] Rfcomm Problems

[Thomas Brandl]

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Hallo;

I have a problem concerning rfcomm conenction. Hopefully somebody can help me ;-))

Following Problem: 

After 
sdptool add --channel=2 SP, and
rfcomm listen rfcomm0 (I put it in an infinite loop so that reconnection will establish automatically)
I am waiting for an incoming connection. This connection is availiable after a few seconds. So no problems so far. 

My problem now. 
I have an application listening on rfcomm0, if something happens that causes an disconnection (with following reconnection) my apllication is not be able to receive from dev/rfcomm0 

You can test it with simple cat /dev/rfcomm0. After disconnection cat is closing. 
I need that cat /dev/rfcomm0 is kept open. Would it be possible to link to a specific script which is able to handle this?? Any other proposals??

Thanks

Thomas 

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Re: [Bluez-users] Rfcomm Problems

[Albert Huang]

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>
> I need that cat /dev/rfcomm0 is kept open.
>

To my knowledge, this is not currently possible.  Anyone?

-albert

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Re: [Bluez-users] Rfcomm Problems

[Sowmya Gattupalli]

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Hey Albert,
Even  have some rfcomm problems.... whenever I use rfcomm-server and
rfcomm-client ( the sample code in ur site) many times... I get this
Resource temporarily unavailable and I need to restart the machine.....

Is it because of ISSC chipset.... or am I missin somethin?

On 4/29/06, Albert Huang <albert@csail.mit.edu> wrote:
>
> I need that cat /dev/rfcomm0 is kept open.
> >
>
> To my knowledge, this is not currently possible.  Anyone?
>
> -albert
>

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Re: [Bluez-users] Rfcomm Problems

[Thomas Brandl]

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is it maybe possible to create a script, which can simulate that open device file. at that moment i don't know how, but i think there should be any solution.

greetings

thomas
  ----- Original Message ----- 
  From: Albert Huang 
  To: bluez-users@lists.sourceforge.net 
  Sent: Friday, April 28, 2006 10:36 PM
  Subject: Re: [Bluez-users] Rfcomm Problems


    I need that cat /dev/rfcomm0 is kept open. 

  To my knowledge, this is not currently possible.  Anyone?

  -albert

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[Bluez-users] rfcomm problems

[Gene Imes]

I have a D-Link dbt-120 dongle. This has been working fine with a
bluetooth GPS. However today I tried to use it and I could not connect
to the GPS.

When I plug the dbt-120 in the /dev/rfcomm0-255 are created. If I try a
'cat /dev/rfcomm0' I get cat: rfcomm0 No such device. Previously a 'cat
/dev/rfcomm0' would return everything the GPS was sending.

Anyone know what is going on here?

Thanks,

Gene 


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Re: [Bluez-users] rfcomm problems

[Marcel Holtmann]

Hi Gene,

> I have a D-Link dbt-120 dongle. This has been working fine with a
> bluetooth GPS. However today I tried to use it and I could not connect
> to the GPS.
> 
> When I plug the dbt-120 in the /dev/rfcomm0-255 are created. If I try a
> 'cat /dev/rfcomm0' I get cat: rfcomm0 No such device. Previously a 'cat
> /dev/rfcomm0' would return everything the GPS was sending.
> 
> Anyone know what is going on here?

you should check that "rfcomm -a" reports your bindung with the GPS
device. Check if hcid is runninng and run "hcidump -x" to see what is
going on. And of course find out what you have changed.

Regards

Marcel




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[Bluez-users] rfcomm problems

[zubiwat]

Hi.

I have problems with rfcomm, because when i connect two pc's I don't know how to make them to transfer files or text between tty's. One komputer uses bluez and the other one USB dongle with WinXP.

Please help because the two compueters are paired and connected using rfcomm and Serial Port. But when I try to type sth on tty nothing happens.

I would be greatfull for howto or step-by-step text.

Regards

Maciej Zubilewicz


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Re: [Bluez-users] rfcomm problems

[Marcel Holtmann]

Hi Maciej,

> I have problems with rfcomm, because when i connect two pc's I don't know how to make them to transfer files or text between tty's. One komputer uses bluez and the other one USB dongle with WinXP.
> 
> Please help because the two compueters are paired and connected using rfcomm and Serial Port. But when I try to type sth on tty nothing happens.

for file transfer you must put another protocol on top of RFCOMM. For
example Obex, Kermit etc. or you can use PAN and get a TCP/IP connection
between your machines.

Regards

Marcel




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