[Bluez-users] Connection dropped or cannot connect

[Bluez-users] Connection dropped or cannot connect

[Jean-Pierre Lord]

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My Linux box has a Anycom usb-220 bluetooth adapter connected to it which is used to serve my iPAQ1940.  Works "superbly great" except those times it won't work at all ;-).  Either a long connection (like a download) will be cut or i will not be able to open a new connection.  When it happens, i have 2 choices: unplung the bluetooth adapter for a few seconds (which requires no other intervention on the software side) and replug it or reset the device using hciconfig.  Except that doing this reset will sometimes crash the hole Linux box.  I then get a stack dump and once i got a message that looked like this: "...killing interrupt handler...".  Sorry i wasn't fast enough to write down the message.

I'm running "Kernel 2.4.24-mh2 on an i586" with bluez-libs-2.5, bluez-sdp-1.5, bluez-utils-2.5.  I normally run hcid, sdpd, "dund --listen --msdun call dun".  It seems to me that enabling authentification and encryption has made the whole thing less reliable.

What can i do to improve reliability?

Thank you

An lsmod shows the following:
Module                  Size  Used by
bnep                    8912   0  (autoclean)
ppdev                   6960   0  (autoclean)
ppp_deflate             3120   0  (autoclean)
zlib_inflate           19648   0  (autoclean) [ppp_deflate]
zlib_deflate           18688   0  (autoclean) [ppp_deflate]
bsd_comp                4416   0  (autoclean)
ppp_async               6544   0  (autoclean)
ppp_generic            16960   0  (autoclean) [ppp_deflate bsd_comp ppp_async]
slhc                    4736   0  (autoclean) [ppp_generic]
crc32                   2848   0  [bnep]
sco                     7936   0  (unused)
hci_usb                 6336   1
usb-ohci               16816   0  (unused)
rfcomm                 29040   1  (autoclean)
l2cap                  15632   2  (autoclean) [bnep rfcomm]
bluez                  28224   3  (autoclean) [bnep sco hci_usb rfcomm l2cap]
ipt_MASQUERADE          1344   1  (autoclean)
ipt_state                576   2  (autoclean)
ip_nat_ftp              2912   0  (unused)
iptable_nat            16592   2  [ipt_MASQUERADE ip_nat_ftp]
ip_conntrack_ftp        3760   1
ip_conntrack           18752   3  [ipt_MASQUERADE ipt_state ip_nat_ftp iptable_nat ip_conntrack_ftp]
iptable_filter          1680   1
ip_tables              12000   6  [ipt_MASQUERADE ipt_state iptable_nat iptable_filter]
3c509                   8304   2
rtc                     6112   0  (autoclean)

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Re: [Bluez-users] Connection dropped or cannot connect

[Marcel Holtmann]

Hi Jean-Pierre,

> My Linux box has a Anycom usb-220 bluetooth adapter connected to it
> which is used to serve my iPAQ1940.  Works "superbly great" except
> those times it won't work at all ;-).  Either a long connection (like
> a download) will be cut or i will not be able to open a new
> connection.  When it happens, i have 2 choices: unplung the bluetooth
> adapter for a few seconds (which requires no other intervention on the
> software side) and replug it or reset the device using hciconfig. 
> Except that doing this reset will sometimes crash the hole Linux box. 
> I then get a stack dump and once i got a message that looked like
> this: "...killing interrupt handler...".  Sorry i wasn't fast enough
> to write down the message.

this message is important and you should try to get it over a serial
console. Please try a 2.4.25-mh3 or a 2.4.26-rc2. Maybe there is already
a fix for it.
 
> I'm running "Kernel 2.4.24-mh2 on an i586" with bluez-libs-2.5,
> bluez-sdp-1.5, bluez-utils-2.5.  I normally run hcid, sdpd, "dund
> --listen --msdun call dun".  It seems to me that enabling
> authentification and encryption has made the whole thing less
> reliable.

Setting auth and encrypt switches to security mode 3 which is not what
your really want.

Regards

Marcel




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Re: [Bluez-users] Connection dropped or cannot connect

[Richard Cox]

On Friday 09 April 2004 09:10 pm, Jean-Pierre Lord wrote:
> My Linux box has a Anycom usb-220 bluetooth adapter connected to it which
> is used to serve my iPAQ1940.  Works "superbly great" except those times it
> won't work at all ;-).  Either a long connection (like a download) will be
> cut or i will not be able to open a new connection.  When it happens, i
> have 2 choices: unplung the bluetooth adapter for a few seconds (which
> requires no other intervention on the software side) and replug it or reset
> the device using hciconfig.  Except that doing this reset will sometimes
> crash the hole Linux box.  I then get a stack dump and once i got a message
> that looked like this: "...killing interrupt handler...".  Sorry i wasn't
> fast enough to write down the message.
>
> I'm running "Kernel 2.4.24-mh2 on an i586" with bluez-libs-2.5,
> bluez-sdp-1.5, bluez-utils-2.5.  I normally run hcid, sdpd, "dund --listen
> --msdun call dun".  It seems to me that enabling authentification and
> encryption has made the whole thing less reliable.
>
> What can i do to improve reliability?
>
> Thank you
>
> An lsmod shows the following:
> Module                  Size  Used by
> bnep                    8912   0  (autoclean)
> ppdev                   6960   0  (autoclean)
> ppp_deflate             3120   0  (autoclean)
> zlib_inflate           19648   0  (autoclean) [ppp_deflate]
> zlib_deflate           18688   0  (autoclean) [ppp_deflate]
> bsd_comp                4416   0  (autoclean)
> ppp_async               6544   0  (autoclean)
> ppp_generic            16960   0  (autoclean) [ppp_deflate bsd_comp
> ppp_async] slhc                    4736   0  (autoclean) [ppp_generic]
> crc32                   2848   0  [bnep]
> sco                     7936   0  (unused)
> hci_usb                 6336   1
> usb-ohci               16816   0  (unused)
> rfcomm                 29040   1  (autoclean)
> l2cap                  15632   2  (autoclean) [bnep rfcomm]
> bluez                  28224   3  (autoclean) [bnep sco hci_usb rfcomm
> l2cap] ipt_MASQUERADE          1344   1  (autoclean)
> ipt_state                576   2  (autoclean)
> ip_nat_ftp              2912   0  (unused)
> iptable_nat            16592   2  [ipt_MASQUERADE ip_nat_ftp]
> ip_conntrack_ftp        3760   1
> ip_conntrack           18752   3  [ipt_MASQUERADE ipt_state ip_nat_ftp
> iptable_nat ip_conntrack_ftp] iptable_filter          1680   1
> ip_tables              12000   6  [ipt_MASQUERADE ipt_state iptable_nat
> iptable_filter] 3c509                   8304   2
> rtc                     6112   0  (autoclean)

Good news and bad news,
	Good news is that i've got my iPAQ pan connection working very well, but am 
having a very similar problem to the once described here.  Here's what 
happens in the log:

Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 ACL tx timeout
Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 killing stalled ACL 
connection B6:CB:5A:16:05:00
Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering disabled state
Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering disabled state
Apr 10 16:31:45 furrball kernel: device bnep0 left promiscuous mode

After that happens, the only thing that will fix it is to unplug and re-insert 
the USB dongle.  hciconfig just returns this when I try a reset:

[furrball:~]# hciconfig hci0 reset
Can't init device hci0. Connection timed out(110)

I read this response and turned off encrypt and authentication in hci.conf, 
but it has made no noticable difference.  This always happens after a little 
over 1 or 2 Mb of data xfer.

Any ideas on what we might try next.  If you need any more info, I'll be happy 
to provide it.

PS:  I'm using the latest bluez download from the download section, i'm 
running a vanilla 2.4.25 kernel on gentoo linux.  I've got a Belkin F8T003 
USB adapter too.

Regards,

Richard


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Re: [Bluez-users] Connection dropped or cannot connect

[Marcel Holtmann]

Hi Richard,

> Good news and bad news,
> 	Good news is that i've got my iPAQ pan connection working very well, but am 
> having a very similar problem to the once described here.  Here's what 
> happens in the log:
> 
> Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 ACL tx timeout
> Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 killing stalled ACL 
> connection B6:CB:5A:16:05:00
> Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering disabled state
> Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering disabled state
> Apr 10 16:31:45 furrball kernel: device bnep0 left promiscuous mode
> 
> After that happens, the only thing that will fix it is to unplug and re-insert 
> the USB dongle.  hciconfig just returns this when I try a reset:
> 
> [furrball:~]# hciconfig hci0 reset
> Can't init device hci0. Connection timed out(110)
> 
> I read this response and turned off encrypt and authentication in hci.conf, 
> but it has made no noticable difference.  This always happens after a little 
> over 1 or 2 Mb of data xfer.

this sound to me like the Transilica chip in the USB-220 is buggy and
that it has a problem when sending frames with multiple size of bulk max
packet. You can try to add "#define CONFIG_BT_HCIUSB_ZERO_PACKET" at the
top of hci_usb.c and try again.

> PS:  I'm using the latest bluez download from the download section, i'm 
> running a vanilla 2.4.25 kernel on gentoo linux.  I've got a Belkin F8T003 
> USB adapter too.

Do this adapter have the same problem? Is it CSR based?

Regards

Marcel




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Re: [Bluez-users] Connection dropped or cannot connect

[Richard Cox]

On Saturday 10 April 2004 05:09 pm, Marcel Holtmann wrote:
> Hi Richard,
>
> > Good news and bad news,
> > 	Good news is that i've got my iPAQ pan connection working very well, but
> > am having a very similar problem to the once described here.  Here's what
> > happens in the log:
> >
> > Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 ACL tx timeout
> > Apr 10 16:31:45 furrball kernel: hci_acl_tx_to: hci0 killing stalled ACL
> > connection B6:CB:5A:16:05:00
> > Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering disabled
> > state Apr 10 16:31:45 furrball kernel: pan0: port 1(bnep0) entering
> > disabled state Apr 10 16:31:45 furrball kernel: device bnep0 left
> > promiscuous mode
> >
> > After that happens, the only thing that will fix it is to unplug and
> > re-insert the USB dongle.  hciconfig just returns this when I try a
> > reset:
> >
> > [furrball:~]# hciconfig hci0 reset
> > Can't init device hci0. Connection timed out(110)
> >
> > I read this response and turned off encrypt and authentication in
> > hci.conf, but it has made no noticable difference.  This always happens
> > after a little over 1 or 2 Mb of data xfer.
>
> this sound to me like the Transilica chip in the USB-220 is buggy and
> that it has a problem when sending frames with multiple size of bulk max
> packet. You can try to add "#define CONFIG_BT_HCIUSB_ZERO_PACKET" at the
> top of hci_usb.c and try again.
>
> > PS:  I'm using the latest bluez download from the download section, i'm
> > running a vanilla 2.4.25 kernel on gentoo linux.  I've got a Belkin
> > F8T003 USB adapter too.
>
> Do this adapter have the same problem? Is it CSR based?
>
> Regards
>
> Marcel

" Do this adapter have the same problem? Is it CSR based?"

Yes, according to the bluez hardware compatibilty list 
(http://www.holtmann.org/linux/bluetooth/devices.html) it says:
 
Belkin F8T003 USB Adapter  	CSR  	1.1  	hci_usb  	working  	Nayib Kiuhan

I'll certainly try defining that macro you listed above and see what happens.

Thanks Marcel.

Regards,

Richard

Re: [Bluez-users] Connection dropped or cannot connect

[Marcel Holtmann]

Hi Richard,

> " Do this adapter have the same problem? Is it CSR based?"
> 
> Yes, according to the bluez hardware compatibilty list 
> (http://www.holtmann.org/linux/bluetooth/devices.html) it says:
>  
> Belkin F8T003 USB Adapter  	CSR  	1.1  	hci_usb  	working  	Nayib Kiuhan

you are kidding ;) I actually know what's in my own list, but I wanna be
sure that the entry is correct. So check with "hciconfig -a".

And "yes" means that the adapter is CSR based or that it have the same
problem.

> I'll certainly try defining that macro you listed above and see what happens.

Or you can remove these four lines:

	#ifndef CONFIG_BT_HCIUSB_ZERO_PACKET
	#undef  URB_ZERO_PACKET
	#define URB_ZERO_PACKET 0
	#endif

Regards

Marcel




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Re: [Bluez-users] Connection dropped or cannot connect

[Richard Cox]

On Saturday 10 April 2004 05:25 pm, Marcel Holtmann wrote:
> Hi Richard,
>
> > " Do this adapter have the same problem? Is it CSR based?"
> >
> > Yes, according to the bluez hardware compatibilty list
> > (http://www.holtmann.org/linux/bluetooth/devices.html) it says:
> >
> > Belkin F8T003 USB Adapter  	CSR  	1.1  	hci_usb  	working  	Nayib Kiuhan
>
> you are kidding ;) I actually know what's in my own list, but I wanna be
> sure that the entry is correct. So check with "hciconfig -a".
>
> And "yes" means that the adapter is CSR based or that it have the same
> problem.
>
> > I'll certainly try defining that macro you listed above and see what
> > happens.
>
> Or you can remove these four lines:
>
> 	#ifndef CONFIG_BT_HCIUSB_ZERO_PACKET
> 	#undef  URB_ZERO_PACKET
> 	#define URB_ZERO_PACKET 0
> 	#endif
>
> Regards
>
> Marcel

Heh heh 8^)  Sorry, I'm new to the list and I didn't realize Marcel Holtmann 
== holtmann.org.  Tried that macro, and no luck.  BTW, hciconfig -a returns 
this:

hci0:   Type: USB
        BD Address: 00:0A:3A:51:61:E8 ACL MTU: 192:8  SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:32752 acl:250 sco:0 events:339 errors:0
        TX bytes:79048 acl:472 sco:0 commands:16 errors:0
        Features: 0xff 0xff 0x0b 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: HOLD SNIFF PARK
        Link mode: ACCEPT MASTER
        Name: 'BlueZ (0)'
        Class: 0x000100
        Service Classes: Unspecified
        Device Class: Computer, Uncategorized
        HCI Ver: 1.1 (0x1) HCI Rev: 0x20d LMP Ver: 1.1 (0x1) LMP Subver: 0x20d
        Manufacturer: Cambridge Silicon Radio (10)

So it does look like a CSR adapter.

Thanks again 

Regards,

Richard

Re: [Bluez-users] Connection dropped or cannot connect (Solved!!!!!!)

[Richard Cox]

On Saturday 10 April 2004 05:25 pm, Marcel Holtmann wrote:
> Hi Richard,
>
> > " Do this adapter have the same problem? Is it CSR based?"
> >
> > Yes, according to the bluez hardware compatibilty list
> > (http://www.holtmann.org/linux/bluetooth/devices.html) it says:
> >
> > Belkin F8T003 USB Adapter  	CSR  	1.1  	hci_usb  	working  	Nayib Kiuhan
>
> you are kidding ;) I actually know what's in my own list, but I wanna be
> sure that the entry is correct. So check with "hciconfig -a".
>
> And "yes" means that the adapter is CSR based or that it have the same
> problem.
>
> > I'll certainly try defining that macro you listed above and see what
> > happens.
>
> Or you can remove these four lines:
>
> 	#ifndef CONFIG_BT_HCIUSB_ZERO_PACKET
> 	#undef  URB_ZERO_PACKET
> 	#define URB_ZERO_PACKET 0
> 	#endif
>
> Regards
>
> Marcel
>
>
>
>
> -------------------------------------------------------
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> _______________________________________________
> Bluez-users mailing list
> Bluez-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-users

Marcel,

	First, let me thank you for your patience with my questions!  Now, for the 
readers of this list, I'll let you know the secret to fixing this problem, at 
least for my setup:

	I downloaded the kernel patch from your website (patch-2.4.25-mh3.gz), saved 
by .config, did a 'make mrproper', restored the .config, rebuilt the kernel, 
rebooted and... and that fixed my problems.  I run a Gentoo system with a 
'vanilla' 2.4.25 kernel, so the patch for the toplevel Makefile failed, but 
that didn't matter since it only affected the 'EXTRAVERSION' macro, which the 
vanilla kernel does not set.  

	Since I applied that patch and rebuilt the kernel, I've been surfing the web, 
listening to streaming media on my iPaq, etc for the past hour without a 
single disconnect!  Outstanding!  Before I patched, I couldn't do anything 
like this for more than 5 minutes before I would get the error that required 
removal of the usb dongle.  Anyone experiencing this particular problem 
should try that patch out before giving up.  

Best Wishes

Richard


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Re: [Bluez-users] Connection dropped or cannot connect (Solved!!!!!!)

[Richard Cox]

On Sunday 11 April 2004 11:38 am, Richard Cox wrote:
> On Saturday 10 April 2004 05:25 pm, Marcel Holtmann wrote:
> > Hi Richard,
> >
> > > " Do this adapter have the same problem? Is it CSR based?"
> > >
> > > Yes, according to the bluez hardware compatibilty list
> > > (http://www.holtmann.org/linux/bluetooth/devices.html) it says:
> > >
> > > Belkin F8T003 USB Adapter  	CSR  	1.1  	hci_usb  	working  	Nayib
> > > Kiuhan
> >
> > you are kidding ;) I actually know what's in my own list, but I wanna be
> > sure that the entry is correct. So check with "hciconfig -a".
> >
> > And "yes" means that the adapter is CSR based or that it have the same
> > problem.
> >
> > > I'll certainly try defining that macro you listed above and see what
> > > happens.
> >
> > Or you can remove these four lines:
> >
> > 	#ifndef CONFIG_BT_HCIUSB_ZERO_PACKET
> > 	#undef  URB_ZERO_PACKET
> > 	#define URB_ZERO_PACKET 0
> > 	#endif
> >
> > Regards
> >
> > Marcel
> >
> >
> >
> >
> > -------------------------------------------------------
> > This SF.Net email is sponsored by: IBM Linux Tutorials
> > Free Linux tutorial presented by Daniel Robbins, President and CEO of
> > GenToo technologies. Learn everything from fundamentals to system
> > administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click
> > _______________________________________________
> > Bluez-users mailing list
> > Bluez-users@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/bluez-users
>
> Marcel,
>
> 	First, let me thank you for your patience with my questions!  Now, for the
> readers of this list, I'll let you know the secret to fixing this problem,
> at least for my setup:
>
> 	I downloaded the kernel patch from your website (patch-2.4.25-mh3.gz),
> saved by .config, did a 'make mrproper', restored the .config, rebuilt the
> kernel, rebooted and... and that fixed my problems.  I run a Gentoo system
> with a 'vanilla' 2.4.25 kernel, so the patch for the toplevel Makefile
> failed, but that didn't matter since it only affected the 'EXTRAVERSION'
> macro, which the vanilla kernel does not set.
>
> 	Since I applied that patch and rebuilt the kernel, I've been surfing the
> web, listening to streaming media on my iPaq, etc for the past hour without
> a single disconnect!  Outstanding!  Before I patched, I couldn't do
> anything like this for more than 5 minutes before I would get the error
> that required removal of the usb dongle.  Anyone experiencing this
> particular problem should try that patch out before giving up.
>
> Best Wishes
>
> Richard
>
*Sigh*

Seems I spoke too soon 8^(  As soon as I sent this, it disconnected again.  I 
should have waited a bit longer to post I suppose.  Nevertheless, for some 
reason, it went much longer without this error this time....I'll keep trying.

Richard


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Re: [Bluez-users] Connection dropped or cannot connect (Solved!!!!!!)

[Marcel Holtmann]

Hi Richard,

> Seems I spoke too soon 8^(  As soon as I sent this, it disconnected again.  I 
> should have waited a bit longer to post I suppose.  Nevertheless, for some 
> reason, it went much longer without this error this time....I'll keep trying.

I really think that this an USB problem. You should test the 2.4.26-rc2
or switch to the latest 2.6.

Regards

Marcel




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Re: [Bluez-users] Connection dropped or cannot connect (Solved!!!!!!)

[Richard Cox]

On Sunday 11 April 2004 12:37 pm, Marcel Holtmann wrote:
> Hi Richard,
>
> > Seems I spoke too soon 8^(  As soon as I sent this, it disconnected
> > again.  I should have waited a bit longer to post I suppose. 
> > Nevertheless, for some reason, it went much longer without this error
> > this time....I'll keep trying.
>
> I really think that this an USB problem. You should test the 2.4.26-rc2
> or switch to the latest 2.6.
>
> Regards
>
> Marcel
>
Ok, I've gotten up the nerve to give 2.6.5 a shot!  I've been wanting to try 
that kernel out anyway, so this is as good a reason as any 8^)  I'll let you 
guys know what happens...Wish me good luck!

Regards,

Richard


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Re: [Bluez-users] Connection dropped or cannot connect

[Jean-Pierre Lord]

Thank you for your quick reply, Marcel...and sorry for being so slow to
answer.

----- Original Message ----- 
From: "Marcel Holtmann" <marcel@holtmann.org>
To: "Jean-Pierre Lord" <jeanplord@videotron.ca>
Cc: "BlueZ Mailing List" <bluez-users@lists.sourceforge.net>
Sent: Saturday, April 10, 2004 6:28 AM
Subject: Re: [Bluez-users] Connection dropped or cannot connect


> Hi Jean-Pierre,
>
> > My Linux box has a Anycom usb-220 bluetooth adapter connected to it
> > which is used to serve my iPAQ1940.  Works "superbly great" except
> > those times it won't work at all ;-).  Either a long connection (like
> > a download) will be cut or i will not be able to open a new
> > connection.  When it happens, i have 2 choices: unplung the bluetooth
> > adapter for a few seconds (which requires no other intervention on the
> > software side) and replug it or reset the device using hciconfig.
> > Except that doing this reset will sometimes crash the hole Linux box.
> > I then get a stack dump and once i got a message that looked like
> > this: "...killing interrupt handler...".  Sorry i wasn't fast enough
> > to write down the message.
>
> this message is important and you should try to get it over a serial
> console. Please try a 2.4.25-mh3 or a 2.4.26-rc2. Maybe there is already
> a fix for it.
>
You're right, you need the message and i was able to get one.  I had 2 other
crashes, this time only by insisting to connect.  By insisting i mean
turning on the bluetooth on the iPaq and try to connect, turn it off, retry
and so on a few times.

Here are the dump details:

Unable to handle kernel paging request at virtual address 413e3344
Oops: 0000
CPU: 0
EIP: 0010:[<c485920e>] not tainted
EFlags: 00010086

eax: c1747180 ebx: c1747140 ecx: 01747180 edx: 01747180
esi: 413e333c edi: c2dca000 ebp: c1745000 esp: c02a9f10
ds: 0018 es:0018 ss: 0018

Process swapper (pid: 0, stackpage = c02a9000)

stack: c1838f20 c1747180 c1747200 0 0 c2dcac08 00084000 00000282 1 0
c011973b 1 c1745000 c4851000 1 4 c485a38a c1745000 0 c1db1a80 04000001 f
c02a9fb0 c01081fa

call trace: [<c011973b>] [<c485a38a>] [<c01081fa>] [<c010837d>] [<c0105250>]
[<c010a788>] [<c0105250>] [<c0105274>] [<c01052e2>] [>c0105000>]

Code 83 7e 08 01 74 06 f6 47 18 04 74 3c 8b 03 c1 e8 1c 83 f8 0d

<0> Kernel panic: Aiee killing interrupt handler!
Interrupt handler - not syncing

That's it!
I will move to 2.4.26rc2 (or better).  I will also install the patches you
may have for this kernel (i haven't check yet).

> > I'm running "Kernel 2.4.24-mh2 on an i586" with bluez-libs-2.5,
> > bluez-sdp-1.5, bluez-utils-2.5.  I normally run hcid, sdpd, "dund
> > --listen --msdun call dun".  It seems to me that enabling
> > authentification and encryption has made the whole thing less
> > reliable.
>
> Setting auth and encrypt switches to security mode 3 which is not what
> your really want.
>
May be.  What i want is making sure no uninvited party connects to my Linux
server.  I also feel at ease knowing the communications are not easy to
sniff.  But may be i am a bit to paranoid.  Especially considering that
Bluetooth is definitly not popular here in Montreal.

I will chech for another way to put a minimum of protection.

Merci!

> Regards
>
> Marcel
>
>