[Bluez-users] problems with bytestream

[Bluez-users] problems with bytestream

[Paolino paperino]

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Hi, i'm writing a library to get a L2CAP stream in
Java, this library is Java Native Library that uses
L2CAP sockets of Bluez.
I've the following problem: when i send 4 bytes over
the socket, on the other side of the connection i get
5 valid read operation. Well at this point i started
to investigate and i founded very usefull the l2test
program tool. On one machine i've lauched l2test with
l2test -d -b 1 (for packets of 1 byte) and on the
client side l2test -s -b 1 -N 10 <my_srv_addr>....the
client seems to work correctly, but the server doesn't
receive any data.

[client screen dump]
[zande@ZANDEGIA andrea]$ ./l2test -s  -b 1 -N 10
00:0B:0D:40:64:D5
l2test[8186]: Connected [imtu 672, omtu 672, flush_to
65535]
l2test[8186]: Sending ...
l2test[8186]: Closing channel ...
l2test[8186]: Done
l2test[8186]: Exit

[server screen dump]
[andrea@tsunami tests]$ ./l2test -d
l2test[4907]: Waiting for connection on psm 10 ...
l2test[4908]: Connect from 00:10:C6:4D:38:AC [imtu
672, omtu 672, flush_to 65535]
l2test[4908]: Receiving ...
l2test[4908]: Disconnect. Success

No data are received by the server, nothig is printed
on the screen.

Somebody have an explanation for this things or
somebody could test my 2 commands lines on other
machine to test the behaviour.

Thanks to anybody could help me!!!
Best regards 
Andrew







		
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From: Paolino paperino <vonzoltan@yahoo.it>
To: bluez-devel@lists.sourceforge.net
Subject: [Bluez-devel] problems with bytestream
Date: Mon, 11 Oct 2004 12:56:26 +0200 (CEST)

Hi, i'm writing a library to get a L2CAP stream in
Java, this library is Java Native Library that uses
L2CAP sockets of Bluez.
I've the following problem: when i send 4 bytes over
the socket, on the other side of the connection i get
5 valid read operation. Well at this point i started
to investigate and i founded very usefull the l2test
program tool. On one machine i've lauched l2test with
l2test -d -b 1 (for packets of 1 byte) and on the
client side l2test -s -b 1 -N 10 <my_srv_addr>....the
client seems to work correctly, but the server doesn't
receive any data.

[client screen dump]
[zande@ZANDEGIA andrea]$ ./l2test -s  -b 1 -N 10
00:0B:0D:40:64:D5
l2test[8186]: Connected [imtu 672, omtu 672, flush_to
65535]
l2test[8186]: Sending ...
l2test[8186]: Closing channel ...
l2test[8186]: Done
l2test[8186]: Exit

[server screen dump]
[andrea@tsunami tests]$ ./l2test -d
l2test[4907]: Waiting for connection on psm 10 ...
l2test[4908]: Connect from 00:10:C6:4D:38:AC [imtu
672, omtu 672, flush_to 65535]
l2test[4908]: Receiving ...
l2test[4908]: Disconnect. Success

No data are received by the server, nothig is printed
on the screen.

Somebody have an explanation for this things or
somebody could test my 2 commands lines on other
machine to test the behaviour.

Thanks to anybody could help me!!!
Best regards 
Andrew




		
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[Bluez-devel] Re: [Bluez-users] problems with bytestream

[Diego Liziero]

Hi Andrea,
I took a look at l2test.c and I saw that
at the beginning of each packet sent
there is a small header.

The first 32 bits are used for the sequence number
and the following 16 for the packet size.

l2test[3491]: Recevied 18 bytes
00000000: 01 00 00 00 12 00 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f
.........|seq-number | len | payload
.........| (little endian) |

However I tested it with smaller packet sizes and it seems
to work here flawlessly.

l2test -s -b 1 -N 1 XX:XX:XX:XX:XX:XX

l2test -d
l2test[3488]: Connect from XX:XX:XX:XX:XX:XX [imtu 672, omtu 672,
flush_to 65535]
l2test[3488]: Receiving ...
l2test[3488]: Recevied 1 bytes
00000000: 00                                               .
l2test[3488]: Disconnect. Success

I used csr based USB dongles with latest bluez libs & utils.

Ciao,
Diego Liziero.



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[Bluez-devel] Re: [Bluez-users] problems with bytestream + rfcomm socket problems

[Paolino paperino]

Thanks Diego,
Now i've tested the rctest (without the usleep that
i've inserted) on a machine with kernel 2.4.18 and
bluez libs/utils 2.2(USB dongle digicom), and the
receive function doesn't give any prblems, work well,
doesn't loose any byte...is this a bug in the kernel i
use?!

PS The USB dongle i use with the kernel 2.6 is a Trust
BT180

Thanks 
Andrea S.



		
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Re: [Bluez-users] problems with bytestream + rfcomm socket problems

[Diego Liziero]

Hello Andrea,

On Wed, 2004-10-13 at 16:38, Paolino paperino wrote:
> Thanks Diego,
> Now i've tested the rctest (without the usleep that
> i've inserted) on a machine with kernel 2.4.18 and
> bluez libs/utils 2.2(USB dongle digicom), and the
> receive function doesn't give any prblems, work well,
> doesn't loose any byte...is this a bug in the kernel i
> use?!

Here it works with kernels 2.6.7-2.tmb.6mdk (mandrake)
and 2.6.9-rc3-mm3-ecn-retry (debian).
Sorry, I don't have a RedHat.

> PS The USB dongle i use with the kernel 2.6 is a Trust
> BT180

Try to switch the Bluetooth dongle and see if it is
it's fault.

> Thanks 
> Andrea S.

Diego.



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Re: [Bluez-users] problems with bytestream + rfcomm socket problems

[Paolino paperino]

Thank's Diego
it wasn't a prblem of dongle or bluez, because i've
tested all the USB dongles with two kernel 2.6.8  of
Fedora's, and all works fine, i'will try to test with
the latest 2.4.27 series, i think the prblem was in
the ker 2.4.18 i used.

> Try to switch the Bluetooth dongle and see if it is
> it's fault.
> 
> > Thanks 
> > Andrea S.
> 
> Diego.



		
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Re: [Bluez-users] problems with bytestream + rfcomm socket problems

[Paolino paperino]

 --- Diego Liziero <liziero.diego@unimore.it> ha
scritto: 
> Hello Andrea,
> 
> On Wed, 2004-10-13 at 16:38, Paolino paperino wrote:
> > Thanks Diego,
> > Now i've tested the rctest (without the usleep
> that
> > i've inserted) on a machine with kernel 2.4.18 and
> > bluez libs/utils 2.2(USB dongle digicom), and the
> > receive function doesn't give any prblems, work
> well,
> > doesn't loose any byte...is this a bug in the
> kernel i
> > use?!
> 
> Here it works with kernels 2.6.7-2.tmb.6mdk
> (mandrake)
> and 2.6.9-rc3-mm3-ecn-retry (debian).
> Sorry, I don't have a RedHat.
> 
> > PS The USB dongle i use with the kernel 2.6 is a
> Trust
> > BT180
> 
> Try to switch the Bluetooth dongle and see if it is
> it's fault.
> 
> > Thanks 
> > Andrea S.
> 
> Diego.
> 
> 
> 
>
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