[Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Michael Schmidt]

Hi folks,

I'm experiencing the following behavior with BlueZ and L2CAP:

After establishing an L2CAP connection between two nodes, only the 
master of this connection is still able to:

- perform periodic device inquiries (i.e. search other devices
   in 'Periodic_Inquiry_Mode')	
- perform inquiry scans (i.e. be visible for other searching devices)

However, I would like to be able to do this as slave as well (at least, 
to perform inquiry scans as slave).

Now I'm wondering whether:

- this is a restriction of BlueZ		or
- this is a restriction of my BT chipsets	or
- this is a restriction of Bluetooth		or
- I'm doing (configuring) something wrong...

My environment:

SuSE Linux 9.0: kernel 2.4.21, bluez-libs 2.4, bluez-utils-2.3

I have tested and verified this behavior with the BrainBoxes BL-500 and
BL-554 adapters.
I'd be very grateful if someone of you could shed some light on this topic.


Thanks in advance,

Michael

-- 
===========================================
Michael Schmidt
-------------------------------------------
Institute for Data Communications Systems
University of Siegen, Germany
-------------------------------------------
http:   www.nue.et-inf.uni-siegen.de
===========================================



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Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Collin R. Mulliner]

Hi Michael,

I have an application which connects 2 or mode nodes via rfcomm and all
nodes still do inquirys all the time. Since rfcomm is build on top of
l2cap your stuff should work. Maybe you like to verify it by looking at
my code - http://www.mulliner.org/bluetooth/btchat/

> I'm experiencing the following behavior with BlueZ and L2CAP:
> 
> After establishing an L2CAP connection between two nodes, only the 
> master of this connection is still able to:
> 
> - perform periodic device inquiries (i.e. search other devices
>    in 'Periodic_Inquiry_Mode')	
> - perform inquiry scans (i.e. be visible for other searching devices)
> 
> However, I would like to be able to do this as slave as well (at
> least, to perform inquiry scans as slave).
> 
> Now I'm wondering whether:
> 
> - this is a restriction of BlueZ		or
> - this is a restriction of my BT chipsets	or
> - this is a restriction of Bluetooth		or
> - I'm doing (configuring) something wrong...


-- 
Collin R. Mulliner <collin@betaversion.net>
BETAVERSiON Systems [www.betaversion.net]
info/pgp: finger collin@betaversion.net
God is real, unless declared integer.


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Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Marcel Holtmann]

Hi Michael,

> I'm experiencing the following behavior with BlueZ and L2CAP:
> 
> After establishing an L2CAP connection between two nodes, only the 
> master of this connection is still able to:
> 
> - perform periodic device inquiries (i.e. search other devices
>    in 'Periodic_Inquiry_Mode')	
> - perform inquiry scans (i.e. be visible for other searching devices)
> 
> However, I would like to be able to do this as slave as well (at least, 
> to perform inquiry scans as slave).
> 
> Now I'm wondering whether:
> 
> - this is a restriction of BlueZ		or
> - this is a restriction of my BT chipsets	or
> - this is a restriction of Bluetooth		or
> - I'm doing (configuring) something wrong...
> 
> My environment:
> 
> SuSE Linux 9.0: kernel 2.4.21, bluez-libs 2.4, bluez-utils-2.3
> 
> I have tested and verified this behavior with the BrainBoxes BL-500 and
> BL-554 adapters.
> I'd be very grateful if someone of you could shed some light on this topic.

this sounds like a chip limitation. What does "hciconfig -a" say?

Regards

Marcel




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Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Michael Schmidt]

Hi Marcel,


Marcel Holtmann schrieb:
> Hi Michael,
> 
> 
>>I'm experiencing the following behavior with BlueZ and L2CAP:
>>
>>After establishing an L2CAP connection between two nodes, only the 
>>master of this connection is still able to:
>>
>>- perform periodic device inquiries (i.e. search other devices
>>   in 'Periodic_Inquiry_Mode')	
>>- perform inquiry scans (i.e. be visible for other searching devices)
>>
>>However, I would like to be able to do this as slave as well (at least, 
>>to perform inquiry scans as slave).
>>
>>Now I'm wondering whether:
>>
>>- this is a restriction of BlueZ		or
>>- this is a restriction of my BT chipsets	or
>>- this is a restriction of Bluetooth		or
>>- I'm doing (configuring) something wrong...
>>
>>My environment:
>>
>>SuSE Linux 9.0: kernel 2.4.21, bluez-libs 2.4, bluez-utils-2.3
>>
>>I have tested and verified this behavior with the BrainBoxes BL-500 and
>>BL-554 adapters.
>>I'd be very grateful if someone of you could shed some light on this topic.
> 
> 
> this sounds like a chip limitation. What does "hciconfig -a" say?

Here goes:

BL-554:

hci0:	Type: USB
	BD Address: 02:00:F4:18:51:74 ACL MTU: 192:8  SCO MTU: 64:8
	UP RUNNING PSCAN ISCAN
	RX bytes:1787 acl:1 sco:0 events:92 errors:0
	TX bytes:543 acl:1 sco:0 commands:44 errors:0
	Features: 0xff 0xff 0x0f 0x00
	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
	Link policy: RSWITCH HOLD SNIFF PARK
	Link mode: SLAVE ACCEPT
	Name: 'BlueZ (0)'
	Class: 0x000100
	Service Classes: Unspecified
	Device Class: Computer, Uncategorized
	HCI Ver: 1.1 (0x1) HCI Rev: 0x175 LMP Ver: 1.1 (0x1)
	LMP Subver: 0x175
	Manufacturer: Cambridge Silicon Radio (10)


BL-500:

hci0:	Type: UART
	BD Address: 02:00:80:EC:7C:4A ACL MTU: 192:8  SCO MTU: 64:8
	UP RUNNING PSCAN ISCAN
	RX bytes:897 acl:0 sco:0 events:19 errors:0
	TX bytes:634 acl:0 sco:0 commands:20 errors:0
	Features: 0xff 0xff 0x0f 0x00
	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
	Link policy: RSWITCH HOLD SNIFF PARK
	Link mode: SLAVE ACCEPT
	Name: 'BlueZ (0)'
	Class: 0x000100
	Service Classes: Unspecified
	Device Class: Computer, Uncategorized
	HCI Ver: 1.1 (0x1) HCI Rev: 0x135 LMP Ver: 1.1 (0x1)
	LMP Subver: 0x135
	Manufacturer: Cambridge Silicon Radio (10)


Don't get confused by the apparently weird device addresses; this is 
part of my project.


Michael


-- 
=================================================
Michael Schmidt
-------------------------------------------------
Institute for Data Communications Systems
University of Siegen, Germany
-------------------------------------------------
http:   www.nue.et-inf.uni-siegen.de
=================================================

Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Marcel Holtmann]

Hi Michael,

> > this sounds like a chip limitation. What does "hciconfig -a" say?
> 
> Here goes:
> 
> BL-554:
> 
> hci0:	Type: USB
> 	BD Address: 02:00:F4:18:51:74 ACL MTU: 192:8  SCO MTU: 64:8
> 	UP RUNNING PSCAN ISCAN
> 	RX bytes:1787 acl:1 sco:0 events:92 errors:0
> 	TX bytes:543 acl:1 sco:0 commands:44 errors:0
> 	Features: 0xff 0xff 0x0f 0x00
> 	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
> 	Link policy: RSWITCH HOLD SNIFF PARK
> 	Link mode: SLAVE ACCEPT
> 	Name: 'BlueZ (0)'
> 	Class: 0x000100
> 	Service Classes: Unspecified
> 	Device Class: Computer, Uncategorized
> 	HCI Ver: 1.1 (0x1) HCI Rev: 0x175 LMP Ver: 1.1 (0x1)
> 	LMP Subver: 0x175
> 	Manufacturer: Cambridge Silicon Radio (10)
> 
> 
> BL-500:
> 
> hci0:	Type: UART
> 	BD Address: 02:00:80:EC:7C:4A ACL MTU: 192:8  SCO MTU: 64:8
> 	UP RUNNING PSCAN ISCAN
> 	RX bytes:897 acl:0 sco:0 events:19 errors:0
> 	TX bytes:634 acl:0 sco:0 commands:20 errors:0
> 	Features: 0xff 0xff 0x0f 0x00
> 	Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
> 	Link policy: RSWITCH HOLD SNIFF PARK
> 	Link mode: SLAVE ACCEPT
> 	Name: 'BlueZ (0)'
> 	Class: 0x000100
> 	Service Classes: Unspecified
> 	Device Class: Computer, Uncategorized
> 	HCI Ver: 1.1 (0x1) HCI Rev: 0x135 LMP Ver: 1.1 (0x1)
> 	LMP Subver: 0x135
> 	Manufacturer: Cambridge Silicon Radio (10)
> 
> 
> Don't get confused by the apparently weird device addresses; this is 
> part of my project.

you need at least a HCI 16.4 firmware to get it working. Check my pages
and the "hciconfig hci0 revision" command for more information.

Regards

Marcel




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[Bluez-users] general question on the procedure of BlueZ

[Johannes]

Hi all,

I would have a question on the general procedure, how BlueZ works.

My problem is, that the video-file, I will send from Server to mobile 
phone, is corrupt. At most, there were transmitted only 9216byte instead 
the origin 12913byte. When I let the server sleep for (e.g.)  60sec. 
after the video-file (over an OutputStream and OutputStream.close()) is 
sent  and before the connection is closed to the phone, it works. But 
this is not really a good implementation.

So, how does the BlueZ-Stack works. Does it has an puffer, smaller than 
13kbyte or how is the connecton-closing realized? Will be the connection 
closed, if such an methode will be called, no matter, whether there are 
data in the puffer?

Greets Johannes


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Re: [Bluez-users] general question on the procedure of BlueZ

[Johannes]

Hi again,

I forgot to say, that the sdp-deamon says "Segmentation fault", when I 
cancel it, to start an new version of my proxy.
Hopefully it helps.

Greets Johannes


Johannes wrote:

> Hi all,
>
> I would have a question on the general procedure, how BlueZ works.
>
> My problem is, that the video-file, I will send from Server to mobile 
> phone, is corrupt. At most, there were transmitted only 9216byte 
> instead the origin 12913byte. When I let the server sleep for (e.g.)  
> 60sec. after the video-file (over an OutputStream and 
> OutputStream.close()) is sent  and before the connection is closed to 
> the phone, it works. But this is not really a good implementation.
>
> So, how does the BlueZ-Stack works. Does it has an puffer, smaller 
> than 13kbyte or how is the connecton-closing realized? Will be the 
> connection closed, if such an methode will be called, no matter, 
> whether there are data in the puffer?
>
> Greets Johannes
>
>
> -------------------------------------------------------
> This SF.Net email is sponsored by BEA Weblogic Workshop
> FREE Java Enterprise J2EE developer tools!
> Get your free copy of BEA WebLogic Workshop 8.1 today.
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> _______________________________________________
> Bluez-users mailing list
> Bluez-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bluez-users
>
>



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Re: [Bluez-users] general question on the procedure of BlueZ

[Johannes]

Hi,

can you give me a short checklist, which modules I have to start, that 
the communication will have success? Perhaps I have forgotten something.
when I do lsmod, I see the following (relevant) entries:

l2cap                  28416  2
hci_usb                16000  2
bluetooth              52100  6 l2cap,hci_usb
ehci_hcd               32644  0
uhci_hcd               33680  0
usbcore               115040  5 hci_usb,ehci_hcd,uhci_hcd

Do I need more to use  the BT Serial Port Profile on serverside with no 
problems?

Thanks Johannes



Johannes wrote:

> Hi again,
>
> I forgot to say, that the sdp-deamon says "Segmentation fault", when I 
> cancel it, to start an new version of my proxy.
> Hopefully it helps.
>
> Greets Johannes
>
>
> Johannes wrote:
>
>> Hi all,
>>
>> I would have a question on the general procedure, how BlueZ works.
>>
>> My problem is, that the video-file, I will send from Server to mobile 
>> phone, is corrupt. At most, there were transmitted only 9216byte 
>> instead the origin 12913byte. When I let the server sleep for (e.g.)  
>> 60sec. after the video-file (over an OutputStream and 
>> OutputStream.close()) is sent  and before the connection is closed to 
>> the phone, it works. But this is not really a good implementation.
>>
>> So, how does the BlueZ-Stack works. Does it has an puffer, smaller 
>> than 13kbyte or how is the connecton-closing realized? Will be the 
>> connection closed, if such an methode will be called, no matter, 
>> whether there are data in the puffer?
>>
>> Greets Johannes
>>
>>
>> -------------------------------------------------------
>> This SF.Net email is sponsored by BEA Weblogic Workshop
>> FREE Java Enterprise J2EE developer tools!
>> Get your free copy of BEA WebLogic Workshop 8.1 today.
>> http://ads.osdn.com/?ad_id=5047&alloc_id=10808&op=click
>> _______________________________________________
>> Bluez-users mailing list
>> Bluez-users@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/bluez-users
>>
>>
>
>



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Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Michael Schmidt]

Hi Marcel,

Marcel Holtmann schrieb:

<snip>

 > you need at least a HCI 16.4 firmware to get it working. Check my pages
 > and the "hciconfig hci0 revision" command for more information.

Thanks for the info. I'm beginning to understand that I'm scratching
scatternet functionality with my requirements.

Looks like I have to check for a firmware upgrade of my modules (if
available...).


Michael

-- 
===========================================
Michael Schmidt
-------------------------------------------
Institute for Data Communications Systems
University of Siegen, Germany
-------------------------------------------
http:   www.nue.et-inf.uni-siegen.de
===========================================

Re: [Bluez-users] no concurrent inquiry / inquiry scan and L2CAP connection as slave

[Xavier Garreau]

> - perform periodic device inquiries (i.e. search other devices
>    in 'Periodic_Inquiry_Mode')
> - perform inquiry scans (i.e. be visible for other searching devices)

I have _never_ seen a slave connected device answer to an inquiry.
Did some of you actually see this ?

BR, 
-- 
Xavier Garreau <x.garreau@prim-time.fr>
Prim'Time Technology
http://www.prim-time.fr/



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