[Bluez-devel] Immediate disconnect after doing "hcitool cc"

Jon Barnett

author

2006-12-14 06:13 UTC #0 lore raw

I have problems with the Broadcom BCM2045 connecting to a Sony-Ericcson headset (HBH-610a). It connects but it then immediately disconnects. This does not occur when using a Kensington USB bluetooth dongle so I know that connecting to the headset is possible.

USB device info:

T:  Bus=05 Lev=02 Prnt=02 Port=03 Cnt=01 Dev#=  6 Spd=12  MxCh= 0
D:  Ver= 2.00 Cls=e0(unk. ) Sub=01 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=413c ProdID=8126 Rev= 1.00
S:  Manufacturer=Broadcom Corp
S:  Product=BCM2045
C:* #Ifs= 4 Cfg#= 1 Atr=e0 MxPwr=  0mA
I:  If#= 0 Alt= 0 #EPs= 3 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=81(I) Atr=03(Int.) MxPS=  16 Ivl=1ms
E:  Ad=82(I) Atr=02(Bulk) MxPS=  64 Ivl=0ms
E:  Ad=02(O) Atr=02(Bulk) MxPS=  64 Ivl=0ms
I:  If#= 1 Alt= 0 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   0 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   0 Ivl=1ms
I:  If#= 1 Alt= 1 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=   9 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=   9 Ivl=1ms
I:  If#= 1 Alt= 2 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  17 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  17 Ivl=1ms
I:  If#= 1 Alt= 3 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  32 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  32 Ivl=1ms
I:  If#= 1 Alt= 4 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  64 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  64 Ivl=1ms
I:  If#= 1 Alt= 5 #EPs= 2 Cls=e0(unk. ) Sub=01 Prot=01 Driver=hci_usb
E:  Ad=83(I) Atr=01(Isoc) MxPS=  64 Ivl=1ms
E:  Ad=03(O) Atr=01(Isoc) MxPS=  64 Ivl=1ms
I:  If#= 2 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E:  Ad=84(I) Atr=02(Bulk) MxPS=  32 Ivl=0ms
E:  Ad=04(O) Atr=02(Bulk) MxPS=  32 Ivl=0ms
I:  If#= 3 Alt= 0 #EPs= 0 Cls=fe(app. ) Sub=01 Prot=00 Driver=(none)

hcidump -X -V results for a hcitool cc command:
< HCI Command: Create Connection (0x01|0x0005) plen 13
bdaddr 00:12:EE:E0:AB:CA ptype 0xcc18 rswitch 0x01 clkoffset 0x0000 Packet type: DM1 DM3 DM5 DH1 DH3 DH5

Quoted 1 line

HCI Event: Command Status (0x0f) plen 4

    Create Connection (0x01|0x0005) status 0x00 ncmd 1

Quoted 1 line

HCI Event: Connect Complete (0x03) plen 11

    status 0x00 handle 12 bdaddr 00:12:EE:E0:AB:CA type ACL encrypt 0x00

< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2
handle 12

Quoted 1 line

HCI Event: Command Status (0x0f) plen 4

    Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 1

< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
handle 12 policy 0x0f
Link policy: RSWITCH HOLD SNIFF PARK

Quoted 1 line

HCI Event: Read Remote Supported Features (0x0b) plen 11

    status 0x00 handle 12
    Features: 0xff 0xfd 0x29 0x78 0x18 0x18 0x00 0x80

Quoted 1 line

HCI Event: Command Complete (0x0e) plen 6

    Write Link Policy Settings (0x02|0x000d) ncmd 1
    status 0x00 handle 12
< HCI Command: Remote Name Request (0x01|0x0019) plen 10
    bdaddr 00:12:EE:E0:AB:CA mode 2 clkoffset 0x0000

Quoted 1 line

HCI Event: Command Status (0x0f) plen 4

    Remote Name Request (0x01|0x0019) status 0x00 ncmd 1

Quoted 1 line

HCI Event: Max Slots Change (0x1b) plen 3

handle 12 slots 5

Quoted 1 line

HCI Event: Remote Name Req Complete (0x07) plen 255

    status 0x00 bdaddr 00:12:EE:E0:AB:CA name 'HBH-610a'

< HCI Command: Disconnect (0x01|0x0006) plen 3
handle 12 reason 0x13
Reason: Remote User Terminated Connection

Quoted 1 line

HCI Event: Command Status (0x0f) plen 4

    Disconnect (0x01|0x0006) status 0x00 ncmd 1

Quoted 1 line

HCI Event: Disconn Complete (0x05) plen 4

status 0x00 handle 12 reason 0x16
Reason: Connection Terminated by Local Host

Is there something else I need to do to get this to work? Any help would be appreciated.

Thanks,

JonB

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amateur

2006-12-14 09:25 UTC #1 lore raw

Quoted 29 lines · Jon Barnett

hcidump -X -V results for a hcitool cc command:
< HCI Command: Create Connection (0x01|0x0005) plen 13
bdaddr 00:12:EE:E0:AB:CA ptype 0xcc18 rswitch 0x01 clkoffset 0x0000 Packet type: DM1 DM3 DM5 DH1 DH3 DH5
Quoted 1 line
HCI Event: Command Status (0x0f) plen 4
    Create Connection (0x01|0x0005) status 0x00 ncmd 1
Quoted 1 line
HCI Event: Connect Complete (0x03) plen 11
    status 0x00 handle 12 bdaddr 00:12:EE:E0:AB:CA type ACL encrypt 0x00
< HCI Command: Read Remote Supported Features (0x01|0x001b) plen 2
handle 12
Quoted 1 line
HCI Event: Command Status (0x0f) plen 4
    Read Remote Supported Features (0x01|0x001b) status 0x00 ncmd 1
< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
handle 12 policy 0x0f
Link policy: RSWITCH HOLD SNIFF PARK
Quoted 1 line
HCI Event: Read Remote Supported Features (0x0b) plen 11
    status 0x00 handle 12
    Features: 0xff 0xfd 0x29 0x78 0x18 0x18 0x00 0x80
Quoted 1 line
HCI Event: Command Complete (0x0e) plen 6
    Write Link Policy Settings (0x02|0x000d) ncmd 1
    status 0x00 handle 12
< HCI Command: Remote Name Request (0x01|0x0019) plen 10
    bdaddr 00:12:EE:E0:AB:CA mode 2 clkoffset 0x0000
Quoted 1 line
HCI Event: Command Status (0x0f) plen 4
    Remote Name Request (0x01|0x0019) status 0x00 ncmd 1
Quoted 1 line
HCI Event: Max Slots Change (0x1b) plen 3
handle 12 slots 5
Quoted 1 line
HCI Event: Remote Name Req Complete (0x07) plen 255
    status 0x00 bdaddr 00:12:EE:E0:AB:CA name 'HBH-610a'

Quoted 9 lines

< HCI Command: Disconnect (0x01|0x0006) plen 3
handle 12 reason 0x13
Reason: Remote User Terminated Connection
Quoted 1 line
HCI Event: Command Status (0x0f) plen 4
    Disconnect (0x01|0x0006) status 0x00 ncmd 1
Quoted 1 line
HCI Event: Disconn Complete (0x05) plen 4
status 0x00 handle 12 reason 0x16
Reason: Connection Terminated by Local Host

How long does it takes for your computer to send the disconnect request? Maybe it is that bluez will automatically disconnect a connection after some idle time.

Signature · 12 lines

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		-- William Shakespeare, "Henry VI"

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Jon Barnett

author

2006-12-15 02:05 UTC #2 lore raw

Quoted 10 lines · amateur

Quoted 9 lines · Jon Barnett
hcidump -X -V results for a hcitool cc command:
Quoted 1 line
HCI Event: Max Slots Change (0x1b) plen 3
handle 12 slots 5
Quoted 1 line
HCI Event: Remote Name Req Complete (0x07) plen 255
    status 0x00 bdaddr 00:12:EE:E0:AB:CA name 'HBH-610a'
< HCI Command: Disconnect (0x01|0x0006) plen 3
handle 12 reason 0x13
Reason: Remote User Terminated Connection
Quoted 1 line
HCI Event: Command Status (0x0f) plen 4

Quoted 9 lines

Quoted 5 lines
    Disconnect (0x01|0x0006) status 0x00 ncmd 1
Quoted 1 line
HCI Event: Disconn Complete (0x05) plen 4
status 0x00 handle 12 reason 0x16
Reason: Connection Terminated by Local Host
How long does it takes for your computer to send the disconnect request? Maybe it is that bluez will automatically disconnect a connection after some idle time.

No. The disconnect happens at most maybe a couple of seconds after the cc command has completed. I've tried:
hcitool cc 00:12:EE:E0:AB:CA; hcitool auth 00:12:EE:E0:AB:CA

And it disconnects before I can even enter the pin at the gnome-bluetooth prompt.

As I said, it doesn't happen if I use the Kensington USB dongle. So there is something different about the BCM2045 USB device.

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Marcel Holtmann

maintainer

2006-12-17 12:43 UTC #3 lore raw

Hi Jon,

Quoted 3 lines

No. The disconnect happens at most maybe a couple of seconds after the cc command has completed. I've tried:
hcitool cc 00:12:EE:E0:AB:CA; hcitool auth 00:12:EE:E0:AB:CA

don't use "hcitool cc" for connecting devices. This command is not for general purpose use. Let the kernel create you low-level ACL, because it knows what to do.

Regards

Marcel

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Jon Barnett

author

2006-12-17 17:37 UTC #4 lore raw

Thanks for the response. I'm unsure about how the ACL is created and how I then do the auth to pair the devices. Is there any documentation as I've just been going through the list of quoted documentation at the bluez site and every thing I've read so far always talks about doing the cc?

I remember that with running btsco it would do all the pairing and prompt for the pin through the gnome-bluetooth applet. Is that what is meant by the kernel doing the low-level ACL? The only thing is I haven't looked back at compiling the code with kernel 2.6.19 - I think I had some problems compiling the device module against the kernel so I will need to review that again. It throws up an error - btsco.c:127: error:
syntax error before "snd_card_t" as the first before a whole lot more warnings and errors.

Cheers,

JonB.

Quoted 6 lines · Marcel Holtmann

Hi Jon,
Quoted 3 lines
No. The disconnect happens at most maybe a couple of seconds after the cc command has completed. I've tried:
hcitool cc 00:12:EE:E0:AB:CA; hcitool auth 00:12:EE:E0:AB:CA

Quoted 7 lines

don't use "hcitool cc" for connecting devices. This command is not for general purpose use. Let the kernel create you low-level ACL, because it knows what to do.
Regards
Marcel

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Lauri Lubi

2006-12-18 08:00 UTC #5 lore raw

In reply to Marcel Holtmann

Hello,

Is there more information available how the kernel creates an ACL connection? I have been reading source code for 2.6.13-15 but not seen anything about creating an ACL connection yet. Well, I am quite unfamiliar with the kernel source code.

I have re-written some parts of hcitool so that it uses clock_offset and pscan_repetition_mode when ACL-connecting. Is kernel code more optimised that this?

Q2: Any ideas for a good way to time kernel creating the ACL connection? So that to compare with a "hacked" hcitool.

Mvh
Lauri Lubi
Mob +46 730 39 31 00
=

-----Ursprungligt meddelande-----
Fr=E5n: [email protected] [mailto:[email protected]] F=F6r Marcel Holtmann
Skickat: den 17 december 2006 13:44
Till: [email protected]; BlueZ development
=C4mne: Re: [Bluez-devel] Immediate disconnect after doing "hcitool cc"

Hi Jon,

Quoted 3 lines

No. The disconnect happens at most maybe a couple of seconds after the cc command has completed. I've tried:
hcitool cc 00:12:EE:E0:AB:CA; hcitool auth 00:12:EE:E0:AB:CA

don't use "hcitool cc" for connecting devices. This command is not for general purpose use. Let the kernel create you low-level ACL, because it knows what to do.

Regards

Marcel

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Marcel Holtmann

maintainer

2006-12-18 09:36 UTC #6 lore raw

Hi,

Quoted 11 lines

Is there more information available how the kernel creates an ACL connection? I have been reading source code for 2.6.13-15 but not seen anything about creating an ACL connection yet. Well, I am quite unfamiliar with the kernel source code.
I have re-written some parts of hcitool so that it uses clock_offset and pscan_repetition_mode when ACL-connecting. Is kernel code more optimised that this?
Q2: Any ideas for a good way to time kernel creating the ACL connection? So that to compare with a "hacked" hcitool.

this is all the wrong approach. Create a L2CAP or RFCOMM connection and the kernel will create any needed ACL link for you. Don't try to think to complicate. If you try to mess around with connection reference counting of the ACL the kernel will always win and simply disconnect the link if it thinks it is no longer needed. Messing around directly with HCI is never a good idea.

Regards

Marcel

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Lauri Lubi

2006-12-18 09:52 UTC #7 lore raw

Well, I'm a man in a bad need of performance and have to create ACL connections in the most optimized way. The current tests (hcidump) have unfortunately showed that the Linux kernel (2.5.16) does make use of pscan_repetition_mode, not sure about the clock_offset. Inquiry scan has been done just seconds before connection attempts.

With this background I guess there are 2 ways out: messing with HCI directly and taking the risk of kernel overriding me; or re-writing some Bluetooth/sockets code in the kernel. Do you agree?

Does anybody have some good hints for where to start in the kernel source tree? I would like to try modifying how the kernel creates an ACL connection, and if some options (clock_offset and pscan_rep_mode) can be passed to it. I guess that bluez-libs has nothing to do with how the kernel implements HCI_CREATE_CONNECTION?

Mvh
Lauri Lubi
Mob +46 730 39 31 00
=

-----Ursprungligt meddelande-----
Fr=E5n: [email protected] [mailto:[email protected]] F=F6r Marcel Holtmann
Skickat: den 18 december 2006 10:37
Till: BlueZ development
=C4mne: Re: [Bluez-devel] Immediate disconnect after doing "hcitool cc"

Hi,

Quoted 6 lines

Is there more information available how the kernel creates an ACL connection? I have been reading source code for 2.6.13-15 but not seen anything about creating an ACL connection yet. Well, I am quite unfamiliar with the kernel source code.
=

Quoted 6 lines

I have re-written some parts of hcitool so that it uses clock_offset and pscan_repetition_mode when ACL-connecting. Is kernel code more optimised that this?
=
Q2: Any ideas for a good way to time kernel creating the ACL connection?

So

Quoted 1 line

that to compare with a "hacked" hcitool.

this is all the wrong approach. Create a L2CAP or RFCOMM connection and the kernel will create any needed ACL link for you. Don't try to think to complicate. If you try to mess around with connection reference counting of the ACL the kernel will always win and simply disconnect the link if it thinks it is no longer needed. Messing around directly with HCI is never a good idea.

Regards

Marcel

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Marcel Holtmann

maintainer

2006-12-18 11:55 UTC #8 lore raw

Hi Lauri,

Quoted 9 lines

Well, I'm a man in a bad need of performance and have to create ACL connections in the most optimized way. The current tests (hcidump) have unfortunately showed that the Linux kernel (2.5.16) does make use of pscan_repetition_mode, not sure about the clock_offset. Inquiry scan has been done just seconds before connection attempts.
With this background I guess there are 2 ways out: messing with HCI directly and taking the risk of kernel overriding me; or re-writing some Bluetooth/sockets code in the kernel. Do you agree?

that is all crap. The kernel is the fastest way to create the ACL. There is no other way, because the kernel has all needed information and keeps them up-to-date. So don't even try to accomplish something that is impossible to achieve.

Regards

Marcel

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