[Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marco Pracucci]

Hi,

I need to be sure that an SDP connection does not take more than X
seconds. In order to achieve my goal, I have correctly set the page
timeout of my local device. However, if I'm right, the page timeout is
the max time the local Link Manager will wait for a baseband page
response. But what does it happen if the page request is successfully
completed and an error occur during the connection to L2CAP remote
"layer"? Is there a timeout for this? Maybe L2CAP_CONN_TIMEOUT...

I have posted this message, because practical experiments demonstrate
that sometimes the sdp_connect() timeout expires after 40 seconds.

Have you any idea and/or suggestion?

Thanks,
Marco Pracucci


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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marcel Holtmann]

Hi Marco,

> I need to be sure that an SDP connection does not take more than X
> seconds. In order to achieve my goal, I have correctly set the page
> timeout of my local device. However, if I'm right, the page timeout is
> the max time the local Link Manager will wait for a baseband page
> response. But what does it happen if the page request is successfully
> completed and an error occur during the connection to L2CAP remote
> "layer"? Is there a timeout for this? Maybe L2CAP_CONN_TIMEOUT...
> 
> I have posted this message, because practical experiments demonstrate
> that sometimes the sdp_connect() timeout expires after 40 seconds.

run "hcidump -X -V" to check what timeout you really run into.

Regards

Marcel



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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marco Pracucci]

Hi Marcel,

I have dump it (hcidump -i hci1 -t -X -V). Here I publish only
interesting commands and events:

2006-08-10 11:10:51.168745 < HCI Command: Create Connection
(0x01|0x0005) plen 13
bdaddr 00:07:80:81:03:E0 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
Packet type: DM1 DM3 DM5 DH1 DH3 DH5
2006-08-10 11:10:51.171492 > HCI Event: Command Status (0x0f) plen 4
Create Connection (0x01|0x0005) status 0x00 ncmd 1

2006-08-10 11:10:54.773623 > HCI Event: Role Change (0x12) plen 8
status 0x00 bdaddr 7B:00:00:01:C3:E0 role 0x00
Role: Master
2006-08-10 11:10:54.921650 > HCI Event: Connect Complete (0x03) plen 11
status 0x21 handle 1 bdaddr 7B:00:00:01:C3:E0 type ACL encrypt 0x00
Error: Role Change Not Allowed

No other related event has been received, but the connect() system call
returns after 40 seconds (2006-08-10 11:11:31). Have you any idea and/or
suggestion?

Marco Pracucci


P.S. bdaddr 7B:00:00:01:C3:E0 is wrong: is it a little bug of hcidump?

>> I need to be sure that an SDP connection does not take more than X
>> seconds. In order to achieve my goal, I have correctly set the page
>> timeout of my local device. However, if I'm right, the page timeout is
>> the max time the local Link Manager will wait for a baseband page
>> response. But what does it happen if the page request is successfully
>> completed and an error occur during the connection to L2CAP remote
>> "layer"? Is there a timeout for this? Maybe L2CAP_CONN_TIMEOUT...
>>
>> I have posted this message, because practical experiments demonstrate
>> that sometimes the sdp_connect() timeout expires after 40 seconds.
>>     
>
> run "hcidump -X -V" to check what timeout you really run into.
>   


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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marcel Holtmann]

Hi Marco,

> I have dump it (hcidump -i hci1 -t -X -V). Here I publish only
> interesting commands and events:
> 
> 2006-08-10 11:10:51.168745 < HCI Command: Create Connection
> (0x01|0x0005) plen 13
> bdaddr 00:07:80:81:03:E0 ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
> Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> 2006-08-10 11:10:51.171492 > HCI Event: Command Status (0x0f) plen 4
> Create Connection (0x01|0x0005) status 0x00 ncmd 1
> 
> 2006-08-10 11:10:54.773623 > HCI Event: Role Change (0x12) plen 8
> status 0x00 bdaddr 7B:00:00:01:C3:E0 role 0x00
> Role: Master
> 2006-08-10 11:10:54.921650 > HCI Event: Connect Complete (0x03) plen 11
> status 0x21 handle 1 bdaddr 7B:00:00:01:C3:E0 type ACL encrypt 0x00
> Error: Role Change Not Allowed
> 
> No other related event has been received, but the connect() system call
> returns after 40 seconds (2006-08-10 11:11:31). Have you any idea and/or
> suggestion?
> 
> P.S. bdaddr 7B:00:00:01:C3:E0 is wrong: is it a little bug of hcidump?

I don't know of any bug in hcidump. What version are you using. If the
address is displayed wrong then actually the wrong address might be
used.

Regards

Marcel



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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marco Pracucci]

Hi Marcel,
>> 2006-08-10 11:10:54.773623 > HCI Event: Role Change (0x12) plen 8
>> status 0x00 bdaddr 7B:00:00:01:C3:E0 role 0x00
>> Role: Master
>> 2006-08-10 11:10:54.921650 > HCI Event: Connect Complete (0x03) plen 11
>> status 0x21 handle 1 bdaddr 7B:00:00:01:C3:E0 type ACL encrypt 0x00
>> Error: Role Change Not Allowed
>>
>> P.S. bdaddr 7B:00:00:01:C3:E0 is wrong: is it a little bug of hcidump?
>>     
>
> I don't know of any bug in hcidump. What version are you using. If the
> address is displayed wrong then actually the wrong address might be
> used.
>   

hcidump version: 1.30
Bluez libs: 2.25

If it's not an hcidump bug, it could be a protocol stack. Since the
remote device implements a closed/proprietary Bluetooth stack (from
BlueGiga Technologies), it could be a bug of it.

What do you think? Have you any other suggestion?


Regards,
Marco Pracucci


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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marcel Holtmann]

Hi Marco,

> >> 2006-08-10 11:10:54.773623 > HCI Event: Role Change (0x12) plen 8
> >> status 0x00 bdaddr 7B:00:00:01:C3:E0 role 0x00
> >> Role: Master
> >> 2006-08-10 11:10:54.921650 > HCI Event: Connect Complete (0x03) plen 11
> >> status 0x21 handle 1 bdaddr 7B:00:00:01:C3:E0 type ACL encrypt 0x00
> >> Error: Role Change Not Allowed
> >>
> >> P.S. bdaddr 7B:00:00:01:C3:E0 is wrong: is it a little bug of hcidump?    
> >
> > I don't know of any bug in hcidump. What version are you using. If the
> > address is displayed wrong then actually the wrong address might be
> > used.
> 
> hcidump version: 1.30
> Bluez libs: 2.25
> 
> If it's not an hcidump bug, it could be a protocol stack. Since the
> remote device implements a closed/proprietary Bluetooth stack (from
> BlueGiga Technologies), it could be a bug of it.
> 
> What do you think? Have you any other suggestion?

it must be actually a bug on our side. I actually trust hcidump to do
the right thing and this means that somehow the wrong address gets used.
Please include some more information about your system and kernel
version you use. You should also create a binary dump in BTSnoop format.

Regards

Marcel



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Re: [Bluez-devel] connect() and L2CAP_CONN_TIMEOUT

[Marco Pracucci]

Hi Marcel,

>>> I need to be sure that an SDP connection does not take more than X
>>> seconds. In order to achieve my goal, I have correctly set the page
>>> timeout of my local device. However, if I'm right, the page timeout is
>>> the max time the local Link Manager will wait for a baseband page
>>> response. But what does it happen if the page request is successfully
>>> completed and an error occur during the connection to L2CAP remote
>>> "layer"? Is there a timeout for this? Maybe L2CAP_CONN_TIMEOUT...
>>>
>>> I have posted this message, because practical experiments demonstrate
>>> that sometimes the sdp_connect() timeout expires after 40 seconds.
>>>     
>>>       
>> run "hcidump -X -V" to check what timeout you really run into.
>>     

I have resolved the connect() timeout problem, setting two socket
options before connect() system call: SO_SNDTIMEO, SO_RCVTIMEO. Now, it
seems to work fine.

Marco Pracucci


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