[Bluez-devel] big SCO packet

[Bluez-devel] big SCO packet

[Luca Pizzamiglio]

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Hi to all.

I've a little question for Steven or Marcel.
In some circumstances, hcidump show me that chip receive SCO packet with
96 byte of dlen, when mtu is 64.

> SCO data: handle 41 dlen 96
> SCO data: handle 47 dlen 96
< SCO data: handle 41 dlen 48
< SCO data: handle 41 dlen 48
< SCO data: handle 47 dlen 48
< SCO data: handle 47 dlen 48

I see this behaviour with my phone or when I connect my dongle with two
devices.
With a headset, received packet dlen is always 48.

How this circumstance occurs?
Why I can't write SCO packet with dlen = 96, but always dlen < mtu?

Thanks in advance for your reply!!

Cheers,
Pizza
- -------------------------------------------
Luca Pizzamiglio
CEFRIEL - Embedded Systems Design Unit
Via Fucini, 2 - 20133 MILANO (ITALY)
Phone:		+39 02 23954 343
e-mail:		pizzamiglio@cefriel.it
ICQ:		5046978
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Re: [Bluez-devel] big SCO packet

[Marcel Holtmann]

Hi Luca,

> I've a little question for Steven or Marcel.

before you expect an answer from Steven you should prove that you are
using a CSR based device ;)

Regards

Marcel




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Re: [Bluez-devel] big SCO packet

[Luca Pizzamiglio]

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Ok. This is the proof!

hci0:   Type: USB
        BD Address: xx:xx:xx:xx:xx:xx ACL MTU: 192:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:117 acl:0 sco:0 events:15 errors:0
        TX bytes:310 acl:0 sco:0 commands:14 errors:0
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy:
        Link mode: SLAVE ACCEPT
        Name: 'Thor (0)'
        Class: 0x3e0100
        Service Classes: Networking, Rendering, Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 1.1 (0x1) HCI Rev: 0x460 LMP Ver: 1.1 (0x1) LMP Subver:
0x460
        Manufacturer: Cambridge Silicon Radio (10)


Cheers,
Pizza

Marcel Holtmann wrote:
> Hi Luca,
> 
> 
>>I've a little question for Steven or Marcel.
> 
> 
> before you expect an answer from Steven you should prove that you are
> using a CSR based device ;)
> 
> Regards
> 
> Marcel

- -------------------------------------------
Luca Pizzamiglio
CEFRIEL - Embedded Systems Design Unit
Via Fucini, 2 - 20133 MILANO (ITALY)
Phone:		+39 02 23954 343
e-mail:		pizzamiglio@cefriel.it
ICQ:		5046978
- -------------------------------------------
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