[Bluez-users] PAN and RFCOMM

[Bluez-users] PAN and RFCOMM

[mike lee]

Dear all
   I am writing a file transfer program though rfcomm to my device. But
I found that whenever my device connected with a bluetooth access point,
the connect/transfer/disconnect actions are all very slow. Is it the
restriction on the bluetooth protocol/baseband or i should set something
before any connections?

Here is the result of hciconfig -a
hci0:   Type: UART
        BD Address: 00:08:E0:04:A4:BF ACL MTU: 192:8  SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:373706 acl:4542 sco:0 events:1669 errors:0
        TX bytes:323342 acl:2083 sco:0 commands:85 errors:0
        Features: 0xff 0xff 0x0f 0x00 0x00 0x00 0x00 0x00
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'testing'
        Class: 0x080100
        Service Classes: Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 1.1 (0x1) HCI Rev: 0x20d LMP Ver: 1.1 (0x1) LMP Subver:
0x20d
        Manufacturer: Cambridge Silicon Radio (10)

THX
Mike,Lee


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Re: [Bluez-users] PAN and RFCOMM

[Marcel Holtmann]

Hi,

>    I am writing a file transfer program though rfcomm to my device. But
> I found that whenever my device connected with a bluetooth access point,
> the connect/transfer/disconnect actions are all very slow. Is it the
> restriction on the bluetooth protocol/baseband or i should set something
> before any connections?

this can be and depends on the chips of the other devices. However the
HCI 16.4 of your local adapter is not bad, but still quite old.

Regards

Marcel




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Re: [Bluez-users] PAN and RFCOMM

[mike lee]

Hi Marcel

Marcel Holtmann wrote:

>Hi,
>
>  
>
>>   I am writing a file transfer program though rfcomm to my device. But
>>I found that whenever my device connected with a bluetooth access point,
>>the connect/transfer/disconnect actions are all very slow. Is it the
>>restriction on the bluetooth protocol/baseband or i should set something
>>before any connections?
>>    
>>
>
>this can be and depends on the chips of the other devices.
>
    That means it is restricted by the CSR chip. It is too bad

> However the
>HCI 16.4 of your local adapter is not bad, but still quite old.
>  
>
    I am now using 2.12 utils. I will change it later
    Because it seem to be a problem on bluetooth architechure, I choose
to turn bnep off whenever there is rfcomm connection. But i find that
when i disconnect bnep several time by "pand -K" a kernel error message
come out "unregister_netdevice: waiting for bnep0 to become free. Usage
count = 1".
    Do i need to close all the network application first?

Thx for helping
Mike,Lee

>Regards
>
>Marcel
>
>
>
>
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>  
>



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Re: [Bluez-users] PAN and RFCOMM

[Marcel Holtmann]

Hi,

> >this can be and depends on the chips of the other devices.
> >
>     That means it is restricted by the CSR chip. It is too bad

it can be, but in general using CSR chips are less problematic.

>     I am now using 2.12 utils. I will change it later
>     Because it seem to be a problem on bluetooth architechure, I choose
> to turn bnep off whenever there is rfcomm connection. But i find that
> when i disconnect bnep several time by "pand -K" a kernel error message
> come out "unregister_netdevice: waiting for bnep0 to become free. Usage
> count = 1".
>     Do i need to close all the network application first?

If you wanna make this error go away, then yes.

Regards

Marcel




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