[Bluez-users] Bluetooth connection too slow

[Mario Demontis <mario.demontis@email.it>]

Hello
I recently bought a Bluetooth 2.0 EDR USB adapter (Trust, BT-2200Tp),
because I wanted to try it out with my new Motorola E1070 (UMTS phone).

I tried it out with my Ubuntu linux. The device has been recognized
properly. Then I tried the Internet connection (with UMTS you can have
more than 30 kBytes/s). Unfortunately all I could see was a transfer
rate (taken with wget downloading the kernel sources from a fast mirror)
of about 9 kB/s. I also tried to do the same with Windows XP and there
the transfer rate reached about 32 kB/s!! I did the same several times
and all the times I had the same results.
Furthermore, I tried to do the same under Linux with a USB connection,
and I'm getting 32kB/s as well. This brought me to think the bottleneck
is in the BT connection.

This is how I'm setting the BT connection:
$ sudo hcitool cc --role=m 00:0E:A1:45:1F:AE
$ sudo hcitool auth 00:0E:A1:45:1F:AE
$ sudo rfcomm bind 00:0E:A1:45:1F:AE
$ sudo ln -sf /dev/rfcomm0 /dev/modem

To dial I'm using exactly the same procedure as when using the USB
connection (with kppp).

I'm wondering if I need to tweak some parameter of the bluetooth
connection. hciconfig gives me many info but I don't know how to
interpret them and what options to give (where can I find
documentation?).
Here is what I'm getting with hciconfig:
$ hciconfig hci0 -a
hci0:   Type: USB
        BD Address: 00:0E:A1:45:1F:AE ACL MTU: 1017:8  SCO MTU: 64:0
        UP RUNNING PSCAN ISCAN
        RX bytes:466 acl:0 sco:0 events:27 errors:0
        TX bytes:378 acl:0 sco:0 commands:21 errors:0
        Features: 0xff 0xff 0x8d 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'agnello-0'
        Class: 0x100100
        Service Classes: Object Transfer
        Device Class: Computer, Uncategorized
        HCI Ver: 2.0 (0x3) HCI Rev: 0x2902 LMP Ver: 2.0 (0x3) LMP
Subver: 0x4127
        Manufacturer: Broadcom Corporation (15)

Does anyone have some suggestion in order to help me to configure
properly my BT dongle?

Thanks
Mario



 

 

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