Re: [Bluez-users] SDP problems on embedded device

[Marcel Holtmann <marcel@holtmann.org>]

Hi Rolf,

> I have some problems with sdp on a Intrinsyc Cerfcube 255 
> (http://www.intrinsyc.com/products/cerfcube/) running a Linux 2.4.19 
> kernel patched with the mh17-patch (and some platform specific patches).
> 
> The problem is that I can't get to discover anything on the device. I 
> have tried with two mobile phones, and a laptop running RH 9.0.
> 
>  From the laptop I either try 'spdtool browse bdaddr' or 'sdptool search 
> SP' after adding SP service to the SDP record of the Cerfcube. I am able 
> to browse the service record of the mobile phone, but not the Cerfcube. 
> The output could be: 'Failed to connect to SDP server on 
> 00:0A:94:00:20:2A: Resource temporarily unavailable'. Other reasons I 
> have experienced are:  'Host is down', 'Connection timed out', and 
> 'Connection refused'.
> 
> My final goal is to make a connection (SP profile) between a Midlet 
> running on a Nokia 6600 and the Cerfcube. I have tested this setup with 
> the laptop and the phone and it works. But this will only work if 
> service discovery works.
> 
> At first I thought that maybe the problem was caused by using old 
> versions of bluez on the Cerfcube, but I have just cross-compiled and 
> installed bluez-2.8 (lib and utils) and the situation is the same.
> 
> Here's the output from 'hcidump -x' from the Cerfcube when trying 
> 'sdptool browse' from the laptop.
> 
> HCIDump - HCI packet analyzer ver 1.9
> device: hci0 snap_len: 1028 filter: 0xffffffff
>  > HCI Event: Connect Request (0x04) plen 10
>    74 05 B1 76 0C 00 00 01 00 01
> < HCI Command: Accept Connection Request (0x01|0x0009) plen 7
>    74 05 B1 76 0C 00 01
>  > HCI Event: Command Status (0x0f) plen 4
>    00 01 09 04
>  > HCI Event: Connect Complete (0x03) plen 11
>    00 29 00 74 05 B1 76 0C 00 01 00
> < HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
>    29 00 0F 00
>  > HCI Event: Page Scan Repetition Mode Change (0x20) plen 7
>    74 05 B1 76 0C 00 01
>  > HCI Event: Command Complete (0x0e) plen 6
>    01 0D 08 00 29 00
> < HCI Command: Change Connection Packet Type (0x01|0x000f) plen 4
>    29 00 18 CC
>  > HCI Event: Max Slots Change (0x1b) plen 3
>    29 00 05
>  > HCI Event: Command Status (0x0f) plen 4
>    00 01 0F 04
>  > HCI Event: Connection Packet Type Changed (0x1d) plen 5
>    00 29 00 18 CC
>  > ACL data: handle 0x0029 flags 0x02 dlen 12
>      L2CAP(s): Connect req: psm 1 scid 0x0040
> < ACL data: handle 0x0029 flags 0x02 dlen 16
>      L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0
>  > HCI Event: Number of Completed Packets (0x13) plen 5
>    01 29 00 01 00
>  > ACL data: handle 0x0029 flags 0x02 dlen 12
>      L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 0
> < ACL data: handle 0x0029 flags 0x02 dlen 14
>      L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
> < ACL data: handle 0x0029 flags 0x02 dlen 12
>      L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 0
>  > HCI Event: Number of Completed Packets (0x13) plen 5
>    01 29 00 01 00
>  > ACL data: handle 0x0029 flags 0x02 dlen 12
>      L2CAP(s): Disconn req: dcid 0x0040 scid 0x0040
> < ACL data: handle 0x0029 flags 0x02 dlen 12
>      L2CAP(s): Disconn rsp: dcid 0x0040 scid 0x0040
>  > HCI Event: Number of Completed Packets (0x13) plen 5
>    01 29 00 01 00
>  > HCI Event: Disconn Complete (0x05) plen 4
>    00 29 00 13
> 
> I'm using a USB bluetooth dongle for both the Cerfcube and the laptop.
> 
> So, what to do next?

looks like a kernel or scheduling bug. Run "hcidump -x -t" on both sides
so we can compare the data flow and the timestamps.

Regards

Marcel




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