Re: BLE Hexiwear connection fail

Jay Aurabind <jay.aurabind@xxxxxxxxx> · Tue, 23 Aug 2016 11:48:42 +0530

On 22 August 2016 at 16:27, Luiz Augusto von Dentz <luiz.dentz@xxxxxxxxx> wrote:
> Hi Jay, Marcel,
>
> On Mon, Aug 22, 2016 at 11:51 AM, Marcel Holtmann <marcel@xxxxxxxxxxxx> wrote:
>> Hi Jay,
>>
>>> I have the IoT device Hexiwear[1], which connects through BLE. They
>>> have an android app which can take data from it. I want to use from my
>>> linux machine. Its BLE API is provided at their github[2] page.
>>
>> does it work on Android? If so, then enable Bluetooth HCI tracing/logging in Android and send around the /sdcard/btsnoop_hci.log file. You can read that wit btmon by yourself and compare.
>>
>> I would also propose you start using btmon instead of hcidump.
>

Hi Marcell, Luiz,

I took the btsnoop log from Android while the device is being paired.
To my surprise btmon crashes as I scroll down. The file is attached.
The crash is probably a different discussion,  but given below is the
backtrace. Can you please check if the same file crashes your btmon as
well?

#0  0x00007ffff7a4b6f5 in raise () from /lib64/libc.so.6
#1  0x00007ffff7a4d2fa in abort () from /lib64/libc.so.6
#2  0x00007ffff7a8c670 in __libc_message () from /lib64/libc.so.6
#3  0x00007ffff7b2bc57 in __fortify_fail () from /lib64/libc.so.6
#4  0x00007ffff7b29d80 in __chk_fail () from /lib64/libc.so.6
#5  0x00007ffff7b29339 in _IO_str_chk_overflow () from /lib64/libc.so.6
#6  0x00007ffff7a905a0 in __GI__IO_default_xsputn () from /lib64/libc.so.6
#7  0x00007ffff7a635ac in vfprintf () from /lib64/libc.so.6
#8  0x00007ffff7b293cc in __vsprintf_chk () from /lib64/libc.so.6
#9  0x00007ffff7b2931d in __sprintf_chk () from /lib64/libc.so.6
#10 0x000055555558a533 in print_uuid ()
#11 0x0000555555588352 in att_packet ()
#12 0x00005555555888f3 in l2cap_frame ()
#13 0x000055555557f517 in packet_hci_acldata ()
#14 0x000055555557fae7 in packet_monitor ()
#15 0x000055555556a1c6 in control_reader ()
#16 0x00005555555670bc in main ()

> The D-Bus GATT should be able to handle those, if we are able to
> connect, but there seems to be something wrong with the specification
> as it does seems to use UUID range reserved by the SIG instead of
> using proper 128 bits UUIDs.
>

Since I do not know about much bluez stack, are you telling that some
changes needs to be done within the bluez stack so as to connect/pair
to such BLE devices which use  UUIDs reserved by SIG rather than
private ones? And could you please clarify about "something wrong with
the specification" ?

> --
> Luiz Augusto von Dentz

-- 

Thanks and Regards,
Aurabindo J
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