Re: [PATCH BlueZ] gatt: Fix sending indications with proxy

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Hi, Luiz

With this change, all are working fine via using AcquireWrite and
AcquireNotify now in my end. I have not yet see any issue so far. Any
other concern or better idea?

Thanks
Best wishes
Yunhan

On Wed, Oct 4, 2017 at 7:55 AM, Yunhan Wang <yunhanw@xxxxxxxxxx> wrote:
> Hi, Luiz
>
> On Wed, Oct 4, 2017 at 4:19 AM, Luiz Augusto von Dentz
> <luiz.dentz@xxxxxxxxx> wrote:
>> Hi Yunhan,
>>
>> On Tue, Oct 3, 2017 at 9:35 PM, Yunhan Wang <yunhanw@xxxxxxxxxx> wrote:
>>> When using AcquireNotify with indication, the proxy needs to be filled in
>>> send_notification_to_devices so as to get indication confirmation in
>>> applciation.
>>> ---
>>>  src/gatt-database.c | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/src/gatt-database.c b/src/gatt-database.c
>>> index 0c84b2569..47304704a 100644
>>> --- a/src/gatt-database.c
>>> +++ b/src/gatt-database.c
>>> @@ -1831,7 +1831,7 @@ static bool pipe_io_read(struct io *io, void *user_data)
>>>                                 buf, bytes_read,
>>>                                 gatt_db_attribute_get_handle(chrc->ccc),
>>>                                 chrc->props & BT_GATT_CHRC_PROP_INDICATE,
>>> -                               NULL);
>>> +                               chrc->proxy);
>>>
>>>         return true;
>>>  }
>>> --
>>> 2.14.2.822.g60be5d43e6-goog
>>
>> Im not sure this the correct fix, the reason why the proxy is NULL is
>> because the fd is being used for io, though the confirmation has no
>> effect on the flow control Id expect some inband signalling in this
>> case but that might actually require something like a socketpair in
>> order to be able to write confirmation back.
>>
> I think pipe_io_read should be pretty similar to property_changed_cb
> in https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/gatt-database.c#n2103,
> both are used to handle the written value from application. Therefore,
> send_notification_to_devices should be fine here with proxy. For
> "socketpair", I guess you concern is Confirm? If Confirm is defined in
> application, then confirmation should be able to be sent back to
> application. If Confirm is not defined, it should be also fine in
> https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/src/gatt-database.c#n883.
>> --
>> Luiz Augusto von Dentz
>
> Thanks
> Best wishes
> Yunhan
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