Re: Gatt Client - RegisterApplication options

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Hi Johannes,

On Tue, Jul 5, 2016 at 12:55 PM, Kropf Johannes
<Johannes.Kropf@xxxxxxxxx> wrote:
> Hi Luiz,
>
>>Hi Johannes,
>
>>On Wed, Jun 29, 2016 at 2:50 PM, Kropf Johannes
>><Johannes.Kropf@xxxxxxxxx> wrote:
>>> Dear Luiz,
>>>
>>>Hi Johannes,
>>>
>>>>On Tue, Jun 28, 2016 at 12:24 PM, Kropf Johannes
>>>><Johannes.Kropf@xxxxxxxxx> wrote:
>>>>> Hi,
>>>>>
>>>>> I upgraded to the newest version of bluez (5.40) and noticed that the "RegisterService" method to register the services for a client application is not existing anymore.
>>>>>
>>>>> However, I have troubles using the "RegisterApplication" method since I don't know how to put the profile hierarchy into the requested dict object. It is not clear for me, even after checking doc/gatt->api.txt and the source code.
>>>>> Whatever I try results in the error message "No object received", invoked by the method
>>>>> static void client_ready_cb(GDBusClient *client, void *user_data) in gatt-database.c
>>>
>>>>I suspect that you don't have ObjectManager support, you can check
>>>>tests/example-gatt-server how it is done in python, for other binding
>>>>there should be a similar way to register the ObjectManager interface
>>>>so bluetoothd is able to list the objects.
>>>
>>> The ObjectManager Interface is available under the root of org.bluez, it is used also for finding devices as far as I understand.
>
>>Yep, but in this case we are looking for the ObjectManager in the
>>application side not in bluetoothd.
> Ah ok, I understand. I registered the ObjectManger interface on a separate bus for my application and provided the object. It seems to work so far, but now I get the error message
>
> bluetoothd[4521]: src/gatt-database.c:manager_register_app() Registering application: :1.150:/homer/bluez/client
> bluetoothd[4521]: src/gatt-database.c:proxy_added_cb() Object received: /homer/bluez/client, iface: org.bluez.GattProfile1
> bluetoothd[4521]: Failed to create GATT service entry in local database
>
> My problem is now that I don't know the hierarchy the object manager is expected to provide. I used the following:
> {Path of objectmanager, { 'org.bluez.GattProfile1', {'name': name of profile' , 'UUIDs':, String array of UUIds of services }}},
>
> for example
> {'/homer/bluez/client': {'org.bluez.GattProfile1': {'name': 'WEIGHT_SCALE', 'UUIDs': ['0000181d-0000-1000-8000-00805f9b34fb', '0000180a-0000-1000-8000-00805f9b34fb', '0000181c-0000-1000-8000-00805f9b34fb', '0000181b-0000-1000-8000-00805f9b34fb', '0000180f-0000-1000-8000-00805f9b34fb', '00001805-0000-1000-8000-00805f9b34fb']}}}

org.bluez.GattProfile1 is client side not server, are you sure you did
check the documentation:

https://git.kernel.org/cgit/bluetooth/bluez.git/tree/doc/gatt-api.txt

There is an example of who the hierarchy should looks like:

-> /com/example
  |   - org.freedesktop.DBus.ObjectManager
  |
  -> /com/example/service0
  | |   - org.freedesktop.DBus.Properties
  | |   - org.bluez.GattService1
  | |
  | -> /com/example/service0/char0
  | |     - org.freedesktop.DBus.Properties
  | |     - org.bluez.GattCharacteristic1
  | |
  | -> /com/example/service0/char1
  |   |   - org.freedesktop.DBus.Properties
  |   |   - org.bluez.GattCharacteristic1
  |   |
  |   -> /com/example/service0/char1/desc0
  |       - org.freedesktop.DBus.Properties
  |       - org.bluez.GattDescriptor1
  |
  -> /com/example/service1
    |   - org.freedesktop.DBus.Properties
    |   - org.bluez.GattService1
    |
    -> /com/example/service1/char0
        - org.freedesktop.DBus.Properties
        - org.bluez.GattCharacteristic1


> What is the correct hierarchy for providing the supported profiles of a client application? I couldn't find it anywhere in the doc.
>
>>> The GetManagedObjects() method also works.
>>> Which kind of object does bluetoothd try to find when calling the RegisterApplication method?
>
>>It does call GetManagedObjects, we use that to enumerate the services
>>the application has and then proceed to register them.
> Ok, but see above.
>
> Regards,
> Johannes



-- 
Luiz Augusto von Dentz
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