Re: Registering a GATT service via DBus

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Hi Edmund,

On Wed, Aug 12, 2015 at 12:16 PM, Urbani, Edmund
<edmund.urbani@xxxxxxxxxxxx> wrote:
> On 08/12/2015 10:02 AM, Anupam Roy wrote:
>>
>> Hi Edmund,
>>
>>>
>>> Hello,
>>>
>>> my attempts to register a GATT service via DBus from Java have so far
>>> been unsuccessful. The GattManager1.RegisterService method does not
>>> return any reply, instead I simply get this timeout exception:
>>> Exception in thread "main" org.freedesktop.DBus$Error$
>>> NoReply: No reply within specified time
>>>
>> As I understand, RegisterService DBUS method in gatt-database replies back
>> to
>> client only when client is fully ready. It happens when service is
>> successfully created
>> by gatt-database and all managed objects are successfully retrieved from
>> client
>> service and parsed by gdbus/client.c.
>>
>>> Also, all I see in the logs is the registration attempt, but no error:
>>> Aug 11 14:42:02 raspberrypi bluetoothd[5466]:
>>> src/gatt-database.c:manager_register_service() Registering service -
>>> path: /com/lilandit/iventcloud/skg/service
>>>
>> This print only only suggests that external service is created by
>> gatt-database
>>
>>> Introspection of the service (with mdbus2 tool) shows this info (which
>>> matches the specs as far as a DBus noob like I can tell):
>>> [METHOD]   org.bluez.GattService1.GetPrimary() -> (b:arg_0)
>>> [METHOD]   org.bluez.GattService1.GetDevice() -> (o:arg_0)
>>> [METHOD]   org.bluez.GattService1.GetUUID() -> (s:arg_0)
>>> [METHOD]   org.bluez.GattService1.GetCharacteristics() -> (ao:arg_0)
>>> [METHOD]   org.bluez.GattService1.GetIncludes() -> (ao:arg_0)
>>> [METHOD]   org.freedesktop.DBus.Introspectable.Introspect() -> (s:arg_0)
>>> [METHOD]   org.freedesktop.DBus.Peer.Ping() -> ()
>>>
>>> The implementation of the service is incomplete (same applies to the
>>> ObjectManager registered at "/"), however I was expecting to at least
>>> get some feedback on registration and possibly see some of the service
>>> methods being called at this point. Instead I get nothing.
>>>
>>> Any ideas what may be wrong or where I should be looking for the cause?
>>>
>> According to GATT API doc, client service should export ObjectManager
>> interface
>> on its client root path. If this is not done, then I think
>> GetManagedObjects call from gdbus/client will fail and client ready
>> will not be invoked and possibly DBUS timeout occurs.
>>
>> Is your service exporting ObjectManager interface on service root path?
>>
>>> Kind regards,
>>> Edmund
>>>
>>> PS: I'm using BlueZ 5.32
>>
>>
> I think I need to clarify that I have exported two objects. The
> ObjectManager (path "/" with interface org.freedesktop.DBus.ObjectManager),
> and the GattService (path "/com/lilandit/iventcloud/skg/service" with
> interface org.bluez.GattService1). Is this OK, or should I have one object
> that implements both interfaces?

We expect ObjectManager to be in the path where the GattService is in in '/'.

> Note that GetManagedObjects is never called (nor are any other methods I
> implemented, each of which has a log statement right there in the first
> line).

Because ObjectManager interface is in a different path which
bluetoothd has no idea of.


-- 
Luiz Augusto von Dentz
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