[Bluez-devel] dbus api

[Bluez-devel] dbus api

[Alexander]

Hello list,

I'm working on a C++ library that invokes bluez over dbus. I'm currently 
having some trouble understanding the logic of a local service. Could 
someone explain me the way local services are managed? Like, calling 
RegisterService() of the org.bluez.Database, what does that method do? 
Does it create a new ServiceRecord on hciX? If so, what happens with the 
protocol descriptors of that service record? How can I list all the 
registered services on hciX? I see Add and Update methods for service 
records but no ListServiceRecords()? There is a ListServices() method on 
the manager interface but this interface is just for the /org/bluez 
object path, so this won't give me a list just for hciX. Also, the 
org.bluez.Service interface, does it have anything to do with 
Add/UpdateServiceRecord() methods of the database interface? Can I 
modify the service record (for example the protocol descriptors) of a 
service represented by the org.bluez.Service interface?
What happened with the RFCOMM API? I agree it wasn't very nice by 
forcing you to open /dev/tty* but it was at least something, now there 
isn't anything dbus based. A RFCOMM API with connect(), disconnect(), 
read() and write() will be just great (all dbus based ofcourse, no 
/dev/tty* stuff :) ).

best regards,
Alexander

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Re: [Bluez-devel] dbus api

[Marcel Holtmann]

Hi Alexander,

> I'm working on a C++ library that invokes bluez over dbus. I'm currently 
> having some trouble understanding the logic of a local service. Could 
> someone explain me the way local services are managed? Like, calling 
> RegisterService() of the org.bluez.Database, what does that method do? 
> Does it create a new ServiceRecord on hciX? If so, what happens with the 
> protocol descriptors of that service record? How can I list all the 
> registered services on hciX? I see Add and Update methods for service 
> records but no ListServiceRecords()? There is a ListServices() method on 
> the manager interface but this interface is just for the /org/bluez 
> object path, so this won't give me a list just for hciX. Also, the 
> org.bluez.Service interface, does it have anything to do with 
> Add/UpdateServiceRecord() methods of the database interface? Can I 
> modify the service record (for example the protocol descriptors) of a 
> service represented by the org.bluez.Service interface?

a service and a service record are two different things.

The service is something that is BlueZ based. It normally implements one
or more profile specifications and provides a D-Bus interface to use
them.

The service record are SDP records that are mandated by the profile
specification.

You can use both independently. However both are bound to your D-Bus
connection. If you connection dies (meaning your process disconnects)
the service and also the service records will be automatically removed.

> What happened with the RFCOMM API? I agree it wasn't very nice by 
> forcing you to open /dev/tty* but it was at least something, now there 
> isn't anything dbus based. A RFCOMM API with connect(), disconnect(), 
> read() and write() will be just great (all dbus based ofcourse, no 
> /dev/tty* stuff :) ).

The RFCOMM API has been moved over to a serial service.

If you don't wanna open /dev/rfcomm* then use Bluetooth RFCOMM sockets
directly. D-Bus is not for transferring data.

Regards

Marcel



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Re: [Bluez-devel] dbus api

[Alexander]

Hi Marcel,

where can I read or look for examples of a service? I'm confued, how can 
one make a service available with a name and description?

What about listing the currently added local service records? It looks 
like such a method is missing from the API.

If I want to make a rfcomm-based service available on my PC for others, 
than the right way would be to register a service record with a rfcomm 
protocol descriptor and than I should bind listening for new connections 
on rfcomm, right?

What do you mean the RFCOMM API is moved to a service? How can I access 
it? How can I initiate a new rfcomm connection or listen for an incoming 
one?

best regards,
Alexander


Marcel Holtmann wrote:
> Hi Alexander,
>
>   
>> I'm working on a C++ library that invokes bluez over dbus. I'm currently 
>> having some trouble understanding the logic of a local service. Could 
>> someone explain me the way local services are managed? Like, calling 
>> RegisterService() of the org.bluez.Database, what does that method do? 
>> Does it create a new ServiceRecord on hciX? If so, what happens with the 
>> protocol descriptors of that service record? How can I list all the 
>> registered services on hciX? I see Add and Update methods for service 
>> records but no ListServiceRecords()? There is a ListServices() method on 
>> the manager interface but this interface is just for the /org/bluez 
>> object path, so this won't give me a list just for hciX. Also, the 
>> org.bluez.Service interface, does it have anything to do with 
>> Add/UpdateServiceRecord() methods of the database interface? Can I 
>> modify the service record (for example the protocol descriptors) of a 
>> service represented by the org.bluez.Service interface?
>>     
>
> a service and a service record are two different things.
>
> The service is something that is BlueZ based. It normally implements one
> or more profile specifications and provides a D-Bus interface to use
> them.
>
> The service record are SDP records that are mandated by the profile
> specification.
>
> You can use both independently. However both are bound to your D-Bus
> connection. If you connection dies (meaning your process disconnects)
> the service and also the service records will be automatically removed.
>
>   
>> What happened with the RFCOMM API? I agree it wasn't very nice by 
>> forcing you to open /dev/tty* but it was at least something, now there 
>> isn't anything dbus based. A RFCOMM API with connect(), disconnect(), 
>> read() and write() will be just great (all dbus based ofcourse, no 
>> /dev/tty* stuff :) ).
>>     
>
> The RFCOMM API has been moved over to a serial service.
>
> If you don't wanna open /dev/rfcomm* then use Bluetooth RFCOMM sockets
> directly. D-Bus is not for transferring data.
>
> Regards
>
> Marcel
>
>
>
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> Download DB2 Express C - the FREE version of DB2 express and take
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Re: [Bluez-devel] dbus api

[Marcel Holtmann]

Hi Alexander,

> where can I read or look for examples of a service? I'm confued, how can 
> one make a service available with a name and description?

the bluez-utils source code is full of examples.

> What about listing the currently added local service records? It looks 
> like such a method is missing from the API.

And for what do you wanna use that? It is not useful at all.

> If I want to make a rfcomm-based service available on my PC for others, 
> than the right way would be to register a service record with a rfcomm 
> protocol descriptor and than I should bind listening for new connections 
> on rfcomm, right?

Yes.

> What do you mean the RFCOMM API is moved to a service? How can I access 
> it? How can I initiate a new rfcomm connection or listen for an incoming 
> one?

For servers you wanna use the RFCOMM sockets.

Regards

Marcel



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