Re: unique bus name

Hi,

On Jan 31, 2008, at 0:20, Russell A. Bell wrote:
> 	Quoth the 'AudioDevices' wiki:
>
> 	'The ":X.Y" in the following examples is the unique bus name
> of the audio service. You get it in the reply to the ActivateService
> method call:
> 	$dbus-send --system --print-reply --dest=org.bluez /org/bluez  
> org.bluez.Manager.ActivateService string:audio'
>
> 	When I make this call I get three numbers back, for example:
>
> 	method return sender=:1.0 -> dest=:1.1
> 	   string ":1.2"
>
> which is the 'unique bus name of the audio service'?  I think 1.0 is
> the source (i.e., the bluetooth transceiver); the destination would
> seem to be :1.1; what is :1.2 ?

:1.0 is the sender of the method return to the ActivateService method  
call, i.e. hcid. :1.1 is the destination of the method method return,  
i.e. dbus-send. :1.2 is the value returned as the single parameter of  
the method return, i.e. the unique name of the audio service.

>
> 	When I try to use either of them to CreateHeadset I get:
>
> 	Error org.freedesktop.DBus.Error.ServiceUnknown: The name :1.x was  
> not provided by any .service files
>
> for 1.1 or 1.2

That's because :1.1, i.e. the first dbus-send process, doesn't exist  
any more. And because :1.2, which for a short moment was the audio  
service, failed to initialize for some reason and exited.

> 	/var/log/debug contains:
>
> Jan 30 13:14:29 randytool hcid[8110]: Child PID 8115 got the unique  
> bus name :1.2
> Jan 30 13:14:29 randytool hcid[8110]: name_listener_add(:1.2)
> Jan 30 13:14:29 randytool hcid[8110]: /org/bluez:  
> org.bluez.Database.AddServiceRecord()
> Jan 30 13:14:29 randytool hcid[8110]: Service owner exited: :1.2
> Jan 30 13:14:29 randytool hcid[8110]: Audio service (audio) exited  
> with status 1
>
>
> 	Does this indicate that the service record was created then
> deleted immediately?

It seems the audio service is failing to start for some reason. Could  
you try running it manually as root with "/usr/lib/bluetooth/ 
bluetoothd-service-audio -s" as see what messages you get? You'll need  
to rename or remove the /etc/bluetooth/audio.service file before that  
so hcid doesn't complain about duplicate services.

Johan

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