Re: [Bluez-devel] DBus interface - determining whether a device exists

[Johan Hedberg <johan.hedberg@nokia.com>]

Hi Matthew,

On Thu, Aug 17, 2006, Matthew Garrett wrote:
> The problem isn't just in actually setting up the connections, it's in 
> providing the information about available devices to other applications. 
> Nowadays, the right layer for device enumeration is HAL. If I tell my 
> system about a mobile phone, then the correct behaviour is for it to 
> appear as a HAL object. In order for Network Manager to offer me the 
> choice of connecting via my phone, the phone needs to be in HAL. So, 
> somehow, at login time the phone needs to be added.
> 
> There's two ways of dealing with this. The one that I prefer is that we 
> make some effort to determine that the phone actually exists, and then 
> add it to HAL in the same way that we would if we'd just done device 
> discovery and the phone was discoverable. This needs us to have some 
> mechanism for determining whether the phone actually exists. The second 
> is that we store the HAL data and repopulate HAL at login time. This is 
> more hacky, since we're adding information without even having made a 
> token effort to determine whether the device exists or not.
> 
> I guess that since we don't have any guarantees that the device exists 
> at any given point in time anyway, this makes less difference and we 
> should just populate HAL regardless. I suppose I'm open to that.

Maybe you could simply use the list of bonded devices to populate HAL?
You could use the ListBondings method and BondingCreated/BondingRemoved 
signals for that.

Johan

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