[Bluez-devel] bluetooth hardware that is discoverable by default?

[Bluez-devel] bluetooth hardware that is discoverable by default?

[Dave West]

Hi there,

I have very simple requirements for a bluetooth
'beacon' that is discoverable, but nothing else (ie.
it responds to discovery requests, but you don't need
to connect to it or anything).  At the moment I am
using a D-Link USB dongle where the USB powerlines are
soldered to an external power supply.  This supplies
power to the beacon, but it still needs to connect to
a linux/bluez equipped laptop (with USB power
disconnected as it draws its power externally) to
bring up the device and make it discoverable. 
Immediately disconnecting the bluez laptop you then
have a cheap standalone beacon as long as the power
remains.

I'm wondering is there any way to have a beacon like
this where you don't have to connect it to a laptop
after its been powered up to make it discoverable?  My
searches on google and looking at the bluez code make
me think that normally a HCISETSCAN ioctl is sent to
the device with SCAN_INQUIRY|SCAN_PAGE option to make
it discoverable.  My question is are there any dongles
out there that become discoverable immediately when
they are powered without having to send them a HCI
command?  One of you who have written drivers for
these things might know....

Or if there aren't, can anyone suggest another way I
might go about making or designing a cheap self
powered bluetooth beacon that is discoverable on
powerup?  I may want to manufacture these beacons in
some quantity later.

Thanks,
David


	
	
		
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Re: [Bluez-devel] bluetooth hardware that is discoverable by default?

[Peter Wippich]

Hi Dave,

all "standard" USB dongles behave this way. To get an idea why  read the
standard documents ...

However, you can get a BT serial port adapter (more expensive than USB) or
you can modify the firmware of a standard dongle (you need a
development kit from the BT chip manufacturer for $$$$).

Ciao,
	Peter

On Fri, 21 Jan 2005, Dave West wrote:

> Hi there,
>
> I have very simple requirements for a bluetooth
> 'beacon' that is discoverable, but nothing else (ie.
> it responds to discovery requests, but you don't need
> to connect to it or anything).  At the moment I am
> using a D-Link USB dongle where the USB powerlines are
> soldered to an external power supply.  This supplies
> power to the beacon, but it still needs to connect to
> a linux/bluez equipped laptop (with USB power
> disconnected as it draws its power externally) to
> bring up the device and make it discoverable.
> Immediately disconnecting the bluez laptop you then
> have a cheap standalone beacon as long as the power
> remains.
>
> I'm wondering is there any way to have a beacon like
> this where you don't have to connect it to a laptop
> after its been powered up to make it discoverable?  My
> searches on google and looking at the bluez code make
> me think that normally a HCISETSCAN ioctl is sent to
> the device with SCAN_INQUIRY|SCAN_PAGE option to make
> it discoverable.  My question is are there any dongles
> out there that become discoverable immediately when
> they are powered without having to send them a HCI
> command?  One of you who have written drivers for
> these things might know....
>
> Or if there aren't, can anyone suggest another way I
> might go about making or designing a cheap self
> powered bluetooth beacon that is discoverable on
> powerup?  I may want to manufacture these beacons in
> some quantity later.
>
> Thanks,
> David
>
>
>
>
>
> ___________________________________________________________
> ALL-NEW Yahoo! Messenger - all new features - even more fun! http://uk.messenger.yahoo.com
>
>
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> Tool for open source databases. Create drag-&-drop reports. Save time
> by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc.
> Download a FREE copy at http://www.intelliview.com/go/osdn_nl
> _______________________________________________
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> Bluez-devel@lists.sourceforge.net
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|	Peter Wippich 			Voice: +49 30 46776411		|
|	G&W Instruments GmbH		fax:   +49 30 46776419		|
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