From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <2be43af8bc6609589374bd4a7c625a7a@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Thu, 24 Sep 2009 09:22:17 +0100
In-Reply-To: <3e4833291ef0dcb43052d394aa5231e1@9netics.com>
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Subject: Re: [9fans] bluetooth
Topicbox-Message-UUID: 76e476e6-ead5-11e9-9d60-3106f5b1d025

>> 	cat /n/bt/devices
>> (see what devices have been found)

Typo - should be /net/bt/devices - currently gives you device address,
class, and friendly name for all "known" devices (see below).  First
on list is self.

term% cat /net/bt/devices
00025b0011bf 020104 'atom'
00236c9dd69f 38010c 'Richard Miller’s MacBook'

> the application i have in mind inventories all device id's it sees
> with a time stamp.

What do you mean exactly by "sees"?  A device may be known
because it responded to an inquiry (probe for all devices) or a
page (probe for specific device), or because it sent you an inquiry
or a page, or because you paired with the device at some time in
the past and have a stored link key for it.  [A device may be set
to respond to page but not inquiry.  Or vice versa.]

> while (sleep 1) {
> 	echo `{ls /net/bt/ids}^'@'^`{date -n}
> }

The hardware can automatically do periodic inquiry scans in the
background.  I could add a command 'inquiry auto N' to enable this
(but I guess you would still need a 'sleep' loop to look at the
devices file).

Advice sought:
1. Would it be helpful to have a timestamp in the devices record to
give the time the device was last seen (for some value of "seen")?
2. When should a device disappear from the /net/bt/devices list?