Accessing information transmitted by Ble tag.

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As part of my summer placement, I've been introduced to some
non-connectable Ble tags. These are effectively beacons - advertising
and transmitting data every 250ms.

Now, this is where I'm less clear:
I am something of a bluetooth newbie as it were, but I know for sure
they're transmitting more than just the address and name of the device
(as displayed in hcidump when running hcitool lescan). I know this
because the data is picked up on an iPhone app I have lying around.

My question is, how would I read data from a connectionless Ble broadcaster?

I was originally looking for some kind of observer-broadcaster api and
in fact found patches on this list regarding it, and even an orphaned
branch at http://gitorious.org/~jdelfes/bluez/jdelfes-bluez/commits/bo-new,
but those APIs don't seem to have made it into the official
repository.

Do you know which part of the API I should start looking, or in which
one of the provided tools?

Sorry for any kind of trouble I may be causing.
Many thanks,

James
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