Re: Bluetooth 4.0 LE - RSSI without connection

Subject: Re: Bluetooth 4.0 LE - RSSI without connection
From: Flavio Crisciani <email@hidden>
Date: Fri, 08 Mar 2013 12:23:00 -0800

Hi Jason,

thank you for the very fast response.

The use case scenario is something related to proximity discovery with multiple centrals. So you have like one peripheral device that broadcasts its advertisments and some centrals that leveraging on the RSSI estimate how far they are from the peripheral.

In this scenario using a connection approach does not scale, because with the growth of centrals number they will start competing for the peripheral and will lose precision.

Considering that the RSSI can be calculated when every advertisment packet arrives on the central side, it is possible to let the CoreBluetooth framework to keep it updated in the CBPeripheral data structure?

What do you suggest as next step? File a bug report with this description?

Best,

Flavio

On Fri, Mar 8, 2013 at 11:57 AM, Jason Conn <email@hidden> wrote:

Flavio,

As you correctly noted, since duplicate filtering cannot be disabled while scanning in the background, connectionless RSSI monitoring is not possible.

If there is something you're trying to do that isn't possible with the current incarnation of CoreBluetooth, let us know. Feel free to file a bug report detailing exactly what it is you're trying to accomplish and what you would need to do so.

- Jason

On Mar 8, 2013, at 11:51 AM, Flavio Crisciani <email@hidden> wrote:

Hi,
is there a way to be updated on the value of the RSSI of a device withouth establishing a connection?

I'm searching for a way that works also in background, so from what I see the option that "allow duplicates keys" (CBCentralManagerScanOptionAllowDuplicatesKey) is ignored when the app goes in background.

Any idea?

Thank you very much.

Flavio
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References:
	>Bluetooth 4.0 LE - RSSI without connection (From: Flavio Crisciani <email@hidden>)
	>Re: Bluetooth 4.0 LE - RSSI without connection (From: Jason Conn <email@hidden>)

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