Re: BLE& iOS6: Max distance supported
Re: BLE& iOS6: Max distance supported
- Subject: Re: BLE& iOS6: Max distance supported
- From: Joakim Linde <email@hidden>
- Date: Sun, 24 Jun 2012 20:03:30 -0700
On Jun 24, 2012, at 5:01 PM, Andy Fuchs <email@hidden> wrote:
> Am 25.06.2012 um 00:32 schrieb Frederic Visticot:
>
>> I have take a look on the following WWDC video https://developer.apple.com/videos/wwdc/2012/
>>
>> Presentation and demo is really nice !! Great presentation Joakim !!
>>
>
> True - that was awesome (even live :-))
Thanks!
>
>> Several questions:
>> - What is the maximum distance between the 2 smartphones (is is 30m ?)
>> - Can we adjust this distance ? (between 1 and 30m) ?
>
> I doubt that, but info on that would be much appreciated.
In the demo, one device is just sending out advertising packets as peripheral. The other device is scanning for advertising packets from peripherals. Once it sees an advertising packet with an RSSI (Received Signal Strength Indication) higher than -30 dB, it connects to the device and gets the info (vCard). You can pick any RSSI trigger level you want for your application. Core Bluetooth simply gives you the advertising packet and at what RSSI it was received. It's then up to the app to decide if its close enough to connect.
Once connected, they can stay connected for up to about 50ft (very much dependent on the environment however). Advertising packets can usually be detected further away. Give it a try and see if it works for your app.
>
>> - Where can I download the code from the VCardService (not available in the WWDC source code package)
>
> I just got some info from Stephen Chick, that the demos will be provided 'soon'. The demo is very interesting because of it's implementation. I'm curious how they handled the Client and Server part (switching roles?, or 2 apps with different roles compiled?)
The app has different roles, but you can easily build an app that supports both roles. The two devices are then going to try to connect to each other and one will win.
>
>> - What are the iPhone models used for the demo with blinking leds :)
>
> iPhone4s, hopefully ;)
Bluetooth Low Energy and the Core Bluetooth framework was introduced in mid 2011and supported on all Macs, iPhone and iPad since then.
>
> andy
>
>
>>
>> -Fred
>>
>>
>>
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