Re: BLE& iOS6: Max distance supported
Re: BLE& iOS6: Max distance supported
- Subject: Re: BLE& iOS6: Max distance supported
- From: Louis Mamakos <email@hidden>
- Date: Sun, 24 Jun 2012 23:59:07 -0400
On Jun 24, 2012, at 11:03 PM, Joakim Linde wrote:
>
> 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.
I watched the WWDC video, and I was surprised that the application used Notifications vs. Indications to transfer the chunks of the vCard between the peripheral and central devices. I would have expected that using Indications might provide some flow-control as well as more reliable transport between the two device. Or perhaps I was taking the narrative too literally?
Louis Mamakos
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