Apple

Hi William, you should be able to get much better than 3kb/s. I just did a test sending from my iphone5 running 6.1.4 as the peripheral to my mini running 6.1.3 as the central. ~20kbps. �Look at �http://developer.apple.com/library/ios/#samplecode/BTLE_Transfer/Introduction/Intro.html and how they use subscriptions, ie updateValue on a characteristic. That should help.

Etan, this is http://www.scriptreactor.com/conn_interval-throughput.pdf is very interesting.�

On Mon, May 13, 2013 at 4:46 PM, William Henderson <email@hidden> wrote:

Piddled with this some more and got it much faster � around 2.5kbs.�

The trick was in using�CBCharacteristicPropertyWriteWithoutResponse when setting up my service on the peripheral � just writing with�CBCharacteristicWriteWithoutResponse (on the central) didn't do it.

--�
William Henderson
Sent from my iPhone
On Monday, May 13, 2013 at 3:16 PM, William Henderson wrote:
Got it. Anyone managed to do better than with an iOS as peripheral? Hoping to eke out 3kb/s or so...

--�
William Henderson
Sent from my iPhone

On Sunday, May 12, 2013 at 1:12 AM, Etan Kissling wrote:

William,

I have used a dedicated peripheral where the connection interval can be chosen more fine-grained.

With an iDevice taking the peripheral role, such speeds cannot yet be achieved with public APIs as of iOS 6.1.4.

Etan

On 12.05.2013, at 07:26, "William Henderson" <email@hidden> wrote:

For reference, what I'm seeing is that no mater how fast I send packets (from the central), the peripheral only receives a packet every 60ms. With a 20b packet that's about .33kb/s.

This is with�CBPeripheralManagerConnectionLatencyLow.

--�

William Henderson

Sent from my iPhone

On Saturday, May 11, 2013 at 10:00 PM, William Henderson wrote:

Etan,

Which direction were you sending in? I'm not seeing anything near that rate when going from central->peripheral (using writewithoutresponse, scanning off, advertising off)...

William

�

Frederic, there is only one packet of up to ~20 bytes transmitted every two connection events if you use reliable data transfer. If you want to increase that to ~ four packets every connection event, you have to use unreliable data transfer (WriteWithoutResponse / Notification) and have to add reliability in your app layer. Note that WiFi interferes with BLE, disabling it should net you a small boost in throughput. These are the throughputs I could achieve with iPhone as central and dedicated peripheral: http://www.scriptreactor.com/conn_interval-throughput.pdf Etan

�

I have made some tests to exchange data between 2 iDevices (iOS6 iPad3/iPhone5) using CBPeripheralManagerConnectionLatencyLow settings.

The maximum rate I have is 1135 bytes / s (1.1KB/s)

- Is it possible to get better speed ?�

- What is the maximum I can have with iOS stack ?

From some documents:

BLE: 200kbits/s -> 25KB/s

NFC: 424kbits/s

Why is the difference so huge (20x slower) ?

Fred

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Regards,
Matthew

References:
	>Re: data transmission rate...to slow... (From: Etan Kissling <email@hidden>)
	>Re: data transmission rate...to slow... (From: William Henderson <email@hidden>)
	>Re: data transmission rate...to slow... (From: William Henderson <email@hidden>)
	>Re: data transmission rate...to slow... (From: Matthew Chung <email@hidden>)