Apple

Are you using iOS 5 or iOS 6?

On iOS 5, calling writeValue will cause a write failure after about 30 writes (of 20 bytes each) unless you add a delay and allow the device to catch up and deliver the packets to the device.

On iOS 6, the internal iOS buffer seems a lot bigger. It appears you can queue up about 200 writes before getting a write failure.

On Sat, Nov 24, 2012 at 10:06 AM, Christian Giordano <email@hidden> wrote:

Took 17.3 seconds to send 28757 bytes. this can be speed up reducing the latency though.

On Sat, Nov 24, 2012 at 5:51 PM, Christian Giordano <email@hidden> wrote:

Tested the other way round (sent 29KB from Peripheral to Central) and I had no problems.

Thanks, chr

On Sat, Nov 24, 2012 at 3:52 PM, Christian Giordano <email@hidden> wrote:

Sorry, I forgot to mention that so far I have been using 2 ios devices (iphone4s and ipad3), maybe with a proper BTLE module I would have less issues?

Cheers, chr

On Sat, Nov 24, 2012 at 3:50 PM, Christian Giordano <email@hidden> wrote:
Hi guys, I manage to successfully pass data from the Central to the Peripheral and thanks to Khaos I have some ideas how the speed could be improved.

I was testing the solution passing 200 bytes spread across 10 [peripheral writeValue:chunk forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];

The communication was pretty solid and the speed acceptable (sometimes was taking just a couple of seconds)

Then I tried to increase the number of bytes passed to the order of tens of thousands and some problems appeared. Looks like the connection with the peripheral breaks after a bit. The maximum I managed to send "in one go" was 2KB. But most of the case it breaks after few hundreds.

I understand that what I am trying to do is not a canonical use case for the technology. But I wonder if it would still be possible to have a prolonged stable communication where the Central send a fair amount of data to the Peripheral or if I really do have to find a way to invert the roles.

Thanks for any opinion, chr

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References:
	>Re: [BTLE] Sending (a lot of) data to a Peripheral (From: Mark Palatucci <email@hidden>)