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Re: send data rate more than 32Kbps on ble issue

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Re: send data rate more than 32Kbps on ble issue

Subject: Re: send data rate more than 32Kbps on ble issue
From: Martijn The <email@hidden>
Date: Wed, 01 Apr 2015 20:37:58 -0700

> data rate more than 32Kbps

Should be accomplishable. I've been hitting rates of 13 KBytes/s in my experimentation.

> So, i think at iphone that have some limit on packet queue.

Yeah, empirically, I've experienced the limit of the outbound queue to be ~20 or so packets. Note that flow control for CBCharacteristicWriteWithoutResponse seems to be missing. So there's no direct way to know you've overflow iOS' queue. You can build it into your protocol (and you probably should because the other end might drop them as well) but it's annoying there's no way to know that iOS / CoreBluetooth is dropping the packets the app just gave it right away.

I've just filed this bug about it:

http://www.openradar.me/radar?id=5845858713075712

Martijn

Pebble: E-Paper Watch for iPhone and Android

http://www.getpebble.com

Tel: +1 (650) 308-9383

On Wed, Apr 1, 2015 at 5:58 PM, steven lin <email@hidden> wrote:

hi all,
i need to send file to my peripheral and need data rate more than 32Kbps for it.
but , i can't do that .
Anyone have suggestion about to it.

First,
i have know that data type should be set "WriteWithOutResp."
and build gatt service on peripheral; so,iphone as the central.
then in peripheral setting the connect interval 20ms(min :10ms ; max :20ms)
when start send packet, every 10ms send one packet from iphone .
so, that only 16Kbps on it .
every connect interval has two packet to send.
how to Increase packet number between connect interval.?

Second ,
i rebuild the system for measure that, and change the devices role.
(iphone as gatts(peripheral) ; devices on gattc(central)).
Set "Notify" on characteristic at gatts ,to send other data type .
But, that can't do it also.

So, i think at iphone that have some limit on packet queue.

Platform:
iphone 4s
ios 8.2

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	>send data rate more than 32Kbps on ble issue (From: steven lin <email@hidden>)

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