Apple

---------- Forwarded message ----------
From: steven lin <email@hidden>
Date: 2015-04-02 20:08 GMT+08:00
Subject: Re: send data rate more than 32Kbps on ble issue
To: Martijn The <email@hidden>

hi ,
thank for your reply.

>13 KBytes/s in my experimentation

about this item, that mean iphone should be 13KBps(about 104 Kbit per second,104 bps). i only 16 k bits per second now .

>flow control for CBCharacteristicWriteWithoutResponse

i don't miss any packets,but that send one packet every 10ms.

So,that is too slow on my request and i check it send every 1ms one packet in the phone.

Can you give me a common for these?

2015-04-02 11:37 GMT+08:00 Martijn The <email@hidden>:

> 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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