DFU max speed

[alexisduque]

Hi,
What's the max throughput we can achieve with iOS (4S) during DFU ? What are reliable connection interval, packet size ,...., parameters ?
And during downlink (iOS -> peripheral) ?
Cheers,
Alexis

[philips77]

Hi,
As far as I remember all iPhones have the lowest interval connection 7.5ms, and send up to 4 packets each interval. The packet size is 20b. The speed depends also on the Packet Receipt Notification settings.
Regards,
Aleksander

[alexisduque]

Hi Aleksander,
I think iPhones have lowest interval connection 20 ms, no ?
You can have a look at the Apple iOS Bluetooth Design Guidelines
p. 22.
Am I wrong ?

[philips77]

Hi,
Let me check this on Monday.
BR,
Aleksander

[Kamran-Soomro]

The DFU feature inside nRF Toolbox app will let you know the number of bytes transferred and transfer time after uploading firmware.
Also you can set the Number of Packets to 25 from iPhone Setting -> nRF Toolbox to increase the throughput.
On iPhone6, IOS 8.3, With Number of Packets set to 25, I have tried to transfer a firmware file of size 88344 bytes and it took 35 seconds so throughput is 20 kbps.

The normal connection interval set by IOS is 30ms, packets size is 20 bytes, and number of packets transferred per connection interval are approx. 6.

Please Let me know if you have other questions.

Regards,
Kamran

From: Alexis DUQUE [mailto:notifications@github.com]
Sent: 30. mai 2015 11:01
To: NordicSemiconductor/IOS-nRF-Toolbox
Subject: [IOS-nRF-Toolbox] DFU max speed (#1)

Hi,
What's the max throughput we can achieve with iOS (4S) during DFU ? What are reliable connection interval, packet size ,...., parameters ?
And during downlink (iOS -> peripheral) ?
Cheers,
Alexis

—
Reply to this email directly or view it on GitHubhttps://github.com//issues/1.

[alexisduque]

Thank you Kamran 👍