Transfer speed secure DFU SDK14

[janR]

Hi,

I wonder what transfer speed can be expected on a BLE DFU update on a nRF52832 based device in the following condition?

-SDK14.0 Secure DFU, nRF52832, Android tablet (Oreo, Bluetooth 5.0), nRF Connect

We are currently facing a transfer speed of about 1 Kbytes/sec, which sounds way too low. On a 350 Kbytes file, it will take almost 6 minutes to transfer.

Regards, Jan

[shibshab]

What you see is as expected. As far as I know, the bottleneck is the process of storing the received data to flash on the DFU target side.

[janR]

Hi, If I use nRF Connect (v2.2.1) - Bluetooth Low Energy for Windows, and evaluation kit PCA10040, I see a speed of about 4Kbytes/sec), 4 times the speed of the Android tablet. Why is there a difference?

Regards, Jan