NRF 52 DK ble dfu VS Android NRF Connect DFU speed diifference

[ip278116]

Hello Nordic Devzone fellowes

I tried DFU with NRF 52 DK board with 'PC-BLE-DRIVER-JS' dfu.js test code

When the firmware .zip file is 128 KB the speed of transftering the file is 600 Bytes / sec

However When I try with NRF connect App on my Android phone (Sony Xperia XZ premium)

it has 1.6 KB / sec Which is way faster than when I tried with NTF52 DK board.

If anyone know why there are difference please let me know

and is this something I can improve by modifying Source code of 'pc-ble-driver-js'??

Thank You.

[Hung Bui]

Hi, 

 

Have you checked the connection interval ? 

If you have a BLE sniffer, can you check how many packets being sent in one connection interval ? 

Have you tried to use the nRFConnect application on PC to do DFU ?

Would the reason is the same as discussed in this case (only one write command at a time) 

 

[ip278116]

I am not sure how to use BLE sniffer application, seems like its not an executable file.

However When I try NRF connect on PC for DFU, it transfer the same file with 1.6 KB/sec speed.

I am pretty sure NRF connect is using same javascript code from 'pc-ble-driver-js' dfu.js code for DFU.

Why when I try DFU with 'pc-ble-driver-js', it transfer a same file much slower (600 bytes/sec) ?

[ip278116]

I installed the pyserial 3.4 version. Is it okay? now I can see the nrf sniffer menu in the wireshark interface toolbar. but when i click(check) it does not show any interfaces in the front page

[Hung Bui]

Hi, 

I'm sorry indeed for the late response. I was on vacation. Do you still have problem getting the sniffer working ? We do have issue with the sniffer on some computers. You may want to try sniffer v1.0. 

If you don't have the sniffer, you still can find the connection interval by looking for the connection parameter when you receive the BLE_GAP_EVT_CONNECTED event (either on the central or the peripheral). 

 

We will try to have a look at the dfu.js and get back to you as soon as possible. 

[ip278116]

Hello I could not use NRF sniffer with my nrf 51 dongle on windows 10. However, I modify "adapter.js", and it makes the DFU faster (It took 4 min and now it only take 2 min). In "open()" function in "adapter.js", I changed "ResponseTimeout" in options object to 1000 from 1500. If anyone has same issue with me in "pc-ble-driver-js" DFU, Please try my solution. I am not sure of the stability though.

[Bjørn Inge]

Hi,

I would be interested in finding out more about why the ResponseTimeout has such an effect on the transfer time. Would it be possible for you to share the log file of nRF Connect (or pc-ble-driver-js, with debug log level) after a DFU?

[ip278116]

Hello. Log file is too big to post in here. You can just try it yourself. The code is in github.com/.../pc-ble-driver-js The 'responsTimeout' option is in the 'pc-ble-driver-js/api/adapter.js' so please change it to 1000 from 1500. I am not really sure why it become faster. Maybe the frequency of data transferring become faster when i change response time to 1 sec from 1.5 sec.