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) ?

[Hung Bui]

It's very hard to tell why without information about connection interval, number of packet per interval. A sniffer could really help. Please make sure you follow the documentation to know how to use the sniffer (the video is a little bit obsoleted) . 

You can also find information about connection interval by debugging the DFU master and check which interval is used. 

[ip278116]

Okay Before I use the NRF sniffer I have several questions regarding to NRF sniffer installation. I follow the istruction in nRF_Sniffer_User_Guide_v2.1.pdf, I installed Wireshark 2.4.5, SEGGER jlink 6.16 and Python2.7.14 (python --version works!) and I moved all the required files to extcap folder. However, I could not see the interface toobar in View tab dropdown list. Am I doing something wrong? Also I failed to use NRF connect to scan devices after I downgraded to SEGGER jlink 6.16 too

[David Edwin]

What is the OS version you are using with nRF Sniffer ? You have not mentioned the version of pyserial that you installed ? You should be using jlink 6.16c (not jlink 6.16) as mentioned in the documentation.

[ip278116]

I am using Windows 10 Home 64bit and I didnt have pyserial (which was not mentioned in Document). Should i install it in order to use Sniffer? I installed 6.16c successfully. 

[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.