Firmware update (DFU) from server or cloud.

[vishal]

Hello to all,

We are using nRF52840 with SDK v15.0 using SES, Our application is we have sensor devices with interface WiFi module. Sensor device will wake up as predefined time interval and send data to cloud using WiFi connectivity. 

Now we want to update this sensor devices firmware from server. Currently we are able to update firmware using secure_ble via android app. But our requirements and few questions as below:

1. How I can download program zip file from server using WiFi and store it in flash memory? (We know how to store data array into flash using FDS but not understand how to store and read this zip file in nordic internal flash)
2. What is best way to do as per following flow:

get zip file from sever --> store in flash --> switch application to DFU / boot-loader mode using button less --> read this file from flash --->send this file for upgrade firmware and replace with existing firmware.

For implement as per above will you please provide me sample example code and some tutorial for how to do that?

Looking forward your response..!!!

Thanks in Advanced..!!

[Vidar Berg]

Hello,

Suggests that you take a look at this thread: https://devzone.nordicsemi.com/f/nordic-q-a/46994/background-dfu-application-source-code. Sounds like you have similar requirements. 

[vishal]

Hi Vidar,

Thanks for providing this very useful thread link. I have read this thread and also download source code as attached there.

But I am not understand How i can start to implement this?  For your information the below our current existing working application in brief:

We have used external WiFi module and interfaced with nRF52840 via UART. This WiFi module is communicate with nordic controller via AT command for sending our data to server as predefined interval set.  

Now my question is How i can download or get program zip file from server with chunks via uart_event_handler in nRF52840 buffer. For that can you provide me sample program snippet to know better understanding.

Thanks for supporting....!!!!

[vishal]

Ok, I have run the program_bl_sd_bl_settings_52840.bat but got exceptions which is 

unknown bootloader setting version

And my another point is why in my program getting bootloader start address is not set.

Thanks..

[vishal]

Hi Vidar,

After understanding all command and background DFU over UART serial your provided example is worked for me. Understood bootloader setting version and generated setting hex file.

I am able to view Logs for understanding working flow of program.

Now my next step is implement custom transport layer for WiFi with my application.

Thanks...!!!

[Vidar Berg]

Hi,

Thanks for the update, glad to hear that you got it to work! This will hopefully make it easier to implement and verify your Wifi transport. Good luck. 

[vishal]

Hi Vidar,

I have one question:

Our existing application is working with update FW from mobile application over ble which is fine no any problem. 

So Is this possible to update FW over ble(existing) and from cloud that I am currently implementing.

We want to update Softdevice+Bootloader+app using mobile app and also auto application update from server if available.

Thanks....!!!

[Vidar Berg]

Hi,

Yes, you can keep the existing BLE transport in the bootloader and still support background DFU in your app. 

[vishal]

Thanks for the update..

We will Implement both transport layer, But currently we getting lots of difficulties for creating our own transport layer for Wi-Fi. I am strange for writing own transport layer for WiFi nothing any available reference source.