nRF52840 USB Dongle programmer to perform OTA DFU

[Kaveh.M]

Hi, 

I have a nRF52840 USB Dongle that I am using to perform OTA DFU to use to perform OTA DFU.

After the update is finished, the device keeps running the code instruction with no problem. 

Now if I want to upload a new firmware over the air, the device does not advertise anymore as a DFUTarg so that I can flash it again. 

What do I need to do or what should I add to my code to be able to perform a new OTA DFU?

Thanks

[Vidar Berg]

Hi,

You need to add the 'Buttonless Secure DFU Service' to your main application like how we have done it in our Buttonless DFU Template Application . This service provides the neccessary interface for the DFU controller to make the target device enter bootloader DFU mode.

Best regards,

Vidar

[Kaveh.M]

Thank you. The "Buttonless DFU Template Application" is tough to understand. 

Lets say If I want my LED1 toggles for 5 min, and after that my BLE device advertise as "Nordic_Buttonless" for 30sec in DFU mode, then upon receiving a new firmware perform that, otherwise perform the previous firmware which was LED blink. Which parts of your template I should add my code and settings? 

[Vidar Berg]

Sorry for the delayed response. Have you had any progress on this in the meantime? As explained in the Buttonless Secure DFU Service' section of the SDK documentation, the buttonless DFU service is only providing a mechanism to make the device jump from the main application to bootloader DFU mode after receiving the proprietary DFU start command from the DFU client (the DFU enter method is illustrated by the message sequence charts).