DFU in the application

[Waqas Qammar]

Hello All,

I want the DFU service at the application level, not at the bootloader level. Means I have to build a very simple bootloader but I want DFU service at the application level. I want to do DFU at the application and when the process is completed the bootloader only starts the new application. If at the bootloader level the DFU service can exist then it can exist at the application level. I don't know how to start with it. Can anyone help me with that, please? I am using sdk12.3 to remain compatible with NRF52 and NRF51.

[Einar Thorsrud]

Hi,

What you describe is essentially what is called Background DFU in Nordic SDK context. We do not provide any such implementation for normal BLE applications, and no implementation at all for SDK 12.3. You can refer to the IoT background DFU implementation from a later SDK for reference, though.

[Waqas Qammar]

Hello,

I've gone through the page but it seems it is not ble based but ftp transfer. If Nordic don't provide it, I want to know can we modify the existing secure_bootloader_dfu code to the requirement that we are looking for? I mean can I modify the example implementation in any way that it can run at the application level. or it is impossible for the sdk 12.3? 

[Einar Thorsrud]

Hi,

Nordic does not provide any normal BLE based background DFU implementation. It should definitely be possible to modify the existing bootloader to do background DFU, but so you have to implement it yourself. I suggest you look at the IoT implementation that I linked to together with the "normal" DFU implementation from the SDK to get inspiration.

[Waqas Qammar]

Well, Thank you for that. Last I just want to ask I was trying to implement BLE Based Background DFU, So the linked IOT Implementation still provide inspiration or help because it is not ble based