DFU over cellular internet

[Tim Adu]

Hi,

This is actually a followup ticket based on this: https://devzone.nordicsemi.com/f/nordic-q-a/56228/fota-dfu-over-internet.

Now the situation is a bit more concrete (or at least how I imagine the situation):

1. I am using a cellular modem. This will be used to download a dfu package from a third party endpoint using AT commands.
2. The dfu package will be copied to mcu (nrf52840) via UART, also using AT commands
3. The mcu is rebooted and enters DFU mode (using the power management API). The bootloader activates the DFU image

Questions

1. Is the above scenario even possible? What am I missing?
2. Would the secure BLE bootloader be able to activate an image downloaded in this manner?
3. Given the potential size of the dfu image - should the UART buffer be a large as possible?

Thanks 

Tim

[Edvin]

NB: We are really short staffed due to Summer Holidays in Norway. You must expect some extra delay in technical questions these days, I am afraid. I am sorry for the inconvenience.

I will get back to you as soon as I can, hopefully tomorrow.