RE: Query on feasibility of firmware-upgrade, via a particular flow involving Wifi

Hung Bui — Wed, 16 Jan 2019 15:15:14 GMT

Hi Ajay,

Could you tell more about your wifi-module ? Is it a thin-modem or it has a MCU inside ?

I assume it's just a thin modem with no MCU.

I think what you plan to do is feasible. Mainly, it's about receiving an image via UART, store that to flash then switch to a bootloader. The bootloader take care of swapping the new image with the original application.

In this case most of the work is done with the application, the bootloader only taking care of switching image.

You can even optimize it to no bootloader but using the MBR (if you have softdevice) and use the MBR to swap the image, but it's more advance and has more risk. If you update a bad image, you have no way to roll back or DFU another image. When with the bootloader (that support BLE DFU) you can do an DFU.