nRF52833 MCUBoot single slot using UART from ESP32

[ant]

Hi,

We have a board with ESP32 and nRF52833, connected via UART.  We want to upgrade the nRF firmware via either BLE or UART.  The nRF image size is large so dual image slots is not possible.

I tried CONFIG_SINGLE_APPLICATION_SLOT and CONFIG_MCUMGR_SMP_BT (single slot, via BLE), but looks like CONFIG_MCUMGR_CMD_IMG_MGMT requires a second slot.

So I want to explore the way to send the image from ESP32 via UART.  But I am confused on where to start.

Is SMP relevant here? Should I implement SMP on ESP32 in order to achieve my goal?

Any pointers are welcome.  And thanks in advance.

[JONATHAN LL]

Hi, We have entered the summer holiday period in Norway so staffing is low, so some delayed response time is expected. 

but looks like CONFIG_MCUMGR_CMD_IMG_MGMT requires a second slot.

Yes this is true.

Adding some links that can be use full:
 Overview on MCUBoot @ Zephyr RTOS – JimmyIoT (jimmywongiot.com) 
Bootloaders and Device Firmware Updates — nRF Connect SDK 2.0.99 documentation (nordicsemi.com) 
devzone.nordicsemi.com/.../device-firmware-update-dfu-with-mcuboot-bootloader

Here is  Blog: (+) Device Firmware Update (DFU) with MCUBoot bootloader - Software - nRF Connect SDK guides - Nordic DevZone (nordicsemi.com) 
And her devzone.nordicsemi.com/.../ncs-dfu

Regards,
Jonathan