Code to allow OTA of an nRF52 via UART

Looking for some working code to integrate into a project that will allow an nRF52 to upgrade via UART. The UART is connected to a cell chip for which we already have code. The new firmware will be downloaded from a website that we can give you access to for testing. UART should be disconnected and put to sleep when not in use to save battery life. All aspects of code should ensure power efficiency is paramount.

Currently using an nRF52840 DK board with a Botletics SIM7000 shield for cellular connectivity.