This is a simple program to measure minimal power consumption on a STM32WLE5JC based board. Everything is disabled but the RTC peripheral which is used to wake up the MCU. The program blinks a few times and then goes 10 seconds into Stop2 mode which is the lowest "reasonable" power mode.
I have measured the Seeed Lora-E5-Mini at 90uA and the STM32WL MAMWLE-C1 at 9uA, which is a very nice result.