I am having good results testing using an ATtiny85 as a sleep supervisor as it idles at less than 1uA waiting for a hardware interrupt. I have little programming experience however and have trouble making SoftwareSerial library work with the sleep library, anybody try this?
I would like detect an event and then drive a high-side switch using the ATtiny upon wake-up from deep sleep, write the packet counter to a totally powered down (ABP) LoRaWAN node. A serial message would be ideal but I guess I could tap it out in morse! A simple digital indication from the LoRaWAN node after transmit could sleep the node again.