@matthijs @epyon
Might be something SPI related which works differently on the STM32.
I assume that I may have all RFM95 SPI and IO pins floating and RFM95 NSS/RESET high while sleeping?
Have NSS/RESET lines on the RFM95 internal pullup? May I also leave them floating?
The point is that I only added the RFM95 to a working setup which used 2μA in sleep mode. :-/
I will experiment some more…