FOTA update without external flash for Atmega32U4 + RFM69

I’ve blogged before why¬†firmware-over-the-air (FOTA) updates are a must-have nowadays, however my old AVR+RFM based projects were incapable of that due to the lack of external flash to temporary store the new firmware before it is flashed on chip. The Moteino project does have FOTA capabilities and Felix has created an excellent library¬†for this, sure…