A deep dive into the Sonoff S31 and S31 Lite. Looking at the differences between the Wifi and Zigbee version of this smart outlet. The S31 version uses an ESP8266EX which can be reflashed with ESPHome for full control.

Schematic and docs: https://github.com/techdregs/Sonoff-S...

=== Timestamps ===
00:00 Introduction
01:30 Disassembly
02:00 Wifi Version Overview
04:10 Zigbee Version Comparison
06:30 Circuit Description
13:53 Flashing ESPHome
24:40 Conclusion