Sonoff switch complete hack without firmware upgrade, by Ipsum Domus

Sonoff NSPanel by ITead - Smart Scene Wall Switch based on ESP32

No Tasmota and eWeLink cloud to control the SONOFF device? YES

Configure WiFi without eWelink · Issue #22 · roleoroleo/sonoff

Sonoff NSPanel by ITead - Smart Scene Wall Switch based on ESP32

Sonoff Mini doesn't go into DIY mode with 3.5.0 update · Issue #75

Sonoff integration without changing firmware - Configuration

Sonoff Mini doesn't go into DIY mode with 3.5.0 update · Issue #75

21: Six Sonoff Secrets – SuperHouse Automation

21 How to Hack Sonoff Basic to Control 8 Devices

Broadlink smart home devices complete protocol hack