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Simple WiFi relay board (2): A 4 channel DIY WiFi relay board with ESP8266-01 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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Installing Sonoff firmware on ESP8266 microprocessor, then use MQTT to send to bubble? - APIs - Bubble Forum
GitHub - danimtb/sonoff-danimtb: Alternative firmware for Itead Sonoff ( ESP8266/ESP8285 based) devices to use them in Home Assistant
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