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As far as I found documented- there are GPIOS 0, 12, 13, 14 on a basic Sonoff.
Does anyone know if Tx/Rx are free to use after uploading my code, as GPIO’s ?
I had used Sonoff for some time. Yes RX and TX pins are used while programming ESP8266 inside the Sonoff. But After the flashing/programming, you are completely free to use those pins.
Required, but never shown