siehe zu der Firmware 1.0.21

` > Version 1.0.21 and down:

a short press toggles the relay either by sending a MQTT message like cmnd/sonoff/light 2 or directly. This will blink the LED twice and sends a MQTT status message like stat/sonoff/LIGHT on

two short presses toggles the relay. This will blink the LED twice and sends a MQTT status message like stat/sonoff/POWER on

three short presses start Wifi smartconfig which allows for SSID and Password configuration using an Android mobile phone with the ESP8266 SmartConfig app. The green LED will blink during the smartconfig period for 1 minute. The MQTT server still needs to be configured in the user_config.h file

four short presses start OTA download of firmware. The green LED is lit during the update

five short presses will restart sonoff

pressing the button for over four seconds resets settings to defaults as defined in user_config.h and restarts the device `

genau den Abschnitt:

The MQTT server still needs to be configured in the user_config.h file

heißt wohl vereinfacht:

Der MQTT-Server muss weiterhin in der Datei user_config.h konfiguriert werden.