This name will identify this device in your network (http://<hostname>.local). For this setting to take effect you should restart the wifi interface clicking the "Reconnect" button.

Here you can define what will be the status of the relay after a reboot.

The administrator password is used to access this web interface (user 'admin'), but also to connect to the device when in AP mode or to flash a new firmware over-the-air (OTA).
It should have at least eight characters (letters, numbers or the underscore) and at least one number, one lowercase and one uppercase letter.

This is the key you will have to pass with every HTTP request to the API, either to get or write values.

This is the root topic for this device. The {identifier} placeholder will be replaces by the device hostname.
- <root>/relay/# Send a 0 or a 1 as a payload to this topic to switch it on or off. You can also send a 2 to toggle its current state. Replace # with the relay ID (starting from 0). If the board has only one relay it will be 0.
- <root>/led/# Send a 0 or a 1 as a payload to this topic to set the onboard LED to the given state, send a 3 to turn it back to WIFI indicator. Replace # with the LED ID (starting from 0). If the board has only one LED it will be 0.
- <root>/ip The device will report to this topic its IP.
- <root>/heartbeat The device will report to this topic every few minutes.
- <root>/version The device will report to this topic its firmware version on boot.

If you are using a pure resistive load like a bulb this will be writen on it, otherwise use a socket multimeter to get this value.