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.

When pulse mode is enabled the relay will automatically switch back to its normal state after the pulse time (below).

Pulse time in seconds.

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 port for the web interface and API requests.
If different than 80 (standard HTTP port) you will have to add it explicitly to your requests: http://myip:myport/

This is the key you will have to pass with every HTTP request to the API, either to get or write values.
All API calls must contain the apikey parameter with the value above.
To know what APIs are enabled do a call to /apis.

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>/button/# For each button in the board subscribe to this topic to know when it is pressed (payload 1) or released (payload 0).
- <root>/ip The device will report to this topic its IP.
- <root>/version The device will report to this topic its firmware version on boot.
- <root>/status The device will report a 1 to this topic every few minutes. Upon MQTT disconnecting this will be set to 0.

In Watts (W). 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.

In Volts (V). Enter your the nominal AC voltage for your household or facility, or use multimeter to get this value.

In Ampers (A). If you are using a pure resistive load like a bulb this will the ratio between the two previous values, i.e. power / voltage. You can also use a current clamp around one fo the power wires to get this value.

Move this switch to ON and press "Update" to revert to factory values.