This name will identify this device in your network (http://<hostname>.local).
Hostname may contain only the ASCII letters 'a' through 'z' (in a case-insensitive manner), the digits '0' through '9', and the hyphen ('-'). They can neither start or end with an hyphen.
For this setting to take effect you should restart the wifi interface by clicking the "Reconnect" button.

Human-friendly name for your device. Will be reported with the heartbeat.
You can use this to specify the location or some other identification information.

How often the heartbeat messages should be sent (number of seconds).

Enable / disable heartbeat messages.

Save channel & brightness values in settings

When "Save values" is enabled, wait for the delay (ms) before the values are saved

Use the first three channels as RGB channels. This will also enable the color picker in the web UI. Will only work if the device has at least 3 dimmable channels.
Reload the page to update the web interface.

Use RGB color picker if enabled (plus brightness), otherwise use HSV (hue-saturation-value) style

For 2 channels warm white and cold white lights or color lights to use forth dimmable channel as (cold) white light calculated out of the RGB values.
Will only work if the device has at least 4 dimmable channels.
Enabling this will render useless the "Channel 4" slider in the status page.
Reload the page to update the web interface.

Use a dimmable channel as warm white light and another dimmable channel as cold white light.
On devices with two dimmable channels the first use used for warm white light and the second for cold white light.
On color lights the fifth use used for warm white light and the fourth for cold white light.
Will only work if the device has exactly 2 dimmable channels or at least 5 dimmable channels and "white channel" above is also ON.
Enabling this will render useless the "Channel 5" slider in the status page.
Reload the page to update the web interface.

Use gamma correction for RGB channels.
Will only work if "use colorpicker" above is also ON.

If enabled, channel changes will be smoothed.

Time to transition from one color to another (ms)

(ms, depends on the transition time)

Sync color between different lights.

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 must be 8..63 characters (numbers and letters and any of these special characters: _,.;:~!?@#$%^&*<>\|(){}[]) and have at least one lowercase and one uppercase or one number.

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/

When specified, ESPurna will use these values in place of the hostname (see GENERAL panel) as SSID and device password (see ADMIN panel) as passphrase.

ESPurna will scan for visible WiFi SSIDs and try to connect to networks defined below in order of signal strength, even if multiple AP share the same SSID. When disabled, ESPurna will try to connect to the networks in the same order they are listed below. Disable this option if you are connecting to a single access point (or router) or to a hidden SSID.

When scanning is enabled, also periodically scan available networks when currently connected network RSSI is below this value.

You can use the following placeholders: {hostname}, {mac}

If left empty the firmware will generate a client ID based on the serial number of the chip. You can use the following placeholders: {hostname}, {mac}

This is the root topic for this device. The {hostname} and {mac} placeholders will be replaced by the device hostname and MAC address.
- <root>/relay/#/set 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 switch ID (starting from 0). If the board has only one switch it will be 0.
- <root>/curtain/set Set the curtain opening value (0-100), 0 means closed, 100 opened. "on", "off", "pause" pilots buttons.
- <root>/rgb/set Set the color using this topic, your can either send an "#RRGGBB" value or "RRR,GGG,BBB" (0-255 each).
- <root>/hsv/set Set the color using hue (0-360), saturation (0-100) and value (0-100) values, comma separated.
- <root>/brightness/set Set the brighness (0-255).
- <root>/channel/#/set Set the value for a single color channel (0-255). Replace # with the channel ID (starting from 0 and up to 4 for RGBWC lights).
- <root>/mired/set Set the temperature color in mired.
- <root>/status The device will report a 1 to this topic every few minutes. Upon MQTT disconnecting this will be set to 0.
- Other values reported (depending on the build) are: firmware and version, hostname, IP, MAC, signal strenth (RSSI), uptime (in seconds), free heap and power supply.

All messages (except the device status) will be included in a JSON payload along with the timestamp and hostname and sent under the <root>/data topic.
Messages will be queued and sent after 100ms, so different messages could be merged into a single payload.
Subscriptions will still be done to single topics.

Address of the NoFUSS server

Home Assistant MQTT discovery. Enable / disable, then save to trigger the update.

The prefix for the discovery topic e.g. <prefix>/switch/espurna-123456/config

Set the Retain flag when sending the messages.

With every POST to thinkspeak.com only enqueued fields are sent. If you select to clear the cache after every sending this will result in only those fields that have changed will be posted. If you want all fields to be sent with every POST do not clear the cache.

Sticky variables are persistent, once defined the first time they will be always available until next reboot (they do not persist across reboots). Non sticky variables are only available during the next rule execution, just after being defined, and then removed. This applies to status, sensor and MQTT variables equally. Mind that calling a non-existing variable from a rule will make it silently fail.

Number of times to repeat transmission