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.

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/

Define when heartbeat message will be sent.

This is the interval in seconds how often to send the heartbeat message.

Device hostname can be configured on the GENERAL tab.

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.

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>/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 auto-discovery feature. Enable and save to add the device to your HA console.

These are the settings you should copy to your Home Assistant "configuration.yaml" file. If any of the sections below (switch, light, sensor) already exists, do not duplicate it, simply copy the contents of the section below the ones already present.

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.