Terminal

The ESPurna firmware outputs debug information to the terminal interface (except for the Sonoff Dual and the Sonoff RF Bridge). You only have to connect your USB2UART board to the TX, RX and GND pins in your board and open a terminal at 115200 baud (8,N,1).

But the terminal not only shows information about what the device is doing, it also accepts several commands thanks to the Embedis library. You can get a list of these commands typing help and enter. It's recommended to enable echo to see what you are typing. Backspace or delete won't work in the terminal.

Available commands as of 1.12.1 (the actual list of available commands will depend on the built-in functionalities of your specific image):

command	description
brightness <value>	Sets RGB brightness (only for lights)
channel <id> <value>	Sets value for channel #id (only for lights)
color <value>	Sets RGB color (only for lights)
commands	Lists available commands
crash	Shows stack dump from last crash
del <key>	Deletes setting from EEPROM. Built-in
dictionaries	Available dictionaries. Built-in
eeprom.dump [<ascii>]	Dumps EEPROM contents to console (pass a 1 to print ASCII characters)
erase.config	Tries to reset SDK config and restarts the board
factory.reset	Deletes all settings from EEPROM and resets the device
get <key>	Shows the value a the given setting
gpio <id> [<value>]	Gets or sets the GPIO #id state
ha.clear	Clear retained message for MQTT Discover in Home Assistant
ha.config	Output Home Assistant configuration code
ha.send	Send message for MQTT Discover in Home Assistant
hardware	Access hardware resources. Built-in. Not implemented
heap	Shows free heap
help	Lists available commands (alias for "commands")
info	Shows info about the device, the firmware and the WiFi connection
kelvin	Sets the temperature color in Kelvin (only for lights)
keys	Lists the setting keys stored in EEPROM.
magnitudes	Lists sensor magnitudes available
mired	Sets the temperature color in Mired (only for lights)
mqtt.reset	Reconnects to the MQTT broker using current settings (only if MQTT support)
nofuss	Forces a check agains NoFUSS server (only if NoFUSS support)
ota <url>	Downloads a firmware image from the give URL and updates the board
publish	Built-in publish/subscriber method. Not implemented
read	Access hardware resources. Built-in. Not implemented
relay <id> [<value>]	Gets or sets the relay #id state
reset	Resets board
select	Built-in. Not implemented
set <key> <value>	Changes the value of the given setting
subscribe	Built-in publish/subscriber method. Not implemented
unsubscribe	Built-in publish/subscriber method. Not implemented
uptime	Shows the current uptime in seconds
wifi.ap	Disconnect and create an access point
wifi.reset	Reconnects to the WiFi using current settings
wifi.scan	Scans for WiFi networks around and shows info
write	Access hardware resources. Built-in. Not implemented

You can read about some of the built-in commands in the Embedis wiki.

Settings

The get, set and del commands let you query, modify or delete configuration settings. Most of those settings can be changed from the web interface.

Settings are stored in EEPROM. They persist across reboots and they survive firmware or filesystem updates (both wired or OTA) unless you change the flash layout.

This is a list of current settings with description and default values. '#' means a number starting from 0.

Key	Description	Possible values	Default value
ALEXA
alexaEnabled	Is Alexa integration enabled?	0 (no) or 1 (yes)	1 (yes)
API
apiEnabled	Should REST API be enabled?	0 (no) or 1 (yes)	0 (no)
apiKey	API Key required for all REST API requests	HEX string	(auto-generated)
apiRealTime	Should the API should respond with real time values or filtered ones?	0 (no) or 1 (yes)	0 (no)
BUTTONS
btnDelay	Double click delay in milliseconds	an integer	500
DOMOTICZ
dczEnabled	Should Domoticz be enabled?	0 (no) or 1 (yes)	1 (yes)
dczTopicIn	Topic to send values to Domoticz		domoticz/in
dczTopicOut	Topic where Domoticz sends commands to		domoticz/out
dczRelayIdx#	IDX in Domoticz for the n-th relay (both to get and set value)	An integer, 0 or empty to disable report	0
dczMagnitude#	IDX in Domoticz for the n-th magnitude (type "magnitudes" for a list of available magnitudes)	An integer, 0 or empty to disable report	0
GENERAL
adminPass	Password to access web interface, connect to the device in AP mode or perform OTA updates	String of at least eight characters (letters, numbers or the underscore) with at least one number, one lowercase and one uppercase letter	fibonacci
hostname	Hostname for the device, device would be accessible in http://hostname.local	A string	Device name plus 6 HEX digits
board	Board id (this setting is meant for future identification)
boardName	Board id (this setting is used to identify the board on OTA updates)
cfg	Configuration version (this setting is meant for future identification)
loopDelay	Delay in milliseconds at the end of the main loop (reduces power consumption but also responsiveness)	A number equals or greater than 0	10
HOME ASSISTANT
haEnabled	Home Assistant auto-discover feature enabled	0 (no) or 1 (yes)	1 (yes)
haPrefix	Home Assistant MQTT prefix	A string	homeassistant
I2C
i2cCST	I2C Clock Stretch Time in milliseconds (only for I2C_Brzo library)	A positive number	200
i2cFreq	I2C SCL frequency (only for I2C_Brzo library)	A positive number	1000
i2cSCL	SCL GPIO	A valid digital GPIO	5
i2cSDA	SDA GPIO	A valid digital GPIO	4
INFLUXDB
idbDatabase	InfluxDB database name	A string
idbEnabled	Enable sending data to InfluxDB	0 (no) or 1 (yes)	0 (no)
idbHost	InfluxDB database host	A string
idbPassword	InfluxDB database password	A string
idbPort	InfluxDB database port	An integer	8086
idbUsername	InfluxDB database username	A string
LED
ledMode#	Behavior for the n-th LED (currently only supported for the first LED)	An of the LED modes defined in general.h	1 (LED_MODE_WIFI)
MQTT
mqttClientID	MQTT client ID	A string	(auto-generated)
mqttEnabled	Enable sending MQTT messages	0 (no) or 1(yes)	1 (yes)
mqttFP	Fingerprint for SSL server	A 20 hex values separated by ':'
mqttGetter	MQTT getter suffix	A string with a leading slash
mqttGroup#	Synchronization group for the n-th relay	An MQTT topic
mqttGroupColor	Synchronization group for the color	An MQTT topic
mqttGroupInv#	Logic for the synchronization group for the n-th relay	0 (same) or 1(inverted)	0 (same)
mqttKeep	Keep alive time in seconds	A number greater than 10	30
mqttPassword	Password to connect to the MQTT broker	A string
mqttPort	Port the MQTT is listening to	A number	1883
mqttQoS	QoS level for MQTT messages and subscriptions	0 (at most one), 1 (at least one) o 2 (one and only one)	0 (at most one)
mqttRetain	Retain flag for messages	0 (don't retain) or 1 (retain)	1 (retain)
mqttServer	Address of the MQTT server	An IP, empty to disable MQTT connection
mqttSetter	MQTT setter suffix	A string with a leading slash	/set
mqttTopic	Root topic for all MQTT topics of this device	A string, {identifier} will be replaced by the hostname	/test/switch/{identifier}
mqttUseJson	Whether to group messages in a JSON format	0 (no) or 1(yes)	0 (no)
mqttUser	User to connect to the MQTT broker	A string
mqttUseSSL	Whether to connect using TLS/SSL	0 (no) or 1(yes)	0 (no)
LIGHT
brightness	Brightness value	0 to 255	255
ch#	Value for the n-th channel	0 to 255	0
useColor	Use first 3 channels for RGB	0 (no) or 1 (yes)	1 (yes)
useGamma	Use gamma correction for color channels	0 (no) or 1 (yes)	0 (no)
useWhite	Use white channel if all 3 RGB have the same value	0 (no) or 1 (yes)	0 (no)
useCSS	Use CSS (#FF0000) or comma separated values (255,0,0) for color reporting	0 (CSV) or 1 (CSS)	1 (CSS)
useRGB	Use first three channels as color channels (only if light has at least 3 ch)	0 (no) or 1 (yes)	1 (yes)
useTransitions	Use color transitions	0 (no) or 1 (yes)	1 (yes)
NOFUSS
nofussEnabled	Enable checking updates against a NoFUSS server	0 (no) or 1(yes)	0 (yes)
nofussInterval	Milliseconds between NoFUSS update checks	Number	3600000
nofussServer	NoFUSS service URL	URL, empty to disable NoFUSS
NTP
ntpDST	Enable daylight save time	0 (no) or 1 (yes)	1 (yes)
ntpOffset	Time offset from UTC	An integer	1
ntpServer#	NTP server to use (up to 3 different servers)	A string
RELAY
relayBoot#	Relay boot mode, what state the relay should have upon boot	0 (off), 1 (on), 2 (same as before), 3 (opposite from before)	0 (off)
relayPulse#	Relay pulse mode	0 (no pulse), 1 (normally OFF), 2 (normally ON)	0 (no pulse)
relayTime#	Relay pulse time in seconds	Number	1
relaySync	Relay synchronization mode	0 (no sync), 1 (at most one relay ON), 2 (one and only relay ON), 3 (all the same)	0 (no sync)
RFBRIDGE
rfChannel	Channel number (only for the RF module)	A number	31
rfDevice	Device number (only for the RF module)	A number	1
RFBRIDGE
rfbOFF#	Code to turn OFF the n-th device	A string
rfbON#	Code to turn ON the n-th device	A string
SCHEDULER
schAction#	Action to perform for n-th schedule	0 (turn off), 1 (turn on) or 2 (toggle)	0 (turn off)
schHour#	Time (hour) at which the n-th schedule action should take place	0 to 23	0
schMinute#	Time (minute) at which the n-th schedule action should take place	0 to 59	0
schSwitch#	Switch to perform the action of the n-th schedule	0 to number of relays (0-based)	0
schWDs#	Weekdays at which the n-th schedule action should take place. Encoded as string of numbers where Monday is 1	A string	1234567
SENSORS
pwrRatioC	Ratio for current value	(will depend on the actual sensor)	(will depend on the actual sensor)
pwrRatioP	Ratio for power value	(will depend on the actual sensor)	(will depend on the actual sensor)
pwrRatioV	Ratio for voltage value	(will depend on the actual sensor)	(will depend on the actual sensor)
pwrVoltage	Nominal RMS mains voltage	125, 220, 230... depends on country	230
snsRead	Sensor read interval in seconds	A positive number greater than 2	6
snsReport	Sensor report every N reads	A positive number greater than 0	10
tmpUnits	Temperature unit to use	0 (Celsius) or 1 (Fahrenheit)	0 (Celsius)
tmpCorrection	Temperature correction in C or F degrees	Any number	0
TELNET
telnetSTA	Enable telnet when connected to a router (STAtion mode)	0 (no) or 1 (yes)	0 (no)
THINGSPEAK
tspkEnabled	Enable reporting values to Thingspeak platform	0 (no) or 1 (yes)	0 (no)
tspkKey	API Key for the channel to send data to	A string provided by Thingspeak
tspkMagnitude#	Field number for n-th magnitude	The field number to report to (1 to 8) or 0 to disable reporting	0
tspkRelay#	Field number for n-th relay	The field number to report to (1 to 8) or 0 to disable reporting	0
WEB
webPort	Port to listen to HTTP requests	An integer	80
WIFI
dns#	DNS for the n-th WiFi network when using static IP	IP
gw#	Gateway for the n-th WiFi network when using static IP	IP
ip#	Static IP for the n-th WiFi network	IP
mask#	Netmask for the n-th WiFi network when using static IP
pass#	Password of the n-th WiFi network	String
ssid#	SSID or name of the n-th WiFi network	String

Usage

You can configure your WiFi connection without web interface through the terminal. For instance:

set ssid0 myhome
set pass0 mypass
wifi.reset