Node-red-contrib-alexa-smart-home NPM

Features

A wide variety of supported device types and capabilities/ traits (details below)
Real-time state reporting in the Alexa and Google Home apps.
Alexa and Google Home support, you can choose to use either, or both (note Google Home integration is currently awaiting certification but you can request access)

To enable Google Home/ Google Assistant functionality follow the instructions here.

Getting Started

Using the (free to use) hosted instance you can be up and running in just a few minutes:

Setup an account here.
Once logged in, create your devices here.
Install and configure these nodes to your Node-RED instance.
Build relevant flows, see examples here.

Alternatively, you can deploy your own instance of this service, follow these instructions.

Supported Devices/ Capabilities

Alexa Interface	Google Trait	Supported Controls	Example Usage	Useful Links
Brightness Control	Brightness	0-100%, increase, reduce, dim	MQTT Out	Any MQTT-enabled bulb/ smart light
Channel Control	Experimental (number only)	Any number or name, i.e. 101, BBC 1, Channel 4	HTTP Out	Any HTTP-enabled endpoint
Contact Sensor	ContactSensor	No commands Note you can also use this interface as a trigger.	N/A	"Alexa, is the Kitchen window open?"
Color Control	ColorSetting	Red, Green, Blue, Purple, Yellow etc.	MQTT Out	Any MQTT-enabled bulb/ smart light
Color Temperature Control	ColorTemperature	Increase, Decrease, Warm, Warm White, Incandescent, Soft White, White, Daylight, Daylight White, Cool, Cool White***	MQTT Out	Any MQTT-enabled bulb/ smart light
Input Control	Not Supported	HDMI1, HDMI2, HDMI3, HDMI4, phono, audio1, audio2 and "chromecast"	Yamaha Music Cast Amplifier	node-red-contrib-avr-yamaha
Lock Control	Experimental	Lock, Unlock	MQTT Out	Any MQTT connected Lock
Motion Sensor	MotionSensor	No commands You can use this interface as a trigger with Alexa	N/A
Playback Control	Experimental	Play, Pause, Stop, FastForward, Rewind, StartOver, Next, Previous	Kodi RPC	Http Response Node with Kodi RPC Commands
Percentage Controller	Not Supported	0-100%, increase %, decrease %	HTTP Out, MQTT Out	Fans, AC Unit
Power Control	OnOff	On, Off	MQTT Out	Any MQTT-enabled switch, Socket etc
Scene Control	Scene	Turn On	Multiple	String together a number of nodes for your scene, i.e. lighting, TV on, ACR on
Speaker	Experimental	+/- volume, set to specific number, mute	Yamaha Music Cast Amplifier	node-red-contrib-avr-yamaha
Speaker (Step)	Not Supported (use Speaker)	+/- volume, mute	Yamaha Music Cast Amplifier	node-red-contrib-avr-yamaha
Temperature Sensor	Not Supported	No commands	N/A	View/ query temperature in any room by voice or Alexa App
Thermostats Control (Single set-point only)	TemperatureSetting	Set specific temp**, increase/ decrease	MQTT Out	Any MQTT connected thermostat/HVAC