sorry for my late responce,
was strugling with building a managementconsole for a few domoticz servers over the wan (manage family configs)..
Build that with Node-red and the IFTTT dzvents script from @waaren
For My Google home integration i use
- domoticz normal installation
- domoticz MQTTT normal installation
- domoticz mqtt plugin (publish topic (out + /)
- dzvents script DZ_service_ifttt and a user variable IFTTTvar
- Node-red, different hand made flows
- Most important part of node-red is indeed the NORA node. For each device is domoticz you have to create a NORA device in node-red.
(after that, google home and your nest home will show it..)
- set your router (port forwarding)
For the speech part (english only) i use IFTTT, (IF = google assistant, that is webhook)
(the webhook is a call to NODE-red (which is connect to MQTTT and domoticz)
So my NEST hub speaks dutch for the normal google home instructions, with english i manage IFTTT domoticz device calls on my nest hub and i can click on the "nora/noderedc/domoticz"devices on my nest hub
First part is to get the major parts working with the normal manuals on the internet: mqtt, node-red, domoticz/mqtt
For each domoticz device you have to add a nora device and handle traffic from domoticz to nora to google by flows...
that is a lot of work! see my google home nora flow

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Raspberry (raspbian on rpi 3) , Domoticz Beta, dzVents , RFXtrx433e, P1, Hue, Yeelight, Zwave+, X10, ESP(easy), MQTT,Weather Underground, System Alive Checker, Domoticz Remote Server to RPI with Google Assistant,
Jablotron connection, Ikea