The key to TTS on a google device is to get it to use an internal IP address, with no encryption. Google Home devices ALWAYS use google DNS servers, so if your router doesn’t support loopback, any internal DNS will be ignored. Additionally, any SSL certificate generated by letsencrypt will only be valid on your external IP address, so the google device won’t be able to verify the security certificate. Additionally, I believe they do not support self signed certificates.
My work around is:
I run duckdns, which handles my letsencrypt certificate, but in my configuration.yaml, I only have:
- http: mydomain.duckdns.org
note that I DO NOT have https:// nor any of the security certificates listed.
I can now access home assistant from inside my own network via: http://INTERNAL_IP_ADDRESS:8123
I then have NGINX add on installed. This provides me with SSL access to my home assistant from outside my network (Only port 443 needs to be forwarded)
then to get Google tts to work, you need:
tts:
- platform: google
base_url: http://INTERNAL_IP_ADDRESS:8123