I have cast-web-api setup on my Raspberry Pi 4B to use my Nest Mini for certain ST automation announcements but the functionality is limited - can’t control announcement volume (always 50%) and it won’t resume if something was already playing on the speaker.
You can find it here [RELEASE] cast-web v1.2.1 - Chromecast Device Handler & SmartApp
Also, there’s an installation video tutorial here How to Control Google Home in SmartThings | Making Google Speak in 2021 - YouTube
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