Specifically for the Chomecast Audio driver, it appears that Set Volume, Mute, etc. commands only work if the device's mediaSource state is set to Hubitat. The only way to get that state is by initiating a Speak or Play Track command. I know you can just use a "space" for the speak string or track name to get the media source state where you need it, but it seems like this should be built in to the driver. Otherwise EVERY rule that uses an audio-only Chromecast Integration device needs to start with the same "dummy" command. Or maybe there is another way around this? Maybe at least a custom command for setMediaSource(Hubitat) so at least (maybe) I can set the volume without triggering google's "chime" that it plays before every TTS or track?
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