Chromecast control from home assistant without internet?

Configuration
1

I am using Node Red and the cast v2 node to initiate music play on a samsung sound bar. Works fine when the internet is connected, but for some reason, the Samsung sound bar and a Nest Audio device are unavailable when the internet is out.

Is this normal behaviour? Any way around this? Can i use any method to get my local jellyfin music playing on my local chromecast devices without it connecting to the internet first?

Thanks for any help and ideas

2

Chromecast relies on the internet to work. Apps send a message to the Chromecast using a web socket and ask it to load an application by the apps ID, which the Chromecast looks up at Google to translate a ID to an actual web resource on the internet. The Chromecast is essentially a cut down glorified Chrome web browser, it cannot do anything with an internet connection.