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Home Assistant
:house_with_garden: Open source home automation that puts local control and privacy first.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Are you content with using your phone to change it? If so, you could use Home Assistant to change to the output device: https://www.home-assistant.io/integrations/webostv/
If you want to setup a shortcut on your remote to swap it, you would need root your TV and then you could use this to setup the remote shortcuts (note it doesn't have direct support for audio output switching yet, but should soon, or you could setup HA as mentioned above and then this can trigger HA automations): https://github.com/andrewfraley/magic_mapper