Help with MQTT sensor data

I have 2 HA instances connected via VPN,

I have never worked with MQTT until now. I want to send sensor data from one HA instance to the other, i’m assuming the best way to do this will be via MQTT.

Any ideas how I can get started with this, the sensor is battery voltage.

Thanks

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MQTT Statestream

For this use case I would highly recommend the Remote Home Assistant integration GitHub - custom-components/remote_homeassistant: Links multiple home-assistant instances together

Much easier to configure.

Yea thanks, thats the route I took and its working well, it’s a shame as I really do need to learn MQTT haha.

Thanks for the sugestion.