There are options to bridge MQTT brokers, but that is not always a solution when using (want to use) multiple mqtt brokers.
Why is it not possible to have multiple brokers? One inside your own network and another outside on the big bad internet, so that external sensors can reach them easily so that I don’t have to open up my local broker to the internet…
The real question is why did you post this twice?
Closing as duplicate of:
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