Can 2 instances of Home Assistant use the same MQTT server?

Configuration
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On my main MQTT broker, I have two types of devices. Tasmota (esp based switches) and Zigbee2MQTT. They publish to the homeassistant topic that my first home assistant instance is configured with.

I’m in the process of transitioning to a new home assistant instance. Is it OK to have both HA instances configured to the same MQTT broker and consuming the same HA topic? I’m not sure if that hurts anything - it seems like there’s some back and forth between the Z2M and Tasmota and the first HA instance?

Wondering how other people transition from old to new instances of HA like this.

Edit: i meant to say that i can see how it’s possible with just simply setting the configs to use the same mqtt broker. I’m just wondering if anyone has specific experience with z2m or tasmota.

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Having two HA instances accessing the one broker is perfectly fine.

1 Like
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Not only can they use the same broker, but that’s also one of the features of MQTT. You can use a public MQTT broker or subscribe to one, or set up your own on a virtual lan. It’s remarkably flexible for example, if you have devices at a vacation cabin that you want to control from home.