Configurable autodiscovery_topic_prefix #248
Description
Feature Description
I'm using a (Docker) container for hm2mqtt.
Currently only the data MQTT_TOPIC_PREFIX is configurable.
It would be nice to have the AUTODISCOVERY_TOPIC_PREFIX configurable as well.
I have a general autodiscovery topic, not named after a system like "homeassistant", which is currently the unconfigurable default for hm2mqtt.
In most publishers you are able to configure the autodiscovery topic, like solaredge2mqtt, zigbee2mqtt, zwave-js-ui do and subscribers like Domoticz and HomeAssistant are configurable as well.
What would be workable is:
When AUTODISCOVERY_TOPIC_PREFIX is NOT SET it takes the default "homeassistant"
When AUTODISCOVERY_TOPIC_PREFIX is SET, it takes what is set. :)
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