When I configure my MySensors Gateway as an Ethernet gateway, and configure HASS in the same way, everything works fine.
However, if I change my MySensors gateway to be an MQTT gateway, the sensors never show up in HASS. I can see the topics being published to using an MQTT client. My HASS configuration looks like this:
mysensors:
gateways:
- device: mqtt
persistence_file: ‘/home/hass/.homeassistant/mysensors.json’
topic_in_prefix: ‘mysensors-in’
topic_out_prefix: ‘mysensors-out’
debug: true
optimistic: false
persistence: true
retain: true
version: 2.0
What did I do wrong?
i have really no clue about MQTT but i think that we should call @martinhjelmare to the rescue 
Have you also configured the mqtt component in home assistant?
You should also check the topic prefixes. The topic where the gateway publishes should go to topic_in_prefix and the gateway’s subscribe topic should go to topic_out_prefix. If you didn’t change the prefixes when writing the mqtt gateway sketch, the prefixes should be configured like this:
topic_in_prefix: 'mygateway1-out'
topic_out_prefix: 'mygateway1-in'
But check how you have setup your gateway sketch.
Ah ha! I didn’t realize the out_prefix was supposed to point to the “in” topic, and vice versa. I’ll give that a shot. Thank you!
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