HA as an Z-Wave <> MQTT gateway?

Configuration
1

Is it possible to publish MQTT commands to control Z-Wave devices exposed by HA?

Config snippet (which I know is overkill, but trying everything ATM):

mqtt:
  broker: util
  port: 1883
  client_id: ha-util
  username: !secret mqtt_username
  password: !secret mqtt_password

mqtt_eventstream:
  publish_topic: util-hass-pub
  subscribe_topic: util-hass-sub

mqtt_statestream:
  base_topic: homeassistant
  publish_attributes: true
  publish_timestamps: true
  exclude:
    domains:
      - sun
      - weather
      - automation

Running “mosquitto_sub -v -h util -t ‘#’”, I can see a bunch of homeassistant/zwave/{device} information.

The following commands have no effect on the target, but are definitely received by the MQTT broker.
mosquitto_pub -h util -t “util-hass-sub/zwave/coach_lights/state/set” -m 1
mosquitto_pub -h util -t “util-hass-sub/zwave/coach_lights/state/set” -m on
mosquitto_pub -h util -t “util-hass-sub/zwave/coach_lights/state” -m 1
mosquitto_pub -h util -t “util-hass-sub/zwave/coach_lights/state” -m on

Any thoughts?

2

Looking at the documentation, Home Assistant requires an MQTT Broker to talk to MQTT devices. Since MQTT is bidirectional it should be possible with an MQTT sensor.

3

I am using a broker (snippet from config posted above):

mqtt:
  broker: util
  port: 1883
  client_id: ha-util
  username: !secret mqtt_username
  password: !secret mqtt_password

The devices I’m attempting to control via MQTT are not native MQTT devices. They are Z-Wave devices that I would like to control using MQTT with HA acting as the translator between MQTT and Z-Wave.

I’ve not been able to find anything in the HA docs or forums showing how to do such a thing. It seems it should be possible, but not sure what I’m missing if it is.

4

I thought you might be able to use an HA MQTT sensor to “listen” for the MQTT command and then use the sensor in an automation to control the z-wave device.

5

Interesting idea. I may consider that as plan B in case I can’t get it to work “out of the box”.

Thanks!

6

Is this relevant?

7

Sort of. I don’t run hassio, but I was able to install and compile the gateway that this addon uses. It’s a “better than nothing” solution. I’ve decided to scrap the idea for now to get more pressing things around the house done.

Thanks though!