MQTT Light - Command template missing for HS value

Configuration
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1

Hello there,

When using MQTT light, there is generally a template option:

  • to extract value (incoming), for instance: rgb_value_template, color_temp_value_template, hs_value_template…
  • to format the payload (outgoing): rgb_command_template, color_temp_command_template, …

But unfortunately, formatting the payload for HS (Hue-Saturation) variable is not possible.

It is possible to extract incoming value using hs_value_template.

But I was expecting an equivalent hs_command_template. Not to be found in the documentation, and when adding to the config, Hassio not happy.

Is this config variable yet to be added, or was there a particular constraint?

Thanks.

2

Can you not convert hs to rgb and/or color temp? I’d assume HA does this in the background and only lets you choose the command for rgb and color temp.

3

Yes indeed, but would be easier if the hs_command_template was present.

In this particular case, the device is expecting hue/saturation values in JSON:

{ "h": xxx, "s": xxx }

Following your hint, now using RGB options:

  • rgb_value_template: template converts HSV to RGB
  • rgb_command_template: template converts RGB to HSV

How to make conversions using Jinja2? Check out this topic: Using HSV / HSB to set colored lights

Pretty long templates, but they do their job :+1:
In my case, minified the code into a single line.

4 
  - unique_id: board_01_rgb_01
    name: "Board 01 RGB 01"
    availability:
      topic: "board-01/availability/status"
      payload_available: "online"
      payload_not_available: "offline"
    state_topic: "board-01/light/relay_01/state"
    state_value_template: "{{ value_json.state | lower }}"
    command_topic: "board-01/light/relay_01/state"
    payload_on: "on"
    payload_off: "off"
    brightness_state_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    brightness_value_template: "{{ value_json.brightness }}"
    brightness_command_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    brightness_command_template: '{ "brightness": {{ value }} }'
    color_temp_state_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    color_temp_value_template: "{{ value_json.color_temp }}"
    color_temp_command_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    color_temp_command_template: '{ "color_temp": {{ value }} }'
    hs_state_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    hs_value_template: "{{ value_json.color.hue }}, {{ value_json.color.saturation }}"
    hs_command_topic: "zigbee2mqtt/rgb_cw_01_01/set"
    hs_command_template: '{ "color": {"hue": {{ hue }}, "saturation": {{ sat }}} }'
    qos: 0

This is my configuration.
This is a special rgb light. When i push on-off button i send command to mqtt relay.
When i change color, brightness or color temperature, i send command to mqtt light.