Hi, I would like to expose an Home Assistant light (Hue light) to my KNX system in a bi-directional way.
What I have done so far is:
- Defined group addresses for the Hue light in ETS
- Added a KNX Light entity in the HA KNX integration pointing to those GA
- Added a blueprint and related automation to sync the KNX light with the Hue light bi-directionally
If I control the Hue light, the KNX one is synced, and vice-versa. But if I send a on/off message from ETS to either the OnOff GA or the OnOff State GA, nothing happens.
What should I do to make HA react to the values I write from ETS to the GA?
This is my blueprint:
blueprint:
name: Bidirectional Light Sync (power + brightness + kelvin)
description: |
Sincronizza accensione/spegnimento, luminosità e temperatura colore tra due luci in entrambe le direzioni.
Evita cicli infiniti verificando differenze reali prima di scrivere. Supporta anche la conversione mireds↔kelvin.
domain: automation
source_url: https://example.com/asa/bidir_light_sync
input:
light_a:
name: Light A
description: Prima luce (es. Hue)
selector:
entity:
domain: light
light_b:
name: Light B
description: Seconda luce (es. KNX)
selector:
entity:
domain: light
mode: queued
trigger:
# --- A → B ---
- platform: state
entity_id: !input light_a
id: a_state
- platform: state
entity_id: !input light_a
attribute: brightness
id: a_brightness
- platform: state
entity_id: !input light_a
attribute: color_temp_kelvin
id: a_kelvin
- platform: state
entity_id: !input light_a
attribute: color_temp
id: a_mireds
# --- B → A ---
- platform: state
entity_id: !input light_b
id: b_state
- platform: state
entity_id: !input light_b
attribute: brightness
id: b_brightness
- platform: state
entity_id: !input light_b
attribute: color_temp_kelvin
id: b_kelvin
- platform: state
entity_id: !input light_b
attribute: color_temp
id: b_mireds
variables:
light_a: !input light_a
light_b: !input light_b
is_from_a: "{{ trigger.id.startswith('a_') }}"
src: "{{ light_a if is_from_a else light_b }}"
dst: "{{ light_b if is_from_a else light_a }}"
# Stati e attributi sorgente/destinazione
src_state: "{{ states(src) }}"
dst_state: "{{ states(dst) }}"
src_brightness: "{{ state_attr(src, 'brightness') }}"
dst_brightness: "{{ state_attr(dst, 'brightness') }}"
# Kelvin calcolato (fallback da mireds)
src_kelvin: >-
{% set k = state_attr(src, 'color_temp_kelvin') %}
{% if k is not none %}
{{ k }}
{% elif state_attr(src, 'color_temp') %}
{{ (1000000 / state_attr(src, 'color_temp')) | round(0) }}
{% else %}
{{ none }}
{% endif %}
dst_kelvin: >-
{% set k = state_attr(dst, 'color_temp_kelvin') %}
{% if k is not none %}
{{ k }}
{% elif state_attr(dst, 'color_temp') %}
{{ (1000000 / state_attr(dst, 'color_temp')) | round(0) }}
{% else %}
{{ none }}
{% endif %}
# Limiti Kelvin della destinazione
dst_min_k: >-
{% set min_k = state_attr(dst, 'min_color_temp_kelvin') %}
{% if min_k is not none %}
{{ min_k }}
{% elif state_attr(dst, 'max_mireds') %}
{{ (1000000 / state_attr(dst, 'max_mireds')) | round(0) }}
{% else %}
{{ none }}
{% endif %}
dst_max_k: >-
{% set max_k = state_attr(dst, 'max_color_temp_kelvin') %}
{% if max_k is not none %}
{{ max_k }}
{% elif state_attr(dst, 'min_mireds') %}
{{ (1000000 / state_attr(dst, 'min_mireds')) | round(0) }}
{% else %}
{{ none }}
{% endif %}
clamped_kelvin: >-
{% if src_kelvin is not none and dst_min_k is not none and dst_max_k is not none %}
{{ [dst_min_k, [src_kelvin, dst_max_k] | min] | max }}
{% else %}
{{ src_kelvin }}
{% endif %}
condition: []
action:
- choose:
# --- POWER ON/OFF ---
- conditions:
- condition: template
value_template: >-
{{ trigger.id in ['a_state', 'b_state']
and trigger.to_state is not none
and trigger.to_state.state in ['on','off']
and trigger.to_state.state != dst_state }}
sequence:
- choose:
- conditions: "{{ trigger.to_state.state == 'on' }}"
sequence:
- service: homeassistant.turn_on
target: { entity_id: "{{ dst }}" }
- conditions: "{{ trigger.to_state.state == 'off' }}"
sequence:
- service: homeassistant.turn_off
target: { entity_id: "{{ dst }}" }
# --- BRIGHTNESS ---
- conditions:
- condition: template
value_template: >-
{{ trigger.id in ['a_brightness','b_brightness']
and src_brightness is not none
and src_brightness != dst_brightness }}
sequence:
- service: light.turn_on
target: { entity_id: "{{ dst }}" }
data:
brightness: "{{ src_brightness | int }}"
# --- KELVIN (da color_temp_kelvin o mireds) ---
- conditions:
- condition: template
value_template: >-
{{ trigger.id in ['a_kelvin','b_kelvin','a_mireds','b_mireds']
and clamped_kelvin is not none
and dst_kelvin is not none
and clamped_kelvin != dst_kelvin }}
sequence:
- service: light.turn_on
target: { entity_id: "{{ dst }}" }
data:
kelvin: "{{ clamped_kelvin | int }}"
!