[Automation, HowTo?] Update/synchronize custom device only one attribute

@Domoticon wrote:

Hi2UAll!

I need some help synchronizing/updating rgb-values (only) from a custom Mqtt-device to a LED device.

The source device is getting rgb-values from a custom MQTT-device to a Fibaro HC2 integrated LED-device.
Source: light.mqtt_circadian.attributes[“rgb_color”] <-- trigger in automation
Destination: light.woonkamer_eethoek_led_strip.attributes[“rgb_color”] <-- action in automation?

I only just want to update only this attribute, without using the turn_on service and/or changing other attributes.

Maybe an noob question, but can anyone show me how to do this?

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