Motion sensor, switch and more

[Leopoll]

I have a standard light control scheme using a switch and a motion sensor. If the light is turned on by the switch, context.flow is TRUE and the motion sensor cannot turn off the light.

But what if I turn on the light from the HA application or through the smart speaker assistant? Then no events are fired so it's impossible to set the context.flow
What is usually done in such cases?

[juanbal]

Typically MQTT is used for that.
The light (or the device controlling it) would publish light states into the MQTT broker.
Node-red would subscribe to those publications using the MQTT IN node and that will get your flows triggered each time there's a change with the light state.

[Leopoll]

@juanbal

Typically MQTT is used for that

Thank you. But how can you determine what triggered the turning on of the light? I need to determine that the light turned on NOT from the motion sensor.

[juanbal]

I have some lights that during the night are automatically turned on using a motion sensor.
Those lights are automatically turned off after 2 minutes using a trigger node.

When the motion sensor triggers on the light I set a flow context variable (activatedByMovement=true).
Before turning off the light after the 2 minutes, I check if activatedByMovement=true. If yes, the light is turned off. If false or null do nothing.

Here's the flow

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