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restore switch state (#18169)

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Matthias Alphart 2021-06-24 22:07:20 +02:00 committed by GitHub
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source/_integrations/knx.markdown
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@ -1468,8 +1468,10 @@ invert:
default: false
{% endconfiguration %}
Some KNX devices can change their state internally without any messages on the KNX bus, e.g., if you configure a timer on a channel. The optional `state_address` can be used to inform Home Assistant about these state changes. If a KNX message is seen on the bus addressed to the given state address, this will overwrite the state of the switch object.
For switching actuators that are only controlled by a single group address and can't change their state internally, you don't have to configure the state address.
The optional `state_address` can be used to inform Home Assistant about state changes not triggered by a telegram to the `address` e.g., if you configure a timer on a channel. If a KNX message is seen on the bus addressed to the given state address, this will overwrite the state of the switch object.
Switch entities without a `state_address` will restore their last known state after Home Assistant was restarted.
Switches having a `state_address` configured request their current state from the KNX bus.
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