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Explain how mqtt sensors are influenced with expire_after option when a retained payload was used #40043

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Explain how mqtt sensors are influenced with expire_after option when a retained payload was used #40043

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@jbouwh jbouwh commented Jul 17, 2025

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Explain how mqtt sensors are influenced with expire_after option when a retained payload was used

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c0ffeeca7
c0ffeeca7 reviewed Jul 17, 2025
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@c0ffeeca7 c0ffeeca7 marked this pull request as draft July 18, 2025 05:20
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Update source/_integrations/binary_sensor.mqtt.markdown
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Co-authored-by: c0ffeeca7 <38767475+c0ffeeca7@users.noreply.github.com>
@jbouwh jbouwh marked this pull request as ready for review July 18, 2025 11:14
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jbouwh commented Jul 18, 2025

@c0ffeeca7 Thanks for reviewing, may be you can have a final look?

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What is meant by "Note that when a sensor's value was sent retained to the MQTT broker"?

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jbouwh commented Jul 18, 2025

What is meant by "Note that when a sensor's value was sent retained to the MQTT broker"?

The sensors state is sent to a topic. The user can set a "retain" flag to retain the last send value at the broker. When a client subscribes to that topic, it will receive the last retained value upon subscription. When there is no retain flag clients will only receive live values after they have subscribed.

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MQTT sensors' expire_after ignored on config reloads and restarts
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