Get current value after subscription

lmaarsen
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8 years 1 month ago #3120 by lmaarsen

Get current value after subscription was created by lmaarsen

Hi,

My IoT hardware is working fine, but I can't find a easy way to get the current value of a paramter after I subscribed to that topic. I need a change of value before I get the value.

I read something about the retained flag.

Any idea?

BG,
Bert

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imsony
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7 years 11 months ago #3287 by imsony

Replied by imsony on topic Get current value after subscription

I also need same feature. I have terminal and it sleeps in idle and waking up in every 10 minutes. If the value of topic is changed while terminal is sleeping, I want to get last value when the terminal waked. MQTT standard fixed that problem with retained flag. But I could not find how to activte that flag on module properties.

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Zaitsev
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7 years 11 months ago #3288 by Zaitsev

Replied by Zaitsev on topic Get current value after subscription

So do I. I found this feature in local EasyIot.exe, but failed to find one on the cloud.

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EasyIoT
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7 years 11 months ago #3290 by EasyIoT

Replied by EasyIoT on topic Get current value after subscription

Ok, we will add this in Cloud...

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imsony
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7 years 11 months ago #3291 by imsony

Replied by imsony on topic Get current value after subscription

This is great news, hope to see it soon,

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EasyIoT
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7 years 10 months ago #3305 by EasyIoT

Replied by EasyIoT on topic Get current value after subscription

In new Cloud version all topics are retain by default when sending commands. After subscription last value will be received. If you are using ESP8266 to publish value also change code to send state as retain:

myMqtt.publish(topic, valueStr); -> myMqtt.publish(topic, valueStr, 0, 1);

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