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How to know when the an UI is used [message #1734837]

Mon, 13 June 2016 12:12

Tardif Clément

Messages: 4
Registered: April 2016

Junior Member

Hello,

I'm try trying to Implement a binding. The devices that I want to include cannot communicate alone (I have to send to them a command and after they reply).

Thus, in order to know at every moment the state of my devices, I am forced to send a command every 2 seconds. I want to know if it's possible to know when a UI is used. In that way, I will be able to reduce the number of radio transmission.

Clément

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Re: How to know when the an UI is used [message #1734906 is a reply to message #1734837]

Mon, 13 June 2016 15:35

Kai Kreuzer

Messages: 657
Registered: December 2011

Senior Member

Hi Clément,

No, there is no way to tell whether a UI is currently open or not. This might also not suffice, because you might also have rules or remote systems that are interested in state updates.
The concept of ESH for such "on demand updates" is the REFRESH command - when your handler receives this command, it should reach out to the device to get its current state and send an update.

Through this mechanism, you can add a "refresh" button in your UI to manually trigger the refresh of the values. Or you can create a rule that refreshes it every 2 seconds until you deactivate the rule again. Or you have an external system sending a REFRESH command, because it needs the latest state.

Hope this helps!
Kai

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