State change timestamps

Setup, Configuration and Use Beginners
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1

Hi,

I’ve just setup my first MQTT binding where I have an item that receives an MQTT message on each change of temperature from a device. This is working fine. I also want to display the last time an update was received. Do I need another item for this or is this available as metadata on the existing item?

Thanks

2

I a not the brightest when it comes to OH…
However, I use rules for last update like so:

// ----- 170309 MaxG; save last date of Internet going down
rule "Update last update datum for WAN IP address"
  when
    Item nw_Internet changed from ON to OFF
  then
    INET_IP_LastUpdated.postUpdate(new DateTimeType())
end
3

Thanks, so is INET_IP_LastUpdated an item?

4

Yes, specifically for showing the date on the sitemap…

String   INET_IP_LastUpdated	"Internet offline since [%1$td/%1$tm %1$tH:%1$tM]"	<calendar>

Which in my case is only shown when the Internet is down:

    Text   item=INET_IP_LastUpdated		labelcolor=["red"]        valuecolor=["red"]        visibility=[nw_Internet=="OFF"]
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