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Displays the time passed in hours when an item last received an update, it slowly goes to red when time increases. Usefull when using battery operated Zwave/Zigbee devices, those could die/drop of the network without you noticing. You cannot set the indicator directory to the item, you need to create a monitor rule for each device you wish to monitor. The rule updates a datetime item reflecting the last updated time of the monitored item.

• The widget json file: Last update indicator.widget.json
• The javascript file: lastupdate-indicator.controller.js

• You need to create a _lastUpdate item of type datetime for each device/item you want to monitor.
• For each, create a rule which updates the _lastUpdate item to the last date it receved an update.

This is an example for an battery operated Zwave smoke detector, but it shows the base princaple.

zwave.items

DateTime Zwave_Rookmelder_Gang_LastUpdate           "Laatst gezien [%1$ta %1$tR]"           <clock> (gZwave)

zwave.rules

rule "Rookmelder gang"
when
	Item Zwave_Rookmelder_Gang changed or 
	Item Zwave_Rookmelder_Gang_Battery changed or 
	Thing "zwave:device:a5062334:node2" received update
then
	Zwave_Rookmelder_Gang_LastUpdate.postUpdate(new DateTimeType())
end

With this example, suggested by microneer, you can combine all devices in just one rule. Create a DateTime item per device with the trailing _LUD suffix.

// This Rule triggers when any Item in the gRecordLastUpdate Group is updated, and
// updates a virtual DateTime item with the same name as the Item but with _LUD as 
// a suffix, setting it to the current date and time.
rule "Record Last Update"
when
	Member of gRecordLastUpdate received update
then
	// Post an update to the item with the same name and _LUD suffix
 	sendCommand( triggeringItem.name+"_LUD", now.toString)
//	logInfo('lastUpdate', triggerItem.name)
end

• Create a folder within '/conf/html/' folder, name it 'lastupdate-indicator'.
• Place the 'lastupdate-indicator.controller.js' file in the '/conf/html/lastupdate-indicator/' folder.
• Import the downloaded Last update indicator.widget.json widget to your HABpanel.
• Add the widget to a dashboard, open the settings.
  • Select the _lastUpdate item.
  • Set the desired name which will be displayed in the widget.
  • Enjoy en drop me a like here on the Openhab cummunity forum.

The complete structure would look like this:

• /conf/html
  • /lastupdate-indicator
    • lastupdate-indicator.controller.js

If you need any help, use this topic on the Openhab community forum.

For issues and feature requests, please use the Issues module on Github.