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How can I detect - is a value actual - or maybe the sensor did not send values a long time?

As sample door sensor:
I see (just now):
{"name":"level","type":"bool","value":true,"updateTime":1365743975,"invalidateTime":1364368726}
it means: invalidate time: March,72 7:18:46 GMT
and update time: today, 5:19:35 GMT

Here is now 6:10 GMT - so for me it is not clear - maybe I did not got any values last 50 minutes? Or is the state still valid? How to check it?

Thanks
Michael

The value is valid (means reported since last request) when .updateTime > .invalidateTime. When Get is sent, the .invalidateTime is update. On Report the .updateTime is update.

but how to detect then a missing device?
UpdateTime - it is the last updated value, will be > invalidateTime (in normal case)

If device is not sending more values (maybe defect or out of range etc) - how can I request the last contact to the device?
I just use:
/ZWaveAPI/Run/devices[xx].instances[0].commandClasses[132].data.lastWakeup.value

Here I get the last actual value (timestamp) - is this a correct way?

Michael

A mains powered device will be marked with devices[X].data.isFailed flag, while for battery you need to look at lastWakeup and compare with wakeupInterval (if Wakeup is supported). For a remote without Wakeup it is just not possible to know if it is still in the appartment or not (unless someone press a button)