MartIn 

i´d like to observe a device, only if a parameter changes i should be notified what parameter it is and the value.

Hi, 
i´d like to observe a device, only if a parameter changes i should be notified what parameter it is and the value.

What would be the call for this? 

Any help is much apreciated!

Hi, 
i´d like to observe a device, only if a parameter changes i should be notified what parameter it is and the value.
What would be the ca

observe device for parameter change?