LabVIEW Idea Exchange
When performing a single point read on an XNet session, you will receive the value of the signal that was last read, or the Default value as defined by the database if it has never been read.
This type of functionality is sometimes useful, but more often I'm interesting in knowing what the last reading was, if the reading is relatively recent. The problem with the NI implementation is that you have no way of knowing (with this one session type) if the device is still broadcasting data or not. I think a useful property might be to have a way of specifying an amount of time, that a signal's value is still valid. If I haven't seen an update to a signal in 2 seconds for example, I can likely assume my device is no longer communicating and the reading I get back from the XNet read should return NaN.
I had a small discussion on this topic and posted a solution using an XY session type here, which demonstrates the functionality I am talking about. I'd like this to be built into the API.
