Thank you for writing on PI Square .
It looks like this questions is more programming oriented. This questions are normally answer by our PI Developers Club team.
Normally you would create an exception in order to alert you that there is a Network Time out. I found in the other hand a known issue that implies that AFDataPipe and PIDataPipe do not return errors collection on GetObserverEvents call.
I am going to double check with the developer team in order to see if this known issue is still pending.
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The error should be returned in the errors collection returned by GetObserverEvents. It is not in your case due to bug 109622 that was resolved in AF Client 2016 R2 (2.8.6).
Thank you guys, that is exactly what I was looking for.