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@Brad-Boutwell
Thank you for your help, everything worked out

Are you trying to modify the library or use Mango to interface with BACnet devices?

The method

covNotificationReceived(...)

in

com.serotonin.bacnet4j.event.DeviceEventLiistener

is fired on the client side when a BACnet client receives a value change from a BACnet server. What I need is the opposite - I need an event on the server side when a client starts to poll for a BACnetObject property (in my case the PresentValue). The proper place for a hook could be

BACnetObject.addCovSubscription() BACnetObject.removeCovSubscription()

or

CovReportingMixin.addCovSubscription() CovReportingMixin.removeCovSubscription()

Both are not easy to implement via subclassing (Bacnet4J library does not allow me to add my own MixIn, for example) so I ended by changing the original source code.

It looks like that old functionality has been taken a way where we used to get the linked service in IM requests.
With 3.2.3 the stack expect IM router to Network or I Coud be Router to Network to come in order to decide about network address (Linked Service) .
Im a bit surprise since we can get the linked service when getting the IAM and make use of it.
I have a temporary fixed but expect it to be fixed officially.

Does anyone has any idea?

Works with version commit 18b2b5531da1f436da50f73f44d9b3fb25522ed0 - 2015-12-17 01:10:43.
Note: I used this version since there were test errors in the JUnit tests in the latest one (commit 4a445c93356d8558988f270c3e7a97a85df28eef)

Sorry to answer so lately, I finally found back my login and password for this site.

Tank you Joolz, your comment helped me buld a schedule object. I'll try to paste a very basic example when I'll figure out how to put my code into code tag.