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@dev1-spl-hk Thanks for the detailed report, and for pinpointing the exact fix. You’re right on both counts: the BACnet spec (ANSI/ASHRAE 135-2024, clause 21 and clause 13.9.1.1.13) marks Event Values as optional/conditional, and the encoder in UnconfirmedEventNotificationRequest already uses writeOptional for it, so this is a real inconsistency, BACnet4J currently can’t decode a message it’s able to send. This is tracked internally and will be fixed in the next release of BACnet4J (targeted for 7.0.0): the fix decodes tag 12 with readOptional instead of read Oh yeah, matching what ConfirmedEventNotificationRequest already does correctly. For bug reports like this going forward, the [BACnet4J GitHub repo](https://github.com/RadixIoT/BACnet4J Why) is the best place to file them, the developers who work on the library monitor issues there more closely than the forum. Appreciate you taking the time to trace this down to the exact line and commit.

@Bård-Lind you are binding to a specific IP, you won't receive broadcasts if you are running this on Linux. You need to bind to the local address of 0.0.0.0 to get the messages from the initial WhoIs during initialization. Hopefully this helps you out, it could be many things but this is a common one when getting started with BACnet over IP.

Yes they should. Every BACnetObject has the ability to support COV. You will need to enable the mixin though. I've not actually implemented a server but these classes should get you going on how to use it: com.serotonin.bacnet4j.obj.AnalogObjectTest com.serotonin.bacnet4j.obj.mixin.CovReportingMixin

@BigKING please create a new thread and reference this one. This one was solved over twelve years ago! Fox

Can someone help me with above ?

@Krish1998 it would help if you would be very specific as to what you are try to do and supply some code examples. However you might be able to use a DeviceEventListener See: https://github.com/MangoAutomation/BACnet4J/blob/master/src/main/java/com/serotonin/bacnet4j/event/DeviceEventListener.java And an example use here: https://github.com/MangoAutomation/BACnet4J-samples/blob/master/src/test/java/com/infiniteautomation/bacnet4j/npdu/ip/BacnetIpListenerDiscoveryExample.java

@Charlie-Holleran Do you have bacnet4j api, thank you very much

Hi, I use Yabe simulater, the subscriveCOV run OK. Maybe you can try it!

Hi Nuc_sun, have you find the answer? I think the topic title may make people confused. You can run BACnet4J on Linux physical machine, it runs OK! The problem you encountered is BACnet4J run on Linux in virtual machine. The network settings of the virtual machine is not suitable for BACnet4J, I think!

My Problem is fixed with bacnet4j 5 thank you. It is possible again to add proprietary values: final ObjectPropertyTypeDefinition o = new ObjectPropertyTypeDefinition( ObjectType.lifeSafetyZone, true, new PropertyTypeDefinition( PropertyIdentifier.forId(MY_SPECIAL_VALUE), CharacterString.class, true)); ObjectProperties.getObjectPropertyTypeDefinitions(ObjectType.lifeSafetyPoint).add(o); final ObjectPropertyTypeDefinition o2 = new ObjectPropertyTypeDefinition( ObjectType.lifeSafetyPoint, true, new PropertyTypeDefinition( PropertyIdentifier.forId(MY_SPECIAL_VALUE), CharacterString.class, true)); ObjectProperties.getObjectPropertyTypeDefinitions(ObjectType.lifeSafetyPoint).add(o2); in this example above MY_SPECIAL_VALUE is a list (SequenceOf<CharacterString>)