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Presumably yes, you can change the oid, although oids themselves are immutable.

Thank you.

Your post helped me.

Hi kishorev,

You seem to be using the bacnet4j api in a bit of a strange way. But I can see a few things that might help. First of all before you ask for the object list, you probably need to do a broadcast, simply so that the responding bacnet device knows you exist, otherwise I'm pretty sure it can't respond to you.

You can do it with a broadcast:

localDevice.sendBroadcast(47808, localDevice.getIAm());

Or you can send it a direct message, since you know who you are talking to:

localDevice.sendUnconfirmed(remoteDevice.getAddress(), null, localDevice.getIAm());

Then then other problem is the way you are getting the object list, you are really using internal API methods, you are much better off using:

List<ObjectIdentifier> oids = ((SequenceOf<ObjectIdentifier>) localDevice.sendReadPropertyAllowNull(remoteDevice, remoteDevice .getObjectIdentifier(), PropertyIdentifier.objectList)).getValues();

Where remoteDevice is an instance of a RemoteDevice, in your case:

Address address = new Address(null,BACnetUtils.dottedStringToBytes("192.168.1.3"),47808); RemoteDevice remoteDevice = localDevice.findRemoteDevice(address, null, deviceId);

Hello

Can you post any example to inspire other users?

Indeed. A fix has been checked in.

Add this line:

localDevice.addObject(o);

Hello,

You cant use the same code for different Manufactorers.

So I want to set up a Properties File from which you can get the correct and neccessary values to control a device.

so i have a map with

key: String (manufacturer)
value: Propertie

so i got maybe a file called: ManufacturerA.properties :

temperature_sensor= ???
open_window= ???

In another class i have some methods, for example: getTemperature(RemoteDevice d, String manufactorer)
so i send a ReadPropertyRequest in this method using the value of the entry of temperature_sensor, so that i can get the ObjectIdentifier from it

my question is: Do different manufacturers's devices only differ in ObjectIdentifier, or do they also differ in ObjectType or in a writePropertyRequest in

PropertyIdentifier propertyIdentifier,
UnsignedInteger propertyArrayIndex

( so i want to know what i have to write as value into the properties )

Good to know.

:wink:

I finally got it to work...

LocalDevice localDevice = new LocalDevice(1234, "10.0.0.255", "10.0.0.111");
localDevice.initialize();
localDevice.sendBroadcast(0xBAC0, new WhoIsRequest(null, null));
localDevice.getEventHandler().addListener((DeviceEventListener) new Listener());

I now successfully receive an "i am" from all the bacnet devices expected.

In the many of the test examples the LocalDevice constructor used was:

LocalDevice localDevice = new LocalDevice(1234, "10.0.0.255");

I was never able to get any of those examples to work using this form of the constructor. The javadoc offers no help so I have no idea what address it is trying to bind to when you don't specify an address. I would suggest the test examples use the other constructor. Will save newbies a lot of frustration.

Dan

Hello, I am trying to figure out how to use bacnet4j and this thread is helpful however I am still stuck on the various IP addresses and ports used? Can you explain the difference between resource.getString("localDeviceIP"), resource.getString("deviceIP") and resource.getString("port")? Thanks in advance.

It would be interesting to know how and why the device is formatting its response differently than expected. But as the software is right now, no, it won't accept that response.

Thank you for that answer, it will be a great help.

Hi;

I am trying Bacnet4j on linux. But when I created bacnet device The error occured. Message is below

java.lang.RuntimeException: java.net.SocketException: getifaddrs not supported
at com.serotonin.bacnet4j.LocalDevice.getAllLocalAddresses(LocalDevice.java:779)
at com.serotonin.bacnet4j.service.unconfirmed.IAmRequest.handle(IAmRequest.java:71)
at com.serotonin.bacnet4j.LocalDevice.handleUnconfirmedRequest(LocalDevice.java:733)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl$IncomingMessageExecutor.runImpl(IpMessageControl.java:555)
at com.serotonin.bacnet4j.npdu.ip.IpMessageControl$IncomingMessageExecutor.run(IpMessageControl.java:489)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketException: getifaddrs not supported
at java.net.VMNetworkInterface.getVMInterfaces(Native Method)
at java.net.NetworkInterface.getNetworkInterfaces(Unknown Source)
at com.serotonin.bacnet4j.LocalDevice.getAllLocalAddresses(LocalDevice.java:768)
...7 more

It seem the Operating system is not supported getifaddrs. But how can I do.

Thank you!

Hello!
I am developing an application with BACnet4J library. First of all, I am able capable of reading properties from a device. However, I would like to discover devices connected in the same network. That is to say, I do not know IP/port from other BACnet devices, but I really know that they exist. I am playing with ObjectType.device and PropertyIdentifier. I have included in my code the following lines:

lDevice.sendBroadcast(1476, null, new WhoIsRequest()); Thread.sleep(5000); for (RemoteDevice d : lDevice.getRemoteDevices()) { lDevice.getExtendedDeviceInformation(d); List<ObjectIdentifier> oids = ((SequenceOf<ObjectIdentifier>) lDevice.sendReadPropertyAllowNull(d, d.getObjectIdentifier(),PropertyIdentifier.objectList)).getValues(); PropertyReferences refs = new PropertyReferences(); for (ObjectIdentifier oid : oids) addPropertyReferences(refs, oid); PropertyValues pvs = lDevice.readProperties(d, refs); // pvs. System.out.println(pvs); System.out.println(d); } }

Someone could help me, please.
Thank you very much!
Kind regards!

Hi,

I am working on this problem of letting users acknowledge Alarm events.

So in BACnet4j, where is the Alarm Ack/UnAck status stored? And how should I go about doing this Acknowledgement ?

Thanks a bunch.

@mlohbihler said:

Use read property requests with the present value property identifier.

I did as you said :

public String getPresentValue(LocalDevice localDevice, ObjectIdentifier oid) throws Exception { ReadPropertyRequest rpr = new ReadPropertyRequest(oid, PropertyIdentifier.presentValue); ReadPropertyAck rpa = (ReadPropertyAck) localDevice.send(isa, null, 1476, Segmentation.segmentedReceive, rpr); SequenceOf&lt;ObjectIdentifier&gt; sOis = (SequenceOf&lt;ObjectIdentifier&gt;) rpa.getValue(); List&lt;ObjectIdentifier&gt; ois = new ArrayList&lt;ObjectIdentifier&gt;(); for (ObjectIdentifier oi : sOis) { System.out.println(&quot;--&gt; &quot; + oi.getObjectType().intValue()); } return rpa.getValue().toString(); }

But it gives this follow error:

java.lang.ClassCastException: com.serotonin.bacnet4j.type.primitive.Real cannot be cast to com.serotonin.bacnet4j.type.constructed.SequenceOf at brainset.bacnet4j.Supervisory.getPresentValue(Supervisory.java:123)

What I'm trying to do is scan my device and know what kind of points I have, if is a analog output, analog input, etc.
And store these points values in my List<...>.

It's just that the software will not accept a COV subscription request on its analogs.

Thanks,

The real-life analogy is, e.g. an outdoor temperature. You can only read it - you can't change it (realistically). In cases like this having a read-only type is appropriate.

Should BACnet client be BACNET server? I mean if program would not support I-Am and other BACnet services will other BACnet servers answer? Is it possible to have 2 BACnet devices with different UDP sockets on the same subnet and they will talk to each other?

Please, point to BACnet standard.

Thanks, Andrey.