@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<ObjectIdentifier> sOis = (SequenceOf<ObjectIdentifier>) rpa.getValue(); List<ObjectIdentifier> ois = new ArrayList<ObjectIdentifier>(); for (ObjectIdentifier oi : sOis) { System.out.println("--> " + 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<...>.

In the end I created a server (which runs in the computer that's locally placed in my network) and then communicate via socket.

Until I found out how implement a RemoteDevice that you said, thanks mlohbihler.

Thanks very much Valter.

sorry taking so long to reply friend. (I was involved in another project, but now returning to bacnet4j )

I try what you suggest but it just told me the value of the binary and the analog, which is :

Object type || value
Device : 8
Analog Value : 2
Binary Value : 5

What I need is a little more specific, how to know the int value of a binary input for example ?

@Valter Henrique said:

Hi everyone,

i need to read the values of my objects, i only can read the instance number:

private static void getObjectList(LocalDevice localDevice, String ip, int port, int deviceId, float value) throws Exception { InetSocketAddress addr = new InetSocketAddress(InetAddress.getByName(ip), port); ReadPropertyRequest read = new ReadPropertyRequest(new ObjectIdentifier(ObjectType.device, deviceId), PropertyIdentifier.objectList); ReadPropertyAck ack = (ReadPropertyAck) localDevice.send(addr, null, 1476, Segmentation.segmentedBoth, read); System.out.println("IP: " + ip); SequenceOf<ObjectIdentifier> oids = (SequenceOf<ObjectIdentifier>) ack.getValue(); int i = 0; for (ObjectIdentifier oid : oids) { System.out.println("-------- " + oid.getInstanceNumber()); } }

But how read the value of each object ?
For example, i would like to read '15' from my analog output object, o true or false from my digital values and go on.
image

I try to write this code:

InetSocketAddress addr = new InetSocketAddress(InetAddress.getByName(ip), port); ReadPropertyRequest read = new ReadPropertyRequest(new ObjectIdentifier(ObjectType.analogOutput, deviceId), PropertyIdentifier.priorityArray); ReadPropertyAck ack = (ReadPropertyAck) localDevice.send(addr, null, 1476, Segmentation.segmentedBoth, read); PriorityArray priorityArray = (PriorityArray) ack.getValue(); float priority = priorityArray.get(16).getRealValue().floatValue(); System.out.println("priorityArray = " + priority);

But is not working.

Could anyone help me with this please ?

Best regards,
Valter Henrique.

Hi, someone could help me with this please ?

mlohbihler , could you help me, please ?

Thanks in advance.

@mlohbihler, i follow your suggestion and happens what you say, no remote devices responds.
I think in my case is just local devices .
Well, this is my code if could help anyone:

/* Copyright (C) 2006-2009 Serotonin Software Technologies Inc. @author Matthew Lohbihler */ package com.bacnet.ready; import com.serotonin.bacnet4j.LocalDevice; import com.serotonin.bacnet4j.RemoteDevice; import com.serotonin.bacnet4j.RemoteObject; import com.serotonin.bacnet4j.service.acknowledgement.ReadPropertyAck; import com.serotonin.bacnet4j.service.confirmed.ReadPropertyRequest; import com.serotonin.bacnet4j.service.confirmed.WritePropertyRequest; import com.serotonin.bacnet4j.service.unconfirmed.WhoHasRequest; import com.serotonin.bacnet4j.service.unconfirmed.WhoIsRequest; import com.serotonin.bacnet4j.type.Encodable; import com.serotonin.bacnet4j.type.enumerated.PropertyIdentifier; import com.serotonin.bacnet4j.type.primitive.CharacterString; import com.serotonin.bacnet4j.type.primitive.Null; import com.serotonin.bacnet4j.type.primitive.Real; import com.serotonin.bacnet4j.type.primitive.UnsignedInteger; /** * @author Matthew Lohbihler */ public class CommandPriorityTest { private static LocalDevice localDevice; private static RemoteDevice remoteDevice; private static RemoteObject remoteObject; public static void main(String[] args) throws Exception { String objectName = "Command Priority Test"; localDevice = new LocalDevice(101, "192.168.1.255"); localDevice.initialize(); // Who is localDevice.sendBroadcast(47808, null, new WhoIsRequest()); Thread.sleep(1000); // Who has localDevice.sendBroadcast(47808, null, new WhoHasRequest(null, new CharacterString(objectName))); // Wait a bit for responses to come in. Thread.sleep(1000); // Find the device if (localDevice.getRemoteDevices().isEmpty()) { System.out.println("No devices responded"); } else { remoteDevice = localDevice.getRemoteDevices().get(0); // localDevice.getExtendedDeviceInformation(remoteDevice); // List<ObjectIdentifier> oids = ((SequenceOf<ObjectIdentifier>)localDevice.sendReadPropertyAllowNull( // remoteDevice, remoteDevice.getObjectIdentifier(), PropertyIdentifier.objectList)).getValues(); // for () // remoteDevice.setObject(new RemoteObject()) // Find the object. for (RemoteObject o : remoteDevice.getObjects()) { if (o.getObjectName().equals(objectName)) { remoteObject = o; break; } } getPresentValue(); getPriorityArray(); setPresentValue(new Real(16), 16); getPresentValue(); getPriorityArray(); setPresentValue(new Real(15), 15); getPresentValue(); getPriorityArray(); setPresentValue(new Null(), 16); getPresentValue(); getPriorityArray(); setPresentValue(new Real(16), 16); getPresentValue(); getPriorityArray(); setPresentValue(new Real(10), 10); getPresentValue(); getPriorityArray(); setPresentValue(new Null(), 10); getPresentValue(); getPriorityArray(); setPresentValue(new Null(), 15); getPresentValue(); getPriorityArray(); setPresentValue(new Null(), 16); getPresentValue(); getPriorityArray(); } localDevice.terminate(); } private static void getPresentValue() throws Exception { ReadPropertyRequest rpr = new ReadPropertyRequest(remoteObject.getObjectIdentifier(), PropertyIdentifier.presentValue); ReadPropertyAck ack = (ReadPropertyAck) localDevice.send(remoteDevice, rpr); System.out.println("Present value: " + ack.getValue()); } private static void getPriorityArray() throws Exception { ReadPropertyRequest rpr = new ReadPropertyRequest(remoteObject.getObjectIdentifier(), PropertyIdentifier.priorityArray); ReadPropertyAck ack = (ReadPropertyAck) localDevice.send(remoteDevice, rpr); System.out.println("Priority array: " + ack.getValue()); } private static void setPresentValue(Encodable value, int priority) throws Exception { WritePropertyRequest wpr = new WritePropertyRequest(remoteObject.getObjectIdentifier(), PropertyIdentifier.presentValue, null, value, new UnsignedInteger(priority)); localDevice.send(remoteDevice, wpr); } }

Thanks for your code

Actually I need to understand the classes of Bacnet4j..

I am seeing bacnet packages in Wireshark when I sent bacnet packets from Virtual Test Shell. ..

What must I write the argument of LocalDevice class to capture these package in Bacnet4j lib in java? WireShark and VTS is in my local computer so do I must write localhost in LocalDevice as a argument?

All I want is to manage and control the bacnet device from Bacnet4j lib ...

I am beginner of these library and there is no document to study on, so I need to understand and learn what it is going on..

Serotonin has done multiple projects building access to specific devices, including various models of the FX. Web services are a relatively straightforward way of exchanging information. I recommend using M2M2 so that a specific data source module can be built for your purposes.