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Hi davyv,

Someone referenced this in another thread and so I thought I'd answer, even though it has been a very long time.

My suspicion is that you're not seeing or the devices aren't sending the IAmRouterToNetwork messages. Most likely this has to do with them going to broadcast addresses and your having bound a specific address. So, the operating system may not be delivering those broadcasts to your LocalDevice. You could try binding the address 0.0.0.0 or just zeros in the subnet bits, like 192.168.0.0

Hi gquiroz, no need to post it twice.

That would suggest to me that the local network number of your configured local device (/system_settings.shtm BACnet Local Devices section) is not 42, and so when the local device wishes to send a message to network 42, it doesn't believe that's the network that it is on, so it looks to see if another device has let the network know that IAmRouterToNetwork 42, which it doesn't find as having happened.

What is the local device's network number set to (and it's bind address while we're at it)? Have you tried setting it to 42? When you use the discovery tool, do you find the devices you're expecting?

For posterity: another solution was proposed to add more network addresses to the adapter (which both Windows and Linux support), such that they could bind that address and the standard port.

Hi Joshua,

It should mostly be managed for you, but you'll probably not get a definite answer to this open-ended question, as the original author of BACnet4J hasn't posted on the forum in quite a while.

I know a significant part of its use it to ensure a device configured expecting to be able to find a remote device doesn't flood the network trying to discover it over and over again (assuming the remote device isn't responding).

But, you'd have to see how it's used to see the purpose of its design. I wouldn't expect a complete set of declarative sentences to avail itself.

@phildunlap Perfect, thank you. Not sure how I missed that file before, but it will be extremely useful in the future.

Cheers!

Hi carnecro,

Not that I'm aware of. Are you defined custom objects or just properties? I think (and I haven't tried it so I'm not sure) that adding your Objects into com.serotonin.bacnet4j.type.enumerated.ObjectType , your properties into com.serotonin.bacnet4j.type.enumerated.PropertyIdentifier , and their relationship with each other and transmittable data types into com.serotonin.bacnet4j.obj.ObjectProperties you will be well on the way. I didn't see any obvious ways for runtime modification of these mostly static classes and their relationships.

Certainly! Thanks for sharing the resolution!

Sure. I meant that as an aside to anyone who may stumble onto this thread and was in need of something like connecting a mstp network and an ip network; to say there is not to my knowledge any prebuilt MSTP-IP converter functionality in the LocalDevice code. Could also have been a useful inclusion if I didn't fully understand your ambition. The sentence does being with 'if' :D

It's operating system dependent. As you observed Windows worked with the exact address bound, but Linux did not. I would suspect you could make Linux work with the exact address bound too, if you configure its receiving of the broadcasts. Those are the only three options that really make sense to try, so it's usually not a big deal to do trial and error.

Do you mean WhoIsRequest? You could elect to send another WhoIs in certain situations (such as not finding all the devices you expect, on a timer, etc) but you'll note that the LocalDevice::getRemoteDevice method calls RemoteDeviceFinder.findDevice (at least in the most recent version of it) which will specifically send the WhoIs for that device. Recall that there is the device cache in the local device to prevent retrying device resolution over and over rapidly if a device isn't found.

Then you should be able to drop a breakpoint in the ServiceFutureImpl method and see where that BACnet timeout exception is coming from.

But result is same.

Does it at least take longer to timeout? I do not believe the actual sending of the property request is present in the code you have shared. Nor is the configuration of the local device there. That's not a lot of information to work with.

Thank you.
But the content of the link says it relates java option matter, it seems doubtful a little for me about it.
I'll try it anyway.

Thank you for your answering.
I realized that instaceId == deviceId ,later.
I could do what I want as below.
RemoteDeviceFuture dd = localDevice.getRemoteDevice(instaceId );
RemoteDevice d = dd.get();
The bug what I got seems being resolved with getRemoteDevice() of Bacnet4J 4.X.
thank you.

@ssimm This is a limitation of the BACnet protocol. All devices must be on the same UDP port (47808 default).

I manually downloaded all the missing jars from the repo you provided and it seems to be working now apart from

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".

But I get no exceptions when calling

dev.initialize();

Thanks for the help.

Hi Gonzalo, welcome to the forum!

I'm not sure what you mean. There is a jar in any Mango BACnet module in its lib directory. Perhaps you are asking about the releases here? https://github.com/infiniteautomation/BACnet4J/releases

No, there doesn't appear to be a jar file linked in that release, you would have to build it yourself. Our build system doesn't trigger BACnet4J builds automatically, but I just hit the build button on the current state of the repo: https://maven.mangoautomation.net/#browse/browse/assets:ias-snapshot:9238f1f3c81af9d8ce43f83c0a18ec70

Thank you for the reply. But still i have some unresolved questions.

My objective is to get bacnet devices list in a network and to get the objects and its properties. Which file should i run in the Bacnet4J library to get these results? Is there any test file available in the library to get this?
Your help is highly appreciated since there is no help available on internet

Hello Phildunlap,

Thank you very much for your quick response. Much appreciated !!

I got your point, will check on those two APIs over this weekend and let you know whether I'm able to find a solution.

Thank you very much.
Manoj

The Timer in LocalDevice which handles the COV tasks and whatnot is created without a minimum pool size and with Integer.MAX_VALUE as the upper bound.

The "withLocalNetworkNumber" function, https://github.com/infiniteautomation/BACnet4J/blob/master/src/main/java/com/serotonin/bacnet4j/npdu/ip/IpNetworkBuilder.java