If the Bacnet console asks for information that is larger than the frame size, Transport->sendResponse() will use network->sendSegmented instead of network->sendAPDU. sendAPDU works great but sendSegmented is having problems with keys in the waiting room. When it sends the first segment Transport->sendSegments always comes back with a null response. This is causing a lot of hangs in the console as it waits for information. The console appears to be sending the correct response based on Wireshark.

If the Bacnet console asks for information that is larger than the frame size, Transport->sendResponse() will use network->sendSegmented instead of network->sendAPDU. sendAPDU works great but sendSegmented is having problems with keys in the waiting room. When it sends the first segment Transport->sendSegments always comes back with a null response. This is causing a lot of hangs in the console as it waits for information. The console appears to be sending the correct response based on Wireshark.

Can you set it in your bootup scripts? If on linux you can put it either in the system startup or in the service script.

At the moment that is the big hammer approach. I am experimenting with setting up a virtual network on the linux system just for the bacnet devices. I will let you know how that goes. The ifconfig and ip commands can do the same things. the ip command can do more but for this application ifconfig is just fine. I am going to start a blog of my experiences and give some same code once I get this thing working (just about ready).
Scott

I could never get the slave device test to work. The only way this has worked is when the port numbers are identical. This is why using the virtual interfaces was critical. You can set the port to 47808 for all of them.

I am a linux guy but found this: http://www.sevenforums.com/network-sharing/3156-adding-virtual-network-adapter.html
Good luck!

Thanks! I was just pulling my hair out on a similar problem.

The 02: etc on the mac address has been kindly replaced with smiley faces. 02 colon hex hex colon .....

I was pretty successful when I used virtual interfaces bound to the main interface. I have to track which device is bound to what address and have to use a virtual mac address when I configure it. Using 02:xx:xx:xx:xx:xx is okay as the 02 is for "local" unregistered mac addresses. I track the mac and ip address of the interface and which device is attached. On a linux system I use the ip command to configure the interfaces on startup. Let me know if you need more info.
Scott

I have tried to fix the error I have with using multiple ip addresses which works fine as long as they are on the same subnet as the Bacnet Console. I also am trying to use the same method as the "SlaveDevice.java" test file. There are several problems with this, the first of which is it fails with:
Apr 01, 2014 10:49:12 AM com.serotonin.bacnet4j.service.unconfirmed.IAmRequest handle
WARNING: Another instance with my device instance ID found!
Apr 01, 2014 10:49:12 AM com.serotonin.bacnet4j.service.unconfirmed.IAmRequest handle
WARNING: Another instance with my device instance ID found!

Repeated twice when I send the IAm messages. Any ideas? This is a direct copy of the original source file I am using.
Scott