Seemingly no router added with IP2VLANRouter.py

[damienpicard]

I'm using following sample code to generate a test set-up: python samples\IP2VLANRouter.py 10.34.xxx.xxx:47809 10 20 --count 5.

While 5 objects are created (I can see them using DeviceDiscoveryForeign, I do not manage to call them using ReadProperty.py:

> read 20:2 device:2002 objectName
noResponse
> rtn 10:10.34.xxx.xxx 20
> read 20:2 device:2002 objectName
noResponse

Could it be that no router have been added?

C:\work\python\bacpypes>python samples\WhoIsRouter.py --ini BACpypes.ini
> wirtn *
> exit

I have used ed68c57 from the stage branch.

[JoelBender]

You are running the IP2VLANRouter.py application without specifying a subnet size so the application has no idea what it should listen to for broadcast messages. Try running it with 10.34.xxx.xxx/16:47809 and if you run netstat --udp -a -n and you'll see two sockets open, one is 10.34.xxx.xxx:47809 for inbound and outbound unicast traffic and another is 10.34.255.255:47809 listening for broadcast traffic.

When you are running the WhoIsRouter.py application you are probably using the "normal" BACnet port 47808, so you two have two more sockets open, 10.34.xxx.xxx:47808 and 10.34.255.255:47808. Your local broadcast request for Who-Is-Router-To-Network is being sent from 10.34.xxx.xxx:47808 to 10.34.255.255:47808, so it won't be received by the router because the port is different.

Try wirtn 10.34.xxx.xxx:47809, sending a unicast message directly to the router and you should get a response.

Next, with the ReadProperty.py application, tell the network layer the address of the router to network 20 with the command rtn 10.34.xxx.xxx:47809 20. Then the application won't try to hunt for it, and the read requests will be successful.

[damienpicard]

Wonderful, it works. Thank you very much!

The only pity is that the device does not allow me to write a value on analogValue:1 and that the device does not have a priorityArray. I can thus not check my whole code.

[JoelBender]

I can clone that application to make the point writable and/or commandable, support COV notifications, etc., let me know. The point of this particular sample is to present a little bit of how a gateway application from BACnet/IP to some other protocol that supports multiple devices (maybe a master/slave protocol like MODBUS) can present each of those as virtual BACnet devices.

[damienpicard]

Hi Joel,

if you could add the following items such that I can automate the testing of my code it would be very helpful. I tried to do it myself but so far without success.

• Different types of devices: binaryOutput, binaryInput, analogOutput, analogInput, analogValue,
• write and read access with priorityArrays
• (optional as I don't use that yet) COV

Thank you very much in advance!