Reading BACnet devices via VPN #525

billybboy · 2025-02-10T07:49:36Z

billybboy
Feb 10, 2025

I'm new to this and currently struggling to read a BACnet device via VPN. I've been trying for days but haven't been able to discover any devices, even after reading the documentation. Now, I'm wondering whether the issue is caused by my unfamiliarity with the module or mistakes in the BACnet-related configuration (BACnet IP, network status, etc.).

The given BACnet information contains following fields:

IP Addr.: 192.168.130.11
Subnet Mask: 255.255.255.0
Network ID: 12200
BACnet Name: AS-P_1122000
Object ID: 1122000
Fields below are related to devices:
Point Item (DeviceTag, Description, Unit)
BACnet setting (Name, Type, ObjectID)
For example:
Point Item
Device Tag: AH-B2-1
Description: Temperature
Unit: Celsius
BACnet setting
Name: RmTmp
Type: analog-value
ObjectID: 5750

Here is my code and terminal output:

import BAC0
import asyncio

bbmdIP = '192.168.130.11'

async def read_bacnet_values():
    # Start BACnet
    bacnet = BAC0.start(bbmdAddress=bbmdIP, bbmdTTL=900)
    devices = await bacnet.who_is()
    print(devices)

if __name__ == "__main__":
    asyncio.run(read_bacnet_values())

[02/10/25 14:52:46] INFO     2025-02-10 14:52:46,749 - INFO    | Starting Asynchronous BAC0 version 2024.09.10 (Lite)                                                                                                 notes.py:267
                    INFO     2025-02-10 14:52:46,753 - INFO    | Using bacpypes3 version 0.0.98                                                                                                                       notes.py:267
                    INFO     2025-02-10 14:52:46,755 - INFO    | Use BAC0.log_level to adjust verbosity of the app.                                                                                                   notes.py:267
                    INFO     2025-02-10 14:52:46,756 - INFO    | Ex. BAC0.log_level('silence') or BAC0.log_level('error')                                                                                             notes.py:267
                    INFO     2025-02-10 14:52:46,892 - INFO    | Using ip : 192.168.1.18/32 on port 47808 | broadcast : 192.168.1.18                                                                                   Lite.py:164
[02/10/25 14:52:46] INFO     2025-02-10 14:52:46,951 - INFO    | Using default JSON configuration file                                                                                                                notes.py:267
                    INFO     2025-02-10 14:52:46,963 - INFO    | Registering as a foreign device to host 192.168.130.11 for 900 seconds                                                                                Base.py:241
                    INFO     2025-02-10 14:52:46,967 - INFO    | Registered as BACnet/IP App | mode foreign                                                                                                           notes.py:267
                    INFO     2025-02-10 14:52:46,971 - INFO    | Device instance (id) : 3056729                                                                                                                       notes.py:267
[02/10/25 14:52:46] INFO     2025-02-10 14:52:46,973 - INFO    | Installing recurring task Ping Task (id:2089785405968)                                                                                               notes.py:267
[]

My Questions:

1. Is my configuration correct?

I’m unsure where to correctly specify the BACnet IP address.

2. Is the given device information sufficient to read data?

I’ve checked the bacnet.read() method in the documentation bacnet.read('address object object_instance property'), but I'm unsure which fields should be used.

Thanks in advance!

ChristianTremblay · 2025-02-14T18:08:32Z

ChristianTremblay
Feb 14, 2025
Maintainer

Is 192.168.1.18/32 the address you get on the interface connected to the VPN ?
Is 192.168.130.11 a BBMD ? Or just a device ?

0 replies

billybboy · 2025-02-17T05:30:40Z

billybboy
Feb 17, 2025
Author

I was able to connect to the device and read values by using the VPN interface as the IP value in BAC0.start(), while 192.168.130.11 is just the device address. So this issue is now resolved!

Now, I’ve tried to read values using COV, following the approach described in the documentation. However, I encountered an error. Below is my code and a part of the terminal output:

address='192.168.130.11'
vpn_ip='192.168.130.153/24'
device_id=1122000
async def read_bacnet_values():
    bacnet = BAC0.start(ip=vpn_ip, deviceId=1122000)
    resp = await bacnet.cov(address)


if __name__ == "__main__":
    asyncio.run(read_bacnet_values())

Exception in callback IPv4DatagramServer.set_local_transport_protocol(<IPv4Address 192.168.130.153>)(<Task cancell...nit__.py:150>>)
handle: <Handle IPv4DatagramServer.set_local_transport_protocol(<IPv4Address 192.168.130.153>)(<Task cancell...nit__.py:150>>)>
Traceback (most recent call last):
  File "C:\Users\nadi\anaconda3\Lib\asyncio\runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "C:\Users\nadi\anaconda3\Lib\asyncio\runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\nadi\anaconda3\Lib\asyncio\base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "c:\Users\nadi\Desktop\test\baccov.py", line 14, in read_bacnet_values
    resp = await bacnet.cov(address)
                 ^^^^^^^^^^
AttributeError: 'Lite' object has no attribute 'cov'

Am i using cov incorrectly?

0 replies

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Reading BACnet devices via VPN #525

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billybboy Feb 10, 2025

My Questions:

1. Is my configuration correct?

2. Is the given device information sufficient to read data?

Replies: 2 comments

Uh oh!

ChristianTremblay Feb 14, 2025 Maintainer

Uh oh!

billybboy Feb 17, 2025 Author

billybboy
Feb 10, 2025

ChristianTremblay
Feb 14, 2025
Maintainer

billybboy
Feb 17, 2025
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