Not getting devices after bacnet.discover

[pisuke]

Hi,

I'm trying to use the code in the develop branch and master branch. In both cases, when I try the following code:

import BAC0

bacnet = BAC0.connect() 
bacnet.discover()

print(bacnet.devices)
for bacnet_device in bacnet.devices:
    print(bacnet_device)

I get an empty Pandas dataframe in the bacnet.devices object.

This is the output of my script:

2022-03-18 15:34:29,947 - INFO    | Starting BAC0 version 22.01.06dev (Complete)
2022-03-18 15:34:29,947 - INFO    | Use BAC0.log_level to adjust verbosity of the app.
2022-03-18 15:34:29,947 - INFO    | Ex. BAC0.log_level('silence') or BAC0.log_level('error')
2022-03-18 15:34:29,947 - INFO    | Starting TaskManager
2022-03-18 15:34:29,949 - INFO    | Using ip : 192.168.1.148
2022-03-18 15:34:29,961 - INFO    | Starting app...
2022-03-18 15:34:29,961 - INFO    | BAC0 started
2022-03-18 15:34:29,961 - INFO    | Registered as Simple BACnet/IP App
2022-03-18 15:34:29,964 - INFO    | Update Local COV Task started
2022-03-18 15:34:31,114 - INFO    | Server started : http://192.168.1.148:8111
 * Serving Flask app 'BAC0.web.FlaskServer' (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on all addresses.
   WARNING: This is a development server. Do not use it in a production deployment.
 * Running on http://192.168.1.148:8111/ (Press CTRL+C to quit)
2022-03-18 15:34:35,120 - INFO    | Found those networks : set()
2022-03-18 15:34:35,121 - INFO    | No BACnet network found, attempting a simple whois using provided device instances limits (0 - 4194303)
2022-03-18 15:34:42,126 - INFO    | Found those networks : set()
2022-03-18 15:34:42,127 - INFO    | No BACnet network found, attempting a simple whois using provided device instances limits (0 - 4194303)
Empty DataFrame
Columns: [Manufacturer, Address,  Device ID]
Index: []
Manufacturer
Address
 Device ID

A Wireshark capture show this:

2945    4.231313538 0.012400963 192.168.1.148   192.168.1.255   BACnet-APDU 67  Unconfirmed-REQ i-Am device,3057154 
2946    4.231426334 0.000112796 192.168.1.148   192.168.1.255   BACnet-APDU 67  Unconfirmed-REQ i-Am device,3057154 
3572    5.363605458 0.004860897 192.168.1.148   192.168.1.255   BACnet-NPDU 60  What-Is-Networknumber
3573    5.364709541 0.001104083 192.168.1.173   192.168.1.255   BACnet-NPDU 60  Networknumber-Is
5174    8.588284120 0.000449394 DeltaCon_10:38:7b   Broadcast   BACnet-APDU 60  Unconfirmed-REQ who-Is 3057154 3057154 
5175    8.588568938 0.000284818 192.168.1.173   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ who-Is 3057154 3057154 
6841    11.095690918    0.001657300 192.168.1.148   192.168.1.255   BACnet-APDU 60  Unconfirmed-REQ who-Is 0 4194303 
6842    11.096818978    0.001128060 192.168.1.173   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ i-Am device,4114459 
6843    11.097114914    0.000295936 192.168.1.127   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ i-Am device,1 
6844    11.101085151    0.003970237 192.168.1.141   192.168.1.255   BACnet-APDU 67  Unconfirmed-REQ i-Am device,1141 
7798    14.473124384    0.000048215 192.168.1.148   192.168.1.255   BACnet-NPDU 60  Who-Is-Router-To-Network
8023    15.603997890    0.005779054 DeltaCon_10:38:7b   Broadcast   BACnet-APDU 60  Unconfirmed-REQ who-Is 3057154 3057154 
8024    15.604290081    0.000292191 192.168.1.173   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ who-Is 3057154 3057154 
8352    16.464542572    0.013012814 192.168.1.148   192.168.1.255   BACnet-APDU 60  Unconfirmed-REQ who-Is 0 4194303 
8353    16.465918531    0.001375959 192.168.1.127   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ i-Am device,1 
8354    16.466363238    0.000444707 192.168.1.173   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ i-Am device,4114459 
8355    16.470363488    0.004000250 192.168.1.141   192.168.1.255   BACnet-APDU 67  Unconfirmed-REQ i-Am device,1141 
10075   22.614176006    0.000002617 DeltaCon_10:38:7b   Broadcast   BACnet-APDU 60  Unconfirmed-REQ who-Is 3057154 3057154 
10076   22.614337743    0.000161737 192.168.1.173   192.168.1.255   BACnet-APDU 62  Unconfirmed-REQ who-Is 3057154 3057154 

So I can see that devices in the network are responding. What could be the issue preventing devices to be captured by BAC0? Or am I using the library wrongly?

If I run a YABE BACnet scan, I can see the devices and their objects/points correctly.

[pisuke]

I've checked the same code on a windows machine and it finds the devices after a discover, while it doesn't on my mac and linux boxes. Is there anyone using BAC0 on linux or mac who has experienced a similar behaviour?

[ChristianTremblay]

Can you try specify the subnet when you define your bacnet network ? (ex. ip/24) I know there are some little nuances between Windows & Mac & Linux and BACnet discovery is highly tied to the subnet and broadcast address.

[gnmerritt]

Another thing you might try is running a bacnet.whois() after your discovery call. We've found that the separate code path sometimes picks up devices that bacnet.discover() misses

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