Issue Accessing / retrieving data from visible device

[bdesalle]

Hi,

I am having trouble accessing device that is well discovered due to no network ID.

Overview of the infrastructure: I have

• a VM running on network 10.22.81.100/24 using Python 3.11.9 and BAC0 23.07.03
• a device on network 10.22.81.119/24

My first goal is simply to access the device at 10.22.81.119 and read a data. Unfortunately I a stuck due to no BACnet network found.

My code:

import BAC0

myIPAddr = '10.22.81.100/24' bacnet = BAC0.connect(ip = myIPAddr) _2024-07-10 14:15:47,441 - INFO | Starting BAC0 version 23.07.03 (Lite) 2024-07-10 14:15:47,442 - INFO | Use BAC0.log_level to adjust verbosity of the app. 2024-07-10 14:15:47,442 - INFO | Ex. BAC0.log_level('silence') or BAC0.loglevel('error') 2024-07-10 14:15:47,442 - INFO | Starting TaskManager 2024-07-10 14:15:47,443 - INFO | Using ip : 10.22.81.100 on port 47808 | broadcast : 10.22.81.255 2024-07-10 14:15:47,457 - INFO | Starting app... 2024-07-10 14:15:47,458 - INFO | BAC0 started 2024-07-10 14:15:47,458 - INFO | Registered as Simple BACnet/IP App 2024-07-10 14:15:47,458 - INFO | Device instance (id) : 3056183 2024-07-10 14:15:47,459 - INFO | Update Local COV Task started (required to support COV) bacnet.whois() [('10.22.81.119', 99)] bacnet.devices [('Canalis 11A', 'Universal Electric Corporation', '10.22.81.119', 99)] bacnet.what_is_network_number() No data bacnet.discover() 2024-07-10 14:18:47,940 - INFO | Found those networks : set() 2024-07-10 14:18:47,941 - INFO | No BACnet network found, attempting a simple whois using provided device instances limits (0 - 4194303) [('10.22.81.119', 99)]

Your help is appreciated, I know I am missing something but for the love of god cannot find what.

Thanks,

[ChristianTremblay]

try to define the device directly :

import BAC0

myIPAddr = '10.22.81.100/24'
bacnet = BAC0.connect(ip = myIPAddr)
BAC0.device('10.22.81.119', 99, bacnet)

[bdesalle]

Hi,

Thanks, it helped but now it crashes trying to build the point list

BAC0.device('10.22.81.120', 99, bacnet) 2024-07-15 19:32:04,978 - INFO | Changing device state to DeviceDisconnected'> 2024-07-15 19:32:04,985 - INFO | Changing device state to RPDeviceConnected'> 2024-07-15 19:32:04,994 - INFO | Device 99:[Canalis 11A] found... building points list 2024-07-15 19:32:06,700 - WARNING | The description property is not implemented in the device. Using a default value for internal needs. 2024-07-15 19:32:06,715 - WARNING | The description property is not implemented in the device. Using a default value for internal needs. 2024-07-15 19:32:06,730 - WARNING | The description property is not implemented in the device. Using a default value for internal needs. ..... .... .... Traceback (most recent call last): File "", line 1, in File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 195, in init self.new_state(DeviceDisconnected) File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 211, in new_state self._init_state() File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 857, in _init_state self.connect() File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 900, in connect self.new_state(RPDeviceConnected) File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 211, in new_state self._init_state() File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 454, in _init_state self._buildPointList() File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/Device.py", line 541, in _buildPointList ) = self._discoverPoints(self.custom_object_list) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/mixins/read_mixin.py", line 194, in _discoverPoints self._process_new_objects( File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/mixins/read_mixin.py", line 389, in _process_new_objects presentValue = self.read_single( ^^^^^^^^^^^^^^^^^ File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/devices/mixins/read_mixin.py", line 661, in read_single return self.properties.network.read( ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/root/.venv/python-3.11/lib/python3.11/site-packages/BAC0/core/io/Read.py", line 162, in read value = apdu.propertyValue.cast_out(datatype) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/root/.venv/python-3.11/lib/python3.11/site-packages/bacpypes/constructeddata.py", line 1346, in cast_out helper = klass(self.tagList[0]) ^^^^^^^^^^^^^^^^^^^^^^ File "/root/.venv/python-3.11/lib/python3.11/site-packages/bacpypes/primitivedata.py", line 1157, in init self.decode(arg) File "/root/.venv/python-3.11/lib/python3.11/site-packages/bacpypes/primitivedata.py", line 1238, in decode raise InvalidTag("enumerated application tag required") bacpypes.errors.InvalidTag: enumerated application tag required

[ChristianTremblay]

For old devices or devices that are not following all BACnet rules, you have to be selective....

You can read the object list property and keep only the ones you want to use.

https://bac0.readthedocs.io/en/latest/controller.html#object-list

You can also skip the "device"creation and use bacnet.read() or bacnet.write(). You will need to know the properties of the vlaues of interest.

[bdesalle]

Hi Christian,

Thanks a lot, I am now able to connect to the devices and read values.

One last issue, when I try to save the data, I get 2024-07-16 07:58:05,973 - ERROR | Pandas is required to save to SQLite. Even though pandas is available

bacnet.registered_devices [Canalis 11A / Connected, Canalis 14 / Connected] canalis11A.points [Canalis 11A/Infeed L1 Current : 41.01 amperes] canalis11A.save() 2024-07-16 08:08:29,899 - ERROR | Pandas is required to save to SQLite. df = pd.DataFrame({"Name":["Pierre","Paul"],"Age":[10,15],}) df Name Age 0 Pierre 10 1 Paul 15

[ChristianTremblay]

Sometimes, different versions of Python get mixed and we find missing packages...if pandas is installed in the same env than BAC0, I see no reason to trigger that exception

[bdesalle]

Thank you for your help, As this now turns into an environnment issue, I am closing this issue