OPCUA interface with HA using Asyncua module

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1

Hi all,

I have been working with the integration of various PLC to HA over OPC UA for the past few months. My initial approach was to develop a gateway which connect to the PLC over restful api. After a couple of integration, I found that it would be much benefitial to have a custom integration in HA for OPC UA.

I found an older project which uses the python-opcua, which is deprecated and decided to start a new integration using opcua-asyncio.

The project is currently in development and is per poll based. Asycua component. Follow the instruction shown in the README.md file to start using!

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2

Hello,

i got it to work as custom component but i get an error with version 2024.1

Logger: asyncua
Source: custom_components/asyncua/init.py:210
Integration: asyncua
First occurred: 9:05:47 AM (3 occurrences)
Last logged: 9:06:47 AM

Runtime error: argument to node must be a NodeId object or a string defining a nodeid found ns=2;s=Siemens s7 300.Data.1 of type <class ‘homeassistant.util.yaml.objects.NodeStrClass’>

can you help please ?

Thank you very much

3

Hi Kassem-ajjan,

can you share your yaml configuration here? I might be able to diagnose it with more details.

I might have found the bug. I think it might be caused from a recent update in homeassistant. I am working on a fix now together with a easier integration with hacs for better tracking and updates.

4

Hello,

Thanks to JanHre on github i have a solution for opcua integration
Hi
at init.py

  nodeid = service.data[ATTR_NODEID]

replace all

 nodeid = str(service.data[ATTR_NODEID])

at sensor.py

        hub = hass.data[OPCUA_DOMAIN][hub_name]

        sensors.append(
            OpcuaNodeidSensor(
                hub,
                node[CONF_NAME],
                node[CONF_NODEID],

replace

        hub = hass.data[OPCUA_DOMAIN][hub_name]
        node_id = str(node[CONF_NODEID])

        sensors.append(
            OpcuaNodeidSensor(
                hub,
                node[CONF_NAME],
                node_id,
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5

I have just added the feature to install this custom integration using HACS. Follow the
guide in the README.md file.

Bug with the recent HA update 2024.1 is also resolved.

6

Hi,
How to write to an opc-ua server from HA

7

Hi Maerks69,

to write value to a node using this integration, you can find a new service under Developer Tools → Services → asyncua: set value

Paste the following code sample in UI Mode in the data section and make the necessary changes:

hub: plc-01    # unique hub ID defined in the coordinator
nodeid: ns=1;s=1000
value: false    # identifier type defined from the server

In YAML Mode, paste the following code sample and make the necessary changes:

service: asyncua.set_value
target: {}
data:
  hub: plc-01
  nodeid: ns=1;s=1000
  value: false