opcua | Native Go OPC-UA library | Networking library

by gopcua Go Version: v0.4.0 License: MIT

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | opcua Summary

opcua is a Go library typically used in Networking applications. opcua has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Artwork by Ashley McNamara Inspired by Renee French Taken from by Mat Ryer.

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Quality

Security

License

Reuse

Support

opcua has a low active ecosystem.

It has 682 star(s) with 223 fork(s). There are 50 watchers for this library.

There were 3 major release(s) in the last 12 months.

There are 78 open issues and 209 have been closed. On average issues are closed in 64 days. There are 12 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of opcua is v0.4.0

Quality

opcua has 0 bugs and 0 code smells.

Security

opcua has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

opcua code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

opcua is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

opcua releases are available to install and integrate.

Installation instructions are not available. Examples and code snippets are available.

It has 22589 lines of code, 1027 functions and 165 files.

It has medium code complexity. Code complexity directly impacts maintainability of the code.

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opcua Key Features

No Key Features are available at this moment for opcua.

opcua Examples and Code Snippets

No Code Snippets are available at this moment for opcua.

Community Discussions

Trending Discussions on opcua

pm2 process using the old system Environment Variables on resurrection

Certificate issues for OPC-UA with Qt wrapper

read multiple values from OPC UA with opcua-asyncio

opcua - not getting all values in the queue after setting sample rate

Connect system which includes OPC UA IoT Agent, Orion Context Broker. Cygnus and Historic data with Postgres

OPCUA sdk include path

Display data from server updated in GUI in python

OPCUA C++ Monitored item doest'n callback the function

Missing data change events

Asyncio queues in python and asyncua

QUESTION

pm2 process using the old system Environment Variables on resurrection

Asked 2022-Mar-30 at 11:00

I have created a node application that is for subscribing to an OPC-UA server and storing the data on our s3 bucket. I am using the node-opcua module for that purpose.

I am working on a Windows server via RDP and the node-opcua module creates some files under %LOCALAPPDATA%\Temp as part of the process and uses it. I am using pm2 to run the application and it is getting the path of those files via TMP and TEMP environment variables which are dynamically generated by the process itself.

When the Windows server restarts it delete those files and the location updates of the new file. I already have run pm2 save and put the pm2 resurrect command in the Batch file which has a shortcut in the windows startup to make sure the process automatically gets started.

The issue was that the pm2 process was resurrected but still throwing the error %LOCALAPPDATA%\Temp\{some_path} file not found by the node-opcua process which was running through pm2. I ran pm2 restart manually but still didn't work out.

...

ANSWER

Answered 2022-Mar-30 at 11:00

First I was thinking of it from the problem with the node-opcua module and thought about how can make it use the new system variables, but that was not in had as the process keeps making and deleting temporary files, so I need the pm2 to use the new system variable which has the updated path after system reboot and was not updating even after pm2 restart.

So, for updating the variables I figured out two solutions:

Either delete the old process and initiate a new pm2 process to run that application and put it in the batch file which is being called at server reboot
Adds pm2 restart {name} --update-variable after pm2 resurrect and the system variables will be updated.

Source https://stackoverflow.com/questions/71676016

QUESTION

Certificate issues for OPC-UA with Qt wrapper

Asked 2022-Jan-18 at 16:12

I'm running the qtopcuaviewer example following these instructions to create the client certificate:

...

ANSWER

Answered 2022-Jan-18 at 16:12

You have to deploy the TLS plugin found under:

Source https://stackoverflow.com/questions/70757945

QUESTION

read multiple values from OPC UA with opcua-asyncio

Asked 2022-Jan-06 at 12:19

I'm looking for a way to read the values from multiple nodes at once instead of using a loop.

I created a list with the node objects from a CSV file.

...

ANSWER

Answered 2022-Jan-06 at 12:19

You can use read_values from client to read all values in one network request.

Example:

Source https://stackoverflow.com/questions/70579950

QUESTION

opcua - not getting all values in the queue after setting sample rate

Asked 2021-Nov-12 at 04:07

This is my code in python:

...

ANSWER

Answered 2021-Nov-12 at 04:07

It looks like when you call modify_monitored_item and don't specify the new_queuesize it defaults to 0, which tells the server to set it to "default" queue size, which is 1 according to the spec.

Source https://stackoverflow.com/questions/69937262

QUESTION

Connect system which includes OPC UA IoT Agent, Orion Context Broker. Cygnus and Historic data with Postgres

Asked 2021-Oct-25 at 12:39

I am trying to set up a system to save historic data with the flow like this: Prosys OPC-UA Server Simulation -> OPC-UA FIWARE IoT Agent -> Orion Context Broker -> FIWARE Cygnus Connector -> PostgreSQL database.

Here is the document I used to compose the docker-compose file:

Historic-Context-Flume

OPC-UA IoT Agent

Here is the docker-compose and .env file I used

docker-compose.yml

...

ANSWER

Answered 2021-Sep-01 at 10:31

You have a complex scenario here, composed of an end-to-end chain of 5 components:

Prosys OPC-UA Server Simulation
OPC-UA FIWARE IoT Agent
Orion Context Broker
FIWARE Cygnus Connector
PostgreSQL database

My recomendation here would be to check every step in the chain (looking in logs, etc.) to ensure everything is correct before of checking the next step.

Source https://stackoverflow.com/questions/69002930

QUESTION

OPCUA sdk include path

Asked 2021-Sep-23 at 17:45

I have trouble with include uaplatformlayer.h in example from OPCUA client example. I found this example in SDK. I tried to do own makefile, to build example client lesson01. I use Visual Studio Code. It can't find this .h file.

...

ANSWER

Answered 2021-Sep-23 at 17:45

You need to add "includes" to the recipe for the .o files:

Source https://stackoverflow.com/questions/69304677

QUESTION

Display data from server updated in GUI in python

Asked 2021-Aug-21 at 11:16

here's what I have in mind: I have data (numbers) in an OPC server, which I want to retrieve via a GUI. This data should be updated every 5 seconds and therefore also be displayed in the GUI. I had tried this via a while loop, which also works as print output, but then no window is displayed to me anymore.

Would there perhaps someone an idea how I can implement this?

...

ANSWER

Answered 2021-Aug-21 at 11:16

Using while True is not good idea in any GUI. It blocks mainloop which gets key/mouse event from system, sends them to widgets, runs functions assigned to button and other widgets, (re)draw window and widgets.

You may need to run while True in separated thread - but thread can't update widgets and it would have to send result to main thread - and this makes other problems.

Or you should check if you can use "timer" instead of while to run code periodically.
All GUIs have some "timer" for this.
And tkinter has master.after(milliseconds, function_name)

I couldn't test it but it could looks like this.

Source https://stackoverflow.com/questions/68858776

QUESTION

OPCUA C++ Monitored item doest'n callback the function

Asked 2021-Aug-06 at 09:26

I'm quite new in the opcua's world and I'm trying to monitor a server variable with a client in C++.

I'm on the 1.2.2 version of opcua

I have a boolean variable in the server at the node (1,6070) and when I run the following code I receive the LOG :

[2021-08-03 15:27:47.442 (UTC+0200)] info/session Connection 5 | SecureChannel 2 | Session ns=1;g=913a21de-f467-5bc9-ed9e-29b27b470490 | Subscription 2 | Created the Subscription with a publishing interval of 500.00 ms

But I've never reach the function 'handler_events_datachange' in which I only put an output for now. (I'm sure that the value in the node 6070 changed btw)

Thanks for helping!

...

ANSWER

Answered 2021-Aug-06 at 09:26

I finally found the error !

The problem comme from the fact no means of handling asynchronous events automatically is provided. However, some synchronous function calls will trigger handling, but to ensure this happens a client should periodically call UA_Client_run_iterate explicitly.

So the solution is to add UA_Client_run_iterate(client,100) in the while().

I didn't fully understand what the timeout was about but I'll complete this answer if I can

Source https://stackoverflow.com/questions/68637076

QUESTION

Missing data change events

Asked 2021-Aug-03 at 14:31

I have a data source delivering values that I want to expose through an OPCUA server. The data source is event-driven and can deliver multiples values for one variable in a single notification. I want to configure an OPCUA client to receive all values regardless of the period (just no losses).

What I tried:

Simulation

I have variable who ramps from 1 to 10 every 100ms. The data source emits n events containing m values changes. When the server receives events, he writes the corresponding OPCUA node with all the changes.

Client configuration

The client has a subcription with a publishInterval of 1000 ms, a monitored item with a queue size of 100 and a samplingInterval of 0 ms. The server is sending back a revisedSamplingInterval of 50ms.

Expected results

I want to receive all data change from 1 to 10.

Results

I'm missing some values. I think it's because I write the OPCUA node with all value when I receive them and the server can't sample it but I'm not sure.

Questions

It is possible to achieve this with opcua ? Do I need a special treatment on the server ? Is it normalized or is it implementation details ? Do I need other settings for the client ?

...

ANSWER

Answered 2021-Aug-02 at 15:53

You’re doing the right thing in the client by creating a MonitoredItem with a larger queue size but unfortunately whether or not the the rest of this works is going to be an implementation detail of the server and how it implements sampling and subscriptions.

Source https://stackoverflow.com/questions/68624385

QUESTION

Asyncio queues in python and asyncua

Asked 2021-Jul-31 at 04:36

I'm working with asyncio and asyncua libraries in python 3.8.7 and I want to use asyncio.Queue to pass the data from the async function into the main thread.

However, the issue I encountered is that my queue does not get any messages after the first await.

Here's my example:

...

ANSWER

Answered 2021-Jul-31 at 04:36

This is a bit of a guess on my part, but I think you have a race condition. Here is the while loop in the main thread:

Source https://stackoverflow.com/questions/68597756

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