Artwork by Ashley McNamara
Inspired by Renee French
Taken from https://gopherize.me by Mat Ryer

A native Go implementation of the OPC/UA Binary Protocol.

We support the current and previous major Go release. See below for a list of Tested Platforms and Supported Features.

• v0.5.0 released on 14 Aug 2023: all Client methods must have a context
• v0.5.1 released on 22 Aug 2023: the NewClient function returns an error

In v0.3.0 on 21 Jan 2022 release we added WithContext variants for all methods to avoid a breaking change. All existing methods without a context had a disclaimer that with v0.5.0 their signature would change to include the context and that the WithContext method would be removed.

We missed to update the NewClient function in v0.5.0 which was fixed in v0.5.1.

Please update your code and let us know if there are any issues!

Thank you!

Your GOPCUA Team

# install library
go get -u github.com/gopcua/opcua

# get current date and time 'ns=0;i=2258'
go run examples/datetime/datetime.go -endpoint opc.tcp://localhost:4840

# read the server version
go run examples/read/read.go -endpoint opc.tcp://localhost:4840 -node 'ns=0;i=2261'

# get the current date time using different security and authentication modes
go run examples/crypto/*.go -endpoint opc.tcp://localhost:4840 -cert path/to/cert.pem -key path/to/key.pem -sec-policy Basic256 -sec-mode SignAndEncrypt

# checkout examples/ for more examples...

The gopcua project is sponsored by the following organizations by supporting the active committers to the project:

We would also like to list organizations which use gopcua in production:

Please open a PR to include your logo here.

gopcua is not only utilized in production environments, but it also serves as a critical component in other larger projects. Here are some projects that rely on gopcua for their functionality:

• Telegraf: This plugin-driven server agent is used for collecting and sending metrics. It leverages gopcua to extract data from OPC-UA servers and insert it into InfluxDB. Telegraf supports both polling and subscribing methods for data acquisition.
• benthos-umh: This project is built upon the benthos stream-processing framework. It utilizes gopcua to extract data from OPC-UA servers and forwards the information to MQTT or Kafka brokers. benthos-umh currently supports polling for data collection.

We are still actively working on this project and the APIs will change.

However, you can safely assume that we are aiming to make the APIs as stable as possible since the code is in use in several large scale production environments.

The Current State was moved to the Wiki.

If you are looking for ways to contribute you can

• test the high-level client against real OPC/UA servers
• add functions to the client or tell us which functions you need for gopcua to be useful
• work on the security layer, server and other components
• and last but not least, file issues, review code and write/update documentation

Also, if the library is already useful please spread the word as a motivation.

gopcua is run in production by several companies and with different equipment. The table below is an incomplete list of where and how gopcua is used to provide some guidance on the level of testing.

We would be happy if you can add your equipment to the list. Just open a PR :)

The current focus is on the OPC UA Binary protocol over TCP. No other protocols are supported at this point.

Here is the current set of supported services. For low-level access use the client Send function directly.

The Gopcua Team.

If you need to get in touch with us directly you may find us on Keybase.io but try to create an issue first.

MIT