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https://github.com/hylasoft-usa/h-opc

OPC client made simpler, for UA and DA
https://github.com/hylasoft-usa/h-opc

c-sharp client monitoring opc

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OPC client made simpler, for UA and DA

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README 

        
h-opc [![Build status](https://ci.appveyor.com/api/projects/status/oajkgccisoe98gip?svg=true)](https://ci.appveyor.com/project/Hyla-Soft-Inc/h-opc) [![NuGet Status](http://img.shields.io/nuget/v/H.Opc.svg)](https://www.nuget.org/packages/H.Opc) [![Coverage Status](https://coveralls.io/repos/github/jmbeach/h-opc/badge.svg?branch=master)](https://coveralls.io/github/jmbeach/h-opc?branch=master)

==============



An Opc Library and a command line to perform OPC operations with ease and transparency among different protocols. Currently supports synchronous operation over UA and DA protocols.



## Table of Contents

* [Use](#use)

* [Documentation](#documentation)

  * [Exploring the nodes](#exploring-the-nodes)

  * [Read a node](#read-a-node)

  * [Writing to a node](#writing-to-a-node)

  * [Monitoring a tag](#monitoring-a-tag)

  * [Go Asynchronous!](#go-asynchronous)

* [Command line](#command-line)

* [Build + Contribute](#build--contribute)

  * [Unit Testing](#unit-testing)

    * [UA](#ua)

    * [DA](#da)

* [Disclaimer](#disclaimer)

* [Roadmap](#roadmap)



## Use



A [nuget package](https://www.nuget.org/packages/H.Opc/) is available for the library. To install `H.Opc`, run the following command in the Package Manager Console:



    PM> Install-Package H.Opc



*NOTE: Package was moved on NuGet.org from Hylasoft.Opc to H.Opc because of NuGet account issues*



To install the command line interface, head to the [`release section`](https://github.com/hylasoft-usa/h-opc/releases).



## Documentation



to use the UA Client simply...



````cs

using (var client = new UaClient(new Uri("opc.tcp://host-url")))

{

  client.Connect();

  // Use `client` here

}

````



or with options...



````cs

var options = new UaClientOptions {

  UserIdentity = new Opc.Ua.UserIdentity("", "")

};

using (var client = new UaClient(new Uri("opc.tcp://host-url")), options)

{

  client.Connect();

  // Use `client` here

}

````



and to use the DA Client instead:



````cs

using (var client = new DaClient(new Uri("opcda://host-url")))

{

  client.Connect();

  // Use `client` here

}

````



#### Exploring the nodes



You can get a reference to a node with...



````cs

var node = client.FindNode("path.to.my.node");

````



This will get you a reference to the node `node` in the folder `path.to.my`.



You can use the node reference to explore the hieriarchy of nodes with the properties `Parent` and `SubNodes`. For example...



````cs

Node parentNode = node.Parent;

IEnumerable children = client.ExploreFolder(node.Tag);

IENumerable grandChildren = children.SelectMany(m => client.ExploreFolder(m.Tag));

````



#### Read a node



Reading a variable? As simple as...



````cs

var myString = client.Read("path.to.string").Value;

var myInt = client.Read("path.to.num").Value;

````



The example above will read a string from the tags `string` and `num` in the folder `path.to`



#### Writing to a node



To write a value just...



````cs

client.Write("path.to.string", "My new value");

client.Write("path.to.num", 42);

````



#### Monitoring a tag



Dead-simple monitoring:



````cs

client.Monitor("path.to.string", (readEvent, unsubscribe) =>

{

  DoSomethingWithYourValue(readEvent.Value);

  if(ThatsEnough == true)

    unsubscribe();

});



````



The second parameter is an `Action` that has two parameter:



- `readEvent` contains all the information relevant to the event such as timestamps, quality and the value

- `unsubscribe` is a function that unsubscribes the current monitored item. It's very handy when you want to terminate your callback



it's **important** that you either enclose the client into a `using` statement or call `Dispose()` when you are finished, to unsubscribe all the monitored items and terminate the connection!



### Go Asynchronous!



Each method as an asynchornous counterpart that can be used with the async/await syntax. The asynchronous syntax is **recommended** over the synchronous one (maybe the synchronous one will be deprecated one day).



## Command line



You can also use the command line interface project to quickly test your an OPC. Build the `h-opc-cli` project or download it from the `release` page of this repository, then run:



````

h-opc-cli.exe [OpcType] [server-url]

````



Where `OpcType` is the type of opc to use (e.g: "UA", "DA"). Once the project is running, you can use the internal command to manipulate the variable. To have more information aboute the internal commands, type `help` or `?`



## Build + Contribute



The repository uses [cs-boilerplate](https://github.com/hylasoft-usa/cs-boilerplate). Read the readme of the cs-boilerplate repository to understand how to build, run tasks and commit your work to `master`.



### Unit Testing



+ The unit tests rely on locally running simulator OPC servers. The ones used in this project are [OPC Foundation's Sample Server](https://opcfoundation.org/developer-tools/developer-kits-unified-architecture/sample-applications)

and [Graybox Simulator](http://gray-box.net/download_graysim.php?lang=en)

  + You must download OPC Foundation's Sample Server from the OPC Foundation website (link above), but GrayBox can be downloaded using [Chocolatey](https://chocolatey.org/)

    + `choco install grayboxsimulator`

  + OPC Foundation's Sample Server requires you register with the website before you can download.

+ The tests use [NUnit](https://github.com/nunit/nunit). To run them in Visual Studio, install the [NUnit 3 Test Adapter](https://marketplace.visualstudio.com/items?itemName=NUnitDevelopers.NUnit3TestAdapter)

+ To configure the test project, run the `configure.ps1` script in the root h-opc directory



#### UA

+ Open OPC Foundation's Sample Client (under Start -> OPC Foundation -> UA x.xx -> Sample Applications -> Opc.Ua.SampleClient.exe)

  + This will start the server too

  + Running tests will only work with this program open



#### DA

+ With Graybox Simulator installed, tests should automatically work



## Disclaimer



The following binaries belong to the [OPC Foundation](https://opcfoundation.org/). You must become a registered user in order to use them:



- `OPC.Ua.Client.dll`

- `OPC.Ua.Core.dll`

- `OPC.Ua.Configuration.dll`

- `OpcComRcw.dll`

- `OpcNetApi.Com.dll`

- `OpcNetApi.dll`



You must agree to the terms and condition exposed on the OPC Foundation website. Hyla Soft is not responsible of their usage and cannot be held responsible.



## Roadmap



- [ ] Add promise-based asynchronous calls