/
Class1.cs
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/
Class1.cs
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using System;
using System.Collections.Generic;
using System.Threading.Tasks;
using Opc.Ua;
using Opc.Ua.Client;
namespace OPCClient
{
public class Client
{
private static ApplicationConfiguration _config;
private static Session _session;
private static bool _haveAppCertificate;
// private static string _endpointUrl; // "opc.tcp://192.168.11.90:49320";
private static Subscription _subscription;
private static List<MonitoredItem> _items;
private CreateSubscription _callback;
// Делегат для функции обратного вызова, выполняющаяся при получении нового значения от тега
public delegate void CreateSubscription(MonitoredItem item, MonitoredItemNotificationEventArgs e);
/// <summary>
/// Подключение к OPC-серверу по его адресу. Выполняется асинхронно.
/// </summary>
/// <param name="ep">Адрес OPC-сервера</param>
/// <returns></returns>
public async Task Connect(string endpointUrl)
{
_config = new ApplicationConfiguration()
{
ApplicationName = "Console OPC-Client",
ApplicationType = ApplicationType.Client,
ApplicationUri = "urn:localhost:OPCFoundation:SampleClient",
SecurityConfiguration = new SecurityConfiguration
{
ApplicationCertificate = new CertificateIdentifier
{
StoreType = "Directory",
StorePath = "./OPC Foundation/CertificateStores/MachineDefault",
SubjectName = Utils.Format("CN={0}, DC={1}", "Console OPC-Client", Utils.GetHostName())
},
TrustedPeerCertificates = new CertificateTrustList
{
StoreType = "Directory",
StorePath = "./OPC Foundation/CertificateStores/UA Applications",
},
TrustedIssuerCertificates = new CertificateTrustList
{
StoreType = "Directory",
StorePath = "./OPC Foundation/CertificateStores/UA Certificate Authorities",
},
RejectedCertificateStore = new CertificateTrustList
{
StoreType = "Directory",
StorePath = "./OPC Foundation/CertificateStores/RejectedCertificates",
},
NonceLength = 32,
AutoAcceptUntrustedCertificates = true
},
TransportConfigurations = new TransportConfigurationCollection(),
TransportQuotas = new TransportQuotas { OperationTimeout = 15000 },
ClientConfiguration = new ClientConfiguration { DefaultSessionTimeout = 60000 }
};
await _config.Validate(ApplicationType.Client);
_haveAppCertificate = _config.SecurityConfiguration.ApplicationCertificate.Certificate != null;
if (_haveAppCertificate && _config.SecurityConfiguration.AutoAcceptUntrustedCertificates)
{
_config.CertificateValidator.CertificateValidation += new CertificateValidationEventHandler(CertificateValidator_CertificateValidation);
}
Uri endpointURI = new Uri(endpointUrl);
var endpointCollection = DiscoverEndpoints(_config, endpointURI, 10);
var selectedEndpoint = SelectUaTcpEndpoint(endpointCollection, _haveAppCertificate);
var endpointConfiguration = EndpointConfiguration.Create(_config);
var endpoint = new ConfiguredEndpoint(selectedEndpoint.Server, endpointConfiguration);
endpoint.Update(selectedEndpoint);
_session = await Session.Create(_config, endpoint, true, "Console OPC Client", 60000, null, null);
_subscription = new Subscription(_session.DefaultSubscription) { PublishingInterval = 1000 };
}
/// <summary>
/// Добавление тега в список подписки на получение новых значений
/// </summary>
/// <param name="name">Отображаемое имя тега</param>
/// <param name="addr">Адрес тега</param>
public void AddItem(string name, string addr)
{
if (_items == null)
{
_items = new List<MonitoredItem>();
}
// Создать переменню типа MonitoredItem
var item = new MonitoredItem(_subscription.DefaultItem)
{
DisplayName = name,
StartNodeId = addr
};
_items.Add(item);
}
/// <summary>
/// Получить значение тега по его адресу
/// </summary>
/// <param name="nodeID">Адрес тега</param>
/// <returns>Значение тега</returns>
public DataValue ReadValue(string nodeID)
{
DataValue value = _session.ReadValue(nodeID);
return value;
}
/// <summary>
/// Запись значения тега по его адресу. В настоящее время проверено значение только для типа данных Single
/// </summary>
/// <param name="nodeID">Адрес тега</param>
/// <param name="value">Новое значение тега</param>
/// <returns>True - в случае успешной записи нового значения, False - при ошибке записи</returns>
public static bool WriteValue(string nodeID, Single value)
{
WriteValueCollection writeValues = new WriteValueCollection();
StatusCodeCollection results = new StatusCodeCollection();
DiagnosticInfoCollection diagnosticInfos = new DiagnosticInfoCollection();
WriteValue intWriteVal = new WriteValue();
intWriteVal.NodeId = new NodeId(nodeID);
intWriteVal.AttributeId = Attributes.Value;
intWriteVal.Value = new DataValue(value);
writeValues.Add(intWriteVal);
// Call the Write service
ResponseHeader responseHeader = _session.Write(null,
writeValues,
out results,
out diagnosticInfos);
bool res = StatusCode.IsGood(results[0].Code);
return res;
}
private void Subscribe(CreateSubscription callback)
{
_callback = callback;
_items.ForEach(i => i.Notification += OnNotification);
_subscription.AddItems(_items);
_session.AddSubscription(_subscription);
_subscription.Create();
}
private void CertificateValidator_CertificateValidation(CertificateValidator validator, CertificateValidationEventArgs e)
{
Console.WriteLine($"Принятый сертификат: {e.Certificate.Subject}");
e.Accept = (e.Error.StatusCode == StatusCodes.BadCertificateUntrusted);
}
private EndpointDescriptionCollection DiscoverEndpoints(ApplicationConfiguration config, Uri discoveryUrl, int timeout)
{
// use a short timeout.
EndpointConfiguration configuration = EndpointConfiguration.Create(config);
configuration.OperationTimeout = timeout;
using (DiscoveryClient client = DiscoveryClient.Create(
discoveryUrl,
EndpointConfiguration.Create(config)))
{
try
{
EndpointDescriptionCollection endpoints = client.GetEndpoints(null);
ReplaceLocalHostWithRemoteHost(endpoints, discoveryUrl);
return endpoints;
}
catch (Exception e)
{
Console.WriteLine($"Не удалось найти OPC-сервер по адресу: {discoveryUrl}");
Console.WriteLine($"Ошибка = {e.Message}");
throw e;
}
}
}
private EndpointDescription SelectUaTcpEndpoint(EndpointDescriptionCollection endpointCollection, bool haveCert)
{
EndpointDescription bestEndpoint = null;
foreach (EndpointDescription endpoint in endpointCollection)
{
if (endpoint.TransportProfileUri == Profiles.UaTcpTransport)
{
if (bestEndpoint == null ||
haveCert && (endpoint.SecurityLevel > bestEndpoint.SecurityLevel) ||
!haveCert && (endpoint.SecurityLevel < bestEndpoint.SecurityLevel))
{
bestEndpoint = endpoint;
}
}
}
return bestEndpoint;
}
private void ReplaceLocalHostWithRemoteHost(EndpointDescriptionCollection endpoints, Uri discoveryUrl)
{
foreach (EndpointDescription endpoint in endpoints)
{
endpoint.EndpointUrl = Utils.ReplaceLocalhost(endpoint.EndpointUrl, discoveryUrl.DnsSafeHost);
StringCollection updatedDiscoveryUrls = new StringCollection();
foreach (string url in endpoint.Server.DiscoveryUrls)
{
updatedDiscoveryUrls.Add(Utils.ReplaceLocalhost(url, discoveryUrl.DnsSafeHost));
}
endpoint.Server.DiscoveryUrls = updatedDiscoveryUrls;
}
}
/// <summary>
/// Оформл
/// </summary>
/// <param name="callback"></param>
public void SubsOnNewData(CreateSubscription callback)
{
// Этот метод вызывается из главной программы (вызывающей)
Subscribe(callback);
}
private void OnNotification(MonitoredItem item, MonitoredItemNotificationEventArgs e)
{
_callback?.Invoke(item, e);
}
}
}