void StartMonitoring()
{
foreach (var item in MonitoredMeasurements)
{
var nodeId = OpcUaHelper.FindNode(item.Path, ObjectIds.ObjectsFolder, l_session);
var sub = new Subscription
{
PublishingInterval = item.MonitorResolution,
PublishingEnabled = true,
LifetimeCount = 0,
KeepAliveCount = 0,
DisplayName = item.Path,
Priority = byte.MaxValue
};
MonitoredItem monitoredItem = new MonitoredItem()
{
StartNodeId = nodeId,
AttributeId = Attributes.Value,
DisplayName = item.Name,
SamplingInterval = item.MonitorResolution
};
sub.AddItem(monitoredItem);
l_session.AddSubscription(sub);
sub.Create();
sub.ApplyChanges();
monitoredItem.Notification += (monitored, args) =>
{
var p = (MonitoredItemNotification)args.NotificationValue;
MonitorData(item, p.Value);
};
}
}
void ReadMeasurement(PolledMeasurement measurement)
{
OpcMetric metric = new OpcMetric();
metric.Measurement = (MeasurementDto)measurement;
if (!l_session.Connected)
{
l_logger.ErrorFormat(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
throw new Exception(string.Format("Server not connected. Cannot read path {0}.", measurement.Name));
}
var nodesToRead = OpcUaHelper.GetReadValueIdCollection(measurement.Path, l_session);
DataValueCollection results;
DiagnosticInfoCollection diag;
l_session.Read(
requestHeader: null,
maxAge: 0,
timestampsToReturn: TimestampsToReturn.Neither,
nodesToRead: nodesToRead,
results: out results,
diagnosticInfos: out diag);
var val = results[0];
metric.OpcValue = val.Value;
metric.Opcstatus = val.StatusCode.ToString();
if (OpcHelper.QualifyMetric(ref metric, l_cache))
{
l_cache[metric.Measurement.Name] = metric.OpcValue;
l_metricCollection.Add(metric);
}
}
//bool QualifyMetric(ref OpcMetric metric)
//{
// if (PointHasGoodOrDifferentBadStatus(metric))
// {
// if (!l_cache.ContainsKey(metric.Measurement.Name))
// {
// l_cache.Add(metric.Measurement.Name, metric.OpcValue);
// metric.Measurement.LastOpcstatus = metric.Opcstatus;
// metric.Measurement.LastValue = metric.OpcValue;
// }
// else
// {
// object lastvalue;
// l_cache.TryGetValue(metric.Measurement.Name, out lastvalue);
// metric.Measurement.LastValue = lastvalue;
// }
// if (!PointIsValid(metric) || !PointMatchesType(metric))
// {
// // Set de default value for the type specified
// l_logger.ErrorFormat("Invalid point: measurement.name<{0}>, measurement.path<{1}>, metric.value<{2}>", metric.Measurement.Name, metric.Measurement.Path, metric.OpcValue.ToString());
// switch (metric.Measurement.DataType)
// {
// case "number":
// metric.OpcValue = 0;
// break;
// case "boolean":
// metric.OpcValue = false;
// break;
// case "string":
// metric.OpcValue = "";
// break;
// default:
// l_logger.Error("No valid datatype, ignoring point");
// break;
// }
// return false;
// }
// }
// // Check for deadband
// if (PointIsWithinDeadband(metric)) return false;
// if (!PointMatchesType(metric))
// {
// l_logger.ErrorFormat("Invalid type returned from OPC. Ignoring point {0}", metric.Measurement.Name);
// return false;
// }
// return true;
//}
//bool PointMatchesType(OpcMetric metric)
//{
// var match = (metric.OpcValue.IsNumber() && metric.Measurement.DataType == "number")
// || metric.OpcValue.IsBoolean() && metric.Measurement.DataType == "boolean"
// || metric.OpcValue.IsString() && metric.Measurement.DataType == "string";
// if (!match)
// {
// //log here
// }
// return match;
//}
//bool PointIsValid(OpcMetric p)
//{
// // check if the value is a type that we can handle (number or a bool).
// return (p.OpcValue != null && (p.OpcValue.IsBoolean() || p.OpcValue.IsNumber())) || p.OpcValue.IsString();
//}
//bool PointHasGoodOrDifferentBadStatus(OpcMetric p)
//{
// var curr = p.Opcstatus;
// var prev = p.Measurement.LastOpcstatus;
// if (curr == "Good" || curr != prev) return true;
// return false;
//}
//bool PointIsWithinDeadband(OpcMetric metric)
//{
// // some vars for shorter statements later on.
// var curr = metric.OpcValue;
// var prev = metric.Measurement.LastValue;
// var dba = metric.Measurement.DeadbandAbsolute;
// var dbr = metric.Measurement.DeadbandRelative;
// // return early if the type of the previous value is not the same as the current.
// // this will also return when this is the first value and prev is still undefined.
// if (curr.GetType() != prev.GetType()) return false;
// // calculate deadbands based on value type. For numbers, make the
// // calculations for both absolute and relative if they are set. For bool,
// // just check if a deadband has been set and if the value has changed.
// if (curr.IsNumber())
// {
// if (dba > 0 && Math.Abs(Convert.ToDecimal(curr) - Convert.ToDecimal(prev)) < dba)
// {
// return true;
// }
// if (dbr > 0 && Math.Abs(Convert.ToDecimal(curr) - Convert.ToDecimal(prev)) < Math.Abs(Convert.ToDecimal(prev)) * dbr)
// {
// // console.log("New value is within relative deadband.", p);
// return true;
// }
// }
// else if (curr.IsBoolean())
// {
// if (dba > 0 && prev == curr)
// // console.log("New value is within bool deadband.", p);
// return true;
// }
// else if (curr.IsString())
// return true;
// return false;
//}
#endregion
#region methods
private Session InitializeSession(Uri url, X509Certificate2 applicationCertificate = null)
{
var certificateValidator = new CertificateValidator();
certificateValidator.CertificateValidation += (sender, eventArgs) =>
{
if (ServiceResult.IsGood(eventArgs.Error))
{
eventArgs.Accept = true;
}
else if ((eventArgs.Error.StatusCode.Code == StatusCodes.BadCertificateUntrusted) && true) // AutoAcceptUntrustedCertificates = true;
{
eventArgs.Accept = true;
}
else
{
throw new Exception(string.Format("Failed to validate certificate with error code {0}: {1}, statusCode: {2}", eventArgs.Error.Code, eventArgs.Error.AdditionalInfo, eventArgs.Error.StatusCode));
}
};
// Build the application configuration
var appInstance = new ApplicationInstance
{
ApplicationType = ApplicationType.Client,
ConfigSectionName = "Odenwald",
ApplicationConfiguration = new ApplicationConfiguration
{
ApplicationUri = url.ToString(),
ApplicationName = "Odenwald",
ApplicationType = ApplicationType.Client,
CertificateValidator = certificateValidator,
ServerConfiguration = new ServerConfiguration
{
MaxSubscriptionCount = 100,
MaxMessageQueueSize = 10,
MaxNotificationQueueSize = 100,
MaxPublishRequestCount = 20
},
SecurityConfiguration = new SecurityConfiguration
{
AutoAcceptUntrustedCertificates = true
},
TransportQuotas = new TransportQuotas
{
OperationTimeout = 600000,
MaxStringLength = 1048576,
MaxByteStringLength = 1048576,
MaxArrayLength = 65535,
MaxMessageSize = 4194304,
MaxBufferSize = 65535,
ChannelLifetime = 600000,
SecurityTokenLifetime = 3600000
},
ClientConfiguration = new ClientConfiguration
{
DefaultSessionTimeout = 60000,
MinSubscriptionLifetime = 10000
},
DisableHiResClock = true
}
};
// Assign a application certificate (when specified)
if (applicationCertificate != null)
{
appInstance.ApplicationConfiguration.SecurityConfiguration.ApplicationCertificate = new CertificateIdentifier(applicationCertificate);
}
// Find the endpoint to be used
var endpoints = OpcUaHelper.SelectEndpoint(url, false);//UseMessageSecurity = false;
// Create the OPC session:
var session = Session.Create(
configuration: appInstance.ApplicationConfiguration,
endpoint: new ConfiguredEndpoint(
collection: null,
description: endpoints,
configuration: EndpointConfiguration.Create(applicationConfiguration: appInstance.ApplicationConfiguration)),
updateBeforeConnect: false,
checkDomain: false,
sessionName: "Odenwald",
sessionTimeout: 60000U,
identity: null,
preferredLocales: new string[] { });
return(session);
}