easyUAClient.SubscribeMonitoredItem(
                new EasyUAMonitoredItemArguments(
                    new UAAttributeArguments(endpointDescriptor, nodeDescriptor),
                    new UASubscriptionParameters(publishingInterval),
                    new UAMonitoringParameters(samplingInterval,
                        new UADataChangeFilter(UADataChangeTrigger.StatusValue))));

using Opc.Ua;
using OpcLabs.BaseLib.Annotations;
 
namespace OpcLabs.EasyOpc.UA
{
    /// <summary>
    /// Specifies the conditions under which a data change notification should be reported.
    /// </summary>
    /// <remarks>
    /// If the <see cref="UADataChangeFilter"/> is not applied to the monitored item, <see cref="StatusValue"/> is the default 
    /// reporting behaviour.
    /// </remarks>
    [Designable]
    public enum UADataChangeTrigger
    {
        /// <summary>
        /// Report a notification ONLY if the StatusCode associated with the value changes.
        /// </summary>
        Status = DataChangeTrigger.Status,
 
        /// <summary>
        /// Report a notification if either the StatusCode or the value change. The Deadband filter can be used in addition for
        /// filtering value changes.
        /// </summary>
        /// <remarks>
        /// This is the default setting if no filter is set.
        /// </remarks>
        StatusValue = DataChangeTrigger.StatusValue,
 
        /// <summary>
        /// Report a notification if either StatusCode, value or the SourceTimestamp change. The Deadband filter can be used in
        /// addition for filtering value changes.
        /// </summary>
        StatusValueTimestamp = DataChangeTrigger.StatusValueTimestamp,
    }
}