State Variable

Description

MoreNotifications

A boolean value that is set to TRUE only by the CreateNotificationMsg() when there were too many Notifications for a single NotificationMessage.

LatePublishRequest

A boolean value that is set to TRUE to reflect that, the last time the publishing timer expired, there were no Publish requests queued.

LifetimeCounter

A value that contains the number of consecutive publishing timer expirations without Client activity before the Subscription is terminated.

MessageSent

A boolean value that is set to TRUE to mean that either a NotificationMessage or a keep-alive Message has been sent on the Subscription. It is a flag that is used to ensure that either a NotificationMessage or a keep-alive Message is sent out the first time the publishing timer expires.

NotificationsAvailable

A boolean value that is set to TRUE only when there is at least one MonitoredItem that is in the reporting mode and that has a Notification queued or there is at least one item to report whose triggering item has triggered and that has a Notification queued. The transition of this state Variable from FALSE to TRUE creates the “New Notification Queued” Event in the state table.

PublishingEnabled

The parameter that requests publishing to be enabled or disabled.

PublishingReqQueued

A boolean value that is set to TRUE only when there is a Publish request Message queued to the Subscription.

RequestedMessageFound

A boolean value that is set to TRUE only when the Message requested to be retransmitted was found in the retransmission queue.

SeqNum

The value that records the value of the sequence number used in NotificationMessages.

SubscriptionAssignedToSession

A boolean value that is set to TRUE only when the Subscription related Service is called with the Session the Subscription is assigned to. A Subscription is assigned to the Session that created it. That assignment can only be changed through successful completion of the TransferSubscriptions Service.