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Scope: Core (OPC-10000-*) All specs

16 result(s) for NotificationMessage

OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

2.1.26 NotificationMessage

NotificationMessage Message published from a Subscription that contains one or more Notifications
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

7.26 NotificationMessage

NotificationMessage The components of this parameter are defined in Table 164 . Table 164 - NotificationMessage Name Type Description NotificationMessage structure The Message that contains one or more Notifications . sequenceNumber Counter ... sequence number of the NotificationMessage . publishTime UtcTime The time that this Message was sent to the Client . If this Message is retransmitted to the Client , this parameter contains the time
OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts

6.10 Subscription Service Set

entities that periodically publish NotificationMessages for the MonitoredItem assigned to them (see 6.9 ). The NotificationMessage contains a common header followed by a series of Notifications . The format of Notifications ... deleted. Subscriptions include features that support detection and recovery of lost Messages . Each NotificationMessage contains a sequence number that allows Clients to detect missed Messages . When there are no Notifications
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.13.1.5 Queue parameters

value gets the flag set to indicate the lost values in the next NotificationMessage . Figure 17 illustrates the queue overflow handling. Figure 17 - Queue overflow handling If the queue size
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.1.1 Description

which the Subscription executes. Each time it executes, it attempts to send a NotificationMessage to the Client . NotificationMessages contain Notifications that have not yet been reported to Client . NotificationMessages ... Each keep-alive Message is a response to a Publish request in which the notificationMessage parameter does not contain any Notifications and that contains the sequence number of the next
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.1.2 State table

more Notifications have been generated, a Publish request is de-queued and a NotificationMessage is returned in the response. However, if the publishing timer expires without a Notification becoming available
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.1.3 State variables and parameters

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 ... 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
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.1.4 Functions

Client of the previous Session . CreateNotificationMsg() Increment the SeqNum and create a NotificationMessage from the MonitoredItems assigned to the Subscription . Save the newly-created NotificationMessage in the retransmission queue ... CreateSubscription request PublishingReqQueued = FALSE SeqNum = 0 SetSession() StartPublishingTimer() IssueStatusChangeNotification() Issue a StatusChangeNotification notificationMessage with a status code for the status change of the Subscription . The StatusChangeNotification notificationMessage type is defined
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.2.2 Parameters

expired this number of times without a Publish request being available to send a NotificationMessage , then the Subscription shall be deleted by the Server . requestedMaxKeepAlive Count Counter Requested maximum keep ... definition). When the publishing timer has expired this number of times without requiring any NotificationMessage to be sent, the Subscription sends a keep-alive Message to the Client . The negotiated
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.3.2 Parameters

expired this number of times without a Publish request being available to send a NotificationMessage , then the Subscription shall be deleted by the Server . requestedMaxKeepAliveCount Counter Requested maximum keep-alive ... definition). When the publishing timer has expired this number of times without requiring any NotificationMessage to be sent, the Subscription sends a keep-alive Message to the Client . The negotiated
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.5.1 Description

more Subscriptions . Second, it is used to request the Server to return a NotificationMessage or a keep-alive Message . Since Publish requests are not directed to a specific Subscription , they
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.5.2 Parameters

single response. FALSE all Notifications that were ready are included in the response. notificationMessage Notification Message The NotificationMessage that contains the list of Notifications . The NotificationMessage parameter type is specified
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.6.1 Description

Description This Service requests the Subscription to republish a NotificationMessage from its retransmission queue. If the Server does not have the requested Message in its retransmission queue, it returns
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.6.2 Parameters

IntegerId definition). retransmitSequence Number Counter The sequence number of a specific NotificationMessage to be republished (see 7.8 for Counter definition). Response responseHeader ResponseHeader Common response parameters (see 7.33 for ResponseHeader ... definition). notificationMessage Notification Message The requested NotificationMessage . The NotificationMessage parameter type is specified
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

5.14.7.1 Description

Server transfers the Subscription to the new Session , the Server shall issue a StatusChangeNotification notificationMessage with the status code Good_SubscriptionTransferred to the old Session . The StatusChangeNotification notificationMessage type
OPC-10000-4 – OPC Unified Architecture - Part 4: Services

7.25.1 Overview

Overview The NotificationMessage structure used in the Subscription Service set allows specifying different types of NotificationData . The NotificationData parameter is an extensible parameter whose structure depends on the type