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108 result(s) for Subscriber

• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  2.1.42 Subscriber
  Subscriber entity receiving DataSetMessages from a Message Oriented Middleware Note 1 to entry: A Subscriber can be a native OPC UA Application or an application that has just knowledge about ... Subscription in the OPC UA ClientServer model has a different meaning than the Subscriber in the PubSub model
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  2.1.13 DataSetMessage
  Message Oriented Middleware (transport layer) for delivery by the Publisher . The Subscriber receives the DataSetMessage as the payload of a NetworkMessage from the Publisher with additional headers that
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  2.1.22 NetworkMessage
  immutable payload handed off to the Message Oriented Middleware for delivery. The Subscriber often thinks of the message as not only that immutable payload from the sender, but also various
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.3.7 Server to Server interactions
  PubSub model where each peer Application is both a Publisher and a Subscriber . Figure 6 extends the previous example and illustrates the chaining of Servers together for vertical access
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.5 Publish-Subscribe
  formal messaging protocol of the Publisher to the formal messaging protocol of the Subscriber . PubSub is used to communicate messages between different system components without these components having to know ... configured with what data to send. There is no connection establishment between Publisher and Subscriber . The knowledge about who Subscribers are and the forwarding of published data to the Subscribers
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.6 Synergy of models
  Quite typically, a Publisher will be a Server (the owner of information) and a Subscriber is often a Client . Above all, the PubSub Information Model for configuration promotes the configuration
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  3.1.42 SecurityGroup
  SecurityGroup Publisher(s) and Subscriber (s) that utilize a shared security context Note 1 to entry: This context could include share keys
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.1 OPC UA security environment
  levels of security and different security infrastructure. For example, both Client - Server and Publisher - Subscriber communication is shown in Figure 1 . OPC UA also defines global services such as Certificate
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.3.2.3 Resource Exhaustion
  PubSub communication, the Publisher is not susceptible. In broker-less PubSub communication, the Subscriber can, with the use of filters, bypass any resource exhaustion issues. In broker case, both ... Publisher and Subscriber are connected to the broker. Although the Publisher and Subscriber are not directly susceptible (as in the broker-less case), the broker is susceptible. The details
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.3.7 Malformed Messages
  Client s, Servers or Subscribers . The OPC UA Client , Server or Subscriber could incorrectly handle certain malformed Message s by performing unauthorized operations or processing unnecessary information. It could result
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.5.3.2 Broker-less
  SecurityGroup to share information. An SKS could be part of a Publisher or Subscriber . It could also be a centrally managed SKS that is part ... applications must trust all other applications in the group. Any application ( Publisher or Subscriber ) in the group can publish a message and any application ( Publisher or Subscriber ) in the group
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.13 OPC UA security related Services
  messages secured with the key. To obtain the required keys, the Publisher or Subscriber make use of Client - Server communication. The keys could also be obtained using session-less method
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.1.2.2 Message flooding
  ignore extra responses that could be received and closes the connection. In PubSub , the Subscriber filters messages that it processes based on header information, allowing it to quickly discard
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.1.10 Rogue Server or Publisher
  would not be able to generate signed messages to the Client . OPC UA Subscriber applications counter the effect of a rogue Publisher by validating the signature on the published messages
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.2.2 Application Authentication
  keys from a SecurityKeyService (SKS). Although the application authentication is not directly between the Subscriber and the Publisher, the SKS ensures that only authenticated applications can obtain the keys used ... Publisher and Subscriber
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  3.1.4 DataSetReader
  Oriented Middleware and decodes the DataSetMessage to a DataSet for further processing in the Subscriber
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  4.3 Decoupling by use of middleware
  middleware In PubSub the participating OPC UA Applications can assume the roles Publisher and Subscriber . Publishers are the sources of data, while Subscribers consume that data. Communication in PubSub ... formal messaging protocol of the Publisher to the formal messaging protocol of the Subscriber
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  4.4 Synergy of models
  Publisher will be an OPC UA Server (the owner of information) and a Subscriber is often an OPC UA Client . Above all, the PubSub Information Model for configuration
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.1 General
  DataSet constitutes the payload of messages provided by the Publisher and consumed by the Subscriber . The DataSet is described in 5.2 . The mapping to messages is described ... participating entities like Publisher and Subscriber are described in 5.4 . The abstract communication parameters are described in Clause 6 . The mapping of this model to concrete message and transport protocol
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.2.3 DataSetMetaData
  There are multiple options for Subscribers to get the initial DataSetMetaData : The Subscriber is an OPC UA Client and is able to get the necessary configuration information from the PubSub ... configuration model (see 9.1.4.2.1 ) provided by the Publisher or from a configuration server. The Subscriber supports the OPC UA configuration Methods defined in the PubSub configuration model. The Subscriber receives
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.3.3 DataSetMessage
  header settings for DataSetMessage and NetworkMessage define the communication contract between Publisher and Subscriber . A heartbeat DataSetMessage is a key frame that only contains header information. It is used
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.3.5 Message security
  encryption Signing and encryption Message security is end-to-end security (from Publisher to Subscriber ) and requires common knowledge of the cryptographic keys necessary to sign and encrypt ... Publisher side as well as validate signature and decrypt on the Subscriber side. The keys used for message security are managed in the context of a SecurityGroup . The basic concepts
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.3.7 SecurityGroup
  their access Permissions for a SecurityGroup . This mapping defines if a Publisher or Subscriber has access to the security keys of a SecurityGroup . The SKS is described in more detail
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.3.8 Topics
  used with Broker -less middleware where the filtering is done by the Subscriber . Topics have a hierarchical structure with different Topic levels separated by a delimiter like '/'. For example: opcua/json/status/FlowController1
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.2.1 General
  General Subscriber s are the consumers of NetworkMessages from the Message Oriented Middleware . They may be OPC UA Clients , OPC UA Servers or applications that are neither Client nor Server ... only understand the structure of OPC UA PubSub messages. Figure 7 illustrates a Subscriber with filtering, decoding and dispatching of NetworkMessages . Figure 7 - Subscriber details To determine for which DataSetMessage
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.2.2 Message reception
  Message reception Figure 8 illustrates the process inside a Subscriber when receiving, decoding and interpreting messages and the parameter model required for accomplishing it. As for the Publisher , the components ... should be considered abstract. Figure 8 - Subscriber message reception sequence The Subscriber need to select the required Message Oriented Middleware and establish a connection to it using the provided Address
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.4 Configuration Tool
  messages. One example are HMI applications where the configuration can be done inside the Subscriber . But if the Subscriber is a device, it is expected that a configuration tool ... required to configure the Subscriber functionality in the device. The PubSubConfigurationDataType and the other configuration Structures defined in Clause 6 can be used to prepare an offline PubSub configuration that
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.5.1 General
  used by the Publisher to sign and encrypt NetworkMessages and by the Subscriber to verify the signature of NetworkMessages and to decrypt them. The SKS is responsible for managing ... central SKS to push the security keys for a SecurityGroup into a Publisher or Subscriber . The Method is exposed by Publishers or Subscribers that have no OPC UA Client functionality
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.5.3 Key acquisition handshakes
  acquisition handshakes The Publisher or Subscriber use keys provided by an SKS to secure messages exchanged via the Message Oriented Middleware . The handshake to pull the keys from ... Handshake used to pull keys from SKS To pull keys, the Publisher or Subscriber creates an encrypted connection and provides credentials that allow it access to the SecurityGroup . Then
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.6.2.2 Broker-less model with OPC UA UDP
  internal Variables can be configured through the DataSetReader Object and dispatcher in the Subscriber . The configuration of a DataSetReader defines how to decode the DataSetMessage to a DataSet . The SubscribedDataSet
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.6.3.1 General
  this model (partly depending on used Broker and its configuration) include: Publisher and Subscriber do not have to be directly addressable. They can be anywhere as long as they have ... list of Subscribers , multiple networks or even chained Brokers or scalable Brokers . Publisher and Subscriber lifetimes do not have to overlap. The Publisher application can push NetworkMessage
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  5.4.6.3.2 Broker-based model
  Broker is a messaging server (the OPC UA Publisher and the OPC UA Subscriber are messaging clients). The messaging protocols define how to connect to a messaging server and what ... Broker, or message security as end-to-end security between Publisher and Subscriber . The Broker level security requires all Publishers and Subscribers to have credentials that grant them access
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.1 Overview
  configuration parameters for the various PubSub components. They define the behaviour of Publisher and Subscriber . The parameters are grouped by component and are partitioned into 'common', 'message mapping', and 'transport ... sending on the Publisher side. These parameters need to be known on the Subscriber side to configure DataSetReaders and to filter and process DataSetMessages . Figure 20 - PubSub component overview Figure
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.3.1 Overview
  defined by the DataSetMetaData. This information is required for interoperability between Publisher and Subscriber . See 6.2.3.2 . The information source is only necessary for the configuration of the Publisher . The standard
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.3.2.2 DataTypeSchemaHeader
  array in the DataSetMetaData requires a change to the MajorVersion in the DataSetMetaData . The Subscriber must map namespace indices in received messages if the data is processed in the context ... other namespace indices in NodeIds and BrowseNames contained in the messages. If the Subscriber receives Structure DataTypes where the target Variables DataTypes have the same structure but different DataType NodeIds
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.3.2.6 ConfigurationVersionDataType
  content. The VersionTime DataType is defined in OPC 10000-4 . To assure interoperability, the Subscriber shall use DataSetMetaData for decoding with a majorVersion that matches the majorVersion in DataSetMessages sent
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.4.1 DataSetWriterId
  PublishedDataSet . It is used to select DataSetMessages for a PublishedDataSet on the Subscriber side. It shall be unique across all DataSetWriters for a PublisherId . All values, except
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.4.2 DataSetFieldContentMask
  Discovery The DataSetFieldContentMask defines different options that influence the information flow from Publisher to Subscriber in the case of a Bad Value Status or other error situations. Figure 24 depicts ... DataSetMessage creation on the Publisher side and the decoded DataSet field on the Subscriber side. The DataSetFieldContentMask controls the representation of the DataSet fields in a DataSetMessage . Figure 24 - PubSub
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.7.1 PublisherId
  only relevant for the Publisher functionality inside a PubSubConnection . The filter setting on the Subscriber side is contained in the DataSetReader parameters. Valid DataTypes are UInteger and String . A zero
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.9.4 DataSetMetaData
  options for retrieving the update of the DataSetMetaData are described in 5.2.3 . The Subscriber must map namespace indices in received messages if the data is processed in the context ... other namespace indices in NodeIds and BrowseNames contained in the messages. If the Subscriber receives Structure DataTypes where the target Variables DataTypes have the same structure but different DataType NodeIds
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.10.5 StandaloneSubscribedDataSetDataType
  human readable name. The name of the standalone SubscribedDataSet shall be unique in the Subscriber . DataSetFolder String[] Optional path of the SubscribedDataSet folder used to group SubscribedDataSets where each entry
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.11.1 Published data items
  configuration model defines different parameters that influence the information flow from Publisher to Subscriber in the case of a Bad Value Status or other error situations. Figure 25 depicts ... parameters and the information flow inside a Publisher and inside a Subscriber . The parameters and behaviour relevant for the encoding of a DataSetMessage on the Publisher side and the decoding
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.2.12.2 SecurityGroupDataType
  Error state and shall stop sending messages secured with the expired key. If a Subscriber receives messages for a key longer than two times the KeyLifetime it shall stop processing
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.3.1.1.1 Relationship of Timing parameters
  clock, this clock shall be used as the time base for the Publisher and Subscriber . The beginning of a PublishingInterval shall be a multiple of the PublishingInterval relative ... periodic publisher execution The different timing offsets inside a PublishingInterval cycle on Publisher and Subscriber side are shown in Figure 29 . The SamplingOffset and PublishingOffset are defined as parameters
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.3.1.4.7 PublishingInterval
  NetworkMessages related to the DataSet . The start time for the periodic execution of the Subscriber shall be calculated according
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.3.1.4.9 ProcessingOffset
  cycle when the received DataSet need to be processed by the application in the Subscriber . The different timing offsets inside a PublishingInterval cycle on the Publisher and Subscriber sides
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  6.4.2.5.5 MetaDataQueueName
  MetaDataQueueName For message mappings like UADP, the Subscriber needs access to the DataSetMetaData to process received DataSetMessages . The Publisher can provide the DataSetMetaData through a dedicated queue. The parameter MetaDataQueueName
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.1 General
  provide information that is not necessary for the processing of the messages on the Subscriber side. Other optional fields like PublisherId , DataSetWriterId or sizes of DataSetMessages are typically necessary ... processing of messages in generic Subscribers . If such fields are not present, the Subscriber must know the missing information from the DataSetReader configuration. One scenario is that a Publisher
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.3 Error handling
  them in NetworkMessages to the Subscribers and settings to process the DataSetMessages on the Subscriber side. The error handling for the status codes in DataSetMessage headers and DataSetMessage fields ... handling of information flows and status codes assumes that the configuration between Publisher and Subscriber is in sync. In several combinations of settings for the DataSetMessages and NetworkMessages , a Subscriber
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.4.2 NetworkMessage layout
  UADPFlags is false. If the field is omitted, the Subscriber shall handle the related bits as false. Bit range 0-2: PublisherId Type 000 The PublisherId is of DataType Byte ... ExtendedFlags1 is false. If the field is omitted, the Subscriber shall handle the related bits as false. Bit 0: Chunk message defined in in 7.2.4.4.4 . Bit 1: PromotedFields enabled
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.4.3.2 AES-CTR
  signature algorithm is specified by the SecurityPolicyUri in OPC 10000-7 . When a Subscriber or a Publisher receives a NetworkMessage , it shall verify the signature before processing the payload
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.4.4 UADP Chunk NetworkMessage
  identifies the PublishedDataSet and the DataSetWriter responsible for sending Messages for the DataSet . A Subscriber can skip DataSetMessages from DataSetWriters it does not expect DataSetMessages from. Table 159 - Chunked NetworkMessage ... previous payload was received. If the next sequence number is received by a Subscriber that can handle only one payload, the chunks of the previous payload are skipped if they
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.5.2 DataSet payload header
  identifies the PublishedDataSet and the DataSetWriter responsible for sending Messages for the DataSet . A Subscriber can skip DataSetMessages from DataSetWriters it does not expect DataSetMessages from
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.5.4 DataSetMessage header
  rest of this DataSetMessage is considered invalid, and shall not be processed by the Subscriber . Bit range 1-2: Field Encoding 00 The DataSet fields are encoded as Variant ... DataSetFlags1 is false. If the field is omitted, the Subscriber shall handle the related bits as false. Bit range 0-3: UADP DataSetMessage type 0000 Data Key Frame
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.5.5 Data Key Frame DataSetMessage
  part of the payload header, the DataSetMessage offset configuration is required on Subscriber side to identify a heartbeat DataSetMessage . Table 163 - Data Key Frame DataSetMessage structure Name Type Description FieldCount
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.6.1 General
  persist the latest announcement message for Subscribers . Discovery probe messages are sent from Subscriber to Publisher and they are limited to Message Oriented Middleware and protocol mappings that support such ... Oriented Middleware and the protocol mapping, it may be possible and required for the Subscriber to request discovery announcement messages by sending discovery probe messages. One use case
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.6.7 Status
  Operational . The NextReportTime indicates when the Publisher will send an update. If the Subscriber does not receive updates and the NextReportTime is in the past, the Subscriber assumes the PubSubState
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.4.6.12.2 Traffic reduction
  traffic on the network in the case of multicast or broadcast communication. A Subscriber should cache configuration information for PublisherId and DataSetWriterIds of interest. If a Subscriber requires information from ... shall be skipped if the information is already received during this time or another Subscriber sent already a probe and the announcement to this probe is used. A Subscriber shall
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.5.5.5 Status
  NextReportTime indicates when the Publisher is expected to send an update. If the Subscriber does not receive updates and the NextReportTime is a reasonable time in the past, the Subscriber
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.2.1 General
  address. OPC 10000-7 defines Profiles for different name resolution protocols that Publisher or Subscriber may support. For OPC UA UDP it is recommended to limit the MaxNetworkMessageSize plus additional
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.2.2 UDP multicast and broadcast
  multicast and broadcast communication is configured on a PubSubConnection for Publisher and Subscriber . The Address parameter for a PubSubConnection is defined in 6.2.7.3 . The Url field in the Address
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.2.3 UDP unicast
  unicast For UDP unicast, the address information for the Subscriber is configured on the PubSubConnection and the address information for the Publisher is configured on the WriterGroup . The receive port ... port are received through one PubSubConnection. The filtering and assignment of NetworkMessages for the Subscriber is done based on the PublisherId . The hostname for the Url in the PubSubConnection Address
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.2.4.1 General
  Pull Management or Push Management of certificates shall be supported by any Publisher or Subscriber that supports the DTLS Transport (see Part 12 for more information on the CertificateManager ). DTLS ... secure session prior to the PubSub data exchange. In this case either the Subscriber or the Publisher acts as the DTLS Client, with the other one acting as the DTLS
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.4.1 General
  messages. A Broker may persist messages so they can be delivered even if the Subscriber is not online. Brokers may also allow messages to be sent to multiple Subscribers ... mapping. No additional information is added to the meta data messages . MQTT Publisher and Subscriber transport profiles for full and minimal support are defined in OPC 10000-7 . Message security
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.4.7.1 General
  status of all Publishers in the "opcua" scope. This allows the Subscriber to detect when Publishers come online or disappear. opcua/json/metadata/# Subscribes to the metadata of all Publishers ... opcua" scope. This allows the Subscriber to detect changes to metadata. opcua/json/data/device-one/# Subscribes to all data produced by Publisher "device-one" in the "opcua" scope
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.4.7.2 MessageType mapping
  True Yes Defined in 7.3.4.7.11 . Table 205 - MQTT Topic level access permissions MqttMessageType Publisher Subscriber Description data Write Read Variables and Events from an OPC UA applications acting as Publisher ... Write Read connection Write Read action-request Read Write Publisher is the Responder and Subscriber is the Requestor . The topic with message type action-request is defined by the Responder
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.3.4.9.1 JSON message mapping
  Version 5.0 the MQTT ContentType property shall be set to application/json+gzip. If a Subscriber receives messages without MQTT ContentType from MQTT Version 3.1.1 Publishers it may require manual configuration
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  8.1 Overview
  defines the distribution framework for cryptographic keys used for message security. A Publisher or Subscriber can pull the keys from the SKS or the SKS can push the keys ... Publisher or Subscriber . The sequences for pull and push are described in 5.4.5.3 . The SKS can be a network service used to manage keys for all Publishers and Subscribers
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  8.3.2 GetSecurityKeys Method
  when to switch from one future key to the next future key. For a Subscriber the TimeToNextKey and KeyLifetime are used to calculate the time the Subscriber expects that ... latency, out of order delivery and the use of keys for several Publishers , a Subscriber needs to expect some overlap time where NetworkMessages are received that are using the previous
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  8.6.2 Behaviour
  call SetSecurityKeys to push the security keys for a SecurityGroup into a Publisher or Subscriber . The SKS shall push the previous security key, the current key, and at least
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.1 General
  transport settings for creating DataSetMessages for delivery through a Message Oriented Middleware . On the Subscriber side, a DataSetReader represents the transport settings for receiving DataSetMessages from a Message Oriented Middleware ... SubscribedDataSet represents the information to dispatch the received DataSets in the Subscriber . The configuration can be done through Methods or product-specific configuration tools. The DataSetFolderType can be used
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.2 Configuration behaviours
  based configuration tool to configure an OPC UA Server that is a Publisher and/or Subscriber . The latest configuration shall be persisted by the OPC UA Server and shall be available
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.3.3 SetSecurityKeys
  used to push the security keys for a SecurityGroup into a Publisher or Subscriber . It is used if Publisher or Subscriber have no OPC UA Client functionality. Encryption is required ... when to switch from one future key to the next future key. For a Subscriber the TimeToNextKey and KeyLifetime are used to calculate the time the Subscriber expects that
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.4.1 Overview
  made by product-specific configuration tools. The PublishedDataSetType defines the information necessary for a Subscriber to understand and decode DataSetMessages received from the Publisher for a DataSet and to detect
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.4.2.1 PublishedDataSetType
  Property DataSetMetaData provides the information necessary to decode DataSetMessages on the Subscriber side if the DataSetMessages are not self-describing. The information in this Property is automatically updated ... DataSetMessage needs to match the ConfigurationVersion of the DataSetMetaData available on the Subscriber side. The DataSetClassId is the globally unique identifier for a DataSetClass . The optional Property shall be present
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.8.2 DataSetReaderType
  SubscribedDataSetType defined in 9.1.9.1 describes the processing of the received DataSet in a Subscriber . Table 291 - DataSetReaderType definition Attribute Value BrowseName DataSetReaderType IsAbstract False References Node Class BrowseName DataType TypeDefinition
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.9.3 SubscribedDataSetMirrorType
  Variables. For each field of the DataSet a mirror Variable is created in the Subscriber AddressSpace . The SubscribedDataSetMirrorType is formally defined in Table 300 . Table 300 - SubscribedDataSetMirrorType definition Attribute Value ... FieldMetaData are created as Properties of the Variable . The DataTypes are created in the Subscriber from the DataSetMetaData if they do not exist. The NamespaceUri of the created DataTypes shall
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  9.1.9.5 StandaloneSubscribedDataSetType
  StandaloneSubscribedDataSetType This ObjectType represents a Subscriber defined standalone DataSet . A standalone subscribed DataSet can exist without DataSetReader and is used to define a DataSet from the Subscriber side. A DataSetReader ... SubscribedDataSetType defined in 9.1.9.1 describes the processing of the received DataSet in a Subscriber . The DataSetMetaData is defined in 6.2.9.4 . A Publisher must be configured to send DataSetMessages that comply
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  A.2.1.1 Motivation
  every PublishingInterval . When the message layout is the same in every PublishingInterval , and the Subscriber knows this in advance, several optimizations are possible: Both Publisher and the Subscriber ... varying size of DataSetMessages , which requires extra fields in the messages to allow the Subscriber to parse these messages. These extra fields can be omitted when the size
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  A.2.1.2 Overview
  messages with dynamic layout can be omitted (e.g. PayloadHeader or Sizes ). Finally, a Subscriber needs an easy way to verify that a received message matches the expected message layout. Fields ... distribute their DataSet s over more than one NetworkMessage , and the GroupVersion allows the Subscriber to verify the expected layout of the DataSetMessages and their DataSet fields
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  A.2.1.8 Example fixed message layout without security
  Payload Header ( Count and Sizes for the DataSetMessages and DataSetWriterIds ) is deactivated and the Subscriber has to retrieve this information through the DataSetMetaData , DataSetWriter and WriterGroup settings. The configuration ... DataSetMessages can be calculated from the DataSetMetaData . For DataSetMessage[0] in this example the Subscriber does not have to calculate the total length but it should take it from
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  B.3.1 General
  involved it may persist messages so they can be delivered even if the subscriber is not online. Brokers may also allow messages to be sent to multiple Subscribers. The AMQP ... Security with AMQP is primary provided by a TLS connection between the Publisher or Subscriber and the AMQP Broker , however, this requires that the AMQP Broker be trusted. For that
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  B.3.6 Transport Limits and Keep Alive
  capabilities of the OS or on the capabilities of the device the Publisher or Subscriber is running on, and can be made configurable through configuration model extensions or by other
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  C.3 Publish-Subscribe
  configured with what data to send. There is no connection establishment between Publisher and Subscriber . The identity of the Subscribers and the forwarding of published data to the Subscribers
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  C.4 Synergy of models
  Publisher will be an OPC UA Server (the owner of information) and a Subscriber is often an OPC UA Client . Above all, the PubSub Information Model for configuration
• OPC-10000-17 – OPC Unified Architecture - Part 17: Alias Names
  D.1.2 PubSub multicast messages
  those from a subset of Servers publishing on the same multicast address. A Subscriber when it is subscribed to the multicast address receives three types of messages, a data ... delta frame message and a keep alive message. The following illustrates the process a Subscriber could follow including what each of the message types provides: For a keep alive message
• OPC-10000-25 – OPC Unified Architecture - Part 25: Object Serialization
  A.5 Semantic Property Metadata in PubSub Scenarios
  well as to the MeasurementValueType Variables . The metadata can be conveyed to a PubSub Subscriber by coding this information into the Properties field of the FieldMetaData structure ... PubSub is configured accordingly, the information is available for the Subscriber through a DataSetMetaData Message . Figure A.5 - Semantic Properties in the FieldMetaData
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  5.5.6.2.2 Single Connection using unicast network messages
  FunctionalEntities located on the AutomationComponents A and B, each containing a Publisher , a Subscriber , and a single PubSubConnectionEndpoint . Both FunctionalEntities could be publishing data (bidirectional Connection ), or only one could
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  5.5.6.2.5 DataSetMetaData
  addition, the DataSetMetaData provides the details defining the contract between the Publisher and the Subscriber , including how to encode and decode the DataSetMessage . Thus, Subscribers must know about the PublishedDataSet ... NetworkMessage . Any mismatch between the transmitted version and the one configured at the Subscriber will cause the Subscriber to go into Error . To resolve the Error , the Subscriber needs
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.2.2 AutomationComponentType definition
  instance of this Object shall be provided. The optional SubscriberCapabilities provides the general Subscriber capabilities associated with this AutomationComponent . They apply to all instances in the FunctionalEntities Folder . An individual ... FunctionalEntity can further limit these capabilities. If an AutomationComponent supports being a Subscriber as defined in OPC 10000-14 , then an instance of this Object shall be provided. ComponentCapabilities
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.2.8 SubscriberCapabilitiesType
  SubscriberCapabilitiesType is a subtype of the BaseObjectType . It is used to contain the various Subscriber capabilities that can be supported. An instance of this ObjectType groups the capabilities ... ConformanceUnits UAFX AutomationComponent SubscriberCapabilities Base SupportedPublishingIntervals provides the intervals for publications, which this Subscriber is able to receive. An empty array indicates that no restrictions are defined by this instance
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.4.2 FunctionalEntityType definition
  AutomationComponent (or FunctionalEntity if defined in a sub- FunctionalEntity ). The optional SubscriberCapabilities provide the Subscriber capabilities associated with this FunctionalEntity . They also apply to all sub- FunctionalEntities of this FunctionalEntity
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.4.4 InputsFolderType
  optional SubscriberCapabilities shall only be present on InputData of the FunctionalEntity . It provides the Subscriber capabilities associated with the InputData and describes additional restrictions of the SubscriberCapabilities defined
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.4.7 FunctionalEntityCapabilitiesType
  heartbeat. The following connection types (see 5.5.1 ) support feedback: bidirectional, unidirectional with heartbeat, unidirectional Subscriber , and autonomous Subscriber . If FeedbackSignalRequired is missing or set to FALSE, the connection types unidirectional
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.6.3 PubSubConnectionEndpointType definition
  ToDataSetWriter Reference is required; there shall be no ToDataSetReader set. If Mode is Subscriber , a ToDataSetReader Reference is required; there shall be no ToDataSetWriter set. A PubSubConnectionEndpoint shall have ... Figure 31 . Figure 31 - Status with Mode of PublisherSubscriber For PubSubConnectionEndpoints with Mode of Subscriber , the Status shall be determined by the Status of the referenced DataSetReader according to Figure
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.12.2 ConnectionEndpointParameterType definition
  related to this preconfigured PublishedDataSet from the UA Publisher's exposed PubSub configuration. The Subscriber does not need to expose or utilise all variables that are being published. PreconfiguredSubscribedDataSet shall ... StandaloneSubscribedDataSet , but it may include additional data that is not required by the Subscriber
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.13.3.2 PubSubCommunicationFlowConfigurationType definition
  information flow can be linked with ConnectionEndpointConfiguration Objects to explicitly indicate the Publisher and Subscriber (s) of the information flow. The linkage is provided by ToOutboundFlow and ToInboundFlow References (defined ... represents instances of SubscriberConfigurationType . It defines the configuration of the information flow for the Subscriber (s). < SubscriberConfiguration> is omitted for an autonomous publisher
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  6.13.3.3 SubscriberConfigurationType definition
  SubscriberConfigurationType definition The SubscriberConfigurationType is formally defined in Table 99 . It describes the Subscriber -specific information for the Subscriber of an information flow. The configuration of the Subscriber requires additional ... specifies the network address to be used for the reception of NetworkMessages at the Subscriber of the information flow. This is an abstract type, and a concrete subtype shall
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  10.12 CommunicationFlowQosDataType
  True ReceiveQos 0:ReceiveQosDataType[] The ReceiveQos describes QoS category-related parameters for the Subscriber . This array shall be null or empty if no QoS-related parameters are required ... Subscriber is defined. For the defined parameters, see OPC 10000-14 . True The Communication FlowQosDataType representation in the AddressSpace is formally defined in Table 146 . Table 146 - CommunicationFlowQosDataType definition Attribute
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  D.3.7.5 Using ControlGroups to expose functionality.
  Controller B comes with preconfigured DataSets , one for the Publisher and one for the Subscriber . Figure D.31 - ControlGroup cascade Controller example ControlGroup can be created to indicate that if using
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.1.2 Single logical connection
  ToInboundFlow References . While an Object of type SubscriberConfigurationType (SubA, SubB) contains configuration for the Subscriber only, its parent PubSubCommunicationFlowConfigurationType Object contains configuration relevant for both the Publisher and Subscriber ... ServerA, and the configuration contained in SubB and Flow1 is for setting up the Subscriber on ServerB. Flow2 and SubA are used for setting up the Publisher and Subscriber
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.1.3.3 Multiple logical connections - multiple AutomationComponents
  have different settings for the MessageReceiveTimeout . EndpointB and EndpointC refer to their specific Subscriber configuration with ToInboundFlow . If EndpointB and EndpointC do not require different SubscriberConfigurations , both endpoints could also
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.4.7 PubSub DataSets
  options are self-described in the UADP PubSub communication protocol, allowing a Subscriber to handle a larger range of published messages. The UADP communication includes header information that describes ... that is returned in every message. The message only contains the values, so the Subscriber has to be aware of the order/mapping of Variables in the DataSet (see Figure E.18
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.5 Interaction with an SKS
  Publisher uses the current key to sign or sign and encrypt NetworkMessages , and Subscriber(s) to authenticate or authenticate and decrypt NetworkMessages. The past key, current key and a requested ... number of future keys are distributed from the SKS to the Publisher and the Subscriber(s) using the push or pull model. How past, current and future keys are stored
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  E.6.6 Loading / Saving ConnectionConfigurationSets
  this case, the PublishedDataSet or SubscribedDataSet describes Variables that are on the Publisher or Subscriber Server , which is very likely to be a different Server . Depending on how the ConnectionConfigurationSet
• OPC-10000-81 – OPC Unified Architecture - Part 81: UAFX Connecting Devices and Information Model
  F.1.8 SubscriberConfigurationConfDataType
  F.1.8 SubscriberConfigurationConfDataType This structure DataType describes the Subscriber -specific information for the Subscriber of an information flow. It is semantically equivalent to the SubscriberConfigurationType as defined in 6.13.3.3 . The SubscriberConfigurationConfDataType ... specifies the network address to be used for the reception of NetworkMessages at the Subscriber of the information flow. True MessageReceiveTimeout 0:Duration MessageReceiveTimeout specifies the maximum acceptable time between
• OPC-10000-84 – OPC Unified Architecture - Part 84: UAFX Profiles
  6.6.2.4 UAFX AutomationComponent Communication Subscriber Facet
  UAFX AutomationComponent Communication Subscriber Facet Table 18 describes the details of the UAFX AutomationComponent Communication Subscriber Facet. This Facet includes the functionality needed for a UAFX Subscriber . Table 18 - UAFX ... AutomationComponent Communication Subscriber Facet Group Conformance Unit / Profile Title Optional UAFX AutomationComponent UAFX AutomationComponent SubscriberCapabilities Base False UAFX AutomationComponent UAFX AutomationComponent AutomationComponent PubSub Connections False UAFX AutomationComponent UAFX AutomationComponent SubscriberCapabilities
• OPC-10000-84 – OPC Unified Architecture - Part 84: UAFX Profiles
  6.6.4.4 UAFX SubscriberConfiguration Facet
  UAFX SubscriberConfiguration Facet. This Facet includes the information required for configuring the Subscriber of an information flow in the ConnectionManager Information Model . Table 43 - UAFX SubscriberConfiguration Facet Group Conformance Unit