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59 result(s) for Messages

• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  2.1.7 Client
  Client software application that sends Messages to OPC UA Servers conforming to the Services specified in this set of specifications
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  4.4.1.2 Discovery and Session establishment
  active for the duration of the application Session and ensures the integrity of all Messages that are exchanged. This means users need to be authenticated only once, when the application
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  4.4.1.4 Transport security
  service capable platforms. Transport level security can be used to encrypt and sign Messages . Encryption and signatures protect against disclosure of information and protect the integrity of Messages . Encryption capabilities ... provided by the underlying communications technology used to exchange Messages between OPC UA Applications . OPC 10000-7 defines the encryption and signature algorithms to be used for a given Profile
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  4.4.4 Integrated services
  occurrences such as Alarms , data value changes, Events , and Program execution results. OPC UA Messages may be encoded as text (XML or JSON) or in binary format for efficiency purposes
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.2 OPC UA Clients
  responses from Servers . The Communication Stack handles the conversion of Client API calls into messages and manages the underlying communication with the Server . The Services defined ... Communication Stack. The OPC UA Communication Stack converts Client API calls into Messages and sends them through the underlying communications entity to the Server at the request of the Client
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.3.3 Server application
  Server . It uses the Server API to send and receive OPC UA Messages from Clients . Note that the " Server API" is an internal interface that isolates the Server
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  5.3.5.2 Subscriptions
  Notifications to Clients . Clients control the rate at which publishing occurs by sending Publish Messages
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  6.3 SecureChannel Service Set
  used to open a communication channel that ensures the confidentiality and integrity of all Messages exchanged with the Server . The base concepts for UA security are defined ... only to the Client and Server and that are used to authenticate and encrypt Messages sent across the network. The SecureChannel Services allow the Client and Server to securely negotiate
• OPC-10000-1 – OPC Unified Architecture - Part 1: Overview and Concepts
  6.10 Subscription Service Set
  Subscription are 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 ... missed a Message , it can request the Server to resend one or more Messages
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  4.3.2.2 Message flooding
  Server 's resources. For PubSub , an attacker can send a large volume of dataset messages with the goal of overwhelming the subscriber, the middleware or dependent components such ... Client - Server, PubSub message flooding attacks can use both well-formed and malformed Messages . For well-formed Messages , the attacker could be one in which the publisher
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.1.4 Message spoofing
  PubSub counters Message spoofing threats by providing the ability to sign messages. Messages can also contain a valid PublisherId , DataSetClassId , timestamp information, network message number and sequence number, which further
• OPC-10000-2 – OPC Unified Architecture - Part 2: Security Model
  5.1.6 Message replay
  Session includes the same signature, timestamps and sequence number that are part of all messages and thus cannot be replayed. OPC UA PubSub uses PublisherIds , DataSetWriterIds , Timestamps , network message numbers ... sequence numbers in published messages. When Messages are optionally signed they cannot be changed without detection, therefore it can be configured that replay of a message is not possible
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  4.1 Service Set model
  Client to establish a communication channel to ensure the Confidentiality and Integrity of Messages exchanged with the Server . Figure 2 - SecureChannel Service Set The Session Service Set , illustrated in Figure ... MonitoredItems to the Client . Subscription Services also provide for Client recovery from missed Messages and communication failures. Figure 8 - MonitoredItem and Subscription Service Sets
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  4.2 Request/response Service procedures
  make use of the API of a Communication Stack to construct and interpret Messages and to access the requested operation. The implementation of each service request or response handling shall
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.6.1 Overview
  used to open a communication channel that ensures the Confidentiality and Integrity of all Messages exchanged with the Server . The base concepts for OPC UA security are defined ... known only to the Client and Server , which are used to sign and encrypt Messages sent across the network to ensure Confidentiality and Integrity . The SecureChannel Services allow the Client
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.6.2.1 Description
  This Service requires the Communication Stack to apply the various security algorithms to the Messages as they are sent and received. Specific implementations of this Service for different Communication Stacks ... that identify a set of cryptography keys that are used to encrypt and authenticate Messages . SecurityTokens also have globally-unique identifiers which are attached to each Message secured with
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.6.2.2 Parameters
  concrete DataType . securityMode Enum MessageSecurityMode The type of security to apply to the messages. The type MessageSecurityMode type is defined in 7.20 . A SecureChannel may need to be created even ... securityPolicyUri String The URI for SecurityPolicy to use when securing messages sent over the SecureChannel . The set of known URIs and the S ecurityPolicies associated with them are defined
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.6.3.1 Description
  Description This Service is used to terminate a SecureChannel . The request Messages shall be signed with the appropriate key associated with the current token for the SecureChannel
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.7.2.1 Description
  shall create a SecureChannel with the OpenSecureChannel Service to ensure the Integrity of all Messages exchanged during a Session . This SecureChannel has a unique identifier which the Server shall associate ... audit log shall provide the information in the audit log entries via event Messages defined in this document. The Server may choose to only provide the Audit information via event
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.14.1.1 Description
  cycle. NotificationMessages are uniquely identified by sequence numbers that enable Clients to detect missed Messages . The publishing interval also defines the default sampling interval for its MonitoredItems . Subscriptions have ... Client . However, the Subscription continues to execute cyclically and continues to send keep-alive Messages to the Client . Subscriptions have a lifetime counter that counts the number of consecutive publishing
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.14.4.2 Parameters
  MonitoredItems . Setting this value to FALSE does not discontinue the sending of keep-alive Messages . subscriptionIds [] IntegerId List of Server -assigned identifiers for the Subscriptions to enable or disable
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  5.14.7.1 Description
  numbers of the NotificationMessages that are available for retransmission. The Client should acknowledge all Messages in this list for which it will not request retransmission. If the Server transfers
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.1.4 Creating a SecureChannel
  both applications have access to Certificates that can be used to encrypt and sign Messages exchange. The ApplicationInstanceCertificates installed by following the process described in 6.1.2 may be used ... CreateSession response . The exact mechanisms for using the SecurityToken to sign and encrypt Messages exchanged over the SecureChannel are described in OPC 10000-6 . The process for renewing tokens
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.3.1 Description
  assume an anonymous user. In this case the authenticationToken shall be null. The SessionlessInvoke Messages are just an envelope for the Service to invoke and do not have a RequestHeader
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.5.3 General audit Events
  Server that maintains an audit log shall provide the audit log entries via Event Messages . The AuditEventType and its sub-types are defined in OPC 10000-3 . An audit Event
• OPC-10000-4 – OPC Unified Architecture - Part 4: Services
  6.5.10 Auditing for View, Query, MonitoredItem and Subscription Service Set
  Service Set . In general, these services will not generate audit entries or audit Event Messages . The TransferSubscriptions Service shall generate an audit Event of type AuditSessionEventType or subtypes
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  3.1.9 SecurityProtocol
  SecurityProtocol Protocol which ensures the integrity and privacy of UA Messages that are exchanged between OPC UA applications
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  3.1.12 TransportProtocol
  TransportProtocol way to exchange serialized OPC UA Messages between OPC UA applications
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  4 Overview
  communication between OPC UA applications is based on the exchange of Messages . The parameters contained in the Messages are defined in OPC 10000-4 ; however, their format is specified
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.1 Overview
  Binary, OPC UA XML and OPC UA JSON. It describes how to construct Messages using each of these encodings
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.2 Built-in Types
  types. These built-in types are then used to construct structures, arrays and Messages . The built-in types are described in Table 1 . Table 1 - Built-in Data Types
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.9 Variant
  contain DataValue when used in other contexts such as Method Arguments or PubSub Messages . The Variant in a DataValue cannot, directly or indirectly, contain another DataValue . ExtensionObjects and Variants allow
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.1.15 Messages
  Messages Messages are the top-level Structures exchanged between a Client and Server . A Message sent from a Client to a Server is a Request . A Message sent back ... ServerState over and over) increases the attack surface. To reduce the attack surface, any Messages can include random data inserted into the AdditionalHeader field of the RequestHeader or ResponseHeader
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.2.9 Messages
  Messages Messages are Structures encoded as sequence of bytes prefixed by the NodeId of for the OPC UA Binary DataTypeEncoding defined for the Message . Each OPC UA Service described
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.3.3 Enumerations
  Enumerations Enumerations that are used as parameters in the Messages defined in OPC 10000-4 are encoded as xs:string with the following syntax: <symbol>_<value
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.3.8 Messages
  Messages Messages are encoded as an xs: complexType. The parameters in each Message are serialized in the same way the fields of a Structure are serialized
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  5.4.9 Messages
  Messages Messages are encoded as ExtensionObjects
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.1 Security Handshake and Security Policies
  These Services specify how to establish a SecureChannel and how to apply security to Messages exchanged over that SecureChannel . The Messages exchanged and the security algorithms applied to them ... algorithm is used. The KeyDerivationAlgorithm is used to create the keys used to secure Messages sent over the SecureChannel . The length of the keys used for encryption is implied
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.1 Overview
  Overview OPC UA Secure Conversation (UASC) allows secure communication using binary encoded Messages . UASC is designed to operate with different TransportProtocols that may have limited buffer sizes. For this reason ... Secure Conversation will break OPC UA Messages into several pieces (called ' MessageChunks' ) that are smaller than the buffer size allowed by the TransportProtocol . UASC requires a TransportProtocol buffer size that
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.2.3 Security Header
  algorithms is defined in Table 58 . Asymmetric algorithms are used to secure the OpenSecureChannel Messages . PKCS #1 defines a set of asymmetric algorithms that may be used by UASC implementations
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.4 Establishing a SecureChannel
  Establishing a SecureChannel Most Messages require a SecureChannel to be established. A Client does this by sending an OpenSecureChannel request to the Server . The Server shall validate the Message ... Message from the Server secured with the new SecurityToken . The Client shall send a Messages secured with new SecurityToken as soon as it finishes processing the OpenSecureChannel response. The Client
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.6 Deriving keys
  Deriving keys Once the SecureChannel is established the Messages are signed and encrypted with keys derived from the Nonces exchanged in the OpenSecureChannel call. These keys are derived by passing ... calculation of offsets and lengths. The Client keys are used to secure Messages sent by the Client . The Server keys are used to secure Messages sent by the Server
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.7.7 Verifying Message Security
  This value may be 0 if the Message is an OpenSecureChannel request. For other Messages, it shall report a Bad_SecureChannelUnknown error if the SecureChannelId is not recognized ... encountered. Stacks that implement UASC shall have a mechanism to log errors when invalid Messages are discarded. This mechanism is intended for developers, systems integrators and administrators to debug network
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  6.8.1 Secure Channel Handshake
  Clause 6.7.4 specifies the contents of the OpenSecureChannel request and response messages. When using an ECC SecurityPolicy the ClientNonce is the Public Key for the Client's EphemeralKey encoded using ... which normally requires the previous Message to be decrypted. If the receiver processes incoming Messages in parallel it can calculate the expected SequenceNumber based on the order in which
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.2.1 Overview
  Secure Conversation mapping (see 6.7 ) relate to the OPC UA Connection Protocol Messages . Figure 18 - OPC UA Connection Protocol Message structure
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.2.2 Message Header
  Table 57 . This allows the OPC UA Connection Protocol layer to extract the SecureChannel Messages from the incoming stream even if it does not understand their contents
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.2.3 Hello Message
  ResponseTooLarge Error Message if a response Message exceeds this value. The mechanism for aborting Messages is described fully in 6.7.3 . A value of zero indicates that the Client ... endpoint would connect to the Server identified by the EndpointUrl and would forward all Messages to the Server via this socket. If one socket closes, then the proxy shall close
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.2.4 Acknowledge Message
  Message . If the Client accepts the protocol version it shall ensure that it sends Messages that conform to this version. The ProtocolVersion for this version of the standard ... RequestTooLarge StatusCode if a request Message exceeds this value. The mechanism for aborting Messages is described fully in 6.7.3 . A value of zero indicates that the Server has no limit
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.3 Establishing a connection
  SecureChannel layer. The negotiated SendBufferSize specifies the size of the MessageChunks to use for Messages sent over the connection. If the Server creates the TransportConnection the first Message shall ... Server which starts the buffer negotiation described for the Client initiated connection. The Hello/Acknowledge Messages are only sent once. If they are received again the receiver shall report an error
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.1.4 Closing a connection
  then the Server shall report the error and close the socket. The sequence of Messages when closing an OPC UA Connection Protocol connection is shown in Figure 21 . Figure
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.4.1 Overview
  Overview HTTPS refers HTTP Messages exchanged over a TLS connection (see HTTPS ). The syntax of the HTTP Messages does not change and the only difference is a TLS connection ... underlying transport. The opc prefix specifies that the endpoint accepts OPC UA messages as defined in this document
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.4.3 XML Encoding
  SOAP request-response message pattern over an HTTPS connection. The body of the HTTP Messages shall be a SOAP 1.2 Message (see SOAP Part 1 ). WS-Addressing headers are optional
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.4.4 Binary Encoding
  Encoding This TransportProtocol implements the OPC UA Services using an OPC UA Binary encoded Messages exchanged over an HTTPS connection. Applications which support the HTTPS Profile shall support HTTP ... body of the HTTP Messages shall be encoding using the OPC UA Binary DataEncoding . The Content-Type shall be "application/octet-stream". An example HTTP request header is: POST /UA/SampleServer
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  7.4.5 JSON Encoding
  JSON Encoding This TransportProtocol implements the OPC UA Services using JSON encoded Messages exchanged over an HTTPS connection. Applications which support the HTTPS Profile shall support HTTP 1.1. The body ... HTTP Messages shall be encoded using the OPC UA JSON DataEncoding and the Content-Type shall be 'application/json'. If the message is compressed the Content-Encoding shall be 'gzip
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  8.1 OPC Binary Schema
  Binary Schema The normative contract for the OPC UA Binary Encoded Messages is an OPC Binary Schema. This file defines the structure of all types and Messages . The syntax
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  8.2 XML Schema and WSDL
  Schema and WSDL The normative contract for the OPC UA XML encoded Messages is an XML Schema. This file defines the structure of all types and Messages . This schema captures ... TransportProtocol is a WSDL that includes XML Schema for the OPC UA XML encoded Messages . It also defines the port types for OPC UA Servers and DiscoveryServers . Links
• OPC-10000-6 – OPC Unified Architecture - Part 6: Mappings
  D.1 XML Schema
  Schema Clause D.1 defines the XML Schema for all DataTypes and Messages defined in the OPC UA namespace The XML Schema released with this version of this document
• OPC-10000-14 – OPC Unified Architecture - Part 14: PubSub
  7.2.5.3 NetworkMessage containing DataSetMessages
  DataSetClassId on the PublishedDataSet (see 6.2.3.3 ) associated with the DataSetWriters that produced the DataSetMessages. Messages * A JSON array of JSON DataSetMessage s (see 7.2.5.4 ) or a JSON object if SingleDataSetMessage ... NetworkMessageContentMask is not set, the NetworkMessage is the contents of the Messages field (e.g. a JSON array of DataSetMessages ). If the DataSetMessageHeader bit of the NetworkMessageContentMask
• OPC-10000-15 – OPC Unified Architecture - Part 15: Safety
  6.2.2.1 SafetyACSet Object
  PubSub context, both requests and responses are realized by repeatedly publishing and subscribing Messages , see Figure 14 . [RQ6.4] For diagnostic purposes, the SPDUs received and sent shall be accessible