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▼OPC Introduction	This part of the documentation contains general information about the OPC Foundation, provides an introduction to the classic OPC specifications and gives a detailed introduction to OPC Unified Architecture
Introduction to Classic OPC
Motivation for OPC UA
Introduction to OPC UA
OPC UA Specifications
OPC UA Software Layers
▼OPC UA Fundamentals
OPC Unified Architecture Overview	The Address Space Model in UA Part 3 specifies the building blocks to expose instance and type information and thus the OPC UA meta model used to describe and expose information models and to build an OPC UA server address space
Address Space Concepts
OPC UA Node Classes
OPC UA NodeId Concepts
OPC UA Subscription Concept
Discovery and Security Configuration
▼OPC UA Information Models
▼Base Model
Object Types
Event Types
Data Types
Variable Types
Service Related Data Types
▼Data Access
Data Types
Variable Types
▼Alarms and Conditions
Object Types
Event Types
▼Condition Types
ConditionType	Reference NodeClass BrowseName DataType ValueRank TypeDefinition ModellingRule HasSupertype ObjectType BaseEventType   HasComponent Method AddComment Mandatory HasProperty Variable BranchId NodeId Scalar PropertyType Mandatory HasProperty Variable ClientUserId String Scalar PropertyType Mandatory HasComponent Variable Comment LocalizedText Scalar ConditionVariableType Mandatory HasProperty Variable ConditionClassId NodeId Scalar PropertyType Mandatory HasProperty Variable ConditionClassName LocalizedText Scalar PropertyType Mandatory HasProperty Variable ConditionName String Scalar PropertyType Mandatory HasComponent Method ConditionRefresh None HasComponent Method ConditionRefresh2 None HasComponent Method Disable Mandatory HasComponent Method Enable Mandatory HasComponent Variable EnabledState LocalizedText Scalar TwoStateVariableType Mandatory HasComponent Variable LastSeverity UInt16 Scalar ConditionVariableType Mandatory HasComponent Variable Quality StatusCode Scalar ConditionVariableType Mandatory HasProperty Variable Retain Boolean Scalar PropertyType Mandatory
DialogConditionType	Reference NodeClass BrowseName DataType ValueRank TypeDefinition ModellingRule HasSupertype ObjectType ConditionType   HasProperty Variable CancelResponse Int32 Scalar PropertyType Mandatory HasProperty Variable DefaultResponse Int32 Scalar PropertyType Mandatory HasComponent Variable DialogState LocalizedText Scalar TwoStateVariableType Mandatory HasComponent Variable EnabledState LocalizedText Scalar TwoStateVariableType Mandatory HasProperty Variable LastResponse Int32 Scalar PropertyType Mandatory HasProperty Variable OkResponse Int32 Scalar PropertyType Mandatory HasProperty Variable Prompt LocalizedText Scalar PropertyType Mandatory HasComponent Method Respond Mandatory HasProperty Variable ResponseOptionSet LocalizedText OneDimension PropertyType Mandatory
AcknowledgeableConditionType	Reference NodeClass BrowseName DataType ValueRank TypeDefinition ModellingRule HasSupertype ObjectType ConditionType   HasComponent Variable AckedState LocalizedText Scalar TwoStateVariableType Mandatory HasComponent Method Acknowledge Mandatory HasComponent Method Confirm Optional HasComponent Variable ConfirmedState LocalizedText Scalar TwoStateVariableType Optional HasComponent Variable EnabledState LocalizedText Scalar TwoStateVariableType Mandatory
AlarmConditionType	Reference NodeClass BrowseName DataType ValueRank TypeDefinition ModellingRule HasSupertype ObjectType AcknowledgeableConditionType   HasComponent Variable ActiveState LocalizedText Scalar TwoStateVariableType Mandatory HasComponent Variable EnabledState LocalizedText Scalar TwoStateVariableType Mandatory HasProperty Variable InputNode NodeId Scalar PropertyType Mandatory HasProperty Variable MaxTimeShelved Duration Scalar PropertyType Optional HasComponent Object ShelvingState ShelvedStateMachineType Optional HasProperty Variable SuppressedOrShelved Boolean Scalar PropertyType Mandatory HasComponent Variable SuppressedState LocalizedText Scalar TwoStateVariableType Optional
Variable Types
▼Historical Access
Object Types
Event Types
Data Types
▼Certificate Management
Object Types
Event Types
Data Types
▼SDK Architecture
▼SDK Platform Layer Architecture	This SDK platform layer consists of several modules, where only the platform module encapsulates general operating system functions
Memory	The SDK provides two kinds of memory
IPC	The High Performance SDK provides its own IPC (Inter Process Communication) framework
Platform Module	The platform layer module is the basis for all other code
Network Module
Timer Module	The SDK needs timers in several places like periodic sampling of data, subscription handling, etc
Crypto Module
PKI Module
PKI Store Module
Trace Module	The trace module is important for analyzing problems
Address Space	One of the biggest challenges of OPC UA for embedded devices is the memory consumption of the huge server address space
Address Space Generation
Provider Architecture
Authentication
Authorization
SDK Porting Guide
▼Examples and Tutorials
▼Server Getting Started
▼Lesson 1: Setting up an OPC UA Server Console Application	This lesson will guide you through the process of setting up a basic OPC UA Server console application
►Files
CMakeLists.txt
server_main.c
▼Lesson 2: Custom Provider with Value Stores	This lesson explains how to create a custom provider to extend the address space and serve values using value stores
►Files
CMakeLists.txt
custom_provider.h
custom_provider.c
custom_provider_nodes.h
custom_provider_nodes.c
custom_provider_store.h
custom_provider_store.c
server_main.c
▼Lesson 3: Creating Methods	This lesson explains how to implement own methods
►Files
CMakeLists.txt
custom_provider.h
custom_provider.c
custom_provider_nodes.h
custom_provider_nodes.c
custom_provider_store.h
custom_provider_store.c
custom_provider_method.h
custom_provider_method.c
server_main.c
▼Accessing Asynchronous Data	This lesson explains how to implement access to data from a asynchronously connnected device
►Files
CMakeLists.txt
custom_provider.h
custom_provider.c
custom_provider_nodes.h
custom_provider_nodes.c
custom_provider_read.h
custom_provider_read.c
custom_provider_write.h
custom_provider_write.c
custom_provider_subscription.h
custom_provider_subscription.c
server_main.c
▼Minimal Server	This is an example of a minimal OPC UA server with very small memory footprint
▼Files
CMakeLists.txt
server_main.c
appconfig.c
cert_data.c
provider_minimal.h
provider_minimal.c
Sensor Model Server	This example shows how to create an address space from a binary address space file containing some types and how to create instances from these types at runtime
History Example Server
▼Client Getting Started
▼Lesson 1: Setting up an OPC UA Client Console Application	This lesson will guide you through the process of setting up a basic OPC UA Client console application
►Files
CMakeLists.txt
sampleclient.h
sampleclient.c
main.c
▼HP SDK Sample Client	The HP SDK Sample Client is a collection of examples for developing different features of an OPC UA client
▼Files
main.c
client_settings.conf
Troubleshooting
Documentation	The documentation contains by default only documentation needed as a user of the SDK
OPC UA Binary File Format