opcua

Create OPC UA client object

Syntax

UaClient = opcua(ServerInfoObj)

UaClient = opcua(ServerUrl)

UaClient = opcua(Hostname,Portnum)

Description

UaClient = opcua(ServerInfoObj) creates an OPC UA client associated with the server specified by ServerInfoObj. You can create server objects with the opcuaserverinfo function.

UaClient = opcua(ServerUrl) creates a client associated with the server referenced by the URL specified in ServerUrl.

UaClient = opcua(Hostname,Portnum) creates an OPC UA client object associated with the server at port Portnum on the host identified by Hostname.

By default, the client attempts to retrieve available connection configurations (called Endpoints) from the server and chooses the most secure possible security settings from those configurations. If the attempt to retrieve endpoints fails, an error is generated. You can override the default settings by using setSecurityModel to change the MessageSecurityMode or ChannelSecurityPolicy settings.

Examples

Create OPC UA Clients

Create a client for the first server found on the local host.

S = opcuaserverinfo('localhost');
UaClient = opcua(S(1));

Create a client for the server at port 53530 on the local host.

UaClient = opcua('localhost',53530)

UaClient = 

OPC UA Client:

   Server Information:
                     Name: 'SimulationServer@localhost'
                 Hostname: 'localhost'
                     Port: 53530
              EndpointUrl: 'opc.tcp://localhost:53530/OPCUA/SimulationServer'

   Connection Information:
                  Timeout: 10
                   Status: 'Disconnected'
              ServerState: '<Not connected>'

   Security Information:
      MessageSecurityMode: SignAndEncrypt
    ChannelSecurityPolicy: Aes256_Sha256_RsaPss
                Endpoints: [1×11 opc.ua.EndpointDescription]

Create a client using the Discovery URL of the server.

uaClient = opc.ua.Client('opc.tcp://localhost:53530/OPCUA/SimulationServer');

Input Arguments

ServerInfoObj — OPC UA server

OPC UA server object

OPC UA server, specified as an OPC UA server object.

Data Types: object

ServerUrl — OPC UA server URL

char | string

OPC UA server URL, specified as a character vector or string. The server URL must use the opc.tcp protocol; OPC Toolbox™ does not support http or https connections.

Data Types: char | string

Hostname — Server host name or IP address

char | string

Server host name or IP address, specified as a character vector or string. A host name can be short or a fully qualified domain name.

Example: 'localhost'

Data Types: char | string

Portnum — Server host port number

numeric

Server host port number, specified as a numeric value.

Example: 5000

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64

Output Arguments

UaClient — OPC UA client

opc.ua.Client object

OPC UA client, returned as an opc.ua.Client object, with the following properties.

Property	Description
Hostname	Server host name or IP address
Port	Port number used for TCP/IP connections to the server
Name	Server description
Timeout	Time to wait for all operations on the server to complete
EndpointUrl	URL to use for connection to the server
Namespace	Server namespace nodes
UserData	Free-form container for user-defined data to associate with the client
MinSampleRate	Minimum sample rate in seconds that the server can generally support
AggregateFunctions	List of aggregate functions supported by this server
MaxHistoryValuesPerNode	Maximum history values returned per node in historical read operations
MaxHistoryReadNodes	Maximum number of nodes supported by historical read operations
MaxReadNodes	Maximum number of nodes supported per read operation
MaxWriteNodes	Maximum number of nodes supported per write operation
MessageSecurityMode	Message security mode specified for connection
ChannelSecurityPolicy	Channel security policy specified for connection
UserAuthTypes	User authentication types supported by server