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OPC UA connection established only afert second attempt
December 17, 2021
11:31, EET
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gerstale
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November 26, 2019
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Hello,

during the tests we have recognized that the connection between OPC UA client and server will be established only after second attempt. Both OPC UA server and client based on prosys-opc-ua-sdk-for-java-4.6.2-1636. Could you please explain, what is the reason for this? and how to avoid it?

Server logging:
[OPC-UA-Stack-Non-Blocking-Work-Executor-2] INFO com.prosysopc.ua.stack.transport.tcp.nio.OpcTcpServer – OpcTcpServer(opc.tcp(/172.21.144.1:12686)): /192.168.178.240:10422 connected
[OPC-UA-Stack-Blocking-Work-Executor-1] INFO com.prosysopc.ua.stack.transport.tcp.nio.OpcTcpServerSecureChannel – SecureChannel opened; SecurityToken(Id=1, secureChannelId=1, creationTime=17.12.2021, 10:16:34, lifetime=3600000)
[OPC-UA-Stack-Async-Selector] INFO com.prosysopc.ua.stack.utils.asyncsocket.AsyncSocketImpl – AsyncSocketInputStream.close(): unexpected untriggered monitor
[OPC-UA-Stack-Async-Selector] INFO com.prosysopc.ua.stack.transport.tcp.nio.OpcTcpServerSecureChannel – Secure Channel closed, token=SecurityToken(Id=1, secureChannelId=1, creationTime=17.12.2021, 10:16:34, lifetime=3600000)
[OPC-UA-Stack-Async-Selector] INFO com.prosysopc.ua.stack.transport.endpoint.AbstractServerSecureChannel – Channel closed: Id=1
[OPC-UA-Stack-Non-Blocking-Work-Executor-6] INFO com.prosysopc.ua.stack.transport.tcp.nio.OpcTcpServer – OpcTcpServer(opc.tcp(/172.21.144.1:12686)): /192.168.178.240:10424 connected
[OPC-UA-Stack-Blocking-Work-Executor-4] INFO com.prosysopc.ua.stack.transport.tcp.nio.OpcTcpServerSecureChannel – SecureChannel opened; SecurityToken(Id=1, secureChannelId=2, creationTime=17.12.2021, 10:16:34, lifetime=3600000)
[OPC-UA-Stack-Blocking-Work-Executor-5] INFO com.prosysopc.ua.server.SessionManager – Session created: d77d10c3-b110-4c61-a72e-b188409b3754-48E537BD (ID=ns=1;g=8579f040-0625-4b8a-b2a6-4745708fbf71 Token=b=OA27rqg61gWm2w0bICHgs3Ybro4x6+21+a37eWay/7k= Channel=(SecureChannelId=2 State=Open URL=opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer SecurityPolicy=http://opcfoundation.org/UA/SecurityPolicy#None RemoteAddress=/192.168.178.240:10424))
[OPC-UA-Stack-Blocking-Work-Executor-7] INFO com.prosysopc.ua.samples.server.TestServer – onValidate: userIdentity=Type=Anonymous

Client logging:
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – /192.168.178.22:12686 Connecting
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – Connected (non-reverse), handshake completed, local=/192.168.178.240:10422, remote=/192.168.178.22:12686
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.SecureChannelTcp – 1 Closed
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – /192.168.178.22:12686 Closed
[TcpConnection/Read] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – /192.168.178.22:12686 Closed (expected)
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – /192.168.178.22:12686 Connecting
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.stack.transport.tcp.io.TcpConnection – Connected (non-reverse), handshake completed, local=/192.168.178.240:10424, remote=/192.168.178.22:12686
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.client.UaClient – Using OperationLimits [maxMonitoredItemsPerCall=10000, maxNodesPerBrowse=10000, maxNodesPerHistoryReadData=10000, maxNodesPerHistoryReadEvents=10000, maxNodesPerHistoryUpdateData=10000, maxNodesPerHistoryUpdateEvents=10000, maxNodesPerMethodCall=10000, maxNodesPerNodeManagement=10000, maxNodesPerRead=10000, maxNodesPerRegisterNodes=10000, maxNodesPerTranslateBrowsePathsToNodeIds=10000, maxNodesPerWrite=10000]
[OpcUaClientCommunicationManager_0_opc.tcp://192.168.178.22:12686/OPCUA/SampleConsoleServer_8] INFO com.prosysopc.ua.typedictionary.TypeDictionary – TypeDictionary initialized successfully

December 17, 2021
13:37, EET
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Bjarne Boström
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April 3, 2012
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Hi,

This is normal, read: https://reference.opcfoundation.org/Core/docs/Part4/5.4.1/

Basically on the first connection we do OpenSecureChannel + GetEndpoints https://reference.opcfoundation.org/Core/docs/Part4/5.4.4/ to obtain the EndpointDescription (the channel is the closed)

Then a second connection is opened with OpenSecureChannel and then CreateSession, ActivateSession etc. follows. The GetEndpoints (the first connection) per spec happens without security thus a second one is needed for the selected security mode as the security mode of the OpenSecureChannel cannot be changed once done.

Theoretically you can skip the first connection if you somehow magically have the EndpointDescription already. It can be set to UaClient.setEndpoint(EndpointDescription endpoint) before calling connect. Though, obtaining that pretty much requires you do do the GetEndpoints; it contents must be exactly as-if you would have received it from the server.

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