First of all: I'm a newbie to OPCUA. :)
I'm trying to connect an Milo Client to our Server but don't really understand whats going wrong. The sample Client and Server work fine together, but when I try to connect the client sample with one of the public OPC-UA-Test-Servers I get those exceptions:
15:48:34.729 [ua-netty-event-loop-0] DEBUG org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler - Sent Hello message on channel=[id: 0xc22800c2, L:/10.22.19.217:58947 - R:opcua.demo-this.com/52.233.134.134:51210]. 15:48:34.729 [ua-netty-event-loop-0] WARN io.netty.channel.DefaultChannelPipeline - An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception. java.io.IOException: An existing connection was forcibly closed by the remote host at sun.nio.ch.SocketDispatcher.read0(Native Method) at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:43) at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) at sun.nio.ch.IOUtil.read(IOUtil.java:192) at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380) at io.netty.buffer.PooledUnsafeDirectByteBuf.setBytes(PooledUnsafeDirectByteBuf.java:221) at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:898) at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:242) at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:119) at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528) at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:485) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:399) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:371) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) at java.lang.Thread.run(Thread.java:745) 15:48:39.612 [ForkJoinPool.commonPool-worker-1] DEBUG org.eclipse.milo.opcua.stack.client.ClientChannelManager - Channel bootstrap failed: timed out waiting for acknowledge org.eclipse.milo.opcua.stack.core.UaException: timed out waiting for acknowledge at org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler.lambda$startHelloTimeout$4(UaTcpClientAcknowledgeHandler.java:156) at org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler$$Lambda$27/469017260.run(Unknown Source) at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:581) at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:655) at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:367) at java.lang.Thread.run(Thread.java:745) 15:48:39.613 [main] ERROR org.eclipse.milo.examples.client.ClientExampleRunner - Error running example: UaException: status=Bad_Timeout, message=timed out waiting for acknowledge java.util.concurrent.ExecutionException: UaException: status=Bad_Timeout, message=timed out waiting for acknowledge at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1887) at org.eclipse.milo.examples.client.ClientExampleRunner.createClient(ClientExampleRunner.java:56) at org.eclipse.milo.examples.client.ClientExampleRunner.run(ClientExampleRunner.java:103) at org.eclipse.milo.examples.client.BrowseExample.main(BrowseExample.java:40) Caused by: org.eclipse.milo.opcua.stack.core.UaException: timed out waiting for acknowledge at org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler.lambda$startHelloTimeout$4(UaTcpClientAcknowledgeHandler.java:156) at org.eclipse.milo.opcua.stack.client.handlers.UaTcpClientAcknowledgeHandler$$Lambda$27/469017260.run(Unknown Source) at io.netty.util.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:581) at io.netty.util.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:655) at io.netty.util.HashedWheelTimer$Worker.run(HashedWheelTimer.java:367) at java.lang.Thread.run(Thread.java:745) 15:48:42.842 [threadDeathWatcher-2-1] DEBUG io.netty.buffer.PoolThreadCache - Freed 2 thread-local buffer(s) from thread: ua-netty-event-loop-0
I took the sample-Code and removed the Certificate/Keypair and changed the URL to opc.tcp://opcua.demo-this.com:51210/UA/SampleServer since the public server doesn't need authorization:
SecurityPolicy securityPolicy = clientExample.getSecurityPolicy();
EndpointDescription[] endpoints = UaTcpStackClient.getEndpoints("opc.tcp://opcua.demo-this.com:51210/UA/SampleServer").get();
EndpointDescription endpoint = Arrays.stream(endpoints)
.filter(e -> e.getSecurityPolicyUri().equals(securityPolicy.getSecurityPolicyUri()))
.findFirst().orElseThrow(() -> new Exception("no desired endpoints returned"));
logger.info("Using endpoint: {} [{}]", endpoint.getEndpointUrl(), securityPolicy);
loader.load();
OpcUaClientConfig config = OpcUaClientConfig.builder()
.setApplicationName(LocalizedText.english("eclipse milo opc-ua client"))
.setApplicationUri("urn:eclipse:milo:examples:client")
//.setCertificate(loader.getClientCertificate())
//.setKeyPair(loader.getClientKeyPair())
.setEndpoint(endpoint)
.setIdentityProvider(clientExample.getIdentityProvider())
.setRequestTimeout(uint(5000))
.build();
return new OpcUaClient(config);
What am I missing?
Greetings and thanks in advance :)
Buried in that stack trace is the real problem: UaException: timed out waiting for acknowledge.
Maybe your firewall or network setup is blocking it, or maybe the server didn't send it back, but the problem is that the client never received the Acknowledge message in response to its Hello.
FWIW, I can run the ReadExample against that public server with no issue. In ReadExample I overrode getSecurityPolicy() and returned SecurityPolicy.None and in ClientExampleRunner just replaced the endpoint URL.