Re: [milo-dev] Error when connecting to OPC server

[Kevin Herron <kevinherron@xxxxxxxxx>]

Joe,

"opcuaserver" doesn't appear to be a hostname reachable from your machine.

Where is the server running?

On Thu, May 23, 2019 at 4:57 AM Joe San <codeintheopen@xxxxxxxxx> wrote:

I came up with a client version and was attempting to connect to a free OPC server here: opc.tcp://opcuaserver:4840

Here is the link to my project, where I run my unit test to get the server timestamp and state

Here is the project: https://github.com/joesan/opc-client-stream

Here is the unit test: https://github.com/joesan/opc-client-stream/blob/master/src/test/scala/com/example/services/opc/OpcClientSpec.scala

When I run my unit test, I get this error:

May 23, 2019 1:51:40 PM wvlet.log.Logger log
INFO: Using endpoint: opc.tcp://opcuaserver:4840, None

java.net.UnknownHostException: opcuaserver: nodename nor servname provided, or not known
java.util.concurrent.CompletionException: java.net.UnknownHostException: opcuaserver: nodename nor servname provided, or not known
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593)
at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)

.....

Any idea why is this?

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