Milo is an open-source implementation of OPC UA (currently targeting 1.03). It includes a high-performance stack (channels, serialization, data structures, security) as well as client and server SDKs built on top of the stack.

Stack Overflow tag: milo

Mailing list: https://dev.eclipse.org/mailman/listinfo/milo-dev

Using JDK 8, run mvn clean install from the project root.

To maintain compatibility with Java 8 it is recommended that you build using JDK 8, however the library is runtime compatible with versions 8 and later (e.g. JDK 11, JDK 17).

Releases are published to Maven Central and snapshots to Sonatype.

<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>sdk-client</artifactId>
    <version>0.6.13</version>
</dependency>

<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>sdk-server</artifactId>
    <version>0.6.13</version>
</dependency>

Referencing a SNAPSHOT release requires the Sonatype snapshot repository be added to your pom file:

<repository>
    <id>oss-sonatype</id>
    <name>oss-sonatype</name>
    <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
</repository>

An internet-facing demo server is accessible at opc.tcp://milo.digitalpetri.com:62541/milo.

It accepts both unsecured and secured connections. Before connecting with security you must upload your client's DER-encoded X509 certificate using the form at http://milo.digitalpetri.com.

Authenticate anonymously or with one of the following credential pairs:

• user1 / password
• user2 / password
• admin / password

The code powering the demo server is available here: https://github.com/digitalpetri/opc-ua-demo-server