# milo

**Repository Path**: mirrors_eclipse/milo

## Basic Information

- **Project Name**: milo
- **Description**:  Eclipse Milo™ - an open source implementation of OPC UA (IEC 62541).
- **Primary Language**: Unknown
- **License**: EPL-2.0
- **Default Branch**: main
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 4
- **Forks**: 2
- **Created**: 2020-08-22
- **Last Updated**: 2026-07-11

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Eclipse Milo
[![Actions](https://img.shields.io/github/actions/workflow/status/eclipse-milo/milo/.github%2Fworkflows%2Fmaven-verify.yml
)](https://github.com/eclipse-milo/milo/actions/workflows/maven-verify.yml)
[![Maven Central](https://img.shields.io/maven-central/v/org.eclipse.milo/milo.svg)](https://search.maven.org/#search%7Cgav%7C1%7Cg%3A%22org.eclipse.milo%22%20AND%20a%3A%22milo%22)

Milo is an open-source implementation of OPC UA (currently targeting 1.05). 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](http://stackoverflow.com/questions/tagged/milo)

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

## Requirements

The repository pins its Java and Maven toolchain with `mise`:

```shell
mise install
```

If `mise` reports that the config is not trusted, review `.mise.toml` and run
`mise trust .mise.toml` once. After installation, run Maven through `mise exec --` so
the pinned Java 17 and Maven versions are used.

## Maven

### Building Milo

**Using JDK 17**, run this from the project root:

```shell
mise exec -- mvn clean install
```

To maintain compatibility with Java 17 it is recommended that you build using JDK 17, however the library is runtime compatible with versions 17 and later (e.g. JDK 21, JDK 24).

### Releases

Releases are published to Maven Central and snapshots to Sonatype.

#### OPC UA Client SDK

```xml
<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>milo-sdk-client</artifactId>
    <version>1.1.4</version>
</dependency>
```

#### OPC UA Server SDK

```xml
<dependency>
    <groupId>org.eclipse.milo</groupId>
    <artifactId>milo-sdk-server</artifactId>
    <version>1.1.4</version>
</dependency>
```

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

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

## Public Demo Server

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

It accepts both unsecured and secured connections. All incoming client certificates are automatically trusted.

Authenticate anonymously or with one of the following credential pairs:

- `User` / `password`
    - roles: `WellKnownRole_AuthenticatedUser`
- `UserA` / `password`
    - roles: `SiteA_Read`, `SiteA_Write`
- `UserB` / `password`
    - roles: `SiteB_Read`, `SiteB_Write`
- `SiteAdmin` / `password`
    - roles: `SiteA_Read`, `SiteB_Read`
- `SecurityAdmin` / `password`
    - roles: `WellKnownRole_SecurityAdmin`

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