yadnp3
Yet Another opendnp3 fork -- an experimental fork of opendnp3, the de facto reference implementation of the DNP3 (IEEE-1815) protocol stack.
The upstream project reached end-of-life on September 1, 2022. This fork extends it with new protocol features, Python bindings, and modern CI.
For commercial or production use, consider Step Function I/O's DNP3 library — a modern, commercially supported Rust implementation with C, C++, Java, and .NET bindings.
Features
Protocol — Master operations:
- Integrity / class / range / all-objects scans (periodic and on-demand)
- Select-before-operate and direct-operate commands (CROB, analog outputs)
- File transfer: read, write, delete, get info, directory listing, abort, authenticate
- Device attributes (Group 0)
- Analog input dead bands (Group 34)
- Freeze operations
- Cold/warm restart
- Time synchronization (LAN and serial modes)
- Link status check
Protocol — Outstation:
- Static and event reporting for all standard data types
- Unsolicited responses with configurable retries
- Command handling (select/operate, direct operate)
- File transfer handler interface
- Broadcast support
- Configurable event buffer and class assignment
Transports:
- TCP client and server
- Outstation TCP client mode (outstation connects to master)
- UDP
- Serial
- TLS (client and server, requires OpenSSL)
Bindings:
- Python (pybind11) —
pip install yadnp3(primary focus of this fork) - Java (JNI) and .NET (C++/CLI) bindings exist from upstream but are not actively maintained in this fork
Python Quick Start
pip install yadnp3
import opendnp3
# Create a manager with 1 thread
manager = opendnp3.DNP3Manager(1)
# ... create channels, masters, outstations
# See python/tests/ for full examples
manager.Shutdown()
Building from Source
Prerequisites
- CMake >= 3.11
- C++14 compiler (GCC, Clang, or MSVC 2015+)
- OpenSSL >= 1.1.1 (optional, for TLS)
- Python 3.9+ and pybind11 (optional, for Python bindings)
Quick Build
mkdir build && cd build
cmake .. -DDNP3_TLS=ON -DDNP3_TESTS=ON
cmake --build . --parallel $(nproc)
ctest --output-on-failure
CMake Options
| Option | Default | Description |
|---|---|---|
DNP3_TLS |
OFF | TLS support (requires OpenSSL) |
DNP3_TESTS |
OFF | Unit and integration tests |
DNP3_EXAMPLES |
OFF | Example applications |
DNP3_PYTHON |
OFF | Python bindings (pybind11) |
DNP3_JAVA |
OFF | Java JNI bindings (upstream, not maintained) |
DNP3_DOTNET |
OFF | .NET bindings (upstream, Windows, not maintained) |
DNP3_STATIC_LIBS |
platform | Static libraries |
DNP3_EVERYTHING |
OFF | All optional targets |
Python Wheel (Docker)
docker build -f Dockerfile --build-arg PYTHON_VERSION=3.12 -t yadnp3-build .
docker create --name whl yadnp3-build
docker cp whl:/wheels/. ./dist/
docker rm whl
pip install dist/*.whl
Project Structure
yadnp3/
├── cpp/lib/ Core C++ library (~79k lines)
│ ├── include/opendnp3/ Public API headers
│ └── src/ Private implementation
├── cpp/tests/ Unit, integration, and interop tests
├── cpp/examples/ Example master/outstation applications
├── python/ Python bindings (pybind11, actively maintained)
├── java/ Java bindings (JNI + Maven, upstream, not maintained)
├── dotnet/ .NET bindings (C++/CLI, upstream, not maintained)
├── generation/ Code generation (Scala/SBT)
├── Dockerfile Linux wheel build
└── .github/workflows/ CI (build, test, wheel packaging)
License
Licensed under the Apache License 2.0.
Copyright (c) 2010-2011 Green Energy Corp Copyright (c) 2013-2022 Step Function I/O LLC Copyright (c) 2024-2026 f0rw4rd (yadnp3 fork) Copyright (c) 2010-2022 various contributors
1 maintainer
Metadata
1 maintainer
Release files for yadnp3 3.2.1.4
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| yadnp3-3.2.1.4.tar.gz | 65.9 kB | With provenance | Details for yadnp3-3.2.1.4.tar.gz |
Built distributions (wheels)
Total release size: 43.0 MB
Release files / yadnp3-3.2.1.4.tar.gz
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