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marcschier/README.md

📚 Open-source .NET libraries & tools

A collection of public, NativeAOT-ready building blocks for modern .NET — secure transport, messaging, IoT connectivity, scalability protocols, consensus, replication, and file access — plus a couple of Model Context Protocol (MCP) servers.

NuGet packages Target frameworks NativeAOT

🤖 MCP servers

Model Context Protocol servers. These ship as container images and/or .NET tools rather than reusable nuget.org libraries.

🏭 opcuakb-mcp

An OPC UA Knowledge Base MCP server that crawls and indexes the OPC UA specification for retrieval-augmented tooling.

  • Distributed as a GHCR container image: docker pull ghcr.io/marcschier/opcua-mcp-server
  • Also published as the OpcUaKb.McpServer .NET tool to GitHub Packages.

🕸️ netcap-mcp

An MCP server that captures network traces (pcap/http) and returns them as pcap, pcapng, JSON, CSV, or text.

  • The MCP server (Netcap.Mcp) is published as a .NET tool to GitHub Packages, with a container image built from the in-repo Dockerfile.

📦 NuGet libraries

📨 mqtt-client

High-performance, low-allocation MQTT 3.1.1 + 5.0 client for .NET. Channels-style API, NativeAOT-ready.

Package Version Downloads
Mqtt.Client v dt
Mqtt.Client.Testing v dt

🧬 crdt

High-performance, NativeAOT-ready Conflict-free Replicated Data Types (CRDTs) for modern .NET — the aggregating stack that ties the transports and consensus together.

Package Version Downloads
Crdt v dt
Crdt.Consensus v dt
Crdt.Consensus.Raft v dt
Crdt.Gc v dt
Crdt.Transport v dt
Crdt.Transport.Dtls v dt
Crdt.Transport.Mqtt v dt
Crdt.Transport.NanoMsg v dt
Crdt.Transport.Pgm v dt

🔌 nanomsg-sharp

A pure, modern .NET implementation of the nanomsg and NNG Scalability Protocols (SP) — wire-compatible with both, with a zero-copy System.IO.Pipelines data path.

Package Version Downloads
NanoMsgSharp v dt
NanoMsgSharp.Dtls v dt

🗳️ raft-cs

Pure-managed, NativeAOT-ready Raft consensus for .NET (modeled on tikv/raft-rs) with replaceable storage and transport.

Package Version Downloads
RaftCs v dt
RaftCs.Transport v dt
RaftCs.Transport.NanoMsg v dt
RaftCs.Storage.File v dt

🗂️ nfs

A modern, NativeAOT-ready .NET 10 NFS client & server library (ONC/RPC + XDR) supporting NFS v2 / v3 / v4.0 / 4.1 / 4.2 — built for protocol compliance and interop.

Package Version Downloads
Nfs v dt

ℹ️ Nfs is a consolidated umbrella package; the granular Nfs.* assemblies are published to GitHub Packages.

📡 pgm

Pure-managed, NativeAOT-ready PGM (RFC 3208) reliable multicast over UDP for modern .NET.

Package Version Downloads
Pgm v dt

🔐 dtls

Cross-platform DTLS 1.0 / 1.2 / 1.3 for .NET using the host OS cryptography — a managed, AOT-friendly 1.3 engine plus native OpenSSL / Schannel / Apple backends.

Package Version Downloads
DtlsSharp v dt

🛰️ iothubby

High-performance, NativeAOT-ready Azure IoT Hub & IoT Edge device/module SDK over MQTT (built on Mqtt.Client) — telemetry, cloud-to-device, direct methods, device/module twins, edge module routing, and DPS provisioning.

Package Version Downloads
IoTHubby v dt
IoTHubby.Edge v dt

⚙️ opc-classic

A cross-platform, NativeAOT-ready .NET 10 OPC Classic stack — DA, AE, HDA, Batch, Commands, Complex Data, DX, Security, Discovery, and XML-DA — over a fully managed DCOM/MSRPC transport with self-contained NTLMv2 / Kerberos / SPNEGO authentication. No Windows COM required at runtime.

Package Version Downloads
Opc.Classic v dt
Opc.Classic.Windows v dt
Opc.Classic.Generators v dt
Opc.Classic.MigrationAnalyzer v dt
Opc.Classic.Mcp v dt

ℹ️ Opc.Classic is a self-contained SDK meta-package (client + managed server); Opc.Classic.Windows adds Windows DCOM server hosting; Opc.Classic.Generators / Opc.Classic.MigrationAnalyzer are Roslyn source-generator / migration analyzer packages; Opc.Classic.Mcp is an MCP server tool. The granular per-spec Opc.Classic.* assemblies ship to GitHub Packages.

🧭 Repo dependencies

All cross-repository links are via published NuGet packages (no source coupling), each repo produces a core nuget without any dependencies to other nugets produced from other repositories. Extension libraries pull in nugets from other repositories to extend the functionality of the core nuget:

Project Extensions depend on Via package(s)
🧬 crdt raft-cs, nanomsg-sharp, dtls, pgm, mqtt-client RaftCs, RaftCs.Transport, NanoMsgSharp, DtlsSharp, Pgm, Mqtt.Client
🗳️ raft-cs nanomsg-sharp NanoMsgSharp (RaftCs.Transport.NanoMsg)
🔌 nanomsg-sharp dtls DtlsSharp (NanoMsgSharp.Dtls)
🛰️ iothubby mqtt-client Mqtt.Client
📨 mqtt-client · 📡 pgm · 🔐 dtls · 🗂️ nfs · ⚙️ opc-classic — standalone
🏭 opcuakb-mcp · 🕸️ netcap-mcp — standalone

The libraries are layered: lower-level transports and consensus are independent packages that the higher-level CRDT stack composes. An arrow A → B means A depends on B (consumes B's NuGet package).

graph TD
    crdt["🧬 crdt"] -->|RaftCs| raftcs["🗳️ raft-cs"]
    crdt -->|NanoMsgSharp| nanomsg["🔌 nanomsg-sharp"]
    crdt -->|DtlsSharp| dtls["🔐 dtls"]
    crdt -->|Pgm| pgm["📡 pgm"]
    crdt -->|Mqtt.Client| mqtt["📨 mqtt-client"]
    raftcs -->|NanoMsgSharp| nanomsg
    nanomsg -->|DtlsSharp| dtls
    iothubby["🛰️ iothubby"] -->|Mqtt.Client| mqtt

    nfs["🗂️ nfs"]
    opcclassic["⚙️ opc-classic"]
    opcuakb["🏭 opcuakb-mcp"]
    netcap["🕸️ netcap-mcp"]

    classDef standalone fill:#f6f8fa,stroke:#999,stroke-dasharray:4 3,color:#333;
    class nfs,opcclassic,opcuakb,netcap standalone;
Loading

Dashed nodes (nfs, opc-classic, opcuakb-mcp, netcap-mcp) are standalone — they have no dependencies on the other projects here.

Pinned Loading

  1. crdt crdt Public

    High-performance, NativeAOT-ready Conflict-free Replicated Data Types (CRDTs) for modern .NET.

    C#

  2. mqtt-client mqtt-client Public

    High-performance, low-allocation MQTT 3.1.1 + 5.0 client for .NET. Channels-style API, NativeAOT-ready.

    C#

  3. nfs nfs Public

    A modern, NativeAOT-ready .NET 10 NFS client & server library (ONC/RPC + XDR) supporting NFS v2/v3/v4.0/4.1/4.2 — built for protocol compliance and interop.

    C#

  4. opcuakb-mcp opcuakb-mcp Public

    OPC UA Knowledge base MCP

    C# 2

  5. pgm pgm Public

    Pure-managed, NativeAOT-ready PGM (RFC 3208) reliable multicast over UDP for modern .NET

    C#

  6. nanomsg-sharp nanomsg-sharp Public

    A pure, modern .NET implementation of the nanomsg and NNG Scalability Protocols (SP) - wire-compatible with both, with a zero-copy System.IO.Pipelines data path.

    C#