Go 1.25+ · Windows · SimConnect.dll

SimConnect Go SDK

Build Microsoft Flight Simulator add-ons with Go. Lightweight, typed, zero-dependency wrapper over SimConnect.dll for MSFS 2020 & 2024.

$ go get github.com/mrlm-net/simconnect

Why SimConnect Go SDK

Zero Dependencies

Standard library only. No external packages to manage, audit, or update.

Fully Typed API

Strong typing with dedicated structs, enums, and typed constants throughout.

Auto-Reconnect

Built-in connection lifecycle management with automatic reconnection support.

Ready-Made Datasets

Pre-built dataset definitions for aircraft, environment, facilities, and traffic.

Tiered Buffer Pooling

Optimized 4KB/16KB/64KB buffer pools for zero-allocation hot paths.

MSFS 2020 & 2024

Full compatibility with both simulator generations out of the box.

Build powerful MSFS add‑ons with Go.

From real‑time telemetry dashboards to AI traffic controllers — connect directly to the simulator with a typed, zero‑dependency SDK.

Two ways to connect

Use the low-level client for full control, or the manager for production-ready lifecycle management.

Low-Level Client
package main

import (
    "log"
    "github.com/mrlm-net/simconnect"
)

func main() {
    client := simconnect.NewClient("My App")

    if err := client.Connect(); err != nil {
        log.Fatal(err)
    }
    defer client.Disconnect()

    // Read simulator data, emit events, etc.
}
Manager with Auto-Reconnect
package main

import (
    "fmt"
    "github.com/mrlm-net/simconnect/pkg/manager"
)

func main() {
    mgr := manager.New("My App",
        manager.WithAutoReconnect(true),
    )

    mgr.OnConnectionStateChange(
        func(old, current manager.ConnectionState) {
            fmt.Printf("%s -> %s\n", old, current)
        },
    )

    mgr.Start()
}

Ecosystem

More tools built on the same SDK — for AI-assisted development and terminal workflows.

SimConnect MCP

MCP server

Let AI assistants query live simulator data and the full SimConnect SDK reference through the Model Context Protocol. Works with Claude Code, Claude Desktop, and any MCP-compatible client.

1 800+ SimVarsLive dataEventsMSFS 2020 & 202411 MCP tools

simvar-cli

CLI tool

Read, write, and stream MSFS simulation variables straight from the terminal. REPL, watch mode with CSV/JSON output, and a config file — zero extra installs beyond the Go toolchain.

$ simvar-cli
get "PLANE ALTITUDE" feet float64
watch "AIRSPEED INDICATED" knots float64
set "AUTOPILOT HEADING LOCK DIR" degrees 270

Support the project

Back open-source MSFS tooling

Sponsoring covers infrastructure costs, development time, and MSFS 2020 & 2024 licences required to test against real simulator versions.

Sponsor via Revolut

Microsoft Flight Simulator 2020 & 2024 · Go 1.25+ · Windows · Zero external dependencies