Initial commit: embedded Tailscale tsnet Flutter plugin for remote heater access

Go layer (c-archive) provides a localhost TCP proxy through a WireGuard tunnel. Flutter connects gRPC to localhost:PORT, Go forwards via tsnet to heater's Tailscale IP. No VPN entitlement needed — uses userspace netstack. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-03-14 05:13:55 -04:00 · 2026-03-14 05:13:55 -04:00 · 2dbadcd8ed
commit 2dbadcd8ed
16 changed files with 1931 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,5 @@
+.dart_tool/
+.packages
+.pub/
+build/
+ios/TailscaleKit.xcframework/
--- a/build_go.sh
+++ b/build_go.sh
@ -0,0 +1,149 @@
+#!/usr/bin/env bash
+# Build the Go static library for iOS using go build -buildmode=c-archive.
+#
+# This is the production-grade approach (same as Tailscale's own iOS app).
+# No gomobile dependency — just the standard Go compiler + Xcode SDK.
+#
+# Prerequisites:
+#   - Go 1.23+
+#   - Xcode with iOS SDK
+#
+# Usage:
+#   cd /path/to/tailscale_kit
+#   ./build_go.sh
+#
+# Output: ios/TailscaleKit.xcframework (static library xcframework)
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+GO_DIR="$SCRIPT_DIR/ios/Go"
+BUILD_DIR="$SCRIPT_DIR/ios/build"
+OUTPUT="$SCRIPT_DIR/ios/TailscaleKit.xcframework"
+MIN_IOS="14.0"
+
+# Omit Tailscale features we don't need — we only use tsnet.Dial() for proxying.
+OMIT_TAGS="ts_omit_ssh,ts_omit_drive,ts_omit_taildrop,ts_omit_serve"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_webclient,ts_omit_capture,ts_omit_appconnectors"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_debug,ts_omit_doctor,ts_omit_portlist,ts_omit_posture"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_cli,ts_omit_kube,ts_omit_aws,ts_omit_bird"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_synology,ts_omit_tpm,ts_omit_tap,ts_omit_conn25"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_qrcodes,ts_omit_relayserver,ts_omit_systray"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_webbrowser,ts_omit_completion,ts_omit_completion_scripts"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_colorable,ts_omit_clientupdate,ts_omit_wakeonlan"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_usermetrics,ts_omit_desktop_sessions,ts_omit_ace"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_acme,ts_omit_hujsonconf,ts_omit_tailnetlock"
+OMIT_TAGS="$OMIT_TAGS,ts_omit_netlog,ts_omit_syspolicy,ts_omit_cachenetmap"
+
+rm -rf "$BUILD_DIR" "$OUTPUT"
+mkdir -p "$BUILD_DIR/ios-arm64/Headers" "$BUILD_DIR/ios-arm64-simulator/Headers"
+
+cd "$GO_DIR"
+
+echo "==> Tidying Go modules..."
+go mod tidy
+
+# --- Build for iOS device (arm64) ---
+echo "==> Building for iOS device (arm64)..."
+IPHONEOS_SDK=$(xcrun --sdk iphoneos --show-sdk-path)
+IPHONEOS_CC=$(xcrun --sdk iphoneos --find clang)
+
+CGO_ENABLED=1 \
+GOOS=ios \
+GOARCH=arm64 \
+CC="$IPHONEOS_CC" \
+CGO_CFLAGS="-isysroot $IPHONEOS_SDK -arch arm64 -miphoneos-version-min=$MIN_IOS" \
+CGO_LDFLAGS="-isysroot $IPHONEOS_SDK -arch arm64 -miphoneos-version-min=$MIN_IOS" \
+go build \
+  -buildmode=c-archive \
+  -tags "$OMIT_TAGS" \
+  -ldflags="-s -w" \
+  -o "$BUILD_DIR/ios-arm64/libtailscale.a" \
+  .
+
+# Helper: create a framework bundle from a static library
+create_framework() {
+  local lib_path="$1"
+  local header_path="$2"
+  local framework_dir="$3"
+
+  mkdir -p "$framework_dir/Headers" "$framework_dir/Modules"
+
+  # Copy the static library as the framework binary
+  cp "$lib_path" "$framework_dir/TailscaleKit"
+
+  # Copy and clean the header (remove Go-internal types)
+  cp "$header_path" "$framework_dir/Headers/tailscale.h"
+
+  # Module map
+  cat > "$framework_dir/Modules/module.modulemap" <<'MODMAP'
+framework module TailscaleKit {
+    header "tailscale.h"
+    export *
+}
+MODMAP
+
+  # Info.plist
+  cat > "$framework_dir/Info.plist" <<PLIST
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleIdentifier</key>
+  <string>com.constellation-heating.TailscaleKit</string>
+  <key>CFBundleName</key>
+  <string>TailscaleKit</string>
+  <key>CFBundleVersion</key>
+  <string>1</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+</dict>
+</plist>
+PLIST
+}
+
+create_framework \
+  "$BUILD_DIR/ios-arm64/libtailscale.a" \
+  "$BUILD_DIR/ios-arm64/libtailscale.h" \
+  "$BUILD_DIR/ios-arm64/TailscaleKit.framework"
+
+# --- Build for iOS simulator (arm64) ---
+echo "==> Building for iOS simulator (arm64)..."
+SIMULATOR_SDK=$(xcrun --sdk iphonesimulator --show-sdk-path)
+SIMULATOR_CC=$(xcrun --sdk iphonesimulator --find clang)
+
+CGO_ENABLED=1 \
+GOOS=ios \
+GOARCH=arm64 \
+CC="$SIMULATOR_CC" \
+CGO_CFLAGS="-isysroot $SIMULATOR_SDK -arch arm64 -miphoneos-version-min=$MIN_IOS -target arm64-apple-ios${MIN_IOS}-simulator" \
+CGO_LDFLAGS="-isysroot $SIMULATOR_SDK -arch arm64 -miphoneos-version-min=$MIN_IOS -target arm64-apple-ios${MIN_IOS}-simulator" \
+go build \
+  -buildmode=c-archive \
+  -tags "$OMIT_TAGS" \
+  -ldflags="-s -w" \
+  -o "$BUILD_DIR/ios-arm64-simulator/libtailscale.a" \
+  .
+
+create_framework \
+  "$BUILD_DIR/ios-arm64-simulator/libtailscale.a" \
+  "$BUILD_DIR/ios-arm64-simulator/libtailscale.h" \
+  "$BUILD_DIR/ios-arm64-simulator/TailscaleKit.framework"
+
+# --- Create xcframework from framework bundles ---
+echo "==> Creating xcframework..."
+xcodebuild -create-xcframework \
+  -framework "$BUILD_DIR/ios-arm64/TailscaleKit.framework" \
+  -framework "$BUILD_DIR/ios-arm64-simulator/TailscaleKit.framework" \
+  -output "$OUTPUT"
+
+# Clean up build artifacts
+rm -rf "$BUILD_DIR"
+
+# Also copy the header to Classes/ for CocoaPods umbrella header
+cp "$OUTPUT/ios-arm64/TailscaleKit.framework/Headers/tailscale.h" "$SCRIPT_DIR/ios/Classes/tailscale.h"
+
+echo "==> Built: $OUTPUT"
+du -sh "$OUTPUT"
+echo "==> Device framework:"
+ls -lh "$OUTPUT/ios-arm64/TailscaleKit.framework/TailscaleKit"
--- a/ios/.gitignore
+++ b/ios/.gitignore
@ -0,0 +1,2 @@
+# Built by gomobile — run ./build_go.sh to regenerate
+TailscaleKit.xcframework/
--- a/ios/Classes/TailscaleKitPlugin.swift
+++ b/ios/Classes/TailscaleKitPlugin.swift
@ -0,0 +1,180 @@
+import Flutter
+import UIKit
+
+/// Swift bridge between Flutter MethodChannel and Go static library.
+///
+/// Calls C functions exported from Go via c-archive:
+///   TailscaleStart(stateDir, authKey, hostname) → NULL or error
+///   TailscaleStartProxy(ip, port, &localPort)   → NULL or error
+///   TailscaleStopProxy()                         → NULL or error
+///   TailscaleStop()                              → NULL or error
+///   TailscaleStatus(&err)                        → JSON string or NULL
+///   TailscaleIP(&err)                            → IP string or NULL
+///   TailscaleFreeString(ptr)                     → frees returned strings
+public class TailscaleKitPlugin: NSObject, FlutterPlugin {
+
+    private lazy var stateDir: String = {
+        let docs = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
+        let dir = docs.appendingPathComponent("tailscale_state", isDirectory: true)
+        try? FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+        return dir.path
+    }()
+
+    public static func register(with registrar: FlutterPluginRegistrar) {
+        let channel = FlutterMethodChannel(name: "tailscale_kit", binaryMessenger: registrar.messenger())
+        let instance = TailscaleKitPlugin()
+        registrar.addMethodCallDelegate(instance, channel: channel)
+    }
+
+    public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        switch call.method {
+        case "start":
+            handleStart(call, result: result)
+        case "startProxy":
+            handleStartProxy(call, result: result)
+        case "stopProxy":
+            handleStopProxy(result: result)
+        case "stop":
+            handleStop(result: result)
+        case "status":
+            handleStatus(result: result)
+        case "tailscaleIP":
+            handleTailscaleIP(result: result)
+        default:
+            result(FlutterMethodNotImplemented)
+        }
+    }
+
+    /// Consume a C string returned by Go: copy to Swift String, then free.
+    private func consumeCString(_ ptr: UnsafeMutablePointer<CChar>?) -> String? {
+        guard let ptr = ptr else { return nil }
+        let str = String(cString: ptr)
+        TailscaleFreeString(ptr)
+        return str
+    }
+
+    // TailscaleStart(stateDir, authKey, hostname) → NULL or error
+    private func handleStart(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        guard let args = call.arguments as? [String: Any],
+              let authKey = args["authKey"] as? String,
+              let hostname = args["hostname"] as? String else {
+            result(FlutterError(code: "INVALID_ARGS", message: "Missing authKey or hostname", details: nil))
+            return
+        }
+
+        let dir = self.stateDir
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            // Go's C.GoString() copies immediately, so withCString lifetimes are fine
+            let errPtr = dir.withCString { dirC in
+                authKey.withCString { keyC in
+                    hostname.withCString { hostC in
+                        TailscaleStart(
+                            UnsafeMutablePointer(mutating: dirC),
+                            UnsafeMutablePointer(mutating: keyC),
+                            UnsafeMutablePointer(mutating: hostC)
+                        )
+                    }
+                }
+            }
+            let err = self.consumeCString(errPtr)
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "START_FAILED", message: err, details: nil))
+                } else {
+                    result(nil)
+                }
+            }
+        }
+    }
+
+    // TailscaleStartProxy(ip, port, &localPort) → NULL or error
+    private func handleStartProxy(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
+        guard let args = call.arguments as? [String: Any],
+              let ip = args["ip"] as? String,
+              let port = args["port"] as? Int else {
+            result(FlutterError(code: "INVALID_ARGS", message: "Missing ip or port", details: nil))
+            return
+        }
+
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            var localPort: CInt = 0
+            let errPtr = ip.withCString { ipC in
+                TailscaleStartProxy(
+                    UnsafeMutablePointer(mutating: ipC),
+                    CInt(port),
+                    &localPort
+                )
+            }
+            let err = self.consumeCString(errPtr)
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "PROXY_FAILED", message: err, details: nil))
+                } else {
+                    result(Int(localPort))
+                }
+            }
+        }
+    }
+
+    // TailscaleStopProxy() → NULL or error
+    private func handleStopProxy(result: @escaping FlutterResult) {
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            let err = self.consumeCString(TailscaleStopProxy())
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "STOP_PROXY_FAILED", message: err, details: nil))
+                } else {
+                    result(nil)
+                }
+            }
+        }
+    }
+
+    // TailscaleStop() → NULL or error
+    private func handleStop(result: @escaping FlutterResult) {
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            let err = self.consumeCString(TailscaleStop())
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "STOP_FAILED", message: err, details: nil))
+                } else {
+                    result(nil)
+                }
+            }
+        }
+    }
+
+    // TailscaleStatus(&errOut) → JSON string or NULL
+    private func handleStatus(result: @escaping FlutterResult) {
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            var errPtr: UnsafeMutablePointer<CChar>? = nil
+            let jsonPtr = TailscaleStatus(&errPtr)
+            let err = self.consumeCString(errPtr)
+            let json = self.consumeCString(jsonPtr)
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "STATUS_FAILED", message: err, details: nil))
+                } else {
+                    result(json)
+                }
+            }
+        }
+    }
+
+    // TailscaleIP(&errOut) → IP string or NULL
+    private func handleTailscaleIP(result: @escaping FlutterResult) {
+        DispatchQueue.global(qos: .userInitiated).async { [self] in
+            var errPtr: UnsafeMutablePointer<CChar>? = nil
+            let ipPtr = TailscaleIP(&errPtr)
+            let err = self.consumeCString(errPtr)
+            let ip = self.consumeCString(ipPtr)
+            DispatchQueue.main.async {
+                if let err = err {
+                    result(FlutterError(code: "IP_FAILED", message: err, details: nil))
+                } else {
+                    result(ip)
+                }
+            }
+        }
+    }
+}
--- a/ios/Classes/tailscale.h
+++ b/ios/Classes/tailscale.h
@ -0,0 +1,100 @@
+/* Code generated by cmd/cgo; DO NOT EDIT. */
+
+/* package github.com/constellation-heating/tailscale-kit */
+
+
+#line 1 "cgo-builtin-export-prolog"
+
+#include <stddef.h>
+
+#ifndef GO_CGO_EXPORT_PROLOGUE_H
+#define GO_CGO_EXPORT_PROLOGUE_H
+
+#ifndef GO_CGO_GOSTRING_TYPEDEF
+typedef struct { const char *p; ptrdiff_t n; } _GoString_;
+extern size_t _GoStringLen(_GoString_ s);
+extern const char *_GoStringPtr(_GoString_ s);
+#endif
+
+#endif
+
+/* Start of preamble from import "C" comments.  */
+
+
+#line 13 "bridge.go"
+
+#include <stdlib.h>
+
+#line 1 "cgo-generated-wrapper"
+
+
+/* End of preamble from import "C" comments.  */
+
+
+/* Start of boilerplate cgo prologue.  */
+#line 1 "cgo-gcc-export-header-prolog"
+
+#ifndef GO_CGO_PROLOGUE_H
+#define GO_CGO_PROLOGUE_H
+
+typedef signed char GoInt8;
+typedef unsigned char GoUint8;
+typedef short GoInt16;
+typedef unsigned short GoUint16;
+typedef int GoInt32;
+typedef unsigned int GoUint32;
+typedef long long GoInt64;
+typedef unsigned long long GoUint64;
+typedef GoInt64 GoInt;
+typedef GoUint64 GoUint;
+typedef size_t GoUintptr;
+typedef float GoFloat32;
+typedef double GoFloat64;
+#ifdef _MSC_VER
+#if !defined(__cplusplus) || _MSVC_LANG <= 201402L
+#include <complex.h>
+typedef _Fcomplex GoComplex64;
+typedef _Dcomplex GoComplex128;
+#else
+#include <complex>
+typedef std::complex<float> GoComplex64;
+typedef std::complex<double> GoComplex128;
+#endif
+#else
+typedef float _Complex GoComplex64;
+typedef double _Complex GoComplex128;
+#endif
+
+/*
+  static assertion to make sure the file is being used on architecture
+  at least with matching size of GoInt.
+*/
+typedef char _check_for_64_bit_pointer_matching_GoInt[sizeof(void*)==64/8 ? 1:-1];
+
+#ifndef GO_CGO_GOSTRING_TYPEDEF
+typedef _GoString_ GoString;
+#endif
+typedef void *GoMap;
+typedef void *GoChan;
+typedef struct { void *t; void *v; } GoInterface;
+typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
+
+#endif
+
+/* End of boilerplate cgo prologue.  */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern char* TailscaleStart(char* stateDir, char* authKey, char* hostname);
+extern char* TailscaleStartProxy(char* remoteIP, int remotePort, int* localPort);
+extern char* TailscaleStopProxy(void);
+extern char* TailscaleStop(void);
+extern char* TailscaleStatus(char** errOut);
+extern char* TailscaleIP(char** errOut);
+extern void TailscaleFreeString(char* s);
+
+#ifdef __cplusplus
+}
+#endif
--- a/ios/Classes/tailscale_kit.h
+++ b/ios/Classes/tailscale_kit.h
@ -0,0 +1,2 @@
+// Expose Go C functions to Swift via the pod's Clang module
+#include "tailscale.h"
--- a/ios/Go/bridge.go
+++ b/ios/Go/bridge.go
@ -0,0 +1,278 @@
+// Package main provides C-exported functions for embedding Tailscale's
+// tsnet into a Flutter iOS app via c-archive.
+//
+// Build: go build -buildmode=c-archive -o libtailscale.a
+//
+// All exported functions use C-compatible types. Error convention:
+//   - Returns NULL on success, C string with error message on failure
+//   - Caller must free returned strings with TailscaleFreeString()
+//
+// Uses userspace netstack — NO VPN entitlement needed on iOS.
+package main
+
+/*
+#include <stdlib.h>
+*/
+import "C"
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net"
+	"sync"
+	"unsafe"
+
+	"tailscale.com/tsnet"
+)
+
+var (
+	mu       sync.Mutex
+	server   *tsnet.Server
+
+	proxyMu       sync.Mutex
+	proxyListener net.Listener
+	proxyCancel   context.CancelFunc
+)
+
+// TailscaleStart joins the Tailnet with the given auth key.
+// stateDir: app's documents directory for persisting identity.
+// authKey: Tailscale auth key (reusable, tag-scoped).
+// hostname: device name in the Tailnet.
+// Returns NULL on success, error string on failure (caller must free).
+//
+//export TailscaleStart
+func TailscaleStart(stateDir, authKey, hostname *C.char) *C.char {
+	mu.Lock()
+	defer mu.Unlock()
+
+	if server != nil {
+		return C.CString("already started")
+	}
+
+	s := &tsnet.Server{
+		Dir:       C.GoString(stateDir),
+		Hostname:  C.GoString(hostname),
+		AuthKey:   C.GoString(authKey),
+		Ephemeral: false,
+	}
+
+	if err := s.Start(); err != nil {
+		return C.CString(fmt.Sprintf("tsnet start: %v", err))
+	}
+
+	server = s
+	return nil
+}
+
+// TailscaleStartProxy creates a localhost TCP proxy to a Tailscale IP.
+// Writes the local port to *localPort. Connect gRPC to 127.0.0.1:<localPort>.
+// Returns NULL on success, error string on failure (caller must free).
+//
+//export TailscaleStartProxy
+func TailscaleStartProxy(remoteIP *C.char, remotePort C.int, localPort *C.int) *C.char {
+	mu.Lock()
+	s := server
+	mu.Unlock()
+
+	if s == nil {
+		return C.CString("not started, call TailscaleStart() first")
+	}
+
+	proxyMu.Lock()
+	defer proxyMu.Unlock()
+
+	stopProxyLocked()
+
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		return C.CString(fmt.Sprintf("listen: %v", err))
+	}
+
+	ctx, cancel := context.WithCancel(context.Background())
+	proxyListener = ln
+	proxyCancel = cancel
+
+	remoteAddr := fmt.Sprintf("%s:%d", C.GoString(remoteIP), int(remotePort))
+	port := ln.Addr().(*net.TCPAddr).Port
+	*localPort = C.int(port)
+
+	go acceptLoop(ctx, s, ln, remoteAddr)
+
+	return nil
+}
+
+func acceptLoop(ctx context.Context, s *tsnet.Server, ln net.Listener, remoteAddr string) {
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+				continue
+			}
+		}
+		go handleConn(ctx, s, conn, remoteAddr)
+	}
+}
+
+func handleConn(ctx context.Context, s *tsnet.Server, local net.Conn, remoteAddr string) {
+	defer local.Close()
+
+	remote, err := s.Dial(ctx, "tcp", remoteAddr)
+	if err != nil {
+		return
+	}
+	defer remote.Close()
+
+	done := make(chan struct{}, 2)
+	go func() {
+		io.Copy(remote, local)
+		done <- struct{}{}
+	}()
+	go func() {
+		io.Copy(local, remote)
+		done <- struct{}{}
+	}()
+
+	select {
+	case <-done:
+	case <-ctx.Done():
+	}
+}
+
+// TailscaleStopProxy stops the local TCP proxy.
+// Returns NULL on success, error string on failure (caller must free).
+//
+//export TailscaleStopProxy
+func TailscaleStopProxy() *C.char {
+	proxyMu.Lock()
+	defer proxyMu.Unlock()
+	stopProxyLocked()
+	return nil
+}
+
+func stopProxyLocked() {
+	if proxyCancel != nil {
+		proxyCancel()
+		proxyCancel = nil
+	}
+	if proxyListener != nil {
+		proxyListener.Close()
+		proxyListener = nil
+	}
+}
+
+// TailscaleStop disconnects from the Tailnet and cleans up.
+// Returns NULL on success, error string on failure (caller must free).
+//
+//export TailscaleStop
+func TailscaleStop() *C.char {
+	TailscaleStopProxy()
+
+	mu.Lock()
+	defer mu.Unlock()
+
+	if server == nil {
+		return nil
+	}
+
+	err := server.Close()
+	server = nil
+	if err != nil {
+		return C.CString(fmt.Sprintf("close: %v", err))
+	}
+	return nil
+}
+
+// TailscaleStatus returns the current Tailscale status as a JSON string.
+// On success, returns the JSON string (caller must free). Sets *errOut to NULL.
+// On failure, returns NULL and sets *errOut to error string (caller must free).
+//
+//export TailscaleStatus
+func TailscaleStatus(errOut **C.char) *C.char {
+	mu.Lock()
+	s := server
+	mu.Unlock()
+
+	if s == nil {
+		*errOut = nil
+		return C.CString("{}")
+	}
+
+	lc, err := s.LocalClient()
+	if err != nil {
+		*errOut = C.CString(fmt.Sprintf("local client: %v", err))
+		return nil
+	}
+
+	st, err := lc.Status(context.Background())
+	if err != nil {
+		*errOut = C.CString(fmt.Sprintf("status: %v", err))
+		return nil
+	}
+
+	b, err := json.Marshal(st)
+	if err != nil {
+		*errOut = C.CString(fmt.Sprintf("marshal: %v", err))
+		return nil
+	}
+
+	*errOut = nil
+	return C.CString(string(b))
+}
+
+// TailscaleIP returns this node's Tailscale IPv4 address.
+// On success, returns the IP string (caller must free). Sets *errOut to NULL.
+// On failure, returns NULL and sets *errOut to error string (caller must free).
+//
+//export TailscaleIP
+func TailscaleIP(errOut **C.char) *C.char {
+	mu.Lock()
+	s := server
+	mu.Unlock()
+
+	if s == nil {
+		*errOut = C.CString("not started")
+		return nil
+	}
+
+	lc, err := s.LocalClient()
+	if err != nil {
+		*errOut = C.CString(fmt.Sprintf("local client: %v", err))
+		return nil
+	}
+
+	st, err := lc.Status(context.Background())
+	if err != nil {
+		*errOut = C.CString(fmt.Sprintf("status: %v", err))
+		return nil
+	}
+
+	if st.Self == nil || len(st.Self.TailscaleIPs) == 0 {
+		*errOut = C.CString("no tailscale IP assigned yet")
+		return nil
+	}
+
+	for _, ip := range st.Self.TailscaleIPs {
+		if ip.Is4() {
+			*errOut = nil
+			return C.CString(ip.String())
+		}
+	}
+
+	*errOut = nil
+	return C.CString(st.Self.TailscaleIPs[0].String())
+}
+
+// TailscaleFreeString frees a string returned by other Tailscale functions.
+//
+//export TailscaleFreeString
+func TailscaleFreeString(s *C.char) {
+	if s != nil {
+		C.free(unsafe.Pointer(s))
+	}
+}
+
+func main() {} // required for c-archive, unused
--- a/ios/Go/go.mod
+++ b/ios/Go/go.mod
@ -0,0 +1,83 @@
+module github.com/constellation-heating/tailscale-kit
+
+go 1.25.0
+
+require tailscale.com v1.82.0
+
+require (
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/akutz/memconn v0.1.0 // indirect
+	github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa // indirect
+	github.com/aws/aws-sdk-go-v2 v1.36.0 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.29.5 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.58 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.31 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.12 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.24.14 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.13 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.13 // indirect
+	github.com/aws/smithy-go v1.22.2 // indirect
+	github.com/coder/websocket v1.8.12 // indirect
+	github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6 // indirect
+	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect
+	github.com/digitalocean/go-smbios v0.0.0-20180907143718-390a4f403a8e // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
+	github.com/gaissmai/bart v0.18.0 // indirect
+	github.com/go-json-experiment/json v0.0.0-20250223041408-d3c622f1b874 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/godbus/dbus/v5 v5.1.1-0.20230522191255-76236955d466 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/google/btree v1.1.2 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/csrf v1.7.3-0.20250123201450-9dd6af1f6d30 // indirect
+	github.com/gorilla/securecookie v1.1.2 // indirect
+	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
+	github.com/illarion/gonotify/v3 v3.0.2 // indirect
+	github.com/insomniacslk/dhcp v0.0.0-20231206064809-8c70d406f6d2 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/jsimonetti/rtnetlink v1.4.0 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/kortschak/wol v0.0.0-20200729010619-da482cc4850a // indirect
+	github.com/mdlayher/genetlink v1.3.2 // indirect
+	github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42 // indirect
+	github.com/mdlayher/sdnotify v1.0.0 // indirect
+	github.com/mdlayher/socket v0.5.0 // indirect
+	github.com/miekg/dns v1.1.58 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.21 // indirect
+	github.com/prometheus-community/pro-bing v0.4.0 // indirect
+	github.com/safchain/ethtool v0.3.0 // indirect
+	github.com/tailscale/certstore v0.1.1-0.20231202035212-d3fa0460f47e // indirect
+	github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect
+	github.com/tailscale/goupnp v1.0.1-0.20210804011211-c64d0f06ea05 // indirect
+	github.com/tailscale/hujson v0.0.0-20221223112325-20486734a56a // indirect
+	github.com/tailscale/netlink v1.1.1-0.20240822203006-4d49adab4de7 // indirect
+	github.com/tailscale/peercred v0.0.0-20250107143737-35a0c7bd7edc // indirect
+	github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976 // indirect
+	github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19 // indirect
+	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
+	github.com/vishvananda/netns v0.0.4 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	go4.org/mem v0.0.0-20240501181205-ae6ca9944745 // indirect
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect
+	golang.org/x/crypto v0.49.0 // indirect
+	golang.org/x/exp v0.0.0-20250210185358-939b2ce775ac // indirect
+	golang.org/x/mod v0.34.0 // indirect
+	golang.org/x/net v0.52.0 // indirect
+	golang.org/x/sync v0.20.0 // indirect
+	golang.org/x/sys v0.42.0 // indirect
+	golang.org/x/term v0.41.0 // indirect
+	golang.org/x/text v0.35.0 // indirect
+	golang.org/x/time v0.10.0 // indirect
+	golang.org/x/tools v0.43.0 // indirect
+	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
+	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
+	gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633 // indirect
+)
--- a/ios/Go/go.sum
+++ b/ios/Go/go.sum
@ -0,0 +1,238 @@
+filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+filippo.io/mkcert v1.4.4 h1:8eVbbwfVlaqUM7OwuftKc2nuYOoTDQWqsoXmzoXZdbc=
+filippo.io/mkcert v1.4.4/go.mod h1:VyvOchVuAye3BoUsPUOOofKygVwLV2KQMVFJNRq+1dA=
+github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c h1:pxW6RcqyfI9/kWtOwnv/G+AzdKuy2ZrqINhenH4HyNs=
+github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/akutz/memconn v0.1.0 h1:NawI0TORU4hcOMsMr11g7vwlCdkYeLKXBcxWu2W/P8A=
+github.com/akutz/memconn v0.1.0/go.mod h1:Jo8rI7m0NieZyLI5e2CDlRdRqRRB4S7Xp77ukDjH+Fw=
+github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa h1:LHTHcTQiSGT7VVbI0o4wBRNQIgn917usHWOd6VAffYI=
+github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa/go.mod h1:cEWa1LVoE5KvSD9ONXsZrj0z6KqySlCCNKHlLzbqAt4=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/aws/aws-sdk-go-v2 v1.36.0 h1:b1wM5CcE65Ujwn565qcwgtOTT1aT4ADOHHgglKjG7fk=
+github.com/aws/aws-sdk-go-v2 v1.36.0/go.mod h1:5PMILGVKiW32oDzjj6RU52yrNrDPUHcbZQYr1sM7qmM=
+github.com/aws/aws-sdk-go-v2/config v1.29.5 h1:4lS2IB+wwkj5J43Tq/AwvnscBerBJtQQ6YS7puzCI1k=
+github.com/aws/aws-sdk-go-v2/config v1.29.5/go.mod h1:SNzldMlDVbN6nWxM7XsUiNXPSa1LWlqiXtvh/1PrJGg=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.58 h1:/d7FUpAPU8Lf2KUdjniQvfNdlMID0Sd9pS23FJ3SS9Y=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.58/go.mod h1:aVYW33Ow10CyMQGFgC0ptMRIqJWvJ4nxZb0sUiuQT/A=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27 h1:7lOW8NUwE9UZekS1DYoiPdVAqZ6A+LheHWb+mHbNOq8=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27/go.mod h1:w1BASFIPOPUae7AgaH4SbjNbfdkxuggLyGfNFTn8ITY=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31 h1:lWm9ucLSRFiI4dQQafLrEOmEDGry3Swrz0BIRdiHJqQ=
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+golang.org/x/sys v0.42.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/term v0.41.0 h1:QCgPso/Q3RTJx2Th4bDLqML4W6iJiaXFq2/ftQF13YU=
+golang.org/x/term v0.41.0/go.mod h1:3pfBgksrReYfZ5lvYM0kSO0LIkAl4Yl2bXOkKP7Ec2A=
+golang.org/x/text v0.35.0 h1:JOVx6vVDFokkpaq1AEptVzLTpDe9KGpj5tR4/X+ybL8=
+golang.org/x/text v0.35.0/go.mod h1:khi/HExzZJ2pGnjenulevKNX1W67CUy0AsXcNubPGCA=
+golang.org/x/time v0.10.0 h1:3usCWA8tQn0L8+hFJQNgzpWbd89begxN66o1Ojdn5L4=
+golang.org/x/time v0.10.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
+golang.org/x/tools v0.43.0 h1:12BdW9CeB3Z+J/I/wj34VMl8X+fEXBxVR90JeMX5E7s=
+golang.org/x/tools v0.43.0/go.mod h1:uHkMso649BX2cZK6+RpuIPXS3ho2hZo4FVwfoy1vIk0=
+golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 h1:B82qJJgjvYKsXS9jeunTOisW56dUokqW/FOteYJJ/yg=
+golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
+golang.zx2c4.com/wireguard/windows v0.5.3 h1:On6j2Rpn3OEMXqBq00QEDC7bWSZrPIHKIus8eIuExIE=
+golang.zx2c4.com/wireguard/windows v0.5.3/go.mod h1:9TEe8TJmtwyQebdFwAkEWOPr3prrtqm+REGFifP60hI=
+google.golang.org/protobuf v1.35.1 h1:m3LfL6/Ca+fqnjnlqQXNpFPABW1UD7mjh8KO2mKFytA=
+google.golang.org/protobuf v1.35.1/go.mod h1:9fA7Ob0pmnwhb644+1+CVWFRbNajQ6iRojtC/QF5bRE=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633 h1:2gap+Kh/3F47cO6hAu3idFvsJ0ue6TRcEi2IUkv/F8k=
+gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633/go.mod h1:5DMfjtclAbTIjbXqO1qCe2K5GKKxWz2JHvCChuTcJEM=
+honnef.co/go/tools v0.5.1 h1:4bH5o3b5ZULQ4UrBmP+63W9r7qIkqJClEA9ko5YKx+I=
+honnef.co/go/tools v0.5.1/go.mod h1:e9irvo83WDG9/irijV44wr3tbhcFeRnfpVlRqVwpzMs=
+howett.net/plist v1.0.0 h1:7CrbWYbPPO/PyNy38b2EB/+gYbjCe2DXBxgtOOZbSQM=
+howett.net/plist v1.0.0/go.mod h1:lqaXoTrLY4hg8tnEzNru53gicrbv7rrk+2xJA/7hw9g=
+software.sslmate.com/src/go-pkcs12 v0.4.0 h1:H2g08FrTvSFKUj+D309j1DPfk5APnIdAQAB8aEykJ5k=
+software.sslmate.com/src/go-pkcs12 v0.4.0/go.mod h1:Qiz0EyvDRJjjxGyUQa2cCNZn/wMyzrRJ/qcDXOQazLI=
+tailscale.com v1.82.0 h1:pposomel4h6Je4brJydcdc2ixNQWDaZyGr5v5MdRr/o=
+tailscale.com v1.82.0/go.mod h1:iU6kohVzG+bP0/5XjqBAnW8/6nSG/Du++bO+x7VJZD0=
--- a/ios/tailscale_kit.podspec
+++ b/ios/tailscale_kit.podspec
@ -0,0 +1,51 @@
+Pod::Spec.new do |s|
+  s.name             = 'tailscale_kit'
+  s.version          = '0.1.0'
+  s.summary          = 'Embedded Tailscale tsnet for Flutter'
+  s.description      = <<-DESC
+Provides a WireGuard tunnel to Constellation heaters via embedded tsnet.
+Built with go build -buildmode=c-archive (production Go approach).
+No VPN entitlement needed — uses userspace netstack.
+                       DESC
+  s.homepage         = 'https://github.com/constellation-heating/tailscale-kit'
+  s.license          = { :type => 'MIT' }
+  s.author           = { 'Constellation Heating' => 'dev@constellation-heating.com' }
+  s.source           = { :path => '.' }
+  s.source_files     = 'Classes/**/*.{swift,h}'
+  s.public_header_files = 'Classes/**/*.h'
+  s.preserve_paths   = 'TailscaleKit.xcframework'
+  s.dependency 'Flutter'
+  s.platform         = :ios, '14.0'
+  s.swift_version    = '5.0'
+
+  s.libraries        = 'resolv'
+
+  s.pod_target_xcconfig = {
+    'DEFINES_MODULE' => 'YES',
+    'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386 x86_64',
+    # Force-link the Go static library into this pod's dynamic framework
+    'OTHER_LDFLAGS' => '$(inherited) -force_load "$(PODS_TARGET_SRCROOT)/_current_slice/TailscaleKit.framework/TailscaleKit"',
+  }
+
+  s.user_target_xcconfig = {
+    'EXCLUDED_ARCHS[sdk=iphonesimulator*]' => 'i386 x86_64',
+  }
+
+  # Before compile: symlink the correct xcframework slice for the current platform
+  s.script_phase = {
+    :name => 'Select TailscaleKit Slice',
+    :script => <<-'SCRIPT',
+      PLUGIN_DIR="${PODS_TARGET_SRCROOT}"
+      LINK="${PLUGIN_DIR}/_current_slice"
+      rm -f "$LINK"
+
+      if [ "$PLATFORM_NAME" = "iphonesimulator" ]; then
+        ln -sf "TailscaleKit.xcframework/ios-arm64-simulator" "$LINK"
+      else
+        ln -sf "TailscaleKit.xcframework/ios-arm64" "$LINK"
+      fi
+      echo "TailscaleKit: selected $PLATFORM_NAME slice"
+    SCRIPT
+    :execution_position => :before_compile,
+  }
+end
--- a/lib/tailscale_kit.dart
+++ b/lib/tailscale_kit.dart
@ -0,0 +1,150 @@
+import 'dart:convert';
+
+import 'package:flutter/services.dart';
+
+/// Embedded Tailscale tsnet client for Flutter.
+///
+/// Provides a WireGuard tunnel to Constellation heaters via Tailscale,
+/// without requiring the user to install the Tailscale app.
+///
+/// Architecture: Go xcframework (tsnet) ↔ Swift bridge ↔ MethodChannel ↔ Dart
+///
+/// Usage:
+/// ```dart
+/// final ts = TailscaleKit();
+/// await ts.start(authKey: 'tskey-auth-...');
+/// final port = await ts.startProxy('100.64.0.5');
+/// grpcService.connect('127.0.0.1', port: port);
+/// ```
+class TailscaleKit {
+  static const _channel = MethodChannel('tailscale_kit');
+
+  /// Join the Tailnet with the given auth key.
+  ///
+  /// [authKey] is a Tailscale auth key (reusable, tag-scoped).
+  /// [hostname] is the name this device will appear as in the Tailnet.
+  ///
+  /// The auth key is typically received from the heater during BLE provisioning.
+  /// State is persisted to the app's documents directory so the device
+  /// identity survives app restarts.
+  Future<void> start({
+    required String authKey,
+    String hostname = 'constellation-phone',
+  }) async {
+    await _channel.invokeMethod('start', {
+      'authKey': authKey,
+      'hostname': hostname,
+    });
+  }
+
+  /// Create a localhost TCP proxy to a heater's Tailscale IP.
+  ///
+  /// Returns the local port number. Connect gRPC to `127.0.0.1:<port>`.
+  /// Traffic is forwarded through the Tailscale WireGuard tunnel to
+  /// [heaterTailscaleIP]:[port] on the heater.
+  ///
+  /// Uses userspace netstack — no VPN entitlement needed on iOS.
+  Future<int> startProxy(String heaterTailscaleIP, {int port = 5050}) async {
+    final localPort = await _channel.invokeMethod<int>('startProxy', {
+      'ip': heaterTailscaleIP,
+      'port': port,
+    });
+    return localPort!;
+  }
+
+  /// Stop the local TCP proxy.
+  Future<void> stopProxy() async {
+    await _channel.invokeMethod('stopProxy');
+  }
+
+  /// Disconnect from the Tailnet and clean up.
+  Future<void> stop() async {
+    await _channel.invokeMethod('stop');
+  }
+
+  /// Get the current Tailscale connection status.
+  Future<TailscaleStatus> status() async {
+    final json = await _channel.invokeMethod<String>('status');
+    if (json == null) {
+      return TailscaleStatus(state: TailscaleState.stopped);
+    }
+    return TailscaleStatus.fromJson(jsonDecode(json) as Map<String, dynamic>);
+  }
+
+  /// Get this device's Tailscale IPv4 address (100.x.x.x).
+  Future<String> tailscaleIP() async {
+    final ip = await _channel.invokeMethod<String>('tailscaleIP');
+    return ip!;
+  }
+}
+
+enum TailscaleState {
+  stopped,
+  starting,
+  running,
+  needsLogin,
+}
+
+class TailscaleStatus {
+  final TailscaleState state;
+  final String? selfIP;
+  final String? backendState;
+  final List<TailscalePeer> peers;
+
+  TailscaleStatus({
+    required this.state,
+    this.selfIP,
+    this.backendState,
+    this.peers = const [],
+  });
+
+  factory TailscaleStatus.fromJson(Map<String, dynamic> json) {
+    final backendState = json['BackendState'] as String? ?? '';
+    final state = switch (backendState) {
+      'Running' => TailscaleState.running,
+      'Starting' => TailscaleState.starting,
+      'NeedsLogin' || 'NeedsMachineAuth' => TailscaleState.needsLogin,
+      _ => TailscaleState.stopped,
+    };
+
+    final selfNode = json['Self'] as Map<String, dynamic>?;
+    final selfIP = selfNode?['TailscaleIPs'] is List
+        ? (selfNode!['TailscaleIPs'] as List).firstOrNull as String?
+        : null;
+
+    final peerMap = json['Peer'] as Map<String, dynamic>? ?? {};
+    final peers = peerMap.values
+        .map((p) => TailscalePeer.fromJson(p as Map<String, dynamic>))
+        .toList();
+
+    return TailscaleStatus(
+      state: state,
+      selfIP: selfIP,
+      backendState: backendState,
+      peers: peers,
+    );
+  }
+
+  bool get isRunning => state == TailscaleState.running;
+}
+
+class TailscalePeer {
+  final String hostname;
+  final List<String> tailscaleIPs;
+  final bool online;
+
+  TailscalePeer({
+    required this.hostname,
+    required this.tailscaleIPs,
+    required this.online,
+  });
+
+  factory TailscalePeer.fromJson(Map<String, dynamic> json) {
+    final ips = json['TailscaleIPs'] as List? ?? [];
+    return TailscalePeer(
+      hostname: json['HostName'] as String? ?? '',
+      tailscaleIPs: ips.map((ip) => ip as String).toList(),
+      online: json['Online'] as bool? ?? false,
+    );
+  }
+}
--- a/pubspec.lock
+++ b/pubspec.lock
@ -0,0 +1,205 @@
+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "758e6d74e971c3e5aceb4110bfd6698efc7f501675bcfe0c775459a8140750eb"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.13.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "8aab1771e1243a5063b8b0ff68042d67334e3feab9e95b9490f9a6ebf73b42ea"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.2"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: faf38497bda5ead2a8c7615f4f7939df04333478bf32e4173fcb06d428b5716b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: fddb70d9b5277016c77a80201021d40a2247104d9f4aa7bab7157b7e3f05b84b
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: "2f5709ae4d3d59dd8f7cd309b4e023046b57d8a6c82130785d2b0e5868084e76"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.19.1"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "5368f224a74523e8d2e7399ea1638b37aecfca824a3cc4dfdf77bf1fa905ac44"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.3"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: "3105dc8492f6183fb076ccf1f351ac3d60564bff92e20bfc4af9cc1651f4e7e1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.0.0"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  leak_tracker:
+    dependency: transitive
+    description:
+      name: leak_tracker
+      sha256: "33e2e26bdd85a0112ec15400c8cbffea70d0f9c3407491f672a2fad47915e2de"
+      url: "https://pub.dev"
+    source: hosted
+    version: "11.0.2"
+  leak_tracker_flutter_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_flutter_testing
+      sha256: "1dbc140bb5a23c75ea9c4811222756104fbcd1a27173f0c34ca01e16bea473c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.10"
+  leak_tracker_testing:
+    dependency: transitive
+    description:
+      name: leak_tracker_testing
+      sha256: "8d5a2d49f4a66b49744b23b018848400d23e54caf9463f4eb20df3eb8acb2eb1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.2"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "12f842a479589fea194fe5c5a3095abc7be0c1f2ddfa9a0e76aed1dbd26a87df"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.0"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: dc0b7dc7651697ea4ff3e69ef44b0407ea32c487a39fff6a4004fa585e901861
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.12.19"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "9c337007e82b1889149c82ed242ed1cb24a66044e30979c44912381e9be4c48b"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.13.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: "23f08335362185a5ea2ad3a4e597f1375e78bce8a040df5c600c8d3552ef2394"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.17.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "75cca69d1490965be98c73ceaea117e8a04dd21217b37b292c9ddbec0d955bc5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.9.1"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "56a02f1f4cd1a2d96303c0144c93bd6d909eea6bee6bf5a0e0b685edbd4c47ab"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.10.2"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "8b27215b45d22309b5cddda1aa2b19bdfec9df0e765f2de506401c071d38d1b1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.12.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: "969e04c80b8bcdf826f8f16579c7b14d780458bd97f56d107d3950fdbeef059d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.1.4"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "921cd31725b72fe181906c6a94d987c78e3b98c2e205b397ea399d4054872b43"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.4.1"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: "7f554798625ea768a7518313e58f83891c7f5024f88e46e7182a4558850a4b8e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.2.2"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "8161c84903fd860b26bfdefb7963b3f0b68fee7adea0f59ef805ecca346f0c7a"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.7.10"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: d530bd74fea330e6e364cda7a85019c434070188383e1cd8d9777ee586914c5b
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
+  vm_service:
+    dependency: transitive
+    description:
+      name: vm_service
+      sha256: "45caa6c5917fa127b5dbcfbd1fa60b14e583afdc08bfc96dda38886ca252eb60"
+      url: "https://pub.dev"
+    source: hosted
+    version: "15.0.2"
+sdks:
+  dart: ">=3.10.1 <4.0.0"
+  flutter: ">=3.18.0-18.0.pre.54"
--- a/pubspec.yaml
+++ b/pubspec.yaml
@ -0,0 +1,23 @@
+name: tailscale_kit
+description: Embedded Tailscale tsnet for Flutter — provides WireGuard tunnel to Constellation heaters without requiring the Tailscale app.
+version: 0.1.0
+publish_to: 'none'
+
+environment:
+  sdk: ^3.10.1
+  flutter: '>=3.10.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^6.0.0
+
+flutter:
+  plugin:
+    platforms:
+      ios:
+        pluginClass: TailscaleKitPlugin
--- a/test/go.mod
+++ b/test/go.mod
@ -0,0 +1,83 @@
+module github.com/constellation-heating/tailscale-kit/test
+
+go 1.24.0
+
+require tailscale.com v1.82.0
+
+require (
+	filippo.io/edwards25519 v1.1.0 // indirect
+	github.com/akutz/memconn v0.1.0 // indirect
+	github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa // indirect
+	github.com/aws/aws-sdk-go-v2 v1.36.0 // indirect
+	github.com/aws/aws-sdk-go-v2/config v1.29.5 // indirect
+	github.com/aws/aws-sdk-go-v2/credentials v1.17.58 // indirect
+	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.31 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.12 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sso v1.24.14 // indirect
+	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.13 // indirect
+	github.com/aws/aws-sdk-go-v2/service/sts v1.33.13 // indirect
+	github.com/aws/smithy-go v1.22.2 // indirect
+	github.com/coder/websocket v1.8.12 // indirect
+	github.com/coreos/go-iptables v0.7.1-0.20240112124308-65c67c9f46e6 // indirect
+	github.com/dblohm7/wingoes v0.0.0-20240119213807-a09d6be7affa // indirect
+	github.com/digitalocean/go-smbios v0.0.0-20180907143718-390a4f403a8e // indirect
+	github.com/fxamacker/cbor/v2 v2.7.0 // indirect
+	github.com/gaissmai/bart v0.18.0 // indirect
+	github.com/go-json-experiment/json v0.0.0-20250223041408-d3c622f1b874 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/godbus/dbus/v5 v5.1.1-0.20230522191255-76236955d466 // indirect
+	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/google/btree v1.1.2 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 // indirect
+	github.com/google/uuid v1.6.0 // indirect
+	github.com/gorilla/csrf v1.7.3-0.20250123201450-9dd6af1f6d30 // indirect
+	github.com/gorilla/securecookie v1.1.2 // indirect
+	github.com/hdevalence/ed25519consensus v0.2.0 // indirect
+	github.com/illarion/gonotify/v3 v3.0.2 // indirect
+	github.com/insomniacslk/dhcp v0.0.0-20231206064809-8c70d406f6d2 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/jsimonetti/rtnetlink v1.4.0 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
+	github.com/kortschak/wol v0.0.0-20200729010619-da482cc4850a // indirect
+	github.com/mdlayher/genetlink v1.3.2 // indirect
+	github.com/mdlayher/netlink v1.7.3-0.20250113171957-fbb4dce95f42 // indirect
+	github.com/mdlayher/sdnotify v1.0.0 // indirect
+	github.com/mdlayher/socket v0.5.0 // indirect
+	github.com/miekg/dns v1.1.58 // indirect
+	github.com/mitchellh/go-ps v1.0.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.21 // indirect
+	github.com/prometheus-community/pro-bing v0.4.0 // indirect
+	github.com/safchain/ethtool v0.3.0 // indirect
+	github.com/tailscale/certstore v0.1.1-0.20231202035212-d3fa0460f47e // indirect
+	github.com/tailscale/go-winio v0.0.0-20231025203758-c4f33415bf55 // indirect
+	github.com/tailscale/goupnp v1.0.1-0.20210804011211-c64d0f06ea05 // indirect
+	github.com/tailscale/hujson v0.0.0-20221223112325-20486734a56a // indirect
+	github.com/tailscale/netlink v1.1.1-0.20240822203006-4d49adab4de7 // indirect
+	github.com/tailscale/peercred v0.0.0-20250107143737-35a0c7bd7edc // indirect
+	github.com/tailscale/web-client-prebuilt v0.0.0-20250124233751-d4cd19a26976 // indirect
+	github.com/tailscale/wireguard-go v0.0.0-20250107165329-0b8b35511f19 // indirect
+	github.com/u-root/uio v0.0.0-20240224005618-d2acac8f3701 // indirect
+	github.com/vishvananda/netns v0.0.4 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
+	go4.org/mem v0.0.0-20240501181205-ae6ca9944745 // indirect
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect
+	golang.org/x/crypto v0.35.0 // indirect
+	golang.org/x/exp v0.0.0-20250210185358-939b2ce775ac // indirect
+	golang.org/x/mod v0.23.0 // indirect
+	golang.org/x/net v0.36.0 // indirect
+	golang.org/x/sync v0.11.0 // indirect
+	golang.org/x/sys v0.30.0 // indirect
+	golang.org/x/term v0.29.0 // indirect
+	golang.org/x/text v0.22.0 // indirect
+	golang.org/x/time v0.10.0 // indirect
+	golang.org/x/tools v0.30.0 // indirect
+	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
+	golang.zx2c4.com/wireguard/windows v0.5.3 // indirect
+	gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633 // indirect
+)
--- a/test/go.sum
+++ b/test/go.sum
@ -0,0 +1,238 @@
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+filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
+filippo.io/mkcert v1.4.4 h1:8eVbbwfVlaqUM7OwuftKc2nuYOoTDQWqsoXmzoXZdbc=
+filippo.io/mkcert v1.4.4/go.mod h1:VyvOchVuAye3BoUsPUOOofKygVwLV2KQMVFJNRq+1dA=
+github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c h1:pxW6RcqyfI9/kWtOwnv/G+AzdKuy2ZrqINhenH4HyNs=
+github.com/BurntSushi/toml v1.4.1-0.20240526193622-a339e1f7089c/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
+github.com/akutz/memconn v0.1.0 h1:NawI0TORU4hcOMsMr11g7vwlCdkYeLKXBcxWu2W/P8A=
+github.com/akutz/memconn v0.1.0/go.mod h1:Jo8rI7m0NieZyLI5e2CDlRdRqRRB4S7Xp77ukDjH+Fw=
+github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa h1:LHTHcTQiSGT7VVbI0o4wBRNQIgn917usHWOd6VAffYI=
+github.com/alexbrainman/sspi v0.0.0-20231016080023-1a75b4708caa/go.mod h1:cEWa1LVoE5KvSD9ONXsZrj0z6KqySlCCNKHlLzbqAt4=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be h1:9AeTilPcZAjCFIImctFaOjnTIavg87rW78vTPkQqLI8=
+github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be/go.mod h1:ySMOLuWl6zY27l47sB3qLNK6tF2fkHG55UZxx8oIVo4=
+github.com/aws/aws-sdk-go-v2 v1.36.0 h1:b1wM5CcE65Ujwn565qcwgtOTT1aT4ADOHHgglKjG7fk=
+github.com/aws/aws-sdk-go-v2 v1.36.0/go.mod h1:5PMILGVKiW32oDzjj6RU52yrNrDPUHcbZQYr1sM7qmM=
+github.com/aws/aws-sdk-go-v2/config v1.29.5 h1:4lS2IB+wwkj5J43Tq/AwvnscBerBJtQQ6YS7puzCI1k=
+github.com/aws/aws-sdk-go-v2/config v1.29.5/go.mod h1:SNzldMlDVbN6nWxM7XsUiNXPSa1LWlqiXtvh/1PrJGg=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.58 h1:/d7FUpAPU8Lf2KUdjniQvfNdlMID0Sd9pS23FJ3SS9Y=
+github.com/aws/aws-sdk-go-v2/credentials v1.17.58/go.mod h1:aVYW33Ow10CyMQGFgC0ptMRIqJWvJ4nxZb0sUiuQT/A=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27 h1:7lOW8NUwE9UZekS1DYoiPdVAqZ6A+LheHWb+mHbNOq8=
+github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.27/go.mod h1:w1BASFIPOPUae7AgaH4SbjNbfdkxuggLyGfNFTn8ITY=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31 h1:lWm9ucLSRFiI4dQQafLrEOmEDGry3Swrz0BIRdiHJqQ=
+github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.31/go.mod h1:Huu6GG0YTfbPphQkDSo4dEGmQRTKb9k9G7RdtyQWxuI=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.31 h1:ACxDklUKKXb48+eg5ROZXi1vDgfMyfIA/WyvqHcHI0o=
+github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.31/go.mod h1:yadnfsDwqXeVaohbGc/RaD287PuyRw2wugkh5ZL2J6k=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2 h1:Pg9URiobXy85kgFev3og2CuOZ8JZUBENF+dcgWBaYNk=
+github.com/aws/aws-sdk-go-v2/internal/ini v1.8.2/go.mod h1:FbtygfRFze9usAadmnGJNc8KsP346kEe+y2/oyhGAGc=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2 h1:D4oz8/CzT9bAEYtVhSBmFj2dNOtaHOtMKc2vHBwYizA=
+github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.12.2/go.mod h1:Za3IHqTQ+yNcRHxu1OFucBh0ACZT4j4VQFF0BqpZcLY=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.12 h1:O+8vD2rGjfihBewr5bT+QUfYUHIxCVgG61LHoT59shM=
+github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.12.12/go.mod h1:usVdWJaosa66NMvmCrr08NcWDBRv4E6+YFG2pUdw1Lk=
+github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7 h1:a8HvP/+ew3tKwSXqL3BCSjiuicr+XTU2eFYeogV9GJE=
+github.com/aws/aws-sdk-go-v2/service/ssm v1.44.7/go.mod h1:Q7XIWsMo0JcMpI/6TGD6XXcXcV1DbTj6e9BKNntIMIM=
+github.com/aws/aws-sdk-go-v2/service/sso v1.24.14 h1:c5WJ3iHz7rLIgArznb3JCSQT3uUMiz9DLZhIX+1G8ok=
+github.com/aws/aws-sdk-go-v2/service/sso v1.24.14/go.mod h1:+JJQTxB6N4niArC14YNtxcQtwEqzS3o9Z32n7q33Rfs=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.13 h1:f1L/JtUkVODD+k1+IiSJUUv8A++2qVr+Xvb3xWXETMU=
+github.com/aws/aws-sdk-go-v2/service/ssooidc v1.28.13/go.mod h1:tvqlFoja8/s0o+UruA1Nrezo/df0PzdunMDDurUfg6U=
+github.com/aws/aws-sdk-go-v2/service/sts v1.33.13 h1:3LXNnmtH3TURctC23hnC0p/39Q5gre3FI7BNOiDcVWc=
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+github.com/aws/smithy-go v1.22.2/go.mod h1:irrKGvNn1InZwb2d7fkIRNucdfwR8R+Ts3wxYa/cJHg=
+github.com/cilium/ebpf v0.15.0 h1:7NxJhNiBT3NG8pZJ3c+yfrVdHY8ScgKD27sScgjLMMk=
+github.com/cilium/ebpf v0.15.0/go.mod h1:DHp1WyrLeiBh19Cf/tfiSMhqheEiK8fXFZ4No0P1Hso=
+github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
+github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
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+github.com/creack/pty v1.1.23 h1:4M6+isWdcStXEf15G/RbrMPOQj1dZ7HPZCGwE4kOeP0=
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+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
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+github.com/gaissmai/bart v0.18.0/go.mod h1:JJzMAhNF5Rjo4SF4jWBrANuJfqY+FvsFhW7t1UZJ+XY=
+github.com/github/fakeca v0.1.0 h1:Km/MVOFvclqxPM9dZBC4+QE564nU4gz4iZ0D9pMw28I=
+github.com/github/fakeca v0.1.0/go.mod h1:+bormgoGMMuamOscx7N91aOuUST7wdaJ2rNjeohylyo=
+github.com/go-json-experiment/json v0.0.0-20250223041408-d3c622f1b874 h1:F8d1AJ6M9UQCavhwmO6ZsrYLfG8zVFWfEfMS2MXPkSY=
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+github.com/google/gofuzz v1.2.0 h1:xRy4A+RhZaiKjJ1bPfwQ8sedCA+YS2YcCHW6ec7JMi0=
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+github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806 h1:wG8RYIyctLhdFk6Vl1yPGtSRtwGpVkWyZww1OCil2MI=
+github.com/google/nftables v0.2.1-0.20240414091927-5e242ec57806/go.mod h1:Beg6V6zZ3oEn0JuiUQ4wqwuyqqzasOltcoXPtgLbFp4=
+github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
+github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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+github.com/gorilla/csrf v1.7.3-0.20250123201450-9dd6af1f6d30/go.mod h1:F1Fj3KG23WYHE6gozCmBAezKookxbIvUJT+121wTuLk=
+github.com/gorilla/securecookie v1.1.2 h1:YCIWL56dvtr73r6715mJs5ZvhtnY73hBvEF8kXD8ePA=
+github.com/gorilla/securecookie v1.1.2/go.mod h1:NfCASbcHqRSY+3a8tlWJwsQap2VX5pwzwo4h3eOamfo=
+github.com/hdevalence/ed25519consensus v0.2.0 h1:37ICyZqdyj0lAZ8P4D1d1id3HqbbG1N3iBb1Tb4rdcU=
+github.com/hdevalence/ed25519consensus v0.2.0/go.mod h1:w3BHWjwJbFU29IRHL1Iqkw3sus+7FctEyM4RqDxYNzo=
+github.com/illarion/gonotify/v3 v3.0.2 h1:O7S6vcopHexutmpObkeWsnzMJt/r1hONIEogeVNmJMk=
+github.com/illarion/gonotify/v3 v3.0.2/go.mod h1:HWGPdPe817GfvY3w7cx6zkbzNZfi3QjcBm/wgVvEL1U=
+github.com/insomniacslk/dhcp v0.0.0-20231206064809-8c70d406f6d2 h1:9K06NfxkBh25x56yVhWWlKFE8YpicaSfHwoV8SFbueA=
+github.com/insomniacslk/dhcp v0.0.0-20231206064809-8c70d406f6d2/go.mod h1:3A9PQ1cunSDF/1rbTq99Ts4pVnycWg+vlPkfeD2NLFI=
+github.com/jellydator/ttlcache/v3 v3.1.0 h1:0gPFG0IHHP6xyUyXq+JaD8fwkDCqgqwohXNJBcYE71g=
+github.com/jellydator/ttlcache/v3 v3.1.0/go.mod h1:hi7MGFdMAwZna5n2tuvh63DvFLzVKySzCVW6+0gA2n4=
+github.com/jmespath/go-jmespath v0.4.0 h1:BEgLn5cpjn8UN1mAw4NjwDrS35OdebyEtFe+9YPoQUg=
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+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633 h1:2gap+Kh/3F47cO6hAu3idFvsJ0ue6TRcEi2IUkv/F8k=
+gvisor.dev/gvisor v0.0.0-20250205023644-9414b50a5633/go.mod h1:5DMfjtclAbTIjbXqO1qCe2K5GKKxWz2JHvCChuTcJEM=
+honnef.co/go/tools v0.5.1 h1:4bH5o3b5ZULQ4UrBmP+63W9r7qIkqJClEA9ko5YKx+I=
+honnef.co/go/tools v0.5.1/go.mod h1:e9irvo83WDG9/irijV44wr3tbhcFeRnfpVlRqVwpzMs=
+howett.net/plist v1.0.0 h1:7CrbWYbPPO/PyNy38b2EB/+gYbjCe2DXBxgtOOZbSQM=
+howett.net/plist v1.0.0/go.mod h1:lqaXoTrLY4hg8tnEzNru53gicrbv7rrk+2xJA/7hw9g=
+software.sslmate.com/src/go-pkcs12 v0.4.0 h1:H2g08FrTvSFKUj+D309j1DPfk5APnIdAQAB8aEykJ5k=
+software.sslmate.com/src/go-pkcs12 v0.4.0/go.mod h1:Qiz0EyvDRJjjxGyUQa2cCNZn/wMyzrRJ/qcDXOQazLI=
+tailscale.com v1.82.0 h1:pposomel4h6Je4brJydcdc2ixNQWDaZyGr5v5MdRr/o=
+tailscale.com v1.82.0/go.mod h1:iU6kohVzG+bP0/5XjqBAnW8/6nSG/Du++bO+x7VJZD0=
--- a/test/main.go
+++ b/test/main.go
@ -0,0 +1,144 @@
+// Standalone test for the tsnet proxy — verifies the Go layer works
+// without needing the Flutter app or iOS build.
+//
+// Usage:
+//   cd tailscale_kit/test
+//   go run tsnet_test.go \
+//     -authkey=tskey-auth-xxxxx \
+//     -heater-ip=100.x.x.x \
+//     -heater-port=5050
+//
+// This will:
+//   1. Join the Tailnet with the given auth key
+//   2. Open a local TCP proxy to the heater's Tailscale IP
+//   3. Make a raw TCP connection through the proxy to verify connectivity
+//   4. Print the result and clean up
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"time"
+
+	"tailscale.com/tsnet"
+)
+
+func main() {
+	authKey := flag.String("authkey", "", "Tailscale auth key for the phone/test client")
+	heaterIP := flag.String("heater-ip", "", "Heater's Tailscale IP (100.x.x.x)")
+	heaterPort := flag.Int("heater-port", 5050, "Heater's gRPC port")
+	flag.Parse()
+
+	if *authKey == "" || *heaterIP == "" {
+		fmt.Fprintf(os.Stderr, "Usage: go run tsnet_test.go -authkey=tskey-auth-xxx -heater-ip=100.x.x.x\n")
+		os.Exit(1)
+	}
+
+	// Create temp state dir
+	stateDir, err := os.MkdirTemp("", "tsnet-test-*")
+	if err != nil {
+		log.Fatalf("Failed to create state dir: %v", err)
+	}
+	defer os.RemoveAll(stateDir)
+
+	// Step 1: Start tsnet
+	log.Println("[1/4] Starting tsnet...")
+	s := &tsnet.Server{
+		Dir:       stateDir,
+		Hostname:  "constellation-test-client",
+		AuthKey:   *authKey,
+		Ephemeral: true, // don't persist for tests
+	}
+
+	if err := s.Start(); err != nil {
+		log.Fatalf("tsnet start failed: %v", err)
+	}
+	defer s.Close()
+
+	// Get our Tailscale IP
+	lc, err := s.LocalClient()
+	if err != nil {
+		log.Fatalf("local client: %v", err)
+	}
+	st, err := lc.Status(context.Background())
+	if err != nil {
+		log.Fatalf("status: %v", err)
+	}
+	log.Printf("[1/4] Connected to tailnet. Our IP: %v", st.Self.TailscaleIPs)
+
+	// Step 2: Start local proxy
+	log.Println("[2/4] Starting local proxy...")
+	ln, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		log.Fatalf("listen: %v", err)
+	}
+	defer ln.Close()
+
+	localPort := ln.Addr().(*net.TCPAddr).Port
+	remoteAddr := fmt.Sprintf("%s:%d", *heaterIP, *heaterPort)
+	log.Printf("[2/4] Proxy: 127.0.0.1:%d → %s (via Tailscale)", localPort, remoteAddr)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	// Accept one connection for the test
+	go func() {
+		conn, err := ln.Accept()
+		if err != nil {
+			return
+		}
+		defer conn.Close()
+
+		remote, err := s.Dial(ctx, "tcp", remoteAddr)
+		if err != nil {
+			log.Printf("[PROXY] Dial failed: %v", err)
+			return
+		}
+		defer remote.Close()
+
+		done := make(chan struct{}, 2)
+		go func() { io.Copy(remote, conn); done <- struct{}{} }()
+		go func() { io.Copy(conn, remote); done <- struct{}{} }()
+		<-done
+	}()
+
+	// Step 3: Connect through the proxy
+	log.Println("[3/4] Testing TCP connection through proxy...")
+	conn, err := net.DialTimeout("tcp", fmt.Sprintf("127.0.0.1:%d", localPort), 10*time.Second)
+	if err != nil {
+		log.Fatalf("FAIL — could not connect through proxy: %v", err)
+	}
+	defer conn.Close()
+
+	// For gRPC/HTTP2, we can just check that the TCP connection succeeds
+	// and the remote end responds (gRPC sends a settings frame)
+	conn.SetReadDeadline(time.Now().Add(5 * time.Second))
+	buf := make([]byte, 64)
+	n, err := conn.Read(buf)
+	if err != nil && err != io.EOF {
+		// Timeout is OK — gRPC server waits for client to send first
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			log.Println("[3/4] TCP connection established (gRPC server awaiting client preface)")
+		} else {
+			log.Printf("[3/4] Read response: %v (this may be OK for gRPC)", err)
+		}
+	} else {
+		log.Printf("[3/4] Received %d bytes from heater", n)
+	}
+
+	// Step 4: Result
+	log.Println("[4/4] SUCCESS — Tailscale tunnel is working!")
+	log.Printf("")
+	log.Printf("  Heater reachable at %s via Tailscale", remoteAddr)
+	log.Printf("  Local proxy: 127.0.0.1:%d", localPort)
+	log.Printf("")
+	log.Printf("  Next: use this in the Flutter app:")
+	log.Printf("    await tailscaleKit.start(authKey: '%s');", *authKey)
+	log.Printf("    final port = await tailscaleKit.startProxy('%s');", *heaterIP)
+	log.Printf("    grpcService.connect('127.0.0.1', port: port);")
+}