NMEA Simulator

A simple SwiftUI macOS app that simulates a GPS source over TCP by streaming NMEA 0183 sentences.

Clients can connect to the configured local IP and port to receive live simulated GPS output (GPRMC and GPGGA).

What It Does

• Runs a TCP server for NMEA clients
• Sends periodic GPS sentences at a configurable rate
• Lets you set latitude, longitude, altitude, speed, and course
• Supports optional movement simulation
• Includes a map dialog to set/reset start position

Requirements

• macOS
• Xcode 15+ (or newer)

Run

1. Open NMEA Simulator.xcodeproj in Xcode.
2. Select the NMEA Simulator scheme.
3. Build and run on macOS.

Basic Usage

1. Set network and GPS values in the app.
2. Click Start Server.
3. Connect your NMEA client to <local-ip>:<port>.
4. Watch incoming NMEA sentences in your client (and optionally in the app log).

Notes

• The app listens on all interfaces (0.0.0.0) and displays the active local IP for convenience.
• Network client/server entitlements are enabled for sandboxed macOS execution.