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‎.gitignore

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/target
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**/*.rs.bk

‎Cargo.lock

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‎Cargo.toml

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[package]
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name = "frakegps"
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version = "0.1.0"
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authors = ["Francesco Frassinelli <fraph24@gmail.com>"]
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edition = "2018"
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[dependencies]
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time = "0.1"
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web-view = "0.4.1"

‎README.md

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# Description
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FrakeGPS simulates a simple GPS receiver which emits NMEA codes. The location is selected clicking on a map, using [web-view](https://github.com/Boscop/web-view) and [Leaflet](http://leafletjs.com/).
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![frakegps-gpsmon](https://user-images.githubusercontent.com/4068/58375414-ba3b3900-7f52-11e9-88bb-c6db1299eff0.png)
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# Build
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## Dependencies
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- cargo
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- gpsd
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- webkit2gtk (devel)
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### Fedora
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```
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dnf install cargo gpsd webkit2gtk3-devel
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```
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## Compile
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```
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cargo build
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```
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# Usage
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## Usage with gpsd
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```
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./target/debug/frakegps |& gpsd -n -N /dev/stdin
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```
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## Usage with geoclue
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```
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./target/debug/frakegps |& nc -kl 10110
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avahi-publish -s "FrakeGPS for $(hostname)" _nmea-0183._tcp 10110 "FrakeGPS service"
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```
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Note: Unreliable results with avahi.

‎src/dist/map.css

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body {
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margin: 0;
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height: 100vh;
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display: flex;
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flex-direction: column;
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}
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#map {
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flex-grow: 1;
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width: 100%;
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}

‎src/dist/map.html

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<!DOCTYPE html>
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<html>
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<head>
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<title>FrakeGPS</title>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" />
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<link rel="stylesheet" href="https://unpkg.com/leaflet@1.5.1/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
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<script src="https://unpkg.com/leaflet@1.5.1/dist/leaflet.js" integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og==" crossorigin=""></script>
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{styles}
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</head>
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<body>
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<div id="map"></div>
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{scripts}
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</body>
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</html>
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‎src/dist/map.js

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var map = L.map('map').setView([63.42682, 10.40163], 13);
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L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
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maxZoom: 18,
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attribution: 'Map data © <a href="https://openstreetmap.org">OpenStreetMap</a> contributors',
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id: 'osm.standard'
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}).addTo(map);
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var maker = L.marker();
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map.on('click', function(event) {
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maker.remove()
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maker = L.marker(event.latlng);
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maker.addTo(map);
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external.invoke([event.latlng.lat, event.latlng.lng]);
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});

‎src/main.rs

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mod nmea;
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extern crate web_view;
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use web_view::*;
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fn main() -> WVResult {
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let html = format!(include_str!("dist/map.html"),
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styles = inline_style(include_str!("dist/map.css")),
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scripts = inline_script(include_str!("dist/map.js")),
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);
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let webview = web_view::builder()
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.title("FrakeGPS")
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.content(Content::Html(html))
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.size(800, 600)
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.resizable(true)
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.debug(true)
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.user_data(())
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.invoke_handler(|_webview, arg| {
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let latlon: Vec<&str> = arg.split(",").collect();
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let lat: f64 = latlon[0].parse().unwrap();
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let lon: f64 = latlon[1].parse().unwrap();
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println!("{}", nmea::rmc(lat, lon));
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Ok(())
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})
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.build()?;
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webview.run()
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}
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fn inline_style(s: &str) -> String {
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format!(r#"<style type="text/css">{}</style>"#, s)
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}
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fn inline_script(s: &str) -> String {
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format!(r#"<script type="text/javascript">{}</script>"#, s)
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}

‎src/nmea.rs

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extern crate time;
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fn dec_to_dm(dec: f64) -> f64 {
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let deg = dec.abs().floor();
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let min = (dec-deg)*60.0/100.0;
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deg+min
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}
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fn checksum(message: &String) -> String {
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let mut checksum = 0;
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for character in message.bytes() {
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checksum ^= character;
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}
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format!("{:02X}", checksum)
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}
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pub fn rmc(lat: f64, lon: f64) -> String {
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let lat_nmea = format!("{:08.3}", dec_to_dm(lat)*100.0);
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let lon_nmea = format!("{:09.3}", dec_to_dm(lon)*100.0);
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let ns = if lat.is_sign_negative() { 'S' } else { 'N' };
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let ew = if lon.is_sign_negative() { 'W' } else { 'E' };
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let now = time::now_utc();
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let date = now.strftime("%d%m%y").unwrap();
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let timestamp = now.strftime("%H%M%S").unwrap();
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let message = [
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"GPRMC",
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&timestamp.to_string(),
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"A", // A: valid, V: invalid
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&lat_nmea,
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&ns.to_string(),
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&lon_nmea,
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&ew.to_string(),
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"0", // speed over ground (knots)
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"0", // course over ground (degrees)
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&date.to_string(),
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"", // magnetic variation (degrees)
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"", // E/W (east/west)
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].join(",");
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let checksum = checksum(&message);
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format!("${}*{}", message, checksum)
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}

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