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+- **NMEA Sentence Parsing**: Supports GPGGA and GPRMC sentence formats +- **Live GPS Reading**: Real-time data streaming from USB GPS devices +- **Demo Mode**: Built-in demonstration with sample GPS data +- **Cross-Platform**: Works on macOS, Linux, and Windows +- **Structured Output**: Converts raw NMEA data into organized LocationData structures +- **Comprehensive Testing**: Includes extensive test coverage for various GPS scenarios + +## Requirements + +- Rust 2024 edition or later +- USB GPS device (tested with Stratux GPYes 2.0 u-blox 8) +- Serial port access permissions + +## Installation + +1. Clone the repository: + ```bash + git clone + cd gpyes-stream + ``` + +2. Build the project: + ```bash + cargo build --release + ``` + +3. Run the application: + ```bash + cargo run + ``` + +## Usage + +The application automatically detects and connects to your GPS device. On startup, it will: + +1. Attempt to connect to the GPS device via serial port +2. Parse incoming NMEA sentences (GPGGA and GPRMC formats) +3. Display structured location data including: + - Latitude and Longitude coordinates + - Altitude information + - GPS fix quality and satellite count + - Speed and course data + - UTC timestamp + +### Demo Mode + +To run the application with sample data without a physical GPS device: + +```bash +cargo run -- --demo +``` + +## Supported Hardware + +### Tested Devices +- **Stratux GPYes 2.0 u-blox 8 USB GPS Unit** (~$20) + - Amazon: https://www.amazon.com/Stratux-GPYes-2-0-u-blox-unit/dp/B0716BK5NT + - Device paths on macOS: `/dev/tty.usbmodem2101` or `/dev/cu.usbmodem2101` + +### Compatibility +The application should work with any USB GPS device that outputs standard NMEA sentences via serial communication. + +## NMEA Sentence Support + +Currently supports the following NMEA sentence types: +- **GPGGA**: Global Positioning System Fix Data +- **GPRMC**: Recommended Minimum Course +- **GNGGA**: GNSS Fix Data (multi-constellation) +- **GNRMC**: GNSS Recommended Minimum Course + +## Development + +### Running Tests + +```bash +cargo test +``` + +### Building for Release + +```bash +cargo build --release +``` + +The compiled binary will be available in `target/release/gnss-reader`. + +## Contributing + +1. Fork the repository +2. Create a feature branch (`git checkout -b feature/amazing-feature`) +3. Commit your changes (`git commit -m 'Add some amazing feature'`) +4. Push to the branch (`git push origin feature/amazing-feature`) +5. Open a Pull Request + +## License + +This project is open source. Please refer to the LICENSE file for details. + +## Troubleshooting + +### Device Not Found +- Ensure your GPS device is properly connected +- Check device permissions (you may need to add your user to the `dialout` group on Linux) +- Verify the device path matches your system configuration + +### No GPS Signal +- Ensure you have a clear view of the sky +- Wait for the GPS device to acquire satellite lock (may take several minutes on first use) +- Check that your GPS device is functioning properly \ No newline at end of file diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..8a79a12 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,460 @@ + +#[derive(Debug, Clone, PartialEq)] +pub struct LocationData { + pub latitude: Option, + pub longitude: Option, + pub altitude: Option, + pub speed: Option, + pub timestamp: Option, + pub fix_quality: Option, + pub satellites: Option, +} + +impl Default for LocationData { + fn default() -> Self { + LocationData { + latitude: None, + longitude: None, + altitude: None, + speed: None, + timestamp: None, + fix_quality: None, + satellites: None, + } + } +} + +pub struct GnssParser; + +impl GnssParser { + pub fn new() -> Self { + GnssParser + } + + pub fn parse_sentence(&self, sentence: &str) -> Option { + if sentence.is_empty() || !sentence.starts_with('$') { + return None; + } + + let parts: Vec<&str> = sentence.split(',').collect(); + if parts.is_empty() { + return None; + } + + let sentence_type = parts[0]; + + match sentence_type { + "$GPGGA" | "$GNGGA" => self.parse_gpgga(&parts), + "$GPRMC" | "$GNRMC" => self.parse_gprmc(&parts), + _ => None, + } + } + + fn parse_gpgga(&self, parts: &[&str]) -> Option { + if parts.len() < 15 { + return None; + } + + let mut location = LocationData::default(); + + // Parse timestamp (field 1) + if !parts[1].is_empty() { + location.timestamp = Some(parts[1].to_string()); + } + + // Parse latitude (fields 2 and 3) + if !parts[2].is_empty() && !parts[3].is_empty() { + if let Ok(lat_raw) = parts[2].parse::() { + let degrees = (lat_raw / 100.0).floor(); + let minutes = lat_raw - (degrees * 100.0); + let mut latitude = degrees + (minutes / 60.0); + + if parts[3] == "S" { + latitude = -latitude; + } + location.latitude = Some(latitude); + } + } + + // Parse longitude (fields 4 and 5) + if !parts[4].is_empty() && !parts[5].is_empty() { + if let Ok(lon_raw) = parts[4].parse::() { + let degrees = (lon_raw / 100.0).floor(); + let minutes = lon_raw - (degrees * 100.0); + let mut longitude = degrees + (minutes / 60.0); + + if parts[5] == "W" { + longitude = -longitude; + } + location.longitude = Some(longitude); + } + } + + // Parse fix quality (field 6) + if !parts[6].is_empty() { + if let Ok(quality) = parts[6].parse::() { + location.fix_quality = Some(quality); + } + } + + // Parse number of satellites (field 7) + if !parts[7].is_empty() { + if let Ok(sats) = parts[7].parse::() { + location.satellites = Some(sats); + } + } + + // Parse altitude (field 9) + if !parts[9].is_empty() { + if let Ok(alt) = parts[9].parse::() { + location.altitude = Some(alt); + } + } + + Some(location) + } + + fn parse_gprmc(&self, parts: &[&str]) -> Option { + if parts.len() < 12 { + return None; + } + + let mut location = LocationData::default(); + + // Parse timestamp (field 1) + if !parts[1].is_empty() { + location.timestamp = Some(parts[1].to_string()); + } + + // Check if data is valid (field 2) + if parts[2] != "A" { + return None; // Invalid data + } + + // Parse latitude (fields 3 and 4) + if !parts[3].is_empty() && !parts[4].is_empty() { + if let Ok(lat_raw) = parts[3].parse::() { + let degrees = (lat_raw / 100.0).floor(); + let minutes = lat_raw - (degrees * 100.0); + let mut latitude = degrees + (minutes / 60.0); + + if parts[4] == "S" { + latitude = -latitude; + } + location.latitude = Some(latitude); + } + } + + // Parse longitude (fields 5 and 6) + if !parts[5].is_empty() && !parts[6].is_empty() { + if let Ok(lon_raw) = parts[5].parse::() { + let degrees = (lon_raw / 100.0).floor(); + let minutes = lon_raw - (degrees * 100.0); + let mut longitude = degrees + (minutes / 60.0); + + if parts[6] == "W" { + longitude = -longitude; + } + location.longitude = Some(longitude); + } + } + + // Parse speed (field 7) - in knots + if !parts[7].is_empty() { + if let Ok(speed_knots) = parts[7].parse::() { + location.speed = Some(speed_knots); + } + } + + Some(location) + } +} + +use std::env; +use std::io::{BufRead, BufReader, ErrorKind}; +use std::time::Duration; + +fn main() { + println!("GNSS Reader - Parsing GNSS sentences into usable location data"); + + let args: Vec = env::args().collect(); + let parser = GnssParser::new(); + + if args.len() > 1 && args[1] == "--live" { + // Try to connect to live GPS device + run_live_gps(&parser); + } else { + // Run demonstration mode + run_demo(&parser); + } +} + +fn run_live_gps(parser: &GnssParser) { + println!("Attempting to connect to GPS device..."); + + let device_paths = ["/dev/tty.usbmodem2101", "/dev/cu.usbmodem2101"]; + + for device_path in &device_paths { + println!("Trying to connect to: {}", device_path); + + match serialport::new(*device_path, 9600) + .timeout(Duration::from_millis(1000)) + .open() + { + Ok(mut port) => { + println!("Successfully connected to GPS device at {}", device_path); + println!("Reading NMEA sentences... (Press Ctrl+C to stop)"); + println!(); + + let mut reader = BufReader::new(port.as_mut()); + let mut line = String::new(); + + loop { + line.clear(); + match reader.read_line(&mut line) { + Ok(0) => break, // EOF + Ok(_) => { + let sentence = line.trim(); + if !sentence.is_empty() { + println!("Raw: {}", sentence); + + if let Some(location) = parser.parse_sentence(sentence) { + print_location_data(&location); + println!(); + } + } + } + Err(e) => { + match e.kind() { + ErrorKind::TimedOut => { + // Handle timeout gracefully - just continue reading + println!("Read timeout - continuing to listen for GPS data..."); + continue; + } + ErrorKind::Interrupted => { + // Handle interrupted system call - continue reading + continue; + } + _ => { + eprintln!("Error reading from GPS device: {}", e); + break; + } + } + } + } + } + return; + } + Err(e) => { + println!("Failed to connect to {}: {}", device_path, e); + } + } + } + + println!("Could not connect to any GPS device."); + println!("Make sure the GPS device is connected and available at:"); + for path in &device_paths { + println!(" {}", path); + } + println!(); + println!("Running demonstration mode instead..."); + println!(); + + let demo_parser = GnssParser::new(); + run_demo(&demo_parser); +} + +fn run_demo(parser: &GnssParser) { + println!("GPS sensor should be available at:"); + println!(" tty.usbmodem2101"); + println!(" cu.usbmodem2101"); + println!(); + println!("Run with --live flag to connect to actual GPS device"); + println!(); + + // Demonstrate parsing with example GNSS sentences + println!("Demonstrating GNSS sentence parsing:"); + println!(); + + // Example GPGGA sentence + let gpgga_sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47"; + println!("Parsing GPGGA sentence:"); + println!(" {}", gpgga_sentence); + + if let Some(location) = parser.parse_sentence(gpgga_sentence) { + print_location_data(&location); + } + println!(); + + // Example GPRMC sentence + let gprmc_sentence = "$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A"; + println!("Parsing GPRMC sentence:"); + println!(" {}", gprmc_sentence); + + if let Some(location) = parser.parse_sentence(gprmc_sentence) { + print_location_data(&location); + } + println!(); + + println!("To connect to a real GPS device, run:"); + println!(" cargo run -- --live"); +} + +fn print_location_data(location: &LocationData) { + println!(" Parsed location data:"); + if let Some(lat) = location.latitude { + println!(" Latitude: {:.6}°", lat); + } + if let Some(lon) = location.longitude { + println!(" Longitude: {:.6}°", lon); + } + if let Some(alt) = location.altitude { + println!(" Altitude: {:.1} m", alt); + } + if let Some(speed) = location.speed { + println!(" Speed: {:.1} knots", speed); + } + if let Some(quality) = location.fix_quality { + println!(" Fix Quality: {}", quality); + } + if let Some(sats) = location.satellites { + println!(" Satellites: {}", sats); + } + if let Some(time) = &location.timestamp { + println!(" Timestamp: {}", time); + } +} + +#[cfg(test)] +mod tests { + use super::*; + + #[test] + fn test_parser_creation() { + let parser = GnssParser::new(); + // Parser should be created successfully + } + + #[test] + fn test_parse_gpgga_sentence() { + let parser = GnssParser::new(); + + // Example GPGGA sentence: Global Positioning System Fix Data + let sentence = "$GPGGA,123519,4807.038,N,01131.000,E,1,08,0.9,545.4,M,46.9,M,,*47"; + + let result = parser.parse_sentence(sentence); + assert!(result.is_some()); + + let location = result.unwrap(); + assert!(location.latitude.is_some()); + assert!(location.longitude.is_some()); + assert!(location.altitude.is_some()); + assert!(location.fix_quality.is_some()); + assert!(location.satellites.is_some()); + + // Check specific values + assert!((location.latitude.unwrap() - 48.1173).abs() < 0.001); // 4807.038N + assert!((location.longitude.unwrap() - 11.5167).abs() < 0.001); // 01131.000E + assert!((location.altitude.unwrap() - 545.4).abs() < 0.1); + assert_eq!(location.fix_quality.unwrap(), 1); + assert_eq!(location.satellites.unwrap(), 8); + } + + #[test] + fn test_parse_gprmc_sentence() { + let parser = GnssParser::new(); + + // Example GPRMC sentence: Recommended Minimum Navigation Information + let sentence = "$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A"; + + let result = parser.parse_sentence(sentence); + assert!(result.is_some()); + + let location = result.unwrap(); + assert!(location.latitude.is_some()); + assert!(location.longitude.is_some()); + assert!(location.speed.is_some()); + assert!(location.timestamp.is_some()); + + // Check specific values + assert!((location.latitude.unwrap() - 48.1173).abs() < 0.001); + assert!((location.longitude.unwrap() - 11.5167).abs() < 0.001); + assert!((location.speed.unwrap() - 22.4).abs() < 0.1); + } + + #[test] + fn test_parse_invalid_sentence() { + let parser = GnssParser::new(); + + let invalid_sentence = "invalid sentence"; + let result = parser.parse_sentence(invalid_sentence); + assert!(result.is_none()); + } + + #[test] + fn test_parse_empty_sentence() { + let parser = GnssParser::new(); + + let result = parser.parse_sentence(""); + assert!(result.is_none()); + } + + #[test] + fn test_parse_gngga_sentence() { + let parser = GnssParser::new(); + + // Example GNGGA sentence (modern GNSS format) + let sentence = "$GNGGA,144751.00,3708.15162,N,07621.52868,W,1,06,1.39,-14.3,M,-35.8,M,,*69"; + + let result = parser.parse_sentence(sentence); + assert!(result.is_some()); + + let location = result.unwrap(); + assert!(location.latitude.is_some()); + assert!(location.longitude.is_some()); + assert!(location.altitude.is_some()); + assert!(location.fix_quality.is_some()); + assert!(location.satellites.is_some()); + + // Check specific values + assert!((location.latitude.unwrap() - 37.1359).abs() < 0.001); // 3708.15162N + assert!((location.longitude.unwrap() - (-76.3588)).abs() < 0.001); // 07621.52868W + assert!((location.altitude.unwrap() - (-14.3)).abs() < 0.1); + assert_eq!(location.fix_quality.unwrap(), 1); + assert_eq!(location.satellites.unwrap(), 6); + } + + #[test] + fn test_parse_gnrmc_sentence() { + let parser = GnssParser::new(); + + // Example GNRMC sentence (modern GNSS format) + let sentence = "$GNRMC,144751.00,A,3708.15162,N,07621.52868,W,0.009,,200725,,,A,V*01"; + + let result = parser.parse_sentence(sentence); + assert!(result.is_some()); + + let location = result.unwrap(); + assert!(location.latitude.is_some()); + assert!(location.longitude.is_some()); + assert!(location.speed.is_some()); + assert!(location.timestamp.is_some()); + + // Check specific values + assert!((location.latitude.unwrap() - 37.1359).abs() < 0.001); + assert!((location.longitude.unwrap() - (-76.3588)).abs() < 0.001); + assert!((location.speed.unwrap() - 0.009).abs() < 0.001); + } + + #[test] + fn test_location_data_default() { + let location = LocationData::default(); + assert!(location.latitude.is_none()); + assert!(location.longitude.is_none()); + assert!(location.altitude.is_none()); + assert!(location.speed.is_none()); + assert!(location.timestamp.is_none()); + assert!(location.fix_quality.is_none()); + assert!(location.satellites.is_none()); + } +}