Meadow.Foundation.Sensors.Location.Gnss.NmeaProcessor 2.5.0

Meadow.Foundation.Sensors.Location.Gnss.NmeaProcessor

GNSS NMEA parsing library

The NmeaProcessor library is included in the Meadow.Foundation.Sensors.Location.Gnss.NmeaProcessor nuget package and is designed for the Wilderness Labs Meadow .NET IoT platform.

This driver is part of the Meadow.Foundation peripherals library, an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT applications.

For more information on developing for Meadow, visit developer.wildernesslabs.co.

To view all Wilderness Labs open-source projects, including samples, visit github.com/wildernesslabs.

Installation

You can install the library from within Visual studio using the the NuGet Package Manager or from the command line using the .NET CLI:

dotnet add package Meadow.Foundation.Sensors.Location.Gnss.NmeaProcessor

Usage

private List<string> sentences;
private NmeaSentenceProcessor nmeaProcessor;

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    sentences = GetSampleNmeaSentences();

    InitDecoders();

    foreach (string sentence in sentences)
    {
        Resolver.Log.Info($"About to process:{sentence}");
        nmeaProcessor.ProcessNmeaMessage(sentence);
    }

    Resolver.Log.Info("Made it through all sentences");

    return Task.CompletedTask;
}

private void InitDecoders()
{
    Resolver.Log.Info("Create NMEA");
    nmeaProcessor = new NmeaSentenceProcessor();

    Resolver.Log.Info("Add decoders");

    // GGA
    var ggaDecoder = new GgaDecoder();
    Resolver.Log.Info("Created GGA");
    nmeaProcessor.RegisterDecoder(ggaDecoder);
    ggaDecoder.PositionReceived += (object sender, GnssPositionInfo location) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info(location.ToString());
        Resolver.Log.Info("*********************************************");
    };

    // GLL
    var gllDecoder = new GllDecoder();
    nmeaProcessor.RegisterDecoder(gllDecoder);
    gllDecoder.PositionReceived += (object sender, GnssPositionInfo location) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info(location.ToString());
        Resolver.Log.Info("*********************************************");
    };

    // GSA
    var gsaDecoder = new GsaDecoder();
    nmeaProcessor.RegisterDecoder(gsaDecoder);
    gsaDecoder.ActiveSatellitesReceived += (object sender, ActiveSatellites activeSatellites) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info(activeSatellites.ToString());
        Resolver.Log.Info("*********************************************");
    };

    // RMC (recommended minimum)
    var rmcDecoder = new RmcDecoder();
    nmeaProcessor.RegisterDecoder(rmcDecoder);
    rmcDecoder.PositionReceived += (object sender, GnssPositionInfo positionCourseAndTime) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info(positionCourseAndTime.ToString());
        Resolver.Log.Info("*********************************************");

    };

    // VTG (course made good)
    var vtgDecoder = new VtgDecoder();
    nmeaProcessor.RegisterDecoder(vtgDecoder);
    vtgDecoder.CourseAndVelocityReceived += (object sender, CourseOverGround courseAndVelocity) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info($"{courseAndVelocity}");
        Resolver.Log.Info("*********************************************");
    };

    // GSV (satellites in view)
    var gsvDecoder = new GsvDecoder();
    nmeaProcessor.RegisterDecoder(gsvDecoder);
    gsvDecoder.SatellitesInViewReceived += (object sender, SatellitesInView satellites) =>
    {
        Resolver.Log.Info("*********************************************");
        Resolver.Log.Info($"{satellites}");
        Resolver.Log.Info("*********************************************");
    };
}

private List<string> GetSampleNmeaSentences()
{
    List<string> sentences = new List<string>() {
        "$GPGGA,000049.799,,,,,0,00,,,M,,M,,*72", // i think not valid.
        "$GNGGA,001043.00,4404.14036,N,12118.85961,W,1,12,0.98,1113.0,M,-21.3,M,,*47", // valid
        "$GNRMC,001031.00,A,4404.13993,N,12118.86023,W,0.146,,100117,,,A*7B", // valid
        "$GPVTG,220.86,T,,M,2.550,N,4.724,K,A*34", // Valid
        "$GPVTG,0.00,T,,M,0.00,N,0.00,K,N*32",
        "$GPRMC,162254.00,A,3723.02837,N,12159.39853,W,0.820,188.36,110706,,,A*74",
        "$GPVTG,188.36,T,,M,0.820,N,1.519,K,A*3F",
        "$GPGGA,162254.00,3723.02837,N,12159.39853,W,1,03,2.36,525.6,M,-25.6,M,,*65",
        "$GPGSA,A,2,25,01,22,,,,,,,,,,2.56,2.36,1.00*02",

        "$GPGSA,A,3,10,32,14,01,,,,,,,,,2.41,2.20,0.99*01",

        "$GPGSV,3,1,11,03,03,111,00,04,15,270,00,06,01,010,00,13,06,292,00*74",
        "$GPGSV,3,2,11,14,25,170,00,16,57,208,39,18,67,296,40,19,40,246,00*74",
        "$GPGSV,3,3,11,22,42,067,42,24,14,311,43,27,05,244,00,,,,*4D",

        "$GPGLL,3723.02837,N,12159.39853,W,162254.00,A,A*7C",
        "$GPZDA,162254.00,11,07,2006,00,00*63",
        "$GNGLL,,,,,,V,N*7A",
        "$GLGSV,1,1,00*65",
    };

    return sentences;
}

How to Contribute

• Found a bug? Report an issue
• Have a feature idea or driver request? Open a new feature request
• Want to contribute code? Fork the Meadow.Foundation repository and submit a pull request against the develop branch

Need Help?

If you have questions or need assistance, please join the Wilderness Labs community on Slack.

About Meadow

Meadow is a complete, IoT platform with defense-grade security that runs full .NET applications on embeddable microcontrollers and Linux single-board computers including Raspberry Pi and NVIDIA Jetson.

Build

Use the full .NET platform and tooling such as Visual Studio and plug-and-play hardware drivers to painlessly build IoT solutions.

Connect

Utilize native support for WiFi, Ethernet, and Cellular connectivity to send sensor data to the Cloud and remotely control your peripherals.

Deploy

Instantly deploy and manage your fleet in the cloud for OtA, health-monitoring, logs, command + control, and enterprise backend integrations.