record device name and position when position data arrives

Source/Meadow.Clima/Controllers/CloudController.cs

@@ -29,6 +29,28 @@ public void LogAppStartup(string hardwareRevision)
         SendEvent(CloudEventIds.DeviceStarted, $"Device started (hardware {hardwareRevision})");
     }
 
+    public void LogDeviceInfo(string deviceName, double latitiude, double longitude)
+    {
+        // {
+        //      "description": "Clima Boot Telemetry",
+        //      "eventId": 109,
+        //      "timestamp": "2024-05-20T22:25:15.862Z",
+        //      "measurements": {
+        //          "lat": 34.2277472,
+        //          "long": -118.2273136
+        //      }
+        // }
+        var cloudEvent = new CloudEvent
+        {
+            Description = "Clima Position Telemetry",
+            Timestamp = DateTime.UtcNow,
+            EventId = 109,
+        };
+
+        cloudEvent.Measurements.Add("device_name", deviceName);
+        cloudEvent.Measurements.Add("lat", latitiude);
+        cloudEvent.Measurements.Add("long", longitude);
+    }
     public void LogWarning(string message)
     {
         SendLog(message, "warning");

Source/Meadow.Clima/Controllers/LocationController.cs

@@ -1,60 +1,39 @@
 using Meadow;
 using Meadow.Devices;
 using Meadow.Peripherals.Sensors.Location.Gnss;
+using System;
 
 namespace Clima_Demo;
 
 public class LocationController
 {
+    private IGnssSensor gnss;
+
     public bool LogData { get; set; } = false;
 
+    public event EventHandler<GnssPositionInfo> PositionReceived;
+
     public LocationController(IClimaHardware clima)
     {
         if (clima.Gnss is { } gnss)
         {
-            //gnss.GsaReceived += GnssGsaReceived;
-            //gnss.GsvReceived += GnssGsvReceived;
-            //gnss.VtgReceived += GnssVtgReceived;
-            gnss.RmcReceived += GnssRmcReceived;
-            gnss.GllReceived += GnssGllReceived;
-            gnss.StartUpdating();
-        }
-
-    }
-    private void GnssGsaReceived(object _, ActiveSatellites e)
-    {
-        if (e.SatellitesUsedForFix is { } sats)
-        {
-            Resolver.Log.Info($"Number of active satellites: {sats.Length}");
-        }
-    }
-
-    private void GnssGsvReceived(object _, SatellitesInView e)
-    {
-        Resolver.Log.Info($"Satellites in view: {e.Satellites.Length}");
-    }
-
-    private void GnssVtgReceived(object _, CourseOverGround e)
-    {
-        if (e is { } cv)
-        {
-            Resolver.Log.Info($"{cv}");
-        };
-    }
-
-    private void GnssRmcReceived(object _, GnssPositionInfo e)
-    {
-        if (e.Valid)
-        {
-            Resolver.Log.InfoIf(LogData, $"GNSS Position: lat: [{e.Position.Latitude}], long: [{e.Position.Longitude}]");
+            this.gnss = gnss;
+            this.gnss.GnssDataReceived += OnGnssDataReceived;
+            this.gnss.StartUpdating();
         }
     }
 
-    private void GnssGllReceived(object _, GnssPositionInfo e)
+    private void OnGnssDataReceived(object sender, IGnssResult e)
     {
-        if (e.Valid)
+        if (e is GnssPositionInfo pi)
         {
-            Resolver.Log.InfoIf(LogData, $"GNSS Position: lat: [{e.Position.Latitude}], long: [{e.Position.Longitude}]");
+            if (pi.IsValid && pi.Position != null)
+            {
+                // we only need one position fix - weather stations don't move
+                Resolver.Log.InfoIf(LogData, $"GNSS Position: lat: [{pi.Position.Latitude}], long: [{pi.Position.Longitude}]");
+                PositionReceived?.Invoke(this, pi);
+                gnss.StopUpdating();
+            }
         }
     }
 }

Source/Meadow.Clima/MainController.cs

@@ -38,7 +38,6 @@ public Task Initialize(IClimaHardware hardware, INetworkAdapter? networkAdapter)
 
         cloudController = new CloudController();
 
-        Resolver.Services.Get<CloudController>()?.LogAppStartup(hardware.RevisionString);
         Resolver.Log.Info($"Running on Clima Hardware {hardware.RevisionString}");
 
         sensorController = new SensorController(hardware);
@@ -49,6 +48,8 @@ public Task Initialize(IClimaHardware hardware, INetworkAdapter? networkAdapter)
 
         locationController = new LocationController(hardware);
 
+        locationController.PositionReceived += OnPositionReceived;
+
         if (networkAdapter == null)
         {
             Resolver.Log.Error("No network adapter found!");
@@ -89,6 +90,18 @@ public Task Initialize(IClimaHardware hardware, INetworkAdapter? networkAdapter)
         return Task.CompletedTask;
     }
 
+    private void OnPositionReceived(object sender, Peripherals.Sensors.Location.Gnss.GnssPositionInfo e)
+    {
+        if (e.Position != null)
+        {
+            // crop to 2 decimal places (~1km accuracy) for privacy
+            var lat = Math.Round(e.Position.Latitude, 2);
+            var lon = Math.Round(e.Position.Longitude, 2);
+
+            cloudController.LogDeviceInfo(Resolver.Device.Information.DeviceName, lat, lon);
+        }
+    }
+
     private void PlatformOS_AfterWake(object sender, WakeSource e)
     {
         Resolver.Log.Info("PlatformOS_AfterWake");