From 88ff1ba7b8d71e1e383ac0b4cbc263c78a639b13 Mon Sep 17 00:00:00 2001
From: Morten Nielsen <mn@iter.dk>
Date: Fri, 28 Aug 2020 16:33:02 -0700
Subject: [PATCH] Improve UWP sample app

---
 src/SampleApp.UWP/MainPage.xaml    |  33 ++++++-
 src/SampleApp.UWP/MainPage.xaml.cs | 137 ++++++++++++++++++++---------
 2 files changed, 124 insertions(+), 46 deletions(-)

diff --git a/src/SampleApp.UWP/MainPage.xaml b/src/SampleApp.UWP/MainPage.xaml
index 809f569..6e8e626 100644
--- a/src/SampleApp.UWP/MainPage.xaml
+++ b/src/SampleApp.UWP/MainPage.xaml
@@ -7,10 +7,35 @@
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
     mc:Ignorable="d">
 
-    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
-		<TextBox x:Name="output"
-				 AcceptsReturn="True"
-				 />
+    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}" Padding="10">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
 
+        <StackPanel x:Name="gnssMonitorView" BorderBrush="Black" BorderThickness="1" Padding="5" CornerRadius="3">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="Latitude: " />
+                <TextBlock Text="{Binding Latitude}" />
+            </StackPanel>
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="Longitude: " />
+                <TextBlock Text="{Binding Longitude}" />
+            </StackPanel>
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="Altitude: " />
+                <TextBlock Text="{Binding Altitude}" />
+            </StackPanel>
+        </StackPanel>
+
+        <ComboBox Header="NMEA Device:" x:Name="nmeaDevicePicker" Grid.Row="1" Margin="0, 10" />
+        <StackPanel Orientation="Horizontal" Grid.Row="2">
+            <Button Content="Start" x:Name="startButton" Click="startButton_Click" />
+            <Button Content="Stop" IsEnabled="False" x:Name="stopButton" Click="stopButton_Click" />
+        </StackPanel>
+
+        <TextBox x:Name="output" Grid.Row="3" AcceptsReturn="True" Header="NMEA Messages" Margin="0, 10" />
 	</Grid>
 </Page>
diff --git a/src/SampleApp.UWP/MainPage.xaml.cs b/src/SampleApp.UWP/MainPage.xaml.cs
index 27a5ae6..d104c65 100644
--- a/src/SampleApp.UWP/MainPage.xaml.cs
+++ b/src/SampleApp.UWP/MainPage.xaml.cs
@@ -1,10 +1,14 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.IO;
 using System.Linq;
 using System.Runtime.InteropServices.WindowsRuntime;
+using System.Threading.Tasks;
+using NmeaParser;
 using Windows.Devices.Bluetooth.Rfcomm;
 using Windows.Devices.Enumeration;
+using Windows.Devices.Perception;
 using Windows.Devices.SerialCommunication;
 using Windows.Foundation;
 using Windows.Foundation.Collections;
@@ -25,39 +29,39 @@ namespace SampleApp.UWP
     /// </summary>
     public sealed partial class MainPage : Page
     {
-        private Queue<string> messages = new Queue<string>(101);
+		public class DeviceInfo
+        {
+			public Func<Task<NmeaDevice>> CreateMethod { get; set; }
+			public string DisplayName { get; set; }
+			public override string ToString() => DisplayName;
+        }
+
+		private Queue<string> messages = new Queue<string>(101);
+		private NmeaParser.NmeaDevice listener;
+		private NmeaParser.Gnss.GnssMonitor monitor;
+		private ObservableCollection<DeviceInfo> deviceList = new ObservableCollection<DeviceInfo>();
 
 		public MainPage()
 		{
 			this.InitializeComponent();
 			//Load a simulated GPS device that plays back an NMEA log file
-			LoadLocalGpsSimulationData();
-			//Use this to connect to a bluetooth device instead:
-			//LoadBluetoothGPS();
-			//Use this to connect to a serial port device instead:
-			//LoadSerialDeviceGPS();
-		}
-
-		private async void LoadSerialDeviceGPS()
-		{
-			var selector = SerialDevice.GetDeviceSelector("COM3");
-			var devices = await DeviceInformation.FindAllAsync(selector);
-			if(devices.Any())
+			nmeaDevicePicker.ItemsSource = deviceList;
+			deviceList.Add(new DeviceInfo()
 			{
-				var deviceInfo = devices.First();
-				var serialDevice = await SerialDevice.FromIdAsync(deviceInfo.Id);
-				//Set up serial device according to device specifications:
-				serialDevice.BaudRate = 4800;
-				serialDevice.DataBits = 8;
-				serialDevice.Parity = SerialParity.None;
-				var device = new NmeaParser.SerialPortDevice(serialDevice);
-				device.MessageReceived += device_MessageReceived;
-				await device.OpenAsync();
-			}
+				DisplayName = "Simulated NMEA Device",
+				CreateMethod = async () =>
+				{
+					var file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///NmeaSampleData.txt"));
+					return new NmeaParser.NmeaFileDevice(file);
+				}
+			});
+			nmeaDevicePicker.SelectedIndex = 0;
+			LoadDevices();
 		}
-
-		private async void LoadBluetoothGPS()
+		
+		private async void LoadDevices()
 		{
+			// Find bluetooth devices
 			//Ensure the bluetooth capability is enabled by opening package.appxmanifest in a text editor, 
 			// and add the following to the <Capabilities> section:
 			//    <m2:DeviceCapability Name="bluetooth.rfcomm">
@@ -67,28 +71,77 @@ namespace SampleApp.UWP
 			//    </m2:DeviceCapability>
 
 			//Get list of devices
-			string serialDeviceType = RfcommDeviceService.GetDeviceSelector(RfcommServiceId.SerialPort);
-			var devices = await DeviceInformation.FindAllAsync(serialDeviceType);
+			var btdevices = await NmeaParser.BluetoothDevice.GetBluetoothSerialDevicesAsync();
+			foreach(var item in btdevices)
+            {
+				deviceList.Add(new DeviceInfo()
+				{
+					DisplayName = $"{item.Device.Name} (Bluetooth)",
+					CreateMethod = () =>
+					{
+						return Task.FromResult<NmeaParser.NmeaDevice>(new NmeaParser.BluetoothDevice(item));
+					}
+				});
+				
+            }
 
-			string GpsDeviceName = "HOLUX GPSlim236"; //Change name to your device or build UI for user to select from list of 'devices'
-													  //Select device by name
-			var bluetoothDevice = devices.Where(t => t.Name == GpsDeviceName).FirstOrDefault();
-			//Get service
-			RfcommDeviceService rfcommService = await RfcommDeviceService.FromIdAsync(bluetoothDevice.Id);
-			if (rfcommService != null)
+			// Find serial devices
+			for (int i = 1; i < 10; i++)
 			{
-				var device = new NmeaParser.BluetoothDevice(rfcommService);
-				device.MessageReceived += device_MessageReceived;
-				await device.OpenAsync();
+				var selector = SerialDevice.GetDeviceSelector("COM" + i.ToString());
+				var devices = await DeviceInformation.FindAllAsync(selector);
+				if (devices.Any())
+				{
+					var deviceInfo = devices.First();
+					var serialDevice = await SerialDevice.FromIdAsync(deviceInfo.Id);
+					if (serialDevice != null)
+					{
+						deviceList.Add(new DeviceInfo()
+						{
+							DisplayName = $"Serial Port {i} (COM{i}) @ 9600 baud",
+							CreateMethod = () =>
+							{
+								//Set up serial device according to device specifications:
+								serialDevice.BaudRate = 9600;
+								serialDevice.DataBits = 8;
+								serialDevice.Parity = SerialParity.None;
+								Task.FromResult<NmeaDevice>(new NmeaParser.SerialPortDevice(serialDevice));
+							}
+						});
+					}
+				}
 			}
 		}
 
-		public async void LoadLocalGpsSimulationData()
+		private async void startButton_Click(object sender, RoutedEventArgs e)
 		{
-			var file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///NmeaSampleData.txt"));
-			var device = new NmeaParser.NmeaFileDevice(file);
-			device.MessageReceived += device_MessageReceived;
-			var _ = device.OpenAsync();
+			var info = nmeaDevicePicker.SelectedItem as DeviceInfo;
+			if (info != null)
+			{
+				var device = await info.CreateMethod();
+				output.Text = string.Empty;
+				messages.Clear();
+				device.MessageReceived += device_MessageReceived;
+				var _ = device.OpenAsync();
+				listener = device;
+				startButton.IsEnabled = false;
+				stopButton.IsEnabled = true;
+				monitor = new NmeaParser.Gnss.GnssMonitor(device);
+				gnssMonitorView.DataContext = monitor;
+			}
+		}
+
+		private void stopButton_Click(object sender, RoutedEventArgs e)
+		{
+			if(listener != null)
+            {
+				gnssMonitorView.DataContext = null;
+				_ = listener.CloseAsync();
+				listener.Dispose();
+				listener = null;
+				startButton.IsEnabled = true;
+				stopButton.IsEnabled = false;
+			}
 		}
 
 		private void device_MessageReceived(object sender, NmeaParser.NmeaMessageReceivedEventArgs args)
@@ -100,5 +153,5 @@ namespace SampleApp.UWP
 				output.Text = string.Join("\n", messages.ToArray());
 			});
 		}
-	}
+    }
 }
\ No newline at end of file