Added NightAlert project for travel kit

NightScout/Alerters/Alerter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NightScout
+{
+    public abstract class Alerter : IAlerter
+    {
+        public abstract void StartAlert();
+        public abstract void StartStaleDataAlert();
+        public abstract void StartUrgentAlert();
+        public abstract void StopAlerts();
+    }
+}

NightScout/Alerters/ConsoleAlerter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NightScout
+{
+    public class ConsoleAlerter : IAlerter
+    {
+
+        public void StartAlert()
+        {
+            Console.WriteLine("Alerting");
+        }
+
+        public void StartUrgentAlert()
+        {
+            Console.WriteLine("Urgent Alerting");
+        }
+
+        public void StartStaleDataAlert()
+        {
+            Console.WriteLine("Stale Data Alerting");
+        }
+
+        public void StopAlerts()
+        {
+            Console.WriteLine("Alerts stopped");
+        }
+    }
+}

NightScout/Alerters/MultiAlerter.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace NightScout
+{
+    public class MultiAlerter : IAlerter
+    {
+        public List<IAlerter> Alerters { get; set; }
+
+        public MultiAlerter(IEnumerable<IAlerter> alerters)
+        {
+            Alerters = new List<IAlerter>(alerters);
+        }
+        public void StartAlert()
+        {
+            Alerters.ForEach(a =>
+            {
+                try
+                {
+                    a.StartAlert();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex);
+                }
+            });
+
+        }
+
+        public void StartUrgentAlert()
+        {
+            Alerters.ForEach(a =>
+            {
+                try
+                {
+                    a.StartUrgentAlert();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex);
+                }
+            });
+        }
+
+        public void StartStaleDataAlert()
+        {
+            Alerters.ForEach(a =>
+            {
+                try
+                {
+                    a.StartStaleDataAlert();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex);
+                }
+            });
+        }
+
+        public void StopAlerts()
+        {
+
+            Alerters.ForEach(a =>
+            {
+                try
+                {
+                    a.StopAlerts();
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex);
+                } 
+            });
+
+        }
+    }
+}

NightScout/Alerters/RaspberryPiAudioAlert.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using NightScout.Interfaces;
+
+namespace NightScout
+{
+    public class RaspberryPiAudioAlert : IAlerter
+    {
+        public String PlayerCommandLine { get; set; }
+        public String KillCommand { get; set; }
+        public String AlertFileName { get; set; }
+
+        protected IRaspberryPiButtonSource ButtonSource;
+
+        private Boolean playing = false;
+
+
+        public RaspberryPiAudioAlert()
+        {
+            this.PlayerCommandLine = "\"mpg123 -q {0}\"";
+            this.KillCommand = "pkill mpg123";
+            this.AlertFileName = "~/ratm.mp3";
+        }
+
+        public RaspberryPiAudioAlert(String playerCommandline)
+            : base()
+        {
+            this.PlayerCommandLine = playerCommandline;
+        }
+
+        public RaspberryPiAudioAlert(String playerCommandline, IRaspberryPiButtonSource buttonSource)
+            : this(playerCommandline)
+        {
+            this.ButtonSource = buttonSource;
+            this.ButtonSource.ButtonStateChange += ButtonSource_ButtonStateChange;
+        }
+
+        public RaspberryPiAudioAlert(IRaspberryPiButtonSource buttonSource)
+            : this()
+        {
+            this.ButtonSource = buttonSource;
+            this.ButtonSource.ButtonStateChange += ButtonSource_ButtonStateChange;
+        }
+
+        private void ButtonSource_ButtonStateChange(bool obj)
+        {
+            Console.WriteLine("Button state change: {0}", obj);
+            if(obj)
+                StopAlerts();
+        }
+
+        public void StartAlert()
+        {
+            if (!playing)
+            {
+                playing = true;
+                Process.Start("/bin/bash", String.Format("-c {0}", String.Format(PlayerCommandLine,AlertFileName )));
+            }
+        }
+
+        public void StartUrgentAlert()
+        {
+            StartAlert();
+        }
+
+        public void StartStaleDataAlert()
+        {
+            StartAlert();
+        }
+
+        public void StopAlerts()
+        {
+            Process.Start("/bin/bash", "-c \"pkill mpg123\"");
+            playing = false;
+        }
+    }
+}