Initial commit

Conversion of the UWP app into a .NET Core app for portability. Requires .NET Core 2.0 and C# 7.1

FindUnits.cs

@@ -0,0 +1,50 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Sockets;
+using System.Threading.Tasks;
+
+namespace ScreenLogicConnect
+{
+    public class FindUnits
+    {
+        protected const short multicastPort = 1444;
+        private Socket searchSocket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
+
+        public static async Task<IEnumerable<EasyTouchUnit>> Find()
+        {
+            List<EasyTouchUnit> units = new List<EasyTouchUnit>();
+
+            using (var udpClient = new UdpClient(new IPEndPoint(GetMyIP(), 53112))
+            {
+                EnableBroadcast = true,
+                MulticastLoopback = false,
+            })
+            {
+                await udpClient.SendAsync((byte[])(Array)FindUnitBroadcast.data, FindUnitBroadcast.data.Length, new IPEndPoint(IPAddress.Broadcast, multicastPort));
+
+                var buf = await udpClient.ReceiveAsync();
+                var findServerResponse = new EasyTouchUnit(buf);
+                if (findServerResponse.isValid)
+                {
+                    units.Add(findServerResponse);
+                }
+            }
+
+            return units;
+        }
+
+        public static IPAddress GetMyIP()
+        {
+            IPAddress localIP;
+            using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, 0))
+            {
+                socket.Connect("8.8.8.8", 65530);
+                IPEndPoint endPoint = socket.LocalEndPoint as IPEndPoint;
+                localIP = endPoint.Address;
+            }
+
+            return localIP;
+        }
+    }
+}