Add Ping command

PlantBox.Broker/Program.cs

@@ -1,4 +1,8 @@
-using System;
+using PlantBox.Shared.Communication;
+using PlantBox.Shared.Communication.Commands;
+using System;
+using System.Net;
+using System.Net.Sockets;
 
 namespace PlantBox.Broker
 {
@@ -7,6 +11,29 @@ namespace PlantBox.Broker
         static void Main(string[] args)
         {
             Console.WriteLine("Hello World!");
+            var listener = new TcpListener(IPAddress.Any, Connection.TCP_PORT);
+            listener.Start();
+
+            while (true)
+            {
+                try
+                {
+                    var client = listener.AcceptTcpClient();
+                    var stream = new CommandStream(client.GetStream());
+
+                    var command = stream.Receive();
+                    Console.WriteLine(command);
+
+                    var ping = new Ping().Deserialize(command.Arguments);
+                    Console.WriteLine($"Ping: {ping.Message}");
+
+                    stream.Send(new Ping(ping.Message).ToCommandPacket(Command.Ping, command.ID));
+                }
+                catch (Exception)
+                {
+
+                }
+            }
         }
     }
 }