Configuration now uses JSON. Fixed command line parsing

Program.cs

@@ -1,11 +1,11 @@
-using IniParser;
-using NLog;
+using NLog;
 using System.Collections.Generic;
 using System.CommandLine;
 using System.CommandLine.Invocation;
 using System.Globalization;
 using System.IO;
 using System.Reflection;
+using System.Text.Json;
 using System.Threading;
 
 namespace Barsik
@@ -30,7 +30,7 @@ namespace Barsik
             rootCommand.InvokeAsync(args).Wait();
         }
 
-        static void RunService(string configPath)
+        static void RunService(string config)
 		{
             Logging.Setup();
             logger.Info("Barsik monitoring service starting");
@@ -39,18 +39,20 @@ namespace Barsik
             var server = new ModbusServer(registers);
             units = new List<BaseMonitoringUnit>();
 
-            var configParser = new FileIniDataParser();
-            if (string.IsNullOrEmpty(configPath))
+            if (string.IsNullOrEmpty(config))
             {
                 string assemblyFolder = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
-                configPath = Path.Combine(assemblyFolder, "barsik.ini");
+                config = Path.Combine(assemblyFolder, "barsik.json");
             }
-            var data = configParser.ReadFile(configPath);
-            foreach (var section in data.Sections)
+            string configStr = File.ReadAllText(config);
+            int port = 0;
+            using (JsonDocument doc = JsonDocument.Parse(configStr))
             {
-                if (section.SectionName.StartsWith("Unit"))
+                var root = doc.RootElement;
+                port = root.GetProperty("Port").GetInt32();
+                foreach (var unitElement in root.GetProperty("Units").EnumerateArray())
                 {
-                    var unit = BaseMonitoringUnit.Create(section, registers);
+                    var unit = BaseMonitoringUnit.Create(unitElement, registers);
                     if (unit != null)
                     {
                         units.Add(unit);
@@ -60,7 +62,7 @@ namespace Barsik
                 }
             }
             logger.Info("Configuration loaded, we have " + units.Count + " units");
-            server.Port = int.Parse(data["Server"]["Port"]);
+            server.Port = port;
             server.Run();
             logger.Info("Exiting");
         }