Add csharp JSON deserializer example

https://github.com/Hamlib/Hamlib/issues/695

bindings/csharp/multicast/README.txt

@@ -0,0 +1,22 @@
+Works on Windows and Linux
+
+Requires you get dotnet installed of course
+
+For Wiundows install Visual Studio or such to get dotnet
+
+On Ubuntu 20.04 it was this
+apt install snap
+apt install mono-complete
+snap install dotnet-sdk --classic --channel=5.0
+snap alias dotnet-sdk.dotnet dotnet
+snap install dotnet-runtime-50 --classic
+snap alias dotnet-runtime-50.dotnet dotnet
+export DOTNET_ROOT=/snap/dotnet-sdk/current
+
+Once dotnet is OK
+
+dotnet build
+
+You should then be able to run
+
+./bin/Debug/net5.0/multicast

bindings/csharp/multicast/multicast.cs

@@ -0,0 +1,68 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using Newtonsoft.Json.Serialization;
+using System;
+using System.Collections.Generic;
+using System.IO;
+
+namespace HamlibMultiCast
+{
+    public class HamlibMulticastClient
+    {
+        public class VFO
+        {
+            public string Name;
+            public ulong Freq;
+            public string Mode;
+            public int Width;
+            public bool RX;
+            public bool TX;
+        }
+        public class SpectrumClass
+        {
+            public int Length;
+            public string Data;
+            public string Type;
+            public int MinLevel;
+            public int MaxLevel;
+            public int MinStrength;
+            public int MaxStrength;
+            public double CenterFreq;
+            public int Span;
+            public double LowFreq;
+            public double HighFreq;
+        }
+        public string ID;
+        public List<VFO> VFOs { get; set; }
+        public bool Split;
+        public bool SatMode;
+        public string Rig;
+        public string App;
+        public string Version;
+        public UInt32 Seq;
+        public string CRC;
+        public SpectrumClass Spectrum { get; set; }
+    }
+    class Program
+    {
+        static int Main(string[] args)
+        {
+            Console.WriteLine("HamlibMultiCast Test Json Deserialize");
+            ITraceWriter traceWriter = new MemoryTraceWriter();
+            try
+            {
+
+                string json = File.ReadAllText("test.json");
+                var client = JsonConvert.DeserializeObject<HamlibMulticastClient>(json, new JsonSerializerSettings { TraceWriter = traceWriter, Converters = { new JavaScriptDateTimeConverter() } });
+                 Console.WriteLine(traceWriter);
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(ex.Message);
+                return 1;
+            }
+            return 0;
+        }
+    }
+}
+

bindings/csharp/multicast/multicast.csproj

@@ -0,0 +1,12 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net5.0</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
+</Project>

bindings/csharp/multicast/test.json

@@ -0,0 +1,52 @@
+{
+  "__comment1__": "customizable rig identification -- will allow multiple rigs to be on the multicast",
+  "ID": "Rig#1", 
+  "VFOs": [
+  {
+    "Name": "VFOA",
+    "Freq": 14074000, 
+    "Mode": "USB",
+    "Width": 5000, 
+    "RX": true, 
+    "TX": false
+  },
+  {
+    "Name": "VFOB",
+    "Freq": 14076000,
+    "Mode": "USB",
+    "Width": 5000,
+    "RX": false,
+    "TX": false
+  }],
+
+  "__comment_spectrum__": "Rigs that have spectrum output may include this data",
+  "Spectrum": {
+    "Length": 475,
+    "__comment_spectrum_data__": "2-char hex bytes so data len=2*Length",
+    "Data": "00AAFF75BD2AAA...",
+    "Type": "FIXED|CENTER",
+    "MinLevel": 0,
+    "MaxLevel": 140,
+    "MinStrength": -100,
+    "MaxStrength": 0,
+
+    "__comment_spectrum_center__": "If Type=CENTER, the following fields will be present:",
+    "CenterFreq": 14267000,
+    "Span": 25000,
+
+    "__comment_spectrum_fixed__": "If SpectrumType=FIXED, the following fields will be present:",
+    "LowFreq": 14000000,
+    "HighFreq": 14250000
+  },
+
+  "Split": true,
+  "SatMode": false,
+  "Rig": "Dummy",
+  "App": "Hamlib",
+  "__comment_version__": "protocol version date YYYYMMDD",
+  "Version": "20210520", 
+  "__comment_seq__": "Seq is 1-up sequence number 32-bit -- wraps around to 1 from 2^32-1",
+  "Seq": 1,  
+  "__comment_crc__": "32-bit CRC of entire JSON record replacing the CRC value with 0x00000000",
+  "CRC": "0x00000000"
+}