Add sample code for decoding string and binary payloads (#66)

* Add sample for decoding binary payload

- Add ByteArrayToString method
- Add example decoders for string and binary payloads
- Remove unnecessary using statements

* Update LoraDecoders.cs

- Move both examples to one sample decoder: DecoderValueSensor

Samples/DecoderSample/Classes/ConversionHelper.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Text;
+
+namespace SensorDecoderModule.Classes
+{
+    public  static class ConversionHelper
+    {
+        /// <summary>
+        /// Method enabling to convert a hex string to a byte array.
+        /// </summary>
+        /// <param name="hex">Input hex string</param>
+        /// <returns></returns>
+        public static byte[] StringToByteArray(string hex)
+        {
+            int NumberChars = hex.Length;
+            byte[] bytes = new byte[NumberChars / 2];
+            for (int i = 0; i < NumberChars; i += 2)
+                bytes[i / 2] = Convert.ToByte(hex.Substring(i, 2), 16);
+            return bytes;
+        }
+
+        public static string ByteArrayToString(byte[] bytes)
+        {
+            StringBuilder Result = new StringBuilder(bytes.Length * 2);
+            string HexAlphabet = "0123456789ABCDEF";
+
+            foreach (byte B in bytes)
+            {
+                Result.Append(HexAlphabet[(int)(B >> 4)]);
+                Result.Append(HexAlphabet[(int)(B & 0xF)]);
+            }
+
+            return Result.ToString();
+        }
+    }
+}

Samples/DecoderSample/Classes/LoraDecoders.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
+using System.Text;
 using Newtonsoft.Json;
 
 namespace SensorDecoderModule.Classes
@@ -12,8 +7,16 @@ internal static class LoraDecoders
     {   
         private static string DecoderValueSensor(byte[] payload, uint fport)
         {
-            var result = Encoding.UTF8.GetString(payload);            
+            // EITHER: Convert a payload containing a string back to string format for further processing
+            var result = Encoding.UTF8.GetString(payload);
+
+            // OR: Convert a payload containing binary data to HEX string for further processing
+            var result_binary = ConversionHelper.ByteArrayToString(payload);
+
+            // Decode the payload
+
+            // Return a JSON string containing the decoded data
             return JsonConvert.SerializeObject(new { value = result });
         }
-    }       
-}
+    }
+}

Samples/DecoderSample/Classes/Validator.cs

@@ -1,8 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net;
-using System.Threading.Tasks;
+using System.Net;
 
 namespace SensorDecoderModule.Classes
 {

Samples/DecoderSample/Program.cs

@@ -1,12 +1,6 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
-using System.Linq;
-using System.Threading.Tasks;
 using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Configuration;
-using Microsoft.Extensions.Logging;
 
 namespace SensorDecoderModule
 {

Samples/DecoderSample/Startup.cs

@@ -1,18 +1,12 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Diagnostics;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
-using Microsoft.AspNetCore.HttpsPolicy;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
-using Microsoft.Extensions.Logging;
-using Microsoft.Extensions.Options;
 
 namespace SensorDecoderModule
 {