using System;

public class Program

{

    public static void Main()

    {

        string data = "MzOYQgAAHEINBA==";

        var bytes = Convert.FromBase64String(data);

        Console.WriteLine($"Temp:  {BitConverter.ToSingle(bytes, 0),5}");

        Console.WriteLine($"Humid: {BitConverter.ToSingle(bytes, 4),5}");

        Console.WriteLine($"Bat:   {BitConverter.ToUInt16(bytes, 8),5}");

        Console.WriteLine();

        Console.WriteLine(74.48f.ToByteString());

        Console.WriteLine(76.1f.ToByteString());

    }

​

}

​

public static class Ext

{

    public static string ToByteString(this float f)

    {

        var b = BitConverter.GetBytes(f);

        return $"{b[0]}-{b[1]}-{b[2]}-{b[3]}";

    }   

}