Fix library: Start search from start frame

.idea/.idea.PMS5003/.idea/indexLayout.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ContentModelUserStore">
+  <component name="UserContentModel">
     <attachedFolders />
     <explicitIncludes />
     <explicitExcludes />

PMS5003.sln

@@ -4,6 +4,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PMS5003", "PMS5003\PMS5003.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PMS5003Tests", "PMS5003Tests\PMS5003Tests.csproj", "{AF7541BD-C0B1-42FE-AEFB-1A1D9CEAC6B9}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ConsoleApp1", "ConsoleApp1\ConsoleApp1.csproj", "{92DEDAA4-6A42-4EC5-A534-B1985608BB98}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -18,5 +20,9 @@ Global
 		{AF7541BD-C0B1-42FE-AEFB-1A1D9CEAC6B9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{AF7541BD-C0B1-42FE-AEFB-1A1D9CEAC6B9}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{AF7541BD-C0B1-42FE-AEFB-1A1D9CEAC6B9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{92DEDAA4-6A42-4EC5-A534-B1985608BB98}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{92DEDAA4-6A42-4EC5-A534-B1985608BB98}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{92DEDAA4-6A42-4EC5-A534-B1985608BB98}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{92DEDAA4-6A42-4EC5-A534-B1985608BB98}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 EndGlobal

PMS5003/Exceptions/BufferUnderflowExceptions.cs

@@ -1,16 +0,0 @@
-using System;
-
-namespace PMS5003.Exceptions
-{
-    /// <summary>
-    /// BufferUnderflowExceptions is thrown when the PMS5003 data buffer is incomplete.
-    /// </summary>
-    [Serializable]
-    public class BufferUnderflowException : Exception
-    {
-        public BufferUnderflowException() : base("The PMS5003 data buffer is underrun, not enough bytes read!")
-        {
-            
-        }
-    }
-}

PMS5003/PMS5003.cs

@@ -79,14 +79,28 @@ namespace PMS5003
         public Pms5003Data ReadData()
         {
             var currentTry = 0;
-            const int maxRetries = 5;
+            const int maxRetries = 50;
 
+            var buffer = new byte[32];
             while (currentTry < maxRetries)
             {
                 try
                 {
-                    var buffer = new byte[32];
+                    // Try to find start frame
-                    _serialPort.Read(buffer, 0, 32);
+                    _serialPort.Read(buffer, 0, 1);
+                    if (buffer[0] != Pms5003Constants.StartByte1)
+                    {
+                        continue;
+                    }
+
+                    _serialPort.Read(buffer, 1, 1);
+                    if (buffer[1] != Pms5003Constants.StartByte2)
+                    {
+                        continue;
+                    }
+
+                    // Read rest of data
+                    _serialPort.Read(buffer, 2, 30);
                     return Pms5003Data.FromBytes(buffer);
                 }
                 catch (Exception e)

PMS5003/PMS5003.csproj

@@ -1,10 +1,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <PropertyGroup>
-        <OutputType>Exe</OutputType>
+        <OutputType>Library</OutputType>
         <TargetFramework>netcoreapp3.1</TargetFramework>
         <PackageId>PMS5003</PackageId>
-        <Version>1.0.4</Version>
+        <Version>1.1.0</Version>
         <Authors>Denis Nutiu</Authors>
         <Company>NucuLabs.dev</Company>
         <Description>C# Library for interfacing with the PMS5003 Particulate Matter Sensor.</Description>

PMS5003/Pms5003Data.cs

@@ -38,11 +38,6 @@ namespace PMS5003
         {
             var pms5003Measurement = new Pms5003Data();
             
-            if (buffer.Length < 4)
-            {
-                throw new BufferUnderflowException();
-            }
-
             if (buffer[0] != Pms5003Constants.StartByte1 || buffer[1] != Pms5003Constants.StartByte2)
             {
                 throw new InvalidStartByteException(buffer[0], buffer[1]);

readme.md

@@ -16,7 +16,7 @@ namespace Application
     {
         static void Main(string[] args)
         {
-            var pms = new Pms5003();
+            var pms = new Pms5003("COM3", -1, -1);
             while (true)
             {
                 try