update with better structure

src/com/tDiagnostics/Main.java

@@ -2,19 +2,73 @@ package com.tDiagnostics;
 
 //import com.tDiagnostics.device.Connection;
 
-import com.tDiagnostics.device.ConnectDevice;
+import com.fazecast.jSerialComm.SerialPort;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.nio.charset.StandardCharsets;
 
 public class Main {
+    public void main(String[] args) {
+        int lastd = -1;
+        SerialPort comPort2 = SerialPort.getCommPort("COM13");
+        comPort2.setBaudRate(9600);
+        comPort2.setParity(SerialPort.NO_PARITY);
+        comPort2.setNumDataBits(8);
+        comPort2.setNumStopBits(1);
+        comPort2.setComPortTimeouts(SerialPort.TIMEOUT_READ_SEMI_BLOCKING, 500, 500);
+
+        comPort2.openPort();
+        OutputStream out2 = comPort2.getOutputStream();
+        InputStream in2 = comPort2.getInputStream();
+        int d;
+
+        //in2 = InputStream.nullInputStream();
+        while (true) {
+
+
+            try {
+                d = in2.read();
+                if (d != lastd)
+                    System.out.println(d);
+            } catch (IOException e) {
+                d = -1;
+            }
+            //d = 203;
+            lastd = d;
+            if (d == 203) {
+
+                try {
+
+                    StringBuilder str = new StringBuilder();
+                    str.append('D');
+
+
+                    String str2 = str.toString();
+                    out2.write(str2.getBytes(StandardCharsets.UTF_8));
+                    System.out.println(str2);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+
+            } else if (d == 204) {
+
+            } else if (d != -1 && d < 203) {
+                try {
+
+                    StringBuilder str = new StringBuilder();
+                    str.append('G');
 
-    public static void main(String[] args) {
-        // write your code here
 
-        char c = 1;
-        ConnectDevice connection = new ConnectDevice(c);
-        if(connection.startConnection()){
-            System.out.println("Success");
-            return;
+                    str.append(';');
+                    String str2 = str.toString();
+                    out2.write(str2.getBytes(StandardCharsets.UTF_8));
+                    System.out.println(str2);
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
         }
-        System.out.println("failed");
     }
 }