First commit

60 files changed, 1611 insertions, 0 deletions

diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..d18fb5d
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+USB Serial Telnet Server
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..fb7f4a8
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/deploymentTargetDropDown.xml b/.idea/deploymentTargetDropDown.xml
new file mode 100644
index 0000000..8f6e4e0
--- /dev/null
+++ b/.idea/deploymentTargetDropDown.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="deploymentTargetDropDown">
+    <targetSelectedWithDropDown>
+      <Target>
+        <type value="QUICK_BOOT_TARGET" />
+        <deviceKey>
+          <Key>
+            <type value="VIRTUAL_DEVICE_PATH" />
+            <value value="C:\Users\clust\.android\avd\Nexus_5X_API_32.avd" />
+          </Key>
+        </deviceKey>
+      </Target>
+    </targetSelectedWithDropDown>
+    <timeTargetWasSelectedWithDropDown value="2022-05-27T10:08:07.332831600Z" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..a0f7380
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DesignSurface">
+    <option name="filePathToZoomLevelMap">
+      <map>
+        <entry key="..\:/Projects/AndroidStudio/USBSerialTelnetServer/app/src/main/res/drawable-v24/ic_launcher_foreground.xml" value="0.5475" />
+        <entry key="..\:/Projects/AndroidStudio/USBSerialTelnetServer/app/src/main/res/drawable/ic_launcher_background.xml" value="0.5475" />
+        <entry key="..\:/Projects/AndroidStudio/USBSerialTelnetServer/app/src/main/res/layout/activity_main.xml" value="0.31354166666666666" />
+        <entry key="..\:/Projects/AndroidStudio/USBSerialTelnetServer/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml" value="0.5475" />
+      </map>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="Android Studio default JDK" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/build/classes" />
+  </component>
+  <component name="ProjectType">
+    <option name="id" value="Android" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/render.experimental.xml b/.idea/render.experimental.xml
new file mode 100644
index 0000000..8ec256a
--- /dev/null
+++ b/.idea/render.experimental.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RenderSettings">
+    <option name="showDecorations" value="true" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/app/.gitignore b/app/.gitignore
new file mode 100644
index 0000000..42afabf
--- /dev/null
+++ b/app/.gitignore
@@ -0,0 +1 @@
+/build
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
new file mode 100644
index 0000000..89583e7
--- /dev/null
+++ b/app/build.gradle
@@ -0,0 +1,41 @@
+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 32
+
+    defaultConfig {
+        applicationId "com.clusterrr.usbserialtelnetserver"
+        minSdk 26
+        targetSdk 32
+        versionCode 1
+        versionName "1.0"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    applicationVariants.all { variant ->
+        variant.outputs.all { output ->
+            def formattedDate = new Date().format('yyMMdd-HHmmss')
+            outputFileName = "UsbSerialTelnetServer-v${defaultConfig.versionCode}-${formattedDate}.apk"
+        }
+    }
+}
+
+dependencies {
+    implementation 'androidx.appcompat:appcompat:1.4.1'
+    implementation 'com.google.android.material:material:1.6.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
+    implementation 'com.github.mik3y:usb-serial-for-android:3.4.3'
+}
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
new file mode 100644
index 0000000..481bb43
--- /dev/null
+++ b/app/proguard-rules.pro
@@ -0,0 +1,21 @@
+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile
\ No newline at end of file
diff --git a/app/src/androidTest/java/com/clusterrr/usbserialtelnetserver/ExampleInstrumentedTest.java b/app/src/androidTest/java/com/clusterrr/usbserialtelnetserver/ExampleInstrumentedTest.java
new file mode 100644
index 0000000..72b7ade
--- /dev/null
+++ b/app/src/androidTest/java/com/clusterrr/usbserialtelnetserver/ExampleInstrumentedTest.java
@@ -0,0 +1,26 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.clusterrr.usbserialtelnetserver", appContext.getPackageName());
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..3dc5fa2
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.clusterrr.usbserialtelnetserver" >
+
+    <uses-permission android:name="android.permission.INTERNET" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.USBSerialTelnetServer" >
+
+        <service
+            android:name=".UsbSerialTelnetService"
+            android:enabled="true"
+            android:exported="true"/>
+
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop" >
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" />
+            </intent-filter>
+            <meta-data android:name="android.hardware.usb.action.USB_DEVICE_ATTACHED" android:resource="@xml/usb_device_filter"/>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file
diff --git a/app/src/main/ic_launcher-playstore.png b/app/src/main/ic_launcher-playstore.png
new file mode 100644
index 0000000..1ca72ee
--- /dev/null
+++ b/app/src/main/ic_launcher-playstore.png
diff --git a/app/src/main/java/com/clusterrr/usbserialtelnetserver/MainActivity.java b/app/src/main/java/com/clusterrr/usbserialtelnetserver/MainActivity.java
new file mode 100644
index 0000000..0206003
--- /dev/null
+++ b/app/src/main/java/com/clusterrr/usbserialtelnetserver/MainActivity.java
@@ -0,0 +1,258 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import static android.hardware.usb.UsbManager.EXTRA_PERMISSION_GRANTED;
+import static android.view.WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.core.content.ContextCompat;
+
+import android.Manifest;
+import android.annotation.TargetApi;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.content.SharedPreferences;
+import android.content.pm.PackageManager;
+import android.hardware.usb.UsbDeviceConnection;
+import android.hardware.usb.UsbManager;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.os.PowerManager;
+import android.provider.Settings;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.Spinner;
+import android.widget.TextView;
+
+import com.hoho.android.usbserial.driver.UsbSerialDriver;
+import com.hoho.android.usbserial.driver.UsbSerialPort;
+import com.hoho.android.usbserial.driver.UsbSerialProber;
+
+import java.text.ParseException;
+import java.util.List;
+
+public class MainActivity extends AppCompatActivity implements View.OnClickListener, UsbSerialTelnetService.IOnStopListener {
+    final static String SETTING_TCP_PORT = "tcp_port";
+    final static String SETTING_BAUD_RATE = "baud_rate";
+    final static String SETTING_DATA_BITS = "data_bits";
+    final static String SETTING_STOP_BITS = "stop_bits";
+    final static String SETTING_PARITY = "parity";
+
+    UsbSerialTelnetService.ServiceBinder mServiceBinder = null;
+    Button mStartButton;
+    Button mStopButton;
+    EditText mTcpPort;
+    EditText mBaudRate;
+    Spinner mDataBits;
+    Spinner mStopBits;
+    Spinner mParity;
+    TextView mStatus;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        mStartButton = findViewById(R.id.buttonStart);
+        mStopButton = findViewById(R.id.buttonStop);
+        mTcpPort = findViewById(R.id.editTextTcpPort);
+        mBaudRate = findViewById(R.id.editTextNumberBaudRate);
+        mDataBits = findViewById(R.id.spinnerDataBits);
+        mStopBits = findViewById(R.id.spinnerStopBits);
+        mParity = findViewById(R.id.spinnerParity);
+        mStatus = findViewById(R.id.textViewStatus);
+
+        mStartButton.setOnClickListener(this);
+        mStopButton.setOnClickListener(this);
+
+        Intent serviceIntent = new Intent(this, UsbSerialTelnetService.class);
+        bindService(serviceIntent, serviceConnection, 0); // in case it's service already started
+        Intent intent = getIntent();
+        //if (intent != null) onNewIntent(intent);
+
+        updateSettings();
+    }
+
+    @Override
+    protected void onNewIntent(Intent intent) {
+        super.onNewIntent(intent);
+        if (intent != null) {
+            if (intent.getBooleanExtra(UsbSerialTelnetService.KEY_NEED_TO_START, false)) {
+                // Test that permission is granted
+                UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
+                List<UsbSerialDriver> availableDrivers = UsbSerialProber.getDefaultProber().findAllDrivers(manager);
+                if (!availableDrivers.isEmpty()) {
+                    UsbSerialDriver driver = availableDrivers.get(0);
+                    UsbDeviceConnection connection = manager.openDevice(driver.getDevice());
+                    if (connection != null) start();
+                }
+            }
+        }
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        saveSettings();
+    }
+
+    @Override
+    public void onClick(View view)
+    {
+        switch(view.getId())
+        {
+            case R.id.buttonStart:
+                start();
+                break;
+            case R.id.buttonStop:
+                stop();
+                break;
+        }
+    }
+
+    private void start() {
+        saveSettings();
+
+        Intent ignoreOptimization = prepareIntentForWhiteListingOfBatteryOptimization(
+                this, getPackageName(), false);
+        if (ignoreOptimization != null) startActivity(ignoreOptimization);
+
+        Intent serviceIntent = new Intent(this, UsbSerialTelnetService.class);
+        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
+        serviceIntent.putExtra(UsbSerialTelnetService.KEY_TCP_PORT, prefs.getInt(SETTING_TCP_PORT, 2323));
+        serviceIntent.putExtra(UsbSerialTelnetService.KEY_BAUD_RATE, prefs.getInt(SETTING_BAUD_RATE, 115200));
+        serviceIntent.putExtra(UsbSerialTelnetService.KEY_DATA_BITS, prefs.getInt(SETTING_DATA_BITS, 3) + 5);
+        switch (prefs.getInt(SETTING_STOP_BITS, 0)) {
+            case 0:
+                serviceIntent.putExtra(UsbSerialTelnetService.KEY_STOP_BITS, UsbSerialPort.STOPBITS_1);
+                break;
+            case 1:
+                serviceIntent.putExtra(UsbSerialTelnetService.KEY_STOP_BITS, UsbSerialPort.STOPBITS_1_5);
+                break;
+            case 2:
+                serviceIntent.putExtra(UsbSerialTelnetService.KEY_STOP_BITS, UsbSerialPort.STOPBITS_2);
+                break;
+        }
+        serviceIntent.putExtra(UsbSerialTelnetService.KEY_PARITY, prefs.getInt(SETTING_PARITY, 0));
+        startForegroundService(serviceIntent);
+        bindService(serviceIntent, serviceConnection, 0);
+    }
+
+    private void stop() {
+        Intent serviceIntent = new Intent(this, UsbSerialTelnetService.class);
+        stopService(serviceIntent);
+        mServiceBinder = null;
+        updateSettings();
+    }
+
+    private ServiceConnection serviceConnection = new ServiceConnection() {
+        @Override
+        public void onServiceConnected(ComponentName className,
+                                       IBinder service) {
+            mServiceBinder = (UsbSerialTelnetService.ServiceBinder) service;
+            mServiceBinder.setOnStopListener(MainActivity.this);
+            updateSettings();
+            Log.d(UsbSerialTelnetService.TAG, "Service connected");
+        }
+
+        @Override
+        public void onServiceDisconnected(ComponentName componentName) {
+            mServiceBinder = null;
+            Log.d(UsbSerialTelnetService.TAG, "Service disconnected");
+        }
+    };
+
+    @Override
+    public void usbSerialServiceStopped() {
+        updateSettings();
+    }
+    private void saveSettings() {
+        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
+        int tcpPort;
+        try {
+            tcpPort = Integer.parseInt(mTcpPort.getText().toString());
+        }
+        catch (NumberFormatException e) {
+            tcpPort = 2323;
+        }
+        int baudRate;
+        try {
+            baudRate = Integer.parseInt(mBaudRate.getText().toString());
+        }
+        catch (NumberFormatException e) {
+            baudRate = 115200;
+        }
+        prefs.edit()
+                .putInt(SETTING_TCP_PORT, tcpPort)
+                .putInt(SETTING_BAUD_RATE, baudRate)
+                .putInt(SETTING_DATA_BITS, mDataBits.getSelectedItemPosition())
+                .putInt(SETTING_STOP_BITS, mStopBits.getSelectedItemPosition())
+                .putInt(SETTING_PARITY, mParity.getSelectedItemPosition())
+                .commit();
+    }
+
+    private void updateSettings() {
+        SharedPreferences prefs = getPreferences(Context.MODE_PRIVATE);
+        boolean started = mServiceBinder != null && mServiceBinder.isStarted();
+        mStartButton.setEnabled(!started);
+        mStopButton.setEnabled(started);
+        mTcpPort.setEnabled(!started);
+        mBaudRate.setEnabled(!started);
+        mDataBits.setEnabled(!started);
+        mStopBits.setEnabled(!started);
+        mParity.setEnabled(!started);
+        mTcpPort.setText(String.valueOf(prefs.getInt(SETTING_TCP_PORT, 2323)));
+        mBaudRate.setText(String.valueOf(prefs.getInt(SETTING_BAUD_RATE, 115200)));
+        mDataBits.setSelection(prefs.getInt(SETTING_DATA_BITS, 3));
+        mStopBits.setSelection(prefs.getInt(SETTING_STOP_BITS, 0));
+        mParity.setSelection(prefs.getInt(SETTING_PARITY, 0));
+        if (started)
+             mStatus.setText("Started, please connect to: telnet://" + UsbSerialTelnetService.getIPAddress() + ": "+ mTcpPort.getText());
+        else
+            mStatus.setText("Not started");
+    }
+
+    public static Intent prepareIntentForWhiteListingOfBatteryOptimization(Context context, String packageName, boolean alsoWhenWhiteListed) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+            return null;
+        if (ContextCompat.checkSelfPermission(context, Manifest.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS) == PackageManager.PERMISSION_DENIED)
+            return null;
+        final WhiteListedInBatteryOptimizations appIsWhiteListedFromPowerSave = getIfAppIsWhiteListedFromBatteryOptimizations(context, packageName);
+        Intent intent = null;
+        switch (appIsWhiteListedFromPowerSave) {
+            case WHITE_LISTED:
+                if (alsoWhenWhiteListed)
+                    intent = new Intent(Settings.ACTION_IGNORE_BATTERY_OPTIMIZATION_SETTINGS);
+                break;
+            case NOT_WHITE_LISTED:
+                intent = new Intent(Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS).setData(Uri.parse("package:" + packageName));
+                break;
+            case ERROR_GETTING_STATE:
+            case UNKNOWN_TOO_OLD_ANDROID_API_FOR_CHECKING:
+            case IRRELEVANT_OLD_ANDROID_API:
+            default:
+                break;
+        }
+        return intent;
+    }
+
+    public enum WhiteListedInBatteryOptimizations {
+        WHITE_LISTED, NOT_WHITE_LISTED, ERROR_GETTING_STATE, UNKNOWN_TOO_OLD_ANDROID_API_FOR_CHECKING, IRRELEVANT_OLD_ANDROID_API
+    }
+
+    public static WhiteListedInBatteryOptimizations getIfAppIsWhiteListedFromBatteryOptimizations(Context context, String packageName) {
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP)
+            return WhiteListedInBatteryOptimizations.IRRELEVANT_OLD_ANDROID_API;
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
+            return WhiteListedInBatteryOptimizations.UNKNOWN_TOO_OLD_ANDROID_API_FOR_CHECKING;
+        final PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
+        if (pm == null)
+            return WhiteListedInBatteryOptimizations.ERROR_GETTING_STATE;
+        return pm.isIgnoringBatteryOptimizations(packageName) ? WhiteListedInBatteryOptimizations.WHITE_LISTED : WhiteListedInBatteryOptimizations.NOT_WHITE_LISTED;
+    }
+
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpClientThread.java b/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpClientThread.java
new file mode 100644
index 0000000..3e793ab
--- /dev/null
+++ b/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpClientThread.java
@@ -0,0 +1,144 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.Socket;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TcpClientThread extends Thread {
+    private UsbSerialTelnetService mUsbSerialTelnetService;
+    private TcpServerThread mTcpServerThread;
+    private Socket mSocket;
+    private InputStream mDataInputStream;
+    private OutputStream mDataOutputStream;
+    private String mAddress;
+    private List<Byte> mBuffer;
+
+    public TcpClientThread(UsbSerialTelnetService usbSerialTelnetService, TcpServerThread tcpServerThread, Socket socket) throws IOException {
+        mUsbSerialTelnetService = usbSerialTelnetService;
+        mTcpServerThread = tcpServerThread;
+        mSocket = socket;
+        mDataInputStream = mSocket.getInputStream();
+        mDataOutputStream = mSocket.getOutputStream();
+        mAddress = mSocket.getRemoteSocketAddress().toString();
+        mBuffer = new ArrayList<>();
+    }
+
+    @Override
+    public void run() {
+        byte buffer[] = new byte[1024];
+
+        try {
+            mDataOutputStream.write(new byte[]{(byte) 0xFF, (byte) 0xFD, (byte) 0x03}); // Do Suppress Go Ahead
+            mDataOutputStream.write(new byte[]{(byte) 0xFF, (byte) 0xFB, (byte) 0x03}); // Will Suppress Go Ahead
+            mDataOutputStream.write(new byte[]{(byte) 0xFF, (byte) 0xFB, (byte) 0x01}); // Will Echo
+            while (true) {
+                if (mDataInputStream == null) break;
+                int l = mDataInputStream.read(buffer);
+                if (l <= 0) break; // disconnect
+                for (int i = 0; i < l; i++)
+                    mBuffer.add(buffer[i]);
+                proceedBuffer();
+            }
+        }
+        catch (SocketException e) {
+            Log.i(UsbSerialTelnetService.TAG, mAddress + ": " + e.getMessage());
+        }
+        catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        try {
+            if (mSocket != null)
+                mSocket.close();
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        mSocket = null;
+        mDataInputStream = null;
+        mDataOutputStream = null;
+        mTcpServerThread.removeClient(this);
+        Log.i(UsbSerialTelnetService.TAG, mAddress + ": stopped");
+    }
+
+    private void proceedBuffer() throws IOException {
+        int len = mBuffer.size();
+        int i = 0;
+        byte[] output = new byte[len];
+        int outputSize = 0;
+        for (; i < len; i++) {
+            byte b = mBuffer.get(i);
+            if (b == 0) continue;
+            if (b == '\n') continue;
+            /*
+            if ((b == '\r') && ((i >= len) || (mBuffer.get(i + 1) == '\n'))) {
+                // skip \r\n
+                if (true)
+                    continue;
+            }
+             */
+            if (b == (byte)0xFF) {
+                if (i >= len) break;
+                byte next = mBuffer.get(i + 1);
+                if (next == (byte)0xFF) {
+                    // just 0xFF
+                    //mUsbSerialTelnetService.writePort((byte) 0xFF);
+                    output[outputSize++] = (byte)0xFF;
+                    i++;
+                    continue;
+                }
+                // Command
+                if (i + 1 >= len) break;
+                byte cmd = next;
+                byte opt = mBuffer.get(i + 2);
+                Log.d(UsbSerialTelnetService.TAG, "Telnet command: CMD=" + Integer.toHexString(cmd >= 0 ? cmd : cmd + 256) + " ARG=" + Integer.toHexString(opt >= 0 ? opt : opt + 256));
+                i += 2;
+                continue;
+            }
+            // just data
+            //mUsbSerialTelnetService.writePort(b);
+            output[outputSize++] = b;
+        }
+
+        // Remove proceeded
+        for (int j = 0; j < i; j++)
+            mBuffer.remove(0);
+
+        mUsbSerialTelnetService.writeSerialPort(output, 0, outputSize);
+    }
+
+    public void write(byte[] data) throws IOException {
+        write(data, 0, data.length);
+    }
+
+    public void write(byte[] data, int offset, int len) throws IOException {
+        if (mDataOutputStream != null)
+            mDataOutputStream.write(data, offset, len);
+        //Log.d(UsbSerialTelnetService.TAG, "Writing " + len + " bytes to TCP");
+    }
+
+    public void close() {
+        try {
+            if (mSocket != null) {
+                mSocket.close();
+                mSocket = null;
+            }
+            if (mDataOutputStream != null) {
+                mDataOutputStream.close();
+                mDataOutputStream = null;
+            }
+            if (mDataInputStream != null)
+            {
+                mDataInputStream.close();
+                mDataInputStream = null;
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpServerThread.java b/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpServerThread.java
new file mode 100644
index 0000000..b18c516
--- /dev/null
+++ b/app/src/main/java/com/clusterrr/usbserialtelnetserver/TcpServerThread.java
@@ -0,0 +1,91 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import android.util.Log;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.SocketException;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TcpServerThread extends Thread {
+    private UsbSerialTelnetService mUsbSerialTelnetService;
+    private ServerSocket mTcpServer;
+    private List<TcpClientThread> mClients;
+
+    public TcpServerThread(UsbSerialTelnetService usbSerialTelnetService, ServerSocket tcpServer)
+    {
+        mUsbSerialTelnetService = usbSerialTelnetService;
+        mTcpServer = tcpServer;
+        mClients = new ArrayList<>();
+    }
+
+    @Override
+    public void run() {
+        try {
+            while (true) {
+                if (mTcpServer == null) break;
+                Socket socket = mTcpServer.accept();
+                Log.i(UsbSerialTelnetService.TAG, "Connected: " + socket.getRemoteSocketAddress());
+                TcpClientThread client = new TcpClientThread(mUsbSerialTelnetService, this, socket);
+                client.start();
+                mClients.add(client);
+            }
+        }
+        catch (SocketException e) {
+            Log.i(UsbSerialTelnetService.TAG, "Server: " + e.getMessage());
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        close();
+        Log.i(UsbSerialTelnetService.TAG, "Server: stopped");
+    }
+
+    public void removeClient(TcpClientThread tcpClientThread) {
+        mClients.remove(tcpClientThread);
+    }
+
+    public void write(byte[] data) throws IOException {
+        write(data, 0, data.length);
+    }
+
+    public void write(byte[] data, int offset, int len) throws IOException {
+        List<TcpClientThread> toRemove = new ArrayList<>();
+        for (TcpClientThread client : mClients) {
+            try {
+                client.write(data, offset, len);
+            }
+            catch (Exception ex) {
+                ex.printStackTrace();
+                toRemove.add(client);
+            }
+        }
+        for (TcpClientThread client : toRemove) {
+            client.close();
+            mClients.remove(client);
+        }
+    }
+
+    public void close()
+    {
+        try {
+            if (mTcpServer != null) {
+                mTcpServer.close();
+                mTcpServer = null;
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+        for (TcpClientThread client : mClients) {
+            try {
+                client.close();
+            }
+            catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+        mClients.clear();
+    }
+}
diff --git a/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialTelnetService.java b/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialTelnetService.java
new file mode 100644
index 0000000..eb0f292
--- /dev/null
+++ b/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialTelnetService.java
@@ -0,0 +1,241 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import android.app.Notification;
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.graphics.BitmapFactory;
+import android.hardware.usb.UsbDeviceConnection;
+import android.hardware.usb.UsbManager;
+import android.os.Binder;
+import android.os.Handler;
+import android.os.IBinder;
+import android.os.Looper;
+import android.util.Log;
+import android.widget.Toast;
+
+import androidx.core.app.NotificationCompat;
+
+import com.hoho.android.usbserial.driver.UsbSerialDriver;
+import com.hoho.android.usbserial.driver.UsbSerialPort;
+import com.hoho.android.usbserial.driver.UsbSerialProber;
+import com.hoho.android.usbserial.util.SerialInputOutputManager;
+
+import java.io.IOException;
+import java.net.Inet4Address;
+import java.net.Inet6Address;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.InterfaceAddress;
+import java.net.NetworkInterface;
+import java.net.ServerSocket;
+import java.net.SocketAddress;
+import java.nio.charset.StandardCharsets;
+import java.util.Enumeration;
+import java.util.List;
+
+public class UsbSerialTelnetService extends Service {
+    final static String TAG = "UsbSerialTelnet";
+    final static String KEY_NEED_TO_START = "need_to_start";
+//    final static String START_INTENT = "com.clusterrr.usbserialtelnetserver.START";
+//    final static String STOP_INTENT = "com.clusterrr.usbserialtelnetserver.STOP";
+//    final static String STARTED_INTENT = "com.clusterrr.usbserialtelnetserver.STARTED";
+//    final static String STOPPED_INTENT = "com.clusterrr.usbserialtelnetserver.STOPPED";
+    final static String KEY_TCP_PORT = "tcp_port";
+    final static String KEY_BAUD_RATE = "baud_rate";
+    final static String KEY_DATA_BITS = "data_bits";
+    final static String KEY_STOP_BITS = "stop_bits";
+    final static String KEY_PARITY = "parity";
+
+    boolean mStarted = false;
+    //UsbSerialPort mSerialPort = null;
+    UsbSerialThread mUsbSerialThread = null;
+    TcpServerThread mTcpServerThread = null;
+
+    int mTcpPort = 2323;
+
+    public UsbSerialTelnetService() {
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return mBinder;
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId)
+    {
+        if (mStarted) {
+            // Already started
+            new Handler(Looper.getMainLooper()).post(() -> Toast.makeText(UsbSerialTelnetService.this.getApplicationContext(), "Already started", Toast.LENGTH_LONG).show());
+            return START_STICKY;
+        }
+
+        String message = getString(R.string.app_name) + " started";
+        boolean success = false;
+
+        try {
+            // Find all available drivers from attached devices.
+            UsbManager manager = (UsbManager) getSystemService(Context.USB_SERVICE);
+            List<UsbSerialDriver> availableDrivers = UsbSerialProber.getDefaultProber().findAllDrivers(manager);
+            if (availableDrivers.isEmpty()) {
+                message = "Error: USB serial device not found";
+            } else {
+                // Open a connection to the first available driver.
+                UsbSerialDriver driver = availableDrivers.get(0);
+                UsbDeviceConnection connection = manager.openDevice(driver.getDevice());
+                if (connection == null) {
+                    message = null; // "Please grant permission and try again";
+                    Intent mainActivityStartIntent = new Intent(this, MainActivity.class);
+                    mainActivityStartIntent.putExtra(KEY_NEED_TO_START, true);
+                    mainActivityStartIntent.setAction(KEY_NEED_TO_START);
+                    PendingIntent mainActivityStartPendingIntent = PendingIntent.getActivity(this, 0, mainActivityStartIntent, PendingIntent.FLAG_IMMUTABLE);
+                    manager.requestPermission(driver.getDevice(), mainActivityStartPendingIntent);
+                } else {
+                    UsbSerialPort serialPort = driver.getPorts().get(0); // Most devices have just one port (port 0)
+                    serialPort.open(connection);
+                    serialPort.setParameters(
+                            intent.getIntExtra(KEY_BAUD_RATE, 115200),
+                            intent.getIntExtra(KEY_DATA_BITS, 8),
+                            intent.getIntExtra(KEY_STOP_BITS, UsbSerialPort.STOPBITS_1),
+                            intent.getIntExtra(KEY_PARITY, UsbSerialPort.PARITY_NONE));
+                    ServerSocket serverSocket = new ServerSocket(intent.getIntExtra(KEY_TCP_PORT,2323));
+                    mUsbSerialThread = new UsbSerialThread(this, serialPort);
+                    mTcpServerThread = new TcpServerThread(this, serverSocket);
+                    mUsbSerialThread.start();
+                    mTcpServerThread.start();
+                    success = true;
+                }
+            }
+        }
+        catch (Exception ex) {
+            message = "Error: " + ex.getMessage();
+            ex.printStackTrace();
+        }
+
+        Intent mainActivityIntent = new Intent(this, MainActivity.class);
+        PendingIntent mainActivityPendingIntent = PendingIntent.getActivity(this, 0, mainActivityIntent, PendingIntent.FLAG_IMMUTABLE);
+        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
+            NotificationChannel channel = new NotificationChannel(TAG,
+                    getString(R.string.app_name),
+                    NotificationManager.IMPORTANCE_DEFAULT);
+            channel.setDescription(getString(R.string.app_name));
+            nm.createNotificationChannel(channel);
+        }
+        Notification notification = new NotificationCompat.Builder(this, TAG)
+                .setOngoing(true)
+                .setSmallIcon(R.mipmap.ic_notification)
+                .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.mipmap.ic_launcher))
+                .setContentTitle(message)
+                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                .setCategory(Notification.CATEGORY_SERVICE)
+                .setShowWhen(false)
+                .setContentIntent(mainActivityPendingIntent)
+                .build();
+
+        if (message != null) {
+            final String msg = message;
+            new Handler(Looper.getMainLooper()).post(() -> Toast.makeText(UsbSerialTelnetService.this.getApplicationContext(), msg, Toast.LENGTH_SHORT).show());
+        }
+
+        startForeground(1, notification);
+
+        if (success) {
+            if (message != null)
+                Log.i(TAG, message);
+            Log.d(TAG, String.format("Local IP Address: %s", getIPAddress()));
+            mStarted = true;
+        } else {
+            if (message != null)
+                Log.e(TAG, message);
+            stopSelf();
+            mStarted = false;
+        }
+        return START_STICKY;
+    }
+
+    public static String getIPAddress() {
+        try {
+            Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
+            while (networkInterfaces.hasMoreElements()) {
+                NetworkInterface networkInterface = networkInterfaces.nextElement();
+                if (networkInterface.isUp()) {
+                    String name = networkInterface.getName();
+                    if (name.toLowerCase().equals("wlan0") || name.toLowerCase().equals("rmnet0")) {
+                        List<InterfaceAddress> interfaceAddresses = networkInterface.getInterfaceAddresses();
+                        for (InterfaceAddress interfaceAddress : interfaceAddresses) {
+                            InetAddress address = interfaceAddress.getAddress();
+                            if (address instanceof Inet4Address){
+                                return address.getHostAddress();
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return "localhost";
+    }
+
+    @Override
+    public void onDestroy()
+    {
+        NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
+        nm.cancel(1);
+        if (mTcpServerThread != null) {
+            mTcpServerThread.close();
+            mTcpServerThread = null;
+        }
+        if (mUsbSerialThread != null) {
+            mUsbSerialThread.close();
+            mUsbSerialThread = null;
+        }
+        if (mStarted)
+            new Handler(Looper.getMainLooper()).post(() -> Toast.makeText(UsbSerialTelnetService.this.getApplicationContext(), getString(R.string.app_name) + " stopped", Toast.LENGTH_SHORT).show());
+        Log.i(TAG, "Service stopped");
+        mStarted = false;
+        mBinder.stopped();
+    }
+
+    private final ServiceBinder mBinder = new ServiceBinder();
+    public class ServiceBinder extends Binder {
+        private IOnStopListener onStopListener = null;
+        public boolean isStarted()
+        {
+            return mStarted;
+        }
+        public void setOnStopListener(IOnStopListener listener) { onStopListener = listener; }
+        public void stopped() { if (onStopListener != null) onStopListener.usbSerialServiceStopped(); }
+    }
+    public interface IOnStopListener
+    {
+        public void usbSerialServiceStopped();
+    }
+
+    public void writeSerialPort(byte[] buffer) throws IOException {
+        if (mUsbSerialThread == null) return;
+        mUsbSerialThread.write(buffer);
+    }
+
+    public void writeSerialPort(byte[] buffer, int pos, int len) throws IOException {
+        if (mUsbSerialThread == null) return;
+        byte[] writeBuffer = new byte[len];
+        System.arraycopy(buffer, pos, writeBuffer, 0, len);
+        mUsbSerialThread.write(writeBuffer);
+    }
+
+    public void writeClients(byte[] buffer) throws IOException {
+        if (mTcpServerThread == null) return;
+        mTcpServerThread.write(buffer);
+    }
+
+    public void writeClients(byte[] buffer, int pos, int len) throws IOException {
+        if (mTcpServerThread == null) return;
+        mTcpServerThread.write(buffer, pos, len);
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialThread.java b/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialThread.java
new file mode 100644
index 0000000..6bfe4e6
--- /dev/null
+++ b/app/src/main/java/com/clusterrr/usbserialtelnetserver/UsbSerialThread.java
@@ -0,0 +1,60 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import android.util.Log;
+
+import com.hoho.android.usbserial.driver.UsbSerialPort;
+
+import java.io.IOException;
+import java.net.ServerSocket;
+import java.net.SocketException;
+
+public class UsbSerialThread extends Thread {
+    final static int WRITE_TIMEOUT = 1000;
+
+    private UsbSerialTelnetService mUsbSerialTelnetService;
+    private UsbSerialPort mSerialPort;
+
+    public UsbSerialThread(UsbSerialTelnetService usbSerialTelnetService, UsbSerialPort serialPort) {
+        mUsbSerialTelnetService = usbSerialTelnetService;
+        mSerialPort = serialPort;
+    }
+
+    @Override
+    public void run() {
+        byte buffer[] = new byte[1024];
+
+        try {
+            while (true) {
+                if (mSerialPort == null) break;
+                int l = mSerialPort.read(buffer, 0);
+                if (l <= 0) break; // disconnect
+                mUsbSerialTelnetService.writeClients(buffer, 0, l);
+            }
+        }
+        catch (IOException e) {
+            Log.i(UsbSerialTelnetService.TAG, "Serial port: " + e.getMessage());
+        }
+        catch (Exception e) {
+            e.printStackTrace();
+        }
+        close();
+        Log.i(UsbSerialTelnetService.TAG, "Serial port closed");
+        mUsbSerialTelnetService.stopSelf();
+    }
+
+    public void write(byte[] data) throws IOException {
+        if (mSerialPort != null)
+            mSerialPort.write(data, WRITE_TIMEOUT);
+    }
+
+    public void close() {
+        try {
+            if (mSerialPort != null) {
+                mSerialPort.close();
+                mSerialPort = null;
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/res/color/text_color.xml b/app/src/main/res/color/text_color.xml
new file mode 100644
index 0000000..1cf3b79
--- /dev/null
+++ b/app/src/main/res/color/text_color.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_enabled="false" android:color="#80000000"/>
+    <item android:color="#FF000000"/>
+</selector>
diff --git a/app/src/main/res/color/text_color_dark.xml b/app/src/main/res/color/text_color_dark.xml
new file mode 100644
index 0000000..922c96a
--- /dev/null
+++ b/app/src/main/res/color/text_color_dark.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <item android:state_enabled="false" android:color="#80FFFFFF"/>
+    <item android:color="#FFFFFFFF"/>
+</selector>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..20ffbb6
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,178 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:layout_gravity="center_horizontal"
+    tools:context=".MainActivity">
+
+    <Button
+        android:id="@+id/buttonStart"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginEnd="16dp"
+        android:layout_marginBottom="16dp"
+        android:text="Start"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toStartOf="@+id/buttonStop"
+        app:layout_constraintStart_toStartOf="parent" />
+
+    <Button
+        android:id="@+id/buttonStop"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="8dp"
+        android:layout_marginEnd="24dp"
+        android:layout_marginBottom="16dp"
+        android:text="Stop"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toEndOf="@+id/buttonStart" />
+
+    <TextView
+        android:id="@+id/textViewStatus"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="24dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="24dp"
+        android:layout_marginBottom="16dp"
+        android:gravity="center"
+        android:text="status"
+        app:layout_constraintBottom_toTopOf="@+id/buttonStart"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/scrollView2" />
+
+    <ScrollView
+        android:id="@+id/scrollView2"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:layout_marginTop="16dp"
+        app:layout_constraintBottom_toTopOf="@+id/textViewStatus"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <androidx.constraintlayout.widget.ConstraintLayout
+            android:layout_width="400dp"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal">
+
+            <TextView
+                android:id="@+id/textViewTcpPort"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="24dp"
+                android:text="TCP port to listen"
+                app:layout_constraintBottom_toBottomOf="@+id/editTextTcpPort"
+                app:layout_constraintEnd_toStartOf="@+id/editTextTcpPort"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/editTextTcpPort" />
+
+            <EditText
+                android:id="@+id/editTextTcpPort"
+                android:layout_width="0dp"
+                android:layout_height="48dp"
+                android:layout_marginEnd="24dp"
+                android:ems="10"
+                android:inputType="number"
+                android:maxLength="5"
+                android:text="0"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/textViewTcpPort"
+                app:layout_constraintTop_toTopOf="parent" />
+
+            <TextView
+                android:id="@+id/textViewBaudRate"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="24dp"
+                android:text="Baud rate"
+                app:layout_constraintBottom_toBottomOf="@+id/editTextNumberBaudRate"
+                app:layout_constraintEnd_toStartOf="@+id/editTextNumberBaudRate"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/editTextNumberBaudRate" />
+
+            <EditText
+                android:id="@+id/editTextNumberBaudRate"
+                android:layout_width="0dp"
+                android:layout_height="48dp"
+                android:layout_marginEnd="24dp"
+                android:ems="10"
+                android:inputType="number"
+                android:maxLength="6"
+                android:text="0"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/textViewBaudRate"
+                app:layout_constraintTop_toBottomOf="@+id/editTextTcpPort" />
+
+            <TextView
+                android:id="@+id/textViewDataBits"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="24dp"
+                android:text="Data bits"
+                app:layout_constraintBottom_toBottomOf="@+id/spinnerDataBits"
+                app:layout_constraintEnd_toStartOf="@+id/spinnerDataBits"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/spinnerDataBits" />
+
+            <Spinner
+                android:id="@+id/spinnerDataBits"
+                android:layout_width="0dp"
+                android:layout_height="48dp"
+                android:layout_marginEnd="24dp"
+                android:entries="@array/data_bits"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/textViewDataBits"
+                app:layout_constraintTop_toBottomOf="@+id/editTextNumberBaudRate" />
+
+            <TextView
+                android:id="@+id/textViewStopBits"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="24dp"
+                android:text="Stop bits"
+                app:layout_constraintBottom_toBottomOf="@+id/spinnerStopBits"
+                app:layout_constraintEnd_toStartOf="@+id/spinnerStopBits"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/spinnerStopBits" />
+
+            <Spinner
+                android:id="@+id/spinnerStopBits"
+                android:layout_width="0dp"
+                android:layout_height="48dp"
+                android:layout_marginEnd="24dp"
+                android:entries="@array/stop_bits"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/textViewStopBits"
+                app:layout_constraintTop_toBottomOf="@+id/spinnerDataBits" />
+
+            <TextView
+                android:id="@+id/textViewParity"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="24dp"
+                android:text="Parity"
+                app:layout_constraintBottom_toBottomOf="@+id/spinnerParity"
+                app:layout_constraintEnd_toStartOf="@+id/spinnerParity"
+                app:layout_constraintStart_toStartOf="parent"
+                app:layout_constraintTop_toTopOf="@+id/spinnerParity" />
+
+            <Spinner
+                android:id="@+id/spinnerParity"
+                android:layout_width="0dp"
+                android:layout_height="48dp"
+                android:layout_marginEnd="24dp"
+                android:entries="@array/parity"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toEndOf="@+id/textViewParity"
+                app:layout_constraintTop_toBottomOf="@+id/spinnerStopBits" />
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+    </ScrollView>
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
new file mode 100644
index 0000000..4ae7d12
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
new file mode 100644
index 0000000..4ae7d12
--- /dev/null
+++ b/app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@mipmap/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>
\ No newline at end of file
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher.png b/app/src/main/res/mipmap-hdpi/ic_launcher.png
new file mode 100644
index 0000000..657a790
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_background.png b/app/src/main/res/mipmap-hdpi/ic_launcher_background.png
new file mode 100644
index 0000000..2222ba6
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_background.png
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_foreground.png b/app/src/main/res/mipmap-hdpi/ic_launcher_foreground.png
new file mode 100644
index 0000000..01f6633
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_foreground.png
diff --git a/app/src/main/res/mipmap-hdpi/ic_launcher_round.png b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
new file mode 100644
index 0000000..17c3435
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-hdpi/ic_notification.png b/app/src/main/res/mipmap-hdpi/ic_notification.png
new file mode 100644
index 0000000..052830e
--- /dev/null
+++ b/app/src/main/res/mipmap-hdpi/ic_notification.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher.png b/app/src/main/res/mipmap-mdpi/ic_launcher.png
new file mode 100644
index 0000000..0fb2b44
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_background.png b/app/src/main/res/mipmap-mdpi/ic_launcher_background.png
new file mode 100644
index 0000000..c99ed4f
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_background.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_foreground.png b/app/src/main/res/mipmap-mdpi/ic_launcher_foreground.png
new file mode 100644
index 0000000..c0092be
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_foreground.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_launcher_round.png b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
new file mode 100644
index 0000000..ebe7895
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-mdpi/ic_notification.png b/app/src/main/res/mipmap-mdpi/ic_notification.png
new file mode 100644
index 0000000..5a7430c
--- /dev/null
+++ b/app/src/main/res/mipmap-mdpi/ic_notification.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher.png b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
new file mode 100644
index 0000000..5e4b8c5
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_background.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_background.png
new file mode 100644
index 0000000..8a2820b
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_background.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_foreground.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_foreground.png
new file mode 100644
index 0000000..b7278e5
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_foreground.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..59fd94f
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xhdpi/ic_notification.png b/app/src/main/res/mipmap-xhdpi/ic_notification.png
new file mode 100644
index 0000000..caa5017
--- /dev/null
+++ b/app/src/main/res/mipmap-xhdpi/ic_notification.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
new file mode 100644
index 0000000..6d6c2b2
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_background.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_background.png
new file mode 100644
index 0000000..5d2d608
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_background.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_foreground.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_foreground.png
new file mode 100644
index 0000000..9823908
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_foreground.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..387efaa
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xxhdpi/ic_notification.png b/app/src/main/res/mipmap-xxhdpi/ic_notification.png
new file mode 100644
index 0000000..6407767
--- /dev/null
+++ b/app/src/main/res/mipmap-xxhdpi/ic_notification.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
new file mode 100644
index 0000000..d20b769
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_background.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_background.png
new file mode 100644
index 0000000..d56fc50
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_background.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_foreground.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_foreground.png
new file mode 100644
index 0000000..d1e872f
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_foreground.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
new file mode 100644
index 0000000..a67f028
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png
diff --git a/app/src/main/res/mipmap-xxxhdpi/ic_notification.png b/app/src/main/res/mipmap-xxxhdpi/ic_notification.png
new file mode 100644
index 0000000..f116fa9
--- /dev/null
+++ b/app/src/main/res/mipmap-xxxhdpi/ic_notification.png
diff --git a/app/src/main/res/values-night/themes.xml b/app/src/main/res/values-night/themes.xml
new file mode 100644
index 0000000..6033bd9
--- /dev/null
+++ b/app/src/main/res/values-night/themes.xml
@@ -0,0 +1,18 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.USBSerialTelnetServer" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/blue_light</item>
+        <item name="colorPrimaryVariant">@color/blue</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+        <item name="android:textColor">@color/text_color_dark</item>
+        <item name="android:textColorPrimary">@color/text_color_dark</item>
+    </style>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
new file mode 100644
index 0000000..6733ad4
--- /dev/null
+++ b/app/src/main/res/values/colors.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+    <color name="blue">#FF0000FF</color>
+    <color name="blue_dark">#FF000080</color>
+    <color name="blue_light">#FFC0C0FF</color>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..72528ed
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,22 @@
+<resources>
+    <string name="app_name">USB Serial Telnet Server</string>
+    <string-array name="data_bits">
+        <item>5</item>
+        <item>6</item>
+        <item>7</item>
+        <item>8</item>
+        <item>9</item>
+    </string-array>
+    <string-array name="stop_bits">
+        <item>1 stop bit</item>
+        <item>1.5 stop bits</item>
+        <item>2 stop bits</item>
+    </string-array>
+    <string-array name="parity">
+        <item>None</item>
+        <item>Odd</item>
+        <item>Even</item>
+        <item>Mark</item>
+        <item>Space</item>
+    </string-array>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/themes.xml b/app/src/main/res/values/themes.xml
new file mode 100644
index 0000000..21e2869
--- /dev/null
+++ b/app/src/main/res/values/themes.xml
@@ -0,0 +1,18 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.USBSerialTelnetServer" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/blue_dark</item>
+        <item name="colorPrimaryVariant">@color/blue</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor" tools:targetApi="l">@color/blue_dark</item>
+        <!-- Customize your theme here. -->
+        <item name="android:textColor">@color/text_color</item>
+        <item name="android:textColorPrimary">@color/text_color</item>
+    </style>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/usb_device_filter.xml b/app/src/main/res/xml/usb_device_filter.xml
new file mode 100644
index 0000000..f0608aa
--- /dev/null
+++ b/app/src/main/res/xml/usb_device_filter.xml
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <usb-device product-id="24577" vendor-id="1027" />
+    <usb-device product-id="24592" vendor-id="1027" />
+    <usb-device product-id="24593" vendor-id="1027" />
+    <usb-device product-id="24596" vendor-id="1027" />
+    <usb-device product-id="24597" vendor-id="1027" />
+    <usb-device product-id="60000" vendor-id="4292" />
+    <usb-device product-id="60016" vendor-id="4292" />
+    <usb-device product-id="60017" vendor-id="4292" />
+    <usb-device product-id="8963" vendor-id="1659" />
+    <usb-device product-id="9123" vendor-id="1659" />
+    <usb-device product-id="9139" vendor-id="1659" />
+    <usb-device product-id="9155" vendor-id="1659" />
+    <usb-device product-id="9171" vendor-id="1659" />
+    <usb-device product-id="9187" vendor-id="1659" />
+    <usb-device product-id="9203" vendor-id="1659" />
+    <usb-device product-id="21795" vendor-id="6790" />
+    <usb-device product-id="29987" vendor-id="6790" />
+    <usb-device vendor-id="9025" />
+    <usb-device product-id="1155" vendor-id="5824" />
+    <usb-device product-id="8260" vendor-id="1003" />
+    <usb-device product-id="4" vendor-id="7855" />
+    <usb-device product-id="516" vendor-id="3368" />
+    <usb-device product-id="22336" vendor-id="1155" />
+</resources>
diff --git a/app/src/test/java/com/clusterrr/usbserialtelnetserver/ExampleUnitTest.java b/app/src/test/java/com/clusterrr/usbserialtelnetserver/ExampleUnitTest.java
new file mode 100644
index 0000000..ca21106
--- /dev/null
+++ b/app/src/test/java/com/clusterrr/usbserialtelnetserver/ExampleUnitTest.java
@@ -0,0 +1,17 @@
+package com.clusterrr.usbserialtelnetserver;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() {
+        assertEquals(4, 2 + 2);
+    }
+}
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..2fcc7ef
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,9 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
+    id 'com.android.application' version '7.1.2' apply false
+    id 'com.android.library' version '7.1.2' apply false
+}
+
+task clean(type: Delete) {
+    delete rootProject.buildDir
+}
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
new file mode 100644
index 0000000..dab7c28
--- /dev/null
+++ b/gradle.properties
@@ -0,0 +1,21 @@
+# Project-wide Gradle settings.
+# IDE (e.g. Android Studio) users:
+# Gradle settings configured through the IDE *will override*
+# any settings specified in this file.
+# For more details on how to configure your build environment visit
+# http://www.gradle.org/docs/current/userguide/build_environment.html
+# Specifies the JVM arguments used for the daemon process.
+# The setting is particularly useful for tweaking memory settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+# When configured, Gradle will run in incubating parallel mode.
+# This option should only be used with decoupled projects. More details, visit
+# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects
+# org.gradle.parallel=true
+# AndroidX package structure to make it clearer which packages are bundled with the
+# Android operating system, and which are packaged with your app"s APK
+# https://developer.android.com/topic/libraries/support-library/androidx-rn
+android.useAndroidX=true
+# Enables namespacing of each library's R class so that its R class includes only the
+# resources declared in the library itself and none from the library's dependencies,
+# thereby reducing the size of the R class for that library
+android.nonTransitiveRClass=true
\ No newline at end of file
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..38fefc9
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,6 @@
+#Fri May 27 11:38:17 MSK 2022
+distributionBase=GRADLE_USER_HOME
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+distributionPath=wrapper/dists
+zipStorePath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..4f906e0
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..107acd3
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..cd354ff
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,17 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+        maven { url 'https://jitpack.io' }
+    }
+}
+rootProject.name = "USB Serial Telnet Server"
+include ':app'