Init repo

.gitignore

+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

.idea/.gitignore

+# Default ignored files
+/shelf/
+/workspace.xml

.idea/compiler.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="11" />
+  </component>
+</project>
\ No newline at end of file

.idea/gradle.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="testRunner" value="GRADLE" />
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+            <option value="$PROJECT_DIR$/app" />
+          </set>
+        </option>
+        <option name="resolveModulePerSourceSet" value="false" />
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file

.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="DesignSurface">
+    <option name="filePathToZoomLevelMap">
+      <map>
+        <entry key="..\:/Users/vikto/AndroidStudioProjects/BluetoothControl/app/src/main/res/drawable/ic_bulb_light.xml" value="0.14635416666666667" />
+        <entry key="..\:/Users/vikto/AndroidStudioProjects/BluetoothControl/app/src/main/res/drawable/ic_launcher_background.xml" value="0.14635416666666667" />
+        <entry key="..\:/Users/vikto/AndroidStudioProjects/BluetoothControl/app/src/main/res/layout/activity_main.xml" value="0.264" />
+        <entry key="..\:/Users/vikto/AndroidStudioProjects/BluetoothControl/app/src/main/res/layout/activity_select_device.xml" value="0.1793478260869565" />
+        <entry key="..\:/Users/vikto/AndroidStudioProjects/BluetoothControl/app/src/main/res/layout/device_info_layout.xml" value="0.1793478260869565" />
+      </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

app/.gitignore

+/build
\ No newline at end of file

app/build.gradle

+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "se.liu.vikro145.bluetoothcontrol"
+        minSdk 21
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'com.google.android.material:material:1.4.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
+}
\ No newline at end of file

app/proguard-rules.pro

+# 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

app/src/androidTest/java/se/liu/vikro145/bluetoothcontrol/ExampleInstrumentedTest.java

+package se.liu.vikro145.bluetoothcontrol;
+
+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("se.liu.vikro145.bluetoothcontrol", appContext.getPackageName());
+    }
+}
\ No newline at end of file

app/src/main/AndroidManifest.xml

+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="se.liu.vikro145.bluetoothcontrol">
+
+    <!--Permissions for Bluetooth access-->
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+
+    <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/AppTheme">
+        <activity android:name=".SelectDeviceActivity"></activity>
+        <activity android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>
\ No newline at end of file

app/src/main/java/se/liu/vikro145/bluetoothcontrol/DeviceInfoModel.java

+package se.liu.vikro145.bluetoothcontrol;
+
+public class DeviceInfoModel {
+
+    private String deviceName, deviceHardwareAddress;
+
+    public DeviceInfoModel(){}
+
+    public DeviceInfoModel(String deviceName, String deviceHardwareAddress){
+        this.deviceName = deviceName;
+        this.deviceHardwareAddress = deviceHardwareAddress;
+    }
+
+    public String getDeviceName(){return deviceName;}
+
+    public String getDeviceHardwareAddress(){return deviceHardwareAddress;}
+
+}
\ No newline at end of file

app/src/main/java/se/liu/vikro145/bluetoothcontrol/DeviceListAdapter.java

+package se.liu.vikro145.bluetoothcontrol;
+
+import android.content.Intent;
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.LinearLayout;
+import android.widget.TextView;
+
+import androidx.recyclerview.widget.RecyclerView;
+
+import java.util.List;
+
+public class DeviceListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+
+    private Context context;
+    private List<Object> deviceList;
+
+    public static class ViewHolder extends RecyclerView.ViewHolder {
+        TextView textName, textAddress;
+        LinearLayout linearLayout;
+
+        public ViewHolder(View v) {
+            super(v);
+            textName = v.findViewById(R.id.textViewDeviceName);
+            textAddress = v.findViewById(R.id.textViewDeviceAddress);
+            linearLayout = v.findViewById(R.id.linearLayoutDeviceInfo);
+        }
+    }
+
+    public DeviceListAdapter(Context context, List<Object> deviceList) {
+        this.context = context;
+        this.deviceList = deviceList;
+
+    }
+
+    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+        View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.device_info_layout, parent, false);
+        ViewHolder vh = new ViewHolder(v);
+        return vh;
+    }
+
+    @Override
+    public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
+        ViewHolder itemHolder = (ViewHolder) holder;
+        final DeviceInfoModel deviceInfoModel = (DeviceInfoModel) deviceList.get(position);
+        itemHolder.textName.setText(deviceInfoModel.getDeviceName());
+        itemHolder.textAddress.setText(deviceInfoModel.getDeviceHardwareAddress());
+
+        // When a device is selected
+        itemHolder.linearLayout.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Intent intent = new Intent(context,MainActivity.class);
+                // Send device details to the MainActivity
+                intent.putExtra("deviceName", deviceInfoModel.getDeviceName());
+                intent.putExtra("deviceAddress",deviceInfoModel.getDeviceHardwareAddress());
+                // Call MainActivity
+                context.startActivity(intent);
+
+            }
+        });
+    }
+
+    @Override
+    public int getItemCount() {
+        int dataCount = deviceList.size();
+        return dataCount;
+    }
+}
\ No newline at end of file

app/src/main/java/se/liu/vikro145/bluetoothcontrol/MainActivity.java

+package se.liu.vikro145.bluetoothcontrol;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.widget.Toolbar;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothSocket;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.Looper;
+import android.os.Message;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.ProgressBar;
+import android.widget.TextView;
+
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.UUID;
+
+import static android.content.ContentValues.TAG;
+
+public class MainActivity extends AppCompatActivity {
+
+    private String deviceName = null;
+    private String deviceAddress;
+    public static Handler handler;
+    public static BluetoothSocket mmSocket;
+    public static ConnectedThread connectedThread;
+    public static CreateConnectThread createConnectThread;
+
+    private final static int CONNECTING_STATUS = 1; // used in bluetooth handler to identify message status
+    private final static int MESSAGE_READ = 2; // used in bluetooth handler to identify message update
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        // UI Initialization
+        final Button buttonConnect = findViewById(R.id.buttonConnect);
+        final Toolbar toolbar = findViewById(R.id.toolbar);
+        final ProgressBar progressBar = findViewById(R.id.progressBar);
+        progressBar.setVisibility(View.GONE);
+        final TextView textViewInfo = findViewById(R.id.textViewInfo);
+        final Button buttonToggle = findViewById(R.id.buttonToggle);
+        buttonToggle.setEnabled(false);
+        final ImageView imageView = findViewById(R.id.imageView);
+        imageView.setBackgroundColor(getResources().getColor(R.color.colorOff));
+
+        // If a bluetooth device has been selected from SelectDeviceActivity
+        deviceName = getIntent().getStringExtra("deviceName");
+        if (deviceName != null){
+            // Get the device address to make BT Connection
+            deviceAddress = getIntent().getStringExtra("deviceAddress");
+            // Show progree and connection status
+            toolbar.setSubtitle("Connecting to " + deviceName + "...");
+            progressBar.setVisibility(View.VISIBLE);
+            buttonConnect.setEnabled(false);
+
+            /*
+            This is the most important piece of code. When "deviceName" is found
+            the code will call a new thread to create a bluetooth connection to the
+            selected device (see the thread code below)
+             */
+            BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+            createConnectThread = new CreateConnectThread(bluetoothAdapter,deviceAddress);
+            createConnectThread.start();
+        }
+
+        /*
+        Second most important piece of Code. GUI Handler
+         */
+        handler = new Handler(Looper.getMainLooper()) {
+            @Override
+            public void handleMessage(Message msg){
+                switch (msg.what){
+                    case CONNECTING_STATUS:
+                        switch(msg.arg1){
+                            case 1:
+                                toolbar.setSubtitle("Connected to " + deviceName);
+                                progressBar.setVisibility(View.GONE);
+                                buttonConnect.setEnabled(true);
+                                buttonToggle.setEnabled(true);
+                                break;
+                            case -1:
+                                toolbar.setSubtitle("Device fails to connect");
+                                progressBar.setVisibility(View.GONE);
+                                buttonConnect.setEnabled(true);
+                                break;
+                        }
+                        break;
+
+                    case MESSAGE_READ:
+                        String arduinoMsg = msg.obj.toString(); // Read message from Arduino
+                        switch (arduinoMsg.toLowerCase()){
+                            case "led is turned on":
+                                imageView.setBackgroundColor(getResources().getColor(R.color.colorOn));
+                                textViewInfo.setText("Arduino Message : " + arduinoMsg);
+                                break;
+                            case "led is turned off":
+                                imageView.setBackgroundColor(getResources().getColor(R.color.colorOff));
+                                textViewInfo.setText("Arduino Message : " + arduinoMsg);
+                                break;
+                        }
+                        break;
+                }
+            }
+        };
+
+        // Select Bluetooth Device
+        buttonConnect.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                // Move to adapter list
+                Intent intent = new Intent(MainActivity.this, SelectDeviceActivity.class);
+                startActivity(intent);
+            }
+        });
+
+        // Button to ON/OFF LED on Arduino Board
+        buttonToggle.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                String cmdText = null;
+                String btnState = buttonToggle.getText().toString().toLowerCase();
+                switch (btnState){
+                    case "turn on":
+                        buttonToggle.setText("Turn Off");
+                        // Command to turn on LED on Arduino. Must match with the command in Arduino code
+                        cmdText = "<turn on>";
+                        break;
+                    case "turn off":
+                        buttonToggle.setText("Turn On");
+                        // Command to turn off LED on Arduino. Must match with the command in Arduino code
+                        cmdText = "<turn off>";
+                        break;
+                }
+                // Send command to Arduino board
+                connectedThread.write(cmdText);
+            }
+        });
+    }
+
+    /* ============================ Thread to Create Bluetooth Connection =================================== */
+    public static class CreateConnectThread extends Thread {
+
+        public CreateConnectThread(BluetoothAdapter bluetoothAdapter, String address) {
+            /*
+            Use a temporary object that is later assigned to mmSocket
+            because mmSocket is final.
+             */
+            BluetoothDevice bluetoothDevice = bluetoothAdapter.getRemoteDevice(address);
+            BluetoothSocket tmp = null;
+            UUID uuid = bluetoothDevice.getUuids()[0].getUuid();
+
+            try {
+                /*
+                Get a BluetoothSocket to connect with the given BluetoothDevice.
+                Due to Android device varieties,the method below may not work fo different devices.
+                You should try using other methods i.e. :
+                tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
+                 */
+                tmp = bluetoothDevice.createInsecureRfcommSocketToServiceRecord(uuid);
+
+            } catch (IOException e) {
+                Log.e(TAG, "Socket's create() method failed", e);
+            }
+            mmSocket = tmp;
+        }
+
+        public void run() {
+            // Cancel discovery because it otherwise slows down the connection.
+            BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+            bluetoothAdapter.cancelDiscovery();
+            try {
+                // Connect to the remote device through the socket. This call blocks
+                // until it succeeds or throws an exception.
+                mmSocket.connect();
+                Log.e("Status", "Device connected");
+                handler.obtainMessage(CONNECTING_STATUS, 1, -1).sendToTarget();
+            } catch (IOException connectException) {
+                // Unable to connect; close the socket and return.
+                try {
+                    mmSocket.close();
+                    Log.e("Status", "Cannot connect to device");
+                    handler.obtainMessage(CONNECTING_STATUS, -1, -1).sendToTarget();
+                } catch (IOException closeException) {
+                    Log.e(TAG, "Could not close the client socket", closeException);
+                }
+                return;
+            }
+
+            // The connection attempt succeeded. Perform work associated with
+            // the connection in a separate thread.
+            connectedThread = new ConnectedThread(mmSocket);
+            connectedThread.run();
+        }
+
+        // Closes the client socket and causes the thread to finish.
+        public void cancel() {
+            try {
+                mmSocket.close();
+            } catch (IOException e) {
+                Log.e(TAG, "Could not close the client socket", e);
+            }
+        }
+    }
+
+    /* =============================== Thread for Data Transfer =========================================== */
+    public static class ConnectedThread extends Thread {
+        private final BluetoothSocket mmSocket;
+        private final InputStream mmInStream;
+        private final OutputStream mmOutStream;
+
+        public ConnectedThread(BluetoothSocket socket) {
+            mmSocket = socket;
+            InputStream tmpIn = null;
+            OutputStream tmpOut = null;
+
+            // Get the input and output streams, using temp objects because
+            // member streams are final
+            try {
+                tmpIn = socket.getInputStream();
+                tmpOut = socket.getOutputStream();
+            } catch (IOException e) { }
+
+            mmInStream = tmpIn;
+            mmOutStream = tmpOut;
+        }
+
+        public void run() {
+            byte[] buffer = new byte[1024];  // buffer store for the stream
+            int bytes = 0; // bytes returned from read()
+            // Keep listening to the InputStream until an exception occurs
+            while (true) {
+                try {
+                    /*
+                    Read from the InputStream from Arduino until termination character is reached.
+                    Then send the whole String message to GUI Handler.
+                     */
+                    buffer[bytes] = (byte) mmInStream.read();
+                    String readMessage;
+                    if (buffer[bytes] == '\n'){
+                        readMessage = new String(buffer,0,bytes);
+                        Log.e("Arduino Message",readMessage);
+                        handler.obtainMessage(MESSAGE_READ,readMessage).sendToTarget();
+                        bytes = 0;
+                    } else {
+                        bytes++;
+                    }
+                } catch (IOException e) {
+                    e.printStackTrace();
+                    break;
+                }
+            }
+        }
+
+        /* Call this from the main activity to send data to the remote device */
+        public void write(String input) {
+            byte[] bytes = input.getBytes(); //converts entered String into bytes
+            try {
+                mmOutStream.write(bytes);
+            } catch (IOException e) {
+                Log.e("Send Error","Unable to send message",e);
+            }
+        }
+
+        /* Call this from the main activity to shutdown the connection */
+        public void cancel() {
+            try {
+                mmSocket.close();
+            } catch (IOException e) { }
+        }
+    }
+
+    /* ============================ Terminate Connection at BackPress ====================== */
+    @Override
+    public void onBackPressed() {
+        // Terminate Bluetooth Connection and close app
+        if (createConnectThread != null){
+            createConnectThread.cancel();
+        }
+        Intent a = new Intent(Intent.ACTION_MAIN);
+        a.addCategory(Intent.CATEGORY_HOME);
+        a.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+        startActivity(a);
+    }
+}
\ No newline at end of file

app/src/main/java/se/liu/vikro145/bluetoothcontrol/SelectDeviceActivity.java

+package se.liu.vikro145.bluetoothcontrol;
+
+import androidx.appcompat.app.AppCompatActivity;
+import androidx.recyclerview.widget.DefaultItemAnimator;
+import androidx.recyclerview.widget.LinearLayoutManager;
+import androidx.recyclerview.widget.RecyclerView;
+
+import android.bluetooth.BluetoothAdapter;
+import android.bluetooth.BluetoothDevice;
+import android.os.Bundle;
+import android.view.View;
+
+import com.google.android.material.snackbar.Snackbar;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+public class SelectDeviceActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_select_device);
+
+        // Bluetooth Setup
+        BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
+
+        // Get List of Paired Bluetooth Device
+        Set<BluetoothDevice> pairedDevices = bluetoothAdapter.getBondedDevices();
+        List<Object> deviceList = new ArrayList<>();
+
+        if (!pairedDevices.isEmpty()) {
+            // There are paired devices. Get the name and address of each paired device.
+            for (BluetoothDevice device : pairedDevices) {
+                String deviceName = device.getName();
+                String deviceHardwareAddress = device.getAddress(); // MAC address
+                DeviceInfoModel deviceInfoModel = new DeviceInfoModel(deviceName,deviceHardwareAddress);
+
+                deviceList.add(deviceInfoModel);
+            }
+
+            // Display paired device using recyclerView
+            RecyclerView recyclerView = findViewById(R.id.recyclerViewDevice);
+            recyclerView.setLayoutManager(new LinearLayoutManager(this));
+            DeviceListAdapter deviceListAdapter = new DeviceListAdapter(this,deviceList);
+            recyclerView.setAdapter(deviceListAdapter);
+            recyclerView.setItemAnimator(new DefaultItemAnimator());
+        } else {
+            View view = findViewById(R.id.recyclerViewDevice);
+            Snackbar snackbar = Snackbar.make(view, "Activate Bluetooth or pair a Bluetooth device", Snackbar.LENGTH_INDEFINITE);
+            snackbar.setAction("OK", new View.OnClickListener() {
+                @Override
+                public void onClick(View view) { }
+            });
+            snackbar.show();
+        }
+
+    }
+}
\ No newline at end of file

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>
\ No newline at end of file

app/src/main/res/drawable/ic_bulb_light.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24"
+    android:tint="#333333"
+    android:alpha="0.6">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M9,21c0,0.55 0.45,1 1,1h4c0.55,0 1,-0.45 1,-1v-1L9,20v1zM12,2C8.14,2 5,5.14 5,9c0,2.38 1.19,4.47 3,5.74L8,17c0,0.55 0.45,1 1,1h6c0.55,0 1,-0.45 1,-1v-2.26c1.81,-1.27 3,-3.36 3,-5.74 0,-3.86 -3.14,-7 -7,-7zM14.85,13.1l-0.85,0.6L14,16h-4v-2.3l-0.85,-0.6C7.8,12.16 7,10.63 7,9c0,-2.76 2.24,-5 5,-5s5,2.24 5,5c0,1.63 -0.8,3.16 -2.15,4.1z"/>
+</vector>
\ No newline at end of file

app/src/main/res/drawable/ic_launcher_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

app/src/main/res/layout/activity_main.xml

+<?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:id="@+id/constrainLayout"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@android:color/background_light"
+    tools:context=".MainActivity">
+
+    <androidx.appcompat.widget.Toolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:background="?attr/colorPrimary"
+        android:minHeight="?attr/actionBarSize"
+        android:theme="?attr/actionBarTheme"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:subtitleTextColor="@android:color/background_light"
+        app:title="Bluetooth Connection"
+        app:titleTextColor="@android:color/background_light" />
+
+    <ImageView
+        android:id="@+id/imageView"
+        android:layout_width="200dp"
+        android:layout_height="300dp"
+        android:layout_marginTop="24dp"
+        android:background="@color/colorOff"
+        android:contentDescription="Visual LED"
+        android:scaleType="centerCrop"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/toolbar"
+        app:srcCompat="@drawable/ic_bulb_light"
+        tools:ignore="VectorDrawableCompat" />
+
+    <Button
+        android:id="@+id/buttonConnect"
+        style="@style/Widget.AppCompat.Button.Borderless"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Connect"
+        android:textColor="@android:color/background_light"
+        app:layout_constraintBottom_toBottomOf="@+id/toolbar"
+        app:layout_constraintEnd_toEndOf="@+id/toolbar"
+        app:layout_constraintTop_toTopOf="@+id/toolbar" />
+
+    <Button
+        android:id="@+id/buttonToggle"
+        style="@style/Widget.AppCompat.Button.Colored"
+        android:layout_width="200dp"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="400dp"
+        android:text="Turn On"
+        android:textSize="24sp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <ProgressBar
+        android:id="@+id/progressBar"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/textViewInfo"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:textAlignment="center"
+        android:textStyle="italic"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.5"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/buttonToggle" />
+
+
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/layout/activity_select_device.xml

+<?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"
+    tools:context=".SelectDeviceActivity">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/recyclerViewDevice"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file

app/src/main/res/layout/device_info_layout.xml

+<?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="wrap_content">
+
+    <LinearLayout
+        android:id="@+id/linearLayoutDeviceInfo"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:orientation="vertical"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <TextView
+            android:id="@+id/textViewDeviceName"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:textSize="18sp"
+            android:textStyle="bold" />
+
+        <TextView
+            android:id="@+id/textViewDeviceAddress"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content" />
+    </LinearLayout>
+
+    <View
+        android:id="@+id/divider"
+        android:layout_width="0dp"
+        android:layout_height="1dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp"
+        android:background="?android:attr/listDivider"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/linearLayoutDeviceInfo" />
+</androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file