Initial tests in order to introduce a centralized broker architecture

build.gradle

@@ -3,9 +3,22 @@ subprojects {
     mavenCentral()
   }
 }
+allprojects {
+    repositories {
+        mavenCentral()
+        jcenter()
+        maven {
+            url "https://maven.google.com"
+        }
+    }
+}
 buildscript {
     repositories {
         mavenCentral()
+        maven {
+            url 'https://maven.google.com/'
+            name 'Google'
+        }
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.0'

graphenej/build.gradle

@@ -11,6 +11,12 @@ dependencies {
     compile 'org.bitcoinj:bitcoinj-core:0.14.3'
     compile group: 'com.google.code.gson', name: 'gson', version: '2.8.0'
     compile group: "org.tukaani", name: "xz", version: "1.6"
+
+    //  Rx dependencies
+    compile 'io.reactivex.rxjava2:rxandroid:2.0.2'
+    compile 'io.reactivex.rxjava2:rxjava:2.1.9'
+    compile 'com.jakewharton.rxrelay2:rxrelay:2.0.0'
+    compile 'com.squareup.okhttp3:okhttp:3.5.0'
 }
 
 

graphenej/src/main/java/cy/agorise/graphenej/api/ConnectionStatusUpdate.java

@@ -0,0 +1,24 @@
+package cy.agorise.graphenej.api;
+
+/**
+ * Class used to send connection status updates
+ */
+
+public class ConnectionStatusUpdate {
+    public final static String CONNECTED = "Connected";
+    public final static String DISCONNECTED = "Disconnected";
+
+    private String connectionStatus;
+
+    public ConnectionStatusUpdate(String status){
+        this.connectionStatus = status;
+    }
+
+    public String getConnectionStatus() {
+        return connectionStatus;
+    }
+
+    public void setConnectionStatus(String connectionStatus) {
+        this.connectionStatus = connectionStatus;
+    }
+}

graphenej/src/main/java/cy/agorise/graphenej/api/android/RxBus.java

@@ -0,0 +1,36 @@
+package cy.agorise.graphenej.api.android;
+
+import com.jakewharton.rxrelay2.PublishRelay;
+import com.jakewharton.rxrelay2.Relay;
+
+import io.reactivex.BackpressureStrategy;
+import io.reactivex.Flowable;
+
+/**
+ * Explained here: https://blog.kaush.co/2014/12/24/implementing-an-event-bus-with-rxjava-rxbus/
+ */
+public class RxBus {
+
+    private static RxBus rxBus;
+
+    public static final RxBus getBusInstance(){
+        if(rxBus == null){
+            rxBus = new RxBus();
+        }
+        return rxBus;
+    }
+
+    private final Relay<Object> _bus = PublishRelay.create().toSerialized();
+
+    public void send(Object o) {
+        _bus.accept(o);
+    }
+
+    public Flowable<Object> asFlowable() {
+        return _bus.toFlowable(BackpressureStrategy.LATEST);
+    }
+
+    public boolean hasObservers() {
+        return _bus.hasObservers();
+    }
+}

graphenej/src/main/java/cy/agorise/graphenej/api/bitshares/Nodes.java

@@ -0,0 +1,15 @@
+package cy.agorise.graphenej.api.bitshares;
+
+/**
+ * Known public nodes
+ */
+
+public class Nodes {
+    public static final String[] NODE_URLS = {
+                "wss://bitshares.nus/ws",
+                "ws://echo.websocket.org",
+                "wss://dexnode.net/ws",                    // Dallas, USA
+                "wss://bitshares.crypto.fans/ws",          // Munich, Germany
+                "wss://bitshares.openledger.info/ws",      // Openledger node
+    };
+}

sample/.gitignore

@@ -0,0 +1 @@
+/build

sample/build.gradle

@@ -0,0 +1,41 @@
+apply plugin: 'com.android.application'
+
+android {
+    compileSdkVersion 26
+    buildToolsVersion "27.0.0"
+
+
+    defaultConfig {
+        applicationId "com.luminiasoft.labs.sample"
+        minSdkVersion 14
+        targetSdkVersion 26
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+        multiDexEnabled true
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+
+}
+
+dependencies {
+    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile project(':graphenej')
+    compile 'com.android.support:appcompat-v7:26.1.0'
+    compile 'com.android.support.constraint:constraint-layout:1.0.2'
+    compile 'com.jakewharton.rxbinding2:rxbinding:2.1.1'
+    compile 'com.jakewharton:butterknife:8.8.1'
+    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
+    testCompile 'junit:junit:4.12'
+    androidTestCompile('com.android.support.test.espresso:espresso-core:3.0.1', {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    })
+    compile 'com.android.support:multidex:1.0.1'
+}

sample/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

sample/src/androidTest/java/com/luminiasoft/labs/sample/ExampleInstrumentedTest.java

@@ -0,0 +1,26 @@
+package com.luminiasoft.labs.sample;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.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() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("com.luminiasoft.labs.sample", appContext.getPackageName());
+    }
+}

sample/src/main/AndroidManifest.xml

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.luminiasoft.labs.sample">
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <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"
+        android:name=".SampleApplication">
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+
+        <service android:name=".NetworkService" />
+
+        <activity android:name=".SecondActivity"></activity>
+    </application>
+
+</manifest>

sample/src/main/java/com/luminiasoft/labs/sample/MainActivity.java

@@ -0,0 +1,100 @@
+package com.luminiasoft.labs.sample;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.Bundle;
+import android.os.IBinder;
+import android.support.v7.app.AppCompatActivity;
+import android.util.Log;
+import android.view.View;
+import android.widget.TextView;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import butterknife.OnClick;
+import cy.agorise.graphenej.api.ConnectionStatusUpdate;
+import cy.agorise.graphenej.api.android.RxBus;
+import io.reactivex.android.schedulers.AndroidSchedulers;
+import io.reactivex.functions.Consumer;
+
+public class MainActivity extends AppCompatActivity {
+    private final String TAG = this.getClass().getName();
+
+    @BindView(R.id.connection_status)
+    TextView mConnectionStatus;
+
+    @BindView(R.id.response)
+    TextView mResponse;
+
+    // In case we want to interact directly with the service
+    private NetworkService mService;
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+        ButterKnife.bind(this);
+
+        RxBus.getBusInstance()
+            .asFlowable()
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe(new Consumer<Object>() {
+
+            @Override
+            public void accept(Object o) throws Exception {
+                if(o instanceof String){
+                    Log.d(TAG,"Got message");
+                    mResponse.setText(mResponse.getText() + ((String)o) + "\n");
+                }else if(o instanceof ConnectionStatusUpdate){
+                    Log.d(TAG,"Got connection update");
+                    mConnectionStatus.setText(((ConnectionStatusUpdate)o).getConnectionStatus());
+                }
+            }
+        });
+    }
+
+    @OnClick(R.id.send_message)
+    public void onSendMesage(View v){
+        mService.sendMessage("Sample message");
+    }
+
+    @OnClick(R.id.next_activity)
+    public void onNextActivity(View v){
+        Intent intent = new Intent(this, SecondActivity.class);
+        startActivity(intent);
+    }
+
+    @Override
+    protected void onStart() {
+        super.onStart();
+        // Bind to LocalService
+        Intent intent = new Intent(this, NetworkService.class);
+        bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        unbindService(mConnection);
+    }
+
+    /** Defines callbacks for backend binding, passed to bindService() */
+    private ServiceConnection mConnection = new ServiceConnection() {
+
+        @Override
+        public void onServiceConnected(ComponentName className,
+                                       IBinder service) {
+            Log.d(TAG,"onServiceConnected");
+            // We've bound to LocalService, cast the IBinder and get LocalService instance
+            NetworkService.LocalBinder binder = (NetworkService.LocalBinder) service;
+            mService = binder.getService();
+        }
+
+        @Override
+        public void onServiceDisconnected(ComponentName componentName) {
+            Log.d(TAG,"onServiceDisconnected");
+        }
+    };
+}

sample/src/main/java/com/luminiasoft/labs/sample/NetworkService.java

@@ -0,0 +1,119 @@
+package com.luminiasoft.labs.sample;
+
+import android.app.Service;
+import android.content.Intent;
+import android.os.Binder;
+import android.os.IBinder;
+import android.support.annotation.Nullable;
+import android.util.Log;
+
+import cy.agorise.graphenej.api.ConnectionStatusUpdate;
+import cy.agorise.graphenej.api.android.RxBus;
+import cy.agorise.graphenej.api.bitshares.Nodes;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import okhttp3.WebSocket;
+import okhttp3.WebSocketListener;
+
+/**
+ * Service in charge of mantaining a connection to the full node.
+ */
+
+public class NetworkService extends Service {
+    private final String TAG = this.getClass().getName();
+
+    private static final int NORMAL_CLOSURE_STATUS = 1000;
+
+    private final IBinder mBinder = new LocalBinder();
+
+    private WebSocket mWebSocket;
+
+    private int mSocketIndex;
+
+    private WebSocketListener mWebSocketListener = new WebSocketListener() {
+
+        @Override
+        public void onOpen(WebSocket webSocket, Response response) {
+            super.onOpen(webSocket, response);
+            mWebSocket = webSocket;
+            RxBus.getBusInstance().send(new ConnectionStatusUpdate(ConnectionStatusUpdate.CONNECTED));
+        }
+
+        @Override
+        public void onMessage(WebSocket webSocket, String text) {
+            super.onMessage(webSocket, text);
+            Log.d(TAG,"onMessage. text: "+text);
+            RxBus.getBusInstance().send(text);
+        }
+
+        @Override
+        public void onClosed(WebSocket webSocket, int code, String reason) {
+            super.onClosed(webSocket, code, reason);
+            Log.d(TAG,"onClosed");
+            RxBus.getBusInstance().send(new ConnectionStatusUpdate(ConnectionStatusUpdate.DISCONNECTED));
+        }
+
+        @Override
+        public void onFailure(WebSocket webSocket, Throwable t, Response response) {
+            super.onFailure(webSocket, t, response);
+            Log.d(TAG,"onFailure. Msg: "+t.getMessage());
+            RxBus.getBusInstance().send(new ConnectionStatusUpdate(ConnectionStatusUpdate.DISCONNECTED));
+            mSocketIndex++;
+            connect();
+        }
+    };
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Log.d(TAG,"onCreate");
+        connect();
+    }
+
+    private void connect(){
+        OkHttpClient client = new OkHttpClient();
+        String url = Nodes.NODE_URLS[mSocketIndex % Nodes.NODE_URLS.length];
+        Request request = new Request.Builder().url(url).build();
+        client.newWebSocket(request, mWebSocketListener);
+    }
+
+    public void sendMessage(String message){
+        if(mWebSocket.send(message)){
+            Log.d(TAG,"Message enqueued");
+        }else{
+            Log.w(TAG,"Message not enqueued");
+        }
+    }
+
+
+    @Override
+    public void onDestroy() {
+        Log.d(TAG,"onDestroy");
+        mWebSocket.close(NORMAL_CLOSURE_STATUS, null);
+    }
+
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+        Log.d(TAG,"onStartCommand");
+        return super.onStartCommand(intent, flags, startId);
+    }
+
+    @Nullable
+    @Override
+    public IBinder onBind(Intent intent) {
+        Log.d(TAG,"onBind");
+        return mBinder;
+    }
+
+    /**
+     * Class used for the client Binder.  Because we know this service always
+     * runs in the same process as its clients, we don't need to deal with IPC.
+     */
+    public class LocalBinder extends Binder {
+        public NetworkService getService() {
+            // Return this instance of LocalService so clients can call public methods
+            return NetworkService.this;
+        }
+    }
+}

sample/src/main/java/com/luminiasoft/labs/sample/SampleApplication.java

@@ -0,0 +1,89 @@
+package com.luminiasoft.labs.sample;
+
+import android.app.Activity;
+import android.app.Application;
+import android.content.Intent;
+import android.os.Bundle;
+import android.os.Handler;
+import android.util.Log;
+
+/**
+ * Sample application class
+ */
+
+public class SampleApplication extends Application implements Application.ActivityLifecycleCallbacks {
+    private final String TAG = this.getClass().getName();
+
+    /**
+     * Handler instance used to schedule tasks back to the main thread
+     */
+    private Handler mHandler = new Handler();
+
+    /**
+     * Constant used to specify how long will the app wait for another activity to go through its starting life
+     * cycle events before running the teardownConnectionTask task.
+     *
+     * This is used as a means to detect whether or not the user has left the app.
+     */
+    private final int DISCONNECT_DELAY = 1500;
+
+    /**
+     * Runnable used to schedule a service disconnection once the app is not visible to the user for
+     * more than DISCONNECT_DELAY milliseconds.
+     */
+    private final Runnable mDisconnectRunnable = new Runnable() {
+        @Override
+        public void run() {
+            Log.d(TAG,"Runing stopService");
+            stopService(new Intent(getApplicationContext(), NetworkService.class));
+        }
+    };
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        Intent intent = new Intent(this, NetworkService.class);
+        startService(intent);
+
+        /*
+        * Registering this class as a listener to all activity's callback cycle events, in order to
+        * better estimate when the user has left the app and it is safe to disconnect the websocket connection
+        */
+        registerActivityLifecycleCallbacks(this);
+    }
+
+    @Override
+    public void onActivityCreated(Activity activity, Bundle bundle) {
+
+    }
+
+    @Override
+    public void onActivityStarted(Activity activity) {
+        mHandler.removeCallbacks(mDisconnectRunnable);
+    }
+
+    @Override
+    public void onActivityResumed(Activity activity) {
+
+    }
+
+    @Override
+    public void onActivityPaused(Activity activity) {
+        mHandler.postDelayed(mDisconnectRunnable, DISCONNECT_DELAY);
+    }
+
+    @Override
+    public void onActivityStopped(Activity activity) {
+
+    }
+
+    @Override
+    public void onActivitySaveInstanceState(Activity activity, Bundle bundle) {
+
+    }
+
+    @Override
+    public void onActivityDestroyed(Activity activity) {
+
+    }
+}

sample/src/main/java/com/luminiasoft/labs/sample/SecondActivity.java

@@ -0,0 +1,13 @@
+package com.luminiasoft.labs.sample;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+
+public class SecondActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_second);
+    }
+}

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

@@ -0,0 +1,34 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillType="evenOdd"
+        android:pathData="M32,64C32,64 38.39,52.99 44.13,50.95C51.37,48.37 70.14,49.57 70.14,49.57L108.26,87.69L108,109.01L75.97,107.97L32,64Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="78.5885"
+                android:endY="90.9159"
+                android:startX="48.7653"
+                android:startY="61.0927"
+                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="M66.94,46.02L66.94,46.02C72.44,50.07 76,56.61 76,64L32,64C32,56.61 35.56,50.11 40.98,46.06L36.18,41.19C35.45,40.45 35.45,39.3 36.18,38.56C36.91,37.81 38.05,37.81 38.78,38.56L44.25,44.05C47.18,42.57 50.48,41.71 54,41.71C57.48,41.71 60.78,42.57 63.68,44.05L69.11,38.56C69.84,37.81 70.98,37.81 71.71,38.56C72.44,39.3 72.44,40.45 71.71,41.19L66.94,46.02ZM62.94,56.92C64.08,56.92 65,56.01 65,54.88C65,53.76 64.08,52.85 62.94,52.85C61.8,52.85 60.88,53.76 60.88,54.88C60.88,56.01 61.8,56.92 62.94,56.92ZM45.06,56.92C46.2,56.92 47.13,56.01 47.13,54.88C47.13,53.76 46.2,52.85 45.06,52.85C43.92,52.85 43,53.76 43,54.88C43,56.01 43.92,56.92 45.06,56.92Z"
+        android:strokeColor="#00000000"
+        android:strokeWidth="1" />
+</vector>

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

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportHeight="108"
+    android:viewportWidth="108">
+    <path
+        android:fillColor="#26A69A"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeColor="#33FFFFFF"
+        android:strokeWidth="0.8" />
+</vector>

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

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.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="com.luminiasoft.labs.sample.MainActivity">
+    <Button
+        android:id="@+id/send_message"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Send message"
+        app:layout_constraintBottom_toTopOf="@+id/response"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <TextView
+        android:id="@+id/response"
+        android:layout_width="match_parent"
+        android:layout_height="200dp"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/send_message"
+        app:layout_constraintBottom_toTopOf="@+id/next_activity"/>
+
+    <Button
+        android:id="@+id/next_activity"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Next activity"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/response" />
+
+    <TextView
+        android:id="@+id/connection_status"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginBottom="8dp"
+        android:gravity="center"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

sample/src/main/res/layout/activity_second.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.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="com.luminiasoft.labs.sample.SecondActivity">
+
+</android.support.constraint.ConstraintLayout>

sample/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="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

sample/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="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

sample/src/main/res/values/colors.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

sample/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">Sample</string>
+</resources>

sample/src/main/res/values/styles.xml

@@ -0,0 +1,11 @@
+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
+        <item name="colorAccent">@color/colorAccent</item>
+    </style>
+
+</resources>

sample/src/test/java/com/luminiasoft/labs/sample/ExampleUnitTest.java

@@ -0,0 +1,17 @@
+package com.luminiasoft.labs.sample;
+
+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() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}

settings.gradle

@@ -1,3 +1,4 @@
+include ':sample'
 rootProject.name = "Graphenej"
 
 include ":graphenej"