Styjun

I'm making an app which can write to firebase database on button click.
The app is working on emulator but it's not working on my physical device.
Here's the main activity code:

public class MainActivity extends AppCompatActivity {
private Firebase fled1;
Button on;
Button off;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Firebase.setAndroidContext(this);

 on= findViewById(R.id.on);
 off= findViewById(R.id.off);

 on.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 

 fled1 = new Firebase("https://iotapp-6y3n8.firebaseio.com/");
 Firebase fled1Child = fled1.child("S1");
 fled1Child.setValue("1");
 
 );

 off.setOnClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View view) 
 fled1 = new Firebase("https://iotapp-6y3n8.firebaseio.com/"); 
 Firebase fled1Child = fled1.child("S1");
 fled1Child.setValue("0");
 
 );
 

Here's my manifest file I have added all the permissions required:

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.lalitahuja.iotbutton">
 <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">
 <activity android:name="com.example.lalitahuja.iotbutton.MainActivity">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />
 </intent-filter>
 </activity>
 </application>

</manifest>

Here's the build Gradle file:

apply plugin: 'com.android.application'

android 
 compileSdkVersion 28
 defaultConfig 
 applicationId "com.example.lalitahuja.iotbutton"
 minSdkVersion 15
 targetSdkVersion 28
 versionCode 1
 versionName "1.0"
 testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
 
 buildTypes 
 release 
 minifyEnabled false
 proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
 
 


dependencies 
 implementation fileTree(dir: 'libs', include: ['*.jar'])
 //noinspection GradleCompatible
 implementation 'com.android.support:appcompat-v7:28.0.0'
 implementation 'com.android.support.constraint:constraint-layout:1.1.3'
 testImplementation 'junit:junit:4.12'
 androidTestImplementation 'com.android.support.test:runner:1.0.2'
 androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
 implementation 'com.google.firebase:firebase-core:16.0.8'
 implementation 'com.google.firebase:firebase-database:16.1.0'
 implementation 'com.crashlytics.sdk.android:crashlytics:2.9.7'
 implementation 'com.google.firebase:firebase-auth:16.2.0'
 implementation 'com.firebase:firebase-client-android:2.5.2'

apply plugin: 'com.google.gms.google-services'

The error I'm getting:

E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 1
E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 2
E/FirebaseInstanceId: Token retrieval failed: SERVICE_NOT_AVAILABLE
W/MessengerIpcClient: Timing out request: 3
W/MessengerIpcClient: Received response for unknown request: 3
E/FirebaseInstanceId: Failed to resolve target intent service, skipping classname enforcement
E/FirebaseInstanceId: Error while delivering the message: ServiceIntent not found.
W/MessengerIpcClient: Received response for unknown request: 1
W/MessengerIpcClient: Received response for unknown request: 2