php - Firebase Messaging service not working sometimes -

i'm developing taxi booking application using android & im new firebase. developed 2 android application using firebase message service. create 2 firebase apps in same firebase project @ firebase concole & use 2 keys 2 android modules(passenger module & driver module).

1. passenger app/module. (device a)
2. driver app/module. (device b)
3. php application on server handle requests.

i need send firebase message device device b. application work fine. sometimes, didn't receive firebase message to, onmessagereceived(remotemessage remotemessage) method on device b. success json array server device a, {"multicast_id":4784526898355206621,"success":1,"failure":0,"canonical_ids":0,"results":[{"message_id":"0:1503395492396343%2f40e632f9fd7ecd"}]}

what doing wrong? please me resolve issue.

these related files used in 2 apps.

androidmenifest.xml - passenger application (device a)

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.cdc.passenger">  <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:supportsrtl="true"     android:theme="@style/apptheme">      <activity         ...     />      ...      <meta-data         android:name="com.google.android.geo.api_key"         android:value="aiza......................................................" />      <!-- services -->     <service android:name="com.cdc.passenger.myfirebasemessagingservice"         android:enabled="true"         android:exported="true">         <intent-filter>             <action android:name="com.google.firebase.messaging_event" />         </intent-filter>     </service>     <service android:name="com.cdc.passenger.myfirebaseinstanceidservice">         <intent-filter>             <action android:name="com.google.firebase.instance_id_event" />         </intent-filter>     </service> </application> </manifest> 

androidmenifest.xml - driver application (device b)

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.cdc.driver">  <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:screenorientation="portrait"     android:supportsrtl="true"     android:theme="@style/apptheme">      <activity         ...     />      ...      <service android:name="com.cdc.driver.driver.myfirebasemessagingservice"         android:enabled="true"         android:exported="true">         <intent-filter>             <action android:name="com.google.firebase.messaging_event" />         </intent-filter>     </service>     <service android:name="com.cdc.driver.driver.myfirebaseinstanceidservice">         <intent-filter>             <action android:name="com.google.firebase.instance_id_event" />         </intent-filter>     </service>      <meta-data         android:name="com.google.android.geo.api_key"         android:value="aiza.........................................................................." />  </application> </manifest> 

buildgradle - project scope

dependencies {     classpath 'com.android.tools.build:gradle:2.1.0'     classpath 'com.google.gms:google-services:3.1.0' } 

buildgradle - passenger module

apply plugin: 'com.android.application'      android {         compilesdkversion 24         buildtoolsversion "24.0.1"         defaultconfig {             applicationid "com.cdc.passenger"             minsdkversion 17             targetsdkversion 24             versioncode 21             versionname '1.9'         }          ...     }      dependencies {         //    compile filetree(dir: 'libs', include: ['*.jar'])         compile files('libs/commons-net-3.4.jar')         testcompile 'junit:junit:4.12'         compile 'com.android.support:appcompat-v7:24.1.1'         compile 'com.android.support:support-v4:24.1.1'         compile 'com.android.support:design:24.1.1'         compile 'com.android.support:cardview-v7:24.1.1'         compile 'com.android.support:recyclerview-v7:24.1.1'         compile 'com.google.firebase:firebase-core:9.4.0'         compile 'com.google.firebase:firebase-messaging:9.4.0'     }      repositories{        ...     }   apply plugin: 'com.google.gms.google-services' 

buildgradle - driver module

apply plugin: 'com.android.application'  android {     compilesdkversion 24     buildtoolsversion "24.0.1"     defaultconfig {         applicationid "com.cdc.driver"         minsdkversion 17         targetsdkversion 24         versioncode 5         versionname '1.4'     }      ... }  dependencies {     //    compile filetree(dir: 'libs', include: ['*.jar'])     compile files('libs/commons-net-3.4.jar')     testcompile 'junit:junit:4.12'     compile 'com.android.support:appcompat-v7:24.1.1'     compile 'com.android.support:support-v4:24.1.1'     compile 'com.android.support:design:24.1.1'     compile 'com.android.support:cardview-v7:24.1.1'     compile 'com.google.firebase:firebase-core:9.4.0'     compile 'com.google.firebase:firebase-messaging:9.4.0'     compile 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1' }  repositories{     ... }  apply plugin: 'com.google.gms.google-services' 

server-side code

$fields = array(         'registration_ids' => array($token),         'priority' => 'high',         'time_to_live' => 5,         'data' => array("ride" => $rideid, "pickup" => $pickup)     );      $headers = array(         'authorization:key=' . applicationcontroller::$api_key,         'content-type: application/json'     );       $ch = curl_init();     curl_setopt($ch, curlopt_url, 'https://fcm.googleapis.com/fcm/send');     curl_setopt($ch, curlopt_post, true);     curl_setopt($ch, curlopt_httpheader, $headers);     curl_setopt($ch, curlopt_returntransfer, true);     curl_setopt($ch, curlopt_ssl_verifyhost, 0);     curl_setopt($ch, curlopt_ssl_verifypeer, false);     curl_setopt($ch, curlopt_postfields, json_encode($fields));      $result = curl_exec($ch);     if ($result === false) {         die('curl failed: ' . curl_error($ch));     }     curl_close($ch);  echo $result; 

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