Does Firebase Cloud Messaging Support Voip Pushkit Services

Does Firebase Cloud Messaging support VOIP pushkit services?

At time of writing (FirebaseMessaging 1.1.0/Firebase 3.2.0) FCM uses regular APNs underneath on iOS, so there isn't support for PushKit notifications.

Is there any way to receive notification through Push Kit?

FCM does not support silent push notification.

Does Firebase Cloud Messaging support VOIP pushkit services?

You can try using below php file and terminal command.

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Php file

<?php

// Put your device token here (without spaces):

$deviceToken = '1234567890123456789';
//

// Put your private key's passphrase here:
$passphrase = 'ProjectName';

// Put your alert message here:
$message = 'My first silent push notification!';

$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'local_cert', 'PemFileName.pem');
stream_context_set_option($ctx, 'ssl', 'passphrase', $passphrase);

// Open a connection to the APNS server
$fp = stream_socket_client(
//  'ssl://gateway.push.apple.com:2195', $err,
'ssl://gateway.sandbox.push.apple.com:2195', $err,
$errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);

if (!$fp)
exit("Failed to connect: $err $errstr" . PHP_EOL);

echo 'Connected to APNS' . PHP_EOL;

// Create the payload body

$body['aps'] = array(
'content-available'=> 1,
'alert' => $message,
'sound' => 'default',
'badge' => 0,
);

// Encode the payload as JSON

$payload = json_encode($body);

// Build the binary notification
$msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;

// Send it to the server
$result = fwrite($fp, $msg, strlen($msg));

if (!$result)
echo 'Message not delivered' . PHP_EOL;
else
echo 'Message successfully delivered' . PHP_EOL;

// Close the connection to the server
fclose($fp);

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Use below commands to create pem file and use it in above code

$ openssl x509 -in aps_development.cer -inform der -out PushCert.pem

// Convert .p12 to .pem. Enter your pass pharse which is the same pwd that you have given while creating the .p12 certificate. PEM pass phrase also same as .p12 cert.  
$ openssl pkcs12 -nocerts -out PushKey1.pem -in pushkey.p12

Enter Import Password:

MAC verified OK

Enter PEM pass phrase:

Verifying - Enter PEM pass phrase:

// To remove passpharse for the key to access globally. This only solved my stream_socket_client() & certificate capath warnings.
$ openssl rsa -in PushKey1.pem -out PushKey1_Rmv.pem

Enter pass phrase for PushChatKey1.pem:

writing RSA key

// To join the two .pem file into one file:
$ cat PushCert.pem PushKey1_Rmv.pem > ApnsDev.pem

Refer more information

Does GCM works with iOS PushKit framework?

No, GCM for iOS uses the standard APNS push messages on iOS, not the newer VoIP push messages of Apple PushKit. In this way it is similar to the majority of third party push notification services such as Azure Notification Hub.

To my knowledge, only PubNub supports sending push messages using a unified framework for both GCM and Apple PushKit (VoIP push).

I am trying to notify the app when someone starts calling using Agora. I have gotten the basic fundamentals of callkit working I am using firebase too

You have to use PushKit's VoIP notifications in order to be able to receive calls using CallKit. Unfortunately, Firebase doesn't support VoIP pushes.

How to open(start) app when FCM notification recieives without tapping the notification

Yes, you can do it using iOS VoIP Push Notifications.

Here is great Apple guide about Voice Over IP (VoIP) Best Practices, what is the best way to use VoIP Push Notifications. One of the main use case – use VoIP Push Notifications to Avoid Persistent Connections.

In order to use VoIP pushes you have to connect iOS PushKit framework and you have to Configuring APNs with FCM

Please note: Firebase might not support VoIP push kit services. You can get help from firebase support team. You can config your own server or other third party provider.

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