Update config

config/broadcasting.php

@@ -11,7 +11,7 @@ return [
     | framework when an event needs to be broadcast. You may set this to
     | any of the connections defined in the "connections" array below.
     |
-    | Supported: "pusher", "redis", "log", "null"
+    | Supported: "pusher", "ably", "redis", "log", "null"
     |
     */
 
@@ -36,9 +36,20 @@ return [
             'secret' => env('PUSHER_APP_SECRET'),
             'app_id' => env('PUSHER_APP_ID'),
             'options' => [
-                'cluster' => env('PUSHER_APP_CLUSTER'),
-                'useTLS' => true,
+                'host' => env('PUSHER_HOST') ?: 'api-'.env('PUSHER_APP_CLUSTER', 'mt1').'.pusher.com',
+                'port' => env('PUSHER_PORT', 443),
+                'scheme' => env('PUSHER_SCHEME', 'https'),
+                'encrypted' => true,
+                'useTLS' => env('PUSHER_SCHEME', 'https') === 'https',
             ],
+            'client_options' => [
+                // Guzzle client options: https://docs.guzzlephp.org/en/stable/request-options.html
+            ],
+        ],
+
+        'ably' => [
+            'driver' => 'ably',
+            'key' => env('ABLY_KEY'),
         ],
 
         'redis' => [