diff --git a/composer.json b/composer.json
index f9c84b5..24dd1e4 100644
--- a/composer.json
+++ b/composer.json
@@ -3,6 +3,7 @@
     "description": "Native ReactPHP WebSocket implementation",
     "type": "library",
     "license": "GPL-3.0-or-later",
+    "keywords": [ "reactphp", "websockets" ],
     "autoload": {
         "psr-4": {
             "NoccyLabs\\React\\WebSocket\\": "src/"
@@ -18,6 +19,7 @@
         "react/http": "^1.9.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^11.0"
+        "phpunit/phpunit": "^11.0",
+        "phpstan/phpstan": "^1.10"
     }
 }
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..e68bade
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,12 @@
+parameters:
+  level: 5
+    
+  excludePaths:
+    - doc
+    - vendor
+    - tests
+
+  # Paths to include in the analysis
+  paths:
+    - src
+
diff --git a/src/Group/ConnectionGroup.php b/src/Group/ConnectionGroup.php
index 0176957..dbfb272 100644
--- a/src/Group/ConnectionGroup.php
+++ b/src/Group/ConnectionGroup.php
@@ -60,4 +60,9 @@ class ConnectionGroup implements EventEmitterInterface, IteratorAggregate, Count
     {
         return $this->name;
     }
+
+    public function write(string $payload)
+    {
+        
+    }
 }
\ No newline at end of file
diff --git a/src/Group/GroupManager.php b/src/Group/GroupManager.php
index ab9870d..fc60866 100644
--- a/src/Group/GroupManager.php
+++ b/src/Group/GroupManager.php
@@ -4,15 +4,19 @@ namespace NoccyLabs\React\WebSocket\Group;
 
 use Evenement\EventEmitterInterface;
 use Evenement\EventEmitterTrait;
-use NoccyLabs\React\WebSocket\WebSocketInterface;
 use React\EventLoop\Loop;
-use WeakReference;
 
 class GroupManager implements EventEmitterInterface
 {
     use EventEmitterTrait;
 
+    /**
+     * @var string emitted when a new group is created
+     */
     const EVENT_CREATED = 'created';
+    /**
+     * @var string emitted after the last member leaves, when the group is destroyed
+     */
     const EVENT_DESTROYED = 'destroyed';
 
     /** @var array<string,ConnectionGroup> */
diff --git a/src/WebSocketConnection.php b/src/WebSocketConnection.php
index ad0bf32..a9be681 100644
--- a/src/WebSocketConnection.php
+++ b/src/WebSocketConnection.php
@@ -54,6 +54,10 @@ class WebSocketConnection implements WebSocketInterface
         $this->groupManager = $groupManager;
 
         $this->inStream->on('data', $this->onWebSocketData(...));
+        $this->inStream->on('close', function () {
+            $this->close();
+            $this->emit('close', []);
+        });
     }
 
     private function onWebSocketData($data)
@@ -87,6 +91,7 @@ class WebSocketConnection implements WebSocketInterface
                 $this->sendPong($payload);
                 return;
             case self::OP_PONG:
+                $this->checkPong($payload);
                 return;
             case self::OP_CLOSE:
                 // TODO implement
@@ -103,11 +108,27 @@ class WebSocketConnection implements WebSocketInterface
         }
     }
 
+    /**
+     * Sends a ping, and closes the connection on timeout.
+     * 
+     */
+    public function ping(): void
+    {
+        // TODO save the state somehow
+        $payload = "ping";
+        $this->send(self::OP_PING, $payload, true);
+    }
+
     private function sendPong(string $data): void
     {
         $this->send(self::OP_PONG, $data, true);
     }
 
+    private function checkPong(string $data): void
+    {
+        // TODO reset the state and any ping timers
+    }
+
     public function setGroup(?string $name): void
     {
         if ($this->group) {
@@ -215,24 +236,4 @@ class WebSocketConnection implements WebSocketInterface
         
     }
 
-    // private function hexdump($data): void
-    // {
-    //     printf("%4d .\n", strlen($data));
-    //     $rows = str_split($data, 16);
-    //     $offs = 0;
-    //     foreach ($rows as $row) {
-    //         $h = []; $a = [];
-    //         for ($n = 0; $n < 16; $n++) {
-    //             if ($n < strlen($row)) {
-    //                 $h[] = sprintf("%02x%s", ord($row[$n]), ($n==7)?"  ":" ");
-    //                 $a[] = sprintf("%s%s", (ctype_print($row[$n])?$row[$n]:"."), ($n==7)?" ":"");
-    //             } else {
-    //                 $h[] = (($n==7)?"    ":"   ");
-    //                 $a[] = (($n==7)?"  ":" ");
-    //             }
-    //         }
-    //         printf("%04x | %s | %s\n", 16 * $offs++, join("", $h), join("", $a));
-    //     }
-    // }
-
 }
\ No newline at end of file