Add wildcard example

examples/wildcard.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * This file is part of Simps.
+ *
+ * @link     https://github.com/simps/mqtt
+ * @contact  Lu Fei <[email protected]>
+ *
+ * For the full copyright and license information,
+ * please view the LICENSE file that was distributed with this source code.
+ */
+
+include_once __DIR__ . '/bootstrap.php';
+
+use Simps\MQTT\Client;
+use Simps\MQTT\Protocol\Types;
+use Swoole\Coroutine;
+
+Coroutine\run(function () {
+    $client = new Client(SIMPS_MQTT_REMOTE_HOST, SIMPS_MQTT_PORT, getTestConnectConfig());
+    $will = [
+        'topic' => 'simps-mqtt/users/byebye',
+        'qos' => 0,
+        'retain' => 0,
+        'message' => 'byebye',
+    ];
+    $client->connect(true, $will);
+    $topics['simps-mqtt/users/#'] = 0;
+    $client->subscribe($topics);
+    $timeSincePing = time();
+    while (true) {
+        try {
+            $buffer = $client->recv();
+            if ($buffer && $buffer !== true) {
+                var_dump($buffer);
+                // QoS1 PUBACK
+                if ($buffer['type'] === Types::PUBLISH && $buffer['qos'] === 1) {
+                    $client->send(
+                        [
+                            'type' => Types::PUBACK,
+                            'message_id' => $buffer['message_id'],
+                        ],
+                        false
+                    );
+                }
+                if ($buffer['type'] === Types::DISCONNECT) {
+                    echo "Broker is disconnected\n";
+                    $client->close();
+                    break;
+                }
+            }
+            if ($timeSincePing <= (time() - $client->getConfig()->getKeepAlive())) {
+                $buffer = $client->ping();
+                if ($buffer) {
+                    echo 'send ping success' . PHP_EOL;
+                    $timeSincePing = time();
+                }
+            }
+        } catch (\Throwable $e) {
+            throw $e;
+        }
+    }
+});