php使用php-mqtt/client报错

Question

报错信息
Call to undefined method PhpMqtt\Client\ConnectionSettings::setUsername()

安装
composer require php-mqtt/client

代码

//php-mqtt/client
use \PhpMqtt\Client\MqttClient;
use \PhpMqtt\Client\ConnectionSettings;

public function t3(){

$server   = 'broker.emqx.io';
$port     = 1883;
$clientId = rand(5, 15);
$username = 'emqx_user';
$password = null;
$clean_session = false;

$connectionSettings  = new ConnectionSettings();
$connectionSettings
  ->setUsername($username)
  ->setPassword(null)
  ->setKeepAliveInterval(60)
  // Last Will 设置
  ->setLastWillTopic('emqx/test/last-will')
  ->setLastWillMessage('client disconnect')
  ->setLastWillQualityOfService(1);


$mqtt = new MqttClient($server, $port, $clientId);

$mqtt->connect($connectionSettings, $clean_session);
printf("client connected\n");

$mqtt->subscribe('emqx/test', function ($topic, $message) {
    printf("Received message on topic [%s]: %s\n", $topic, $message);
}, 0);

for ($i = 0; $i< 10; $i++) {
  $payload = array(
    'protocol' => 'tcp',
    'date' => date('Y-m-d H:i:s'),
    'url' => 'https://github.com/emqx/MQTT-Client-Examples'
  );
  $mqtt->publish(
    // topic
    'emqx/test',
    // payload
    json_encode($payload),
    // qos
    0,
    // retain
    true
  );
  printf("msg $i send\n");
  sleep(1);
}

$mqtt->loop(true);
}

根据官方案例emqx mqtt
https://www.emqx.com/zh/blog/...