对gatewayworker中client_id的疑问

我用硬件连接了gatewayworker, 在onConnect和onMessage中记录clientid,
在在onConnect中的记录如下：
test1.txt里：
2023-05-17 12:41:07 7f0000010b5400000001
2023-05-17 13:23:56 7f0000010b5500000001
2023-05-17 13:28:53 7f0000010b5500000002
2023-05-17 14:30:05 7f0000010b5700000001
2023-05-17 14:30:09 7f0000010b5600000001
2023-05-17 14:30:14 7f0000010b5700000002
2023-05-17 14:30:18 7f0000010b5500000003
2023-05-17 14:30:48 7f0000010b5600000002
2023-05-17 14:30:53 7f0000010b5600000003
2023-05-17 14:30:59 7f0000010b5500000004
2023-05-17 15:29:52 7f0000010fa200000001
2023-05-17 15:29:52 7f0000010b5600000004
test2.txt里：
2023-05-17 12:41:07 7f0000010b5400000001
2023-05-17 12:41:34 7f0000010b5400000001
2023-05-17 12:41:38 7f0000010b5400000001
2023-05-17 12:42:08 7f0000010b5400000001
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代码如下：

public static function onConnect($client_id)
{

    $file="test1.txt";
    $content=date('Y-m-d H:i:s',time()).' '.$client_id."\r\n";
    file_put_contents($file, $content,FILE_APPEND);

}

/**

• 当客户端发来消息时触发
• @param int $client_id 连接id

• @param mixed $message 具体消息
  */
  public static function onMessage($client_id, $message)
  {

  $file="test2.txt";
  $content=date('Y-m-d H:i:s',time()).' '.$client_id."\r\n";
  file_put_contents($file, $content,FILE_APPEND);
  疑问：为什么client_id在onConnect中有变化，在onMessage中得到的client_id一直没有更换？