code: public function broadcast(Message $message, string $topicArn)
      {
          if ($this->debug) {
              $this->logger && $this->logger->notice(
                  "Message would have been sent to $topicArn",
                  [
                      'Message' => $message,
                  ]
              );
  
              return;
          }
  
          $this->messages->send($message, $topicArn);
      }
docs: Send a message to all topics in the group.
  
  @param Message $message
  @param string  $topicArn
  
  @deprecated Use Messages send method and pass the topicArn as the destination
  @see Messages::send