public function __construct($username, $password, $headers = [])
{
parent::__construct('tcp://datafeeds.networkrail.co.uk:61618', $username, $password, $headers);
}
public function __construct($queue, $headers = [])
{
parent::__construct('tcp://datafeeds.nationalrail.co.uk:61613', 'd3user', 'd3password', $headers);
$this->connection->subscribe($queue);
}
