public function sendHostCheck(string $host, int $returncode, string $message = null) : bool {
        return $this->send($host, '', $returncode, $message);
    }
public function sendHostCheck(string $host, int $returncode, string $message = null) : bool {
        return $this->send($host, '', $returncode, $message);
    }
public function sendHostCheck ( string $ host , int $ returncode , string $ message = null ) : bool { return $ this -> send ( $ host , '' , $ returncode , $ message ) ; }
Sends passive host check

@param string $host
@param int $returncode
@param string $message
@throws \Exception
@return bool
Sends passive host check