public function getHsmInfo() { $str = "NC"; $len1 = strlen($str); $buff = Bytes::shortToBytesBigEnd(intval($len1)); $str = Bytes::toStr($buff) . $str; socket_write($this->socket, $str, strlen($str)); $rsp1 = socket_read($this->socket, 2); $len2 = Bytes::bytesToShortBigEnd($rsp1, 0); $rsp2 = socket_read($this->socket, $len2); return $rsp2; }