解决：下载缺少的dll组件，放到安装目录。
报错：The procedure entry point CRYPTO_memcmp could not be located in the dynamic link library LIBEAY32.dll
解决：安装openssh,但注意mosquitto ReadMe里给的openssh下载链接里的文件安装后并无LIBEAY32.dll，后来找了好久才找到正确版本的openssh
https://download.csdn.net/download/sujuanxu/10386428
该版本的openssh安装后，才有LIBEAY32.dll，将其放到mosquitto安装目录下。