取决于你的服务器的类型已经你使用的通信技术，是TCP还是Websockets，以Mosquitto的window的版本为例子，如果使用Websockets，其最大支持64客户端的同时连接。具体请参看Mosquitto的readme.txt文档，现在摘抄如下：Websockets----------The broker executables provided in the installers do not have Websockets support enabled.If you wish to have a version of the broker with Websockets support, you will need to compilelibwebsockets version v1.7 onwards because no Windows binaries are provided.Please note that on Windows, libwebsockets limits connections to a maximum of 64 clients.如果是用TCP的话，估计支持1000多的客户同时在线连接不成问题。
