On the official website of mqtt.org (it has not been updated for a long time), several MQTT servers are recommended. I installed them and felt that each has its own advantages and disadvantages. I am in the WINDOW7 environment.
Regarding the installation of apollo, there are tutorials on the official website, which can be started after installation (compared to mosquitto, there is a visual page, see the relevant information of the connection==)
Regarding the installation of Mosquitto, it is also to download the exe file all the way to next, and finally install it OpenSSL, get the dll file and start it (there are many configuration parameters, you can cluster, etc.). For installation, please refer to
https://sivatechworld.wordpress.com/2015/06/11/step-by-step-installing-and-configuring-mosquitto-with-windows-7/
About debugging Chrome, there is a plug-in MQTT, install After the completion, you
can also use the android terminal to interact as follows. There is code on GIT
(if it is on this machine, remember to set the firewall)