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Today, I will talk to you about how to build a mqtt server in java. Many people may not know much about it. In order to make you understand better, the editor has summarized the following content for you. I hope you can get something according to this article.

Install the Emqx server

Install the necessary dependencies: $sudo yum install-y yum-utils device-mapper-persistent-data lvm2 sets up a stable repository For example, in the case of CentOs7: $sudo yum-config-manager-- add-repo https://repos.emqx.io/emqx-ce/redhat/centos/7/emqx-ce.repo installs the latest version of EMQ X$ sudo yum install emqx. You can also install a specified version to query the software version list first $yum list emqx-- showduplicates | sort-remqx.x86_64 3.1.0-1.el7 emqx. -stableemqx.x86_64 3.0.1-1.el7 emqx-stableemqx.x86_64 3.0.0-1.el7 emqx-stable choose one of the versions to install $sudo yum install emqx-4.2.4 launch Emqx directly launch $emqx start emqx 3.1.0 is started fully loaded $emqx_ Ctl status Node 'emqx@127.0.0.1' is started emqx v3.1.0 is running system starts the $sudo systemctl start emqx service starts the $sudo service emqx start``` open port

Ali Cloud instance security group and firewall open ports

The protocol corresponding to the port may function as 1883 MQTT protocol port8883 MQTT/SSL port8083 MQTT/WebSocket port8080 HTTP API port18083 Dashboard Management Console Port to access the Emqx service backend

Access the backend address: http://localhost:18083, where localhost can be replaced with your CVM public network IP or virtual machine IP. Login account: admin, password: public. Enter the Web Management console. As shown in the following figure

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