1. Introduce the mqtt library

Git address: https://github.com/bluerhinos/phpMQTT

我这边没用composer引入，直接把库里面的phpMQTT.php代码复制出来，改了个名字叫MqttNewService

2. thinkphp6.0 creates a script to receive data

1. Create a custom command class file and run the command

php think make:command Mqtt mqtt

2. Configure the config/console.php file

<?php

return [
    // 指令定义
    'commands' => [
        'mqtt' => 'app\command\Mqtt'
    ],
];

3. PHP functions used

bin2hex() 函数把 ASCII 字符的字符串转换为十六进制值。字符串可通过使用 pack() 函数再转换回去。

pack() 函数把数据装入一个二进制字符串。

因为我这边是和硬件通信，所有消息都是16进制的，所以需要用的这两个函数，如果你的业务使用string或者json，那就不需要使用这两个函数了，可以把下面代码里面对应的函数删掉

4. Subscribe to receive news

<?php

namespace app\command;

use think\console\Command;
use think\console\Input;
use think\console\Output;
use app\common\service\MqttNewService;

class Mqtt extends Command
{
    
    
    protected function configure()
    {
    
    
        // 指令配置
        $this->setName('mqtt')
            ->setDescription('the mqtt command');
    }

    protected function execute(Input $input, Output $output)
    {
    
    
        $this->subscribe();
    }

    //订阅接收消息
    protected function subscribe()
    {
    
    
        $server   = 'xx.com';
        $port     = 1883;
        $clientId = 'test_emqx'. rand(1000000, 99999999);
        $topic    = "test-mqtt-12345";
        $username = "";
        $pwd      = "";

        $mqtt = new MqttNewService($server, $port, $clientId);
        if(!$mqtt->connect(true, NULL, $username, $pwd)) {
    
    
            exit(1);
        }

        $mqtt->debug = true;

        $topics[$topic] = array('qos' => 0, 'function' => array($this,"procMsg"));
        $mqtt->subscribe($topics, 0);

        while($mqtt->proc()) {
    
    

        }

        $mqtt->close();
    }

    function procMsg($topic, $msg){
    
    
        $msg = bin2hex($msg);
        echo $msg. "\n";
    }
}

在项目下使用php think mqtt将这个脚本运行起来，然后用MQTTX软件发送消息进行测试

MQTTX是用来测试mqtt的软件，下载地址：https://www.emqx.com/zh/products/mqttx

insert image description here

可以看到脚本已经接收到了数据

5. Release news

    //发布消息
    public function publish()
    {
    
    
        $msg = input('msg');
        $server = 'xx.com';
        $port = 1883;
        $username = '';
        $password = '';
        $clientId = 'test_emqx'. rand(1000000, 99999999);

        $mqtt = new MqttNewService($server, $port, $clientId);

        if ($mqtt->connect(true, NULL, $username, $password)) {
    
    
            $mqtt->publish('test-mqtt-12345', pack('H*',$msg), 0, false);
            $mqtt->close();
        } else {
    
    
            echo "Time out!\n";
        }
    }