Steps to implement remote access control using PHP and MQTT

Steps to implement remote access control using PHP and MQTT

Overview:
Remote access control refers to the function of remote control of the access control system through the network. This article will introduce the steps of how to use PHP and MQTT protocols to implement remote access control, and provide corresponding code examples.

Step 1: Build MQTT server
In order to achieve remote access control, we need to first build an MQTT server for message transmission. You can choose to use an existing MQTT server or a third-party MQTT cloud service provider, such as EMQ X, Mosquitto, etc. Here we take EMQ X as an example to illustrate.

1. Download and install EMQ X server.
2. Start the EMQ X server, you can use the command line or interface to start.
3. Configure the access permissions of the EMQ X server, including user name, password, publishing and subscribing topics, etc.

Step 2: Write the access control controller side code
We need to write an access control controller side code to connect to the MQTT server and send access control instructions to the server.

Code example:

<?php
require('phpMQTT.php');

$mqtt_server = 'localhost'; // MQTT服务器地址
$mqtt_port = 1883; // MQTT服务器端口号
$mqtt_client_id = 'door-control'; // 客户端ID
$mqtt_topic = 'door/control'; // 发布门禁控制指令的主题

// 创建MQTT客户端实例
$mqtt = new phpMQTT($mqtt_server, $mqtt_port, $mqtt_client_id);

if(!$mqtt->connect()){
    exit(1);
}

// 发送门禁控制指令
$mqtt->publish($mqtt_topic, 'open', 0, false);

// 断开MQTT连接
$mqtt->close();

Step 3: Write the access control system side code
We need to write an access control system side code to connect to the MQTT server, receive access control instructions and execute the corresponding operation.

Code example:

<?php
require('phpMQTT.php');

$mqtt_server = 'localhost'; // MQTT服务器地址
$mqtt_port = 1883; // MQTT服务器端口号
$mqtt_client_id = 'door-system'; // 客户端ID
$mqtt_topic = 'door/control'; // 监听门禁控制指令的主题

// 创建MQTT客户端实例
$mqtt = new phpMQTT($mqtt_server, $mqtt_port, $mqtt_client_id);

if(!$mqtt->connect()){
    exit(1);
}

// 监听门禁控制指令
$mqtt->subscribe($mqtt_topic, 0);

while($mqtt->proc()){
    // 获取收到的消息
    $msg = $mqtt->getMsg();

    // 执行门禁控制操作
    if($msg['message'] == 'open'){
        // 执行门禁开门操作
        // TODO: 添加门禁开门的代码
    }
}

// 断开MQTT连接
$mqtt->close();

Step 4: Test remote access control

1. Run the access controller side code to ensure that it can successfully connect to the MQTT server and send access control instruction.
2. Run the access control system side code to ensure that it can successfully connect to the MQTT server and monitor access control instructions.
3. Modify the access control command in the access controller side code to the actual command, for example, "open" means the door opening command.
4. Run the code on the access control controller and observe whether the access control system can successfully receive the access control instructions and perform corresponding operations.

Summary:
Through the above steps, we successfully implemented the remote access control function using PHP and MQTT protocols. We send access control instructions by writing access control controller side code, and receive access control instructions and perform corresponding operations by writing access control system side code. Through the MQTT protocol, we are able to achieve fast and reliable remote access control.

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