search
HomeBackend DevelopmentPHP TutorialTechnical guide for remote video surveillance using PHP and MQTT
Technical guide for remote video surveillance using PHP and MQTTJul 07, 2023 pm 10:33 PM
phpmqttRemote monitoring

Technical Guide to Implementing Remote Video Monitoring Using PHP and MQTT

With the development of the Internet of Things and cloud computing, remote monitoring systems have become an indispensable part of modern security management. In this article, we will explore a technical guide on how to implement remote video surveillance using PHP and MQTT protocols. We will introduce how to build a simple monitoring system and provide code examples for readers' reference.

First of all, we need to understand the main technologies and tools used. PHP is a very popular server-side programming language, and MQTT (Message Queuing Telemetry Transport) is a lightweight message transmission protocol based on the publish/subscribe model, which is often used for messaging in IoT applications. In our example, PHP will serve as the backend server and MQTT will be used to transmit video streaming and control instructions.

The following are the steps we take to implement a remote video monitoring system:

1. Install the MQTT server
First, we need to install and configure the MQTT server. Common MQTT servers include Mosquitto and EMQ X, etc. You can choose the MQTT server that suits your needs and follow the corresponding documentation to install and configure it.

2. Build the front-end page
We will use HTML and JavaScript to build the front-end page. First, we need to create a canvas element for displaying the video and assign it an ID, such as "monitor". We will then use JavaScript code to get that canvas element and subscribe to the topic via MQTT to receive the video stream. The code example is as follows:

<script>
  // 获取canvas元素
  var canvas = document.getElementById("monitor");
  var ctx = canvas.getContext("2d");
  
  // 创建MQTT客户端
  var client = new Paho.MQTT.Client("mqtt.example.com", 1883, "clientId");
  
  // 连接MQTT服务器
  client.connect({onSuccess:onConnect});
  
  // 连接成功后订阅主题
  function onConnect() {
    client.subscribe("video/stream");
  }
  
  // 接收并显示视频流
  client.onMessageArrived = function(message) {
    var url = URL.createObjectURL(message.payloadBytes);
    var video = document.createElement("video");
    video.src = url;
    video.onloadedmetadata = function() {
      canvas.width = video.videoWidth;
      canvas.height = video.videoHeight;
      ctx.drawImage(video, 0, 0, canvas.width, canvas.height);
    };
  };
</script>

3. Configure the backend server
Next, we will configure the PHP server to handle the video stream and control instructions. First, we need to install the relevant PHP MQTT client library, such as phpMQTT. You can use Composer to install phpMQTT as follows:

composer require bluerhinos/phpmqttclient

Then, we need to write PHP scripts to handle MQTT messages and video streams. The code example is as follows:

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

// MQTT服务器配置
$mqtt_server = "mqtt.example.com";
$mqtt_port = 1883;
$mqtt_username = "username";
$mqtt_password = "password";

// MQTT订阅主题
$mqtt_topic = "video/stream";

// 创建MQTT客户端
$mqtt_client = new phpMQTT($mqtt_server, $mqtt_port, "clientId");

// 连接MQTT服务器
if ($mqtt_client->connect(true, NULL, $mqtt_username, $mqtt_password)) {
    // 订阅主题
    $mqtt_client->subscribe($mqtt_topic, 0);

    // 处理消息
    while ($mqtt_client->proc()) {
        // TODO: 处理视频流
    }

    // 断开连接
    $mqtt_client->disconnect();
} else {
    echo "Failed to connect to MQTT server";
}
?>

In the above code, you can modify the configuration information of the MQTT server according to the actual situation.

Summary:
Through this article, we learned how to use PHP and MQTT to implement a remote video monitoring system. We use the MQTT protocol to transmit video streams and control instructions, and use PHP as a backend server to process these data. We also provide code examples for front-end pages and back-end scripts to help you get started building your own remote video surveillance system.

Please note that this example only covers basic functionality, and an actual remote video surveillance system may require more functionality and security considerations. Therefore, be sure to give reasonable consideration to issues such as data security and privacy protection when developing and deploying actual systems.

I hope this article will be helpful to you, and I wish you success in building a remote video monitoring system!

The above is the detailed content of Technical guide for remote video surveillance using PHP and MQTT. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
php怎么把负数转为正整数php怎么把负数转为正整数Apr 19, 2022 pm 08:59 PM

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

php怎么实现几秒后执行一个函数php怎么实现几秒后执行一个函数Apr 24, 2022 pm 01:12 PM

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php怎么除以100保留两位小数php怎么除以100保留两位小数Apr 22, 2022 pm 06:23 PM

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php怎么根据年月日判断是一年的第几天php怎么根据年月日判断是一年的第几天Apr 22, 2022 pm 05:02 PM

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php怎么判断有没有小数点php怎么判断有没有小数点Apr 20, 2022 pm 08:12 PM

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

php字符串有没有下标php字符串有没有下标Apr 24, 2022 am 11:49 AM

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php怎么替换nbsp空格符php怎么替换nbsp空格符Apr 24, 2022 pm 02:55 PM

方法:1、用“str_replace("&nbsp;","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\&nbsp\;||\xc2\xa0)/","其他字符",$str)”语句。

php怎么读取字符串后几个字符php怎么读取字符串后几个字符Apr 22, 2022 pm 08:31 PM

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

Safe Exam Browser

Safe Exam Browser

Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 English version

SublimeText3 English version

Recommended: Win version, supports code prompts!

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)