A technical review of real-time smart street lighting systems using PHP and MQTT

With the development of smart city construction, smart street light systems have gradually become one of the hot spots in urban management. Traditional street light systems require a lot of manpower and material resources for maintenance and management, while real-time intelligent street light systems can achieve remote monitoring, intelligent control and data analysis, thereby improving the operating efficiency and management level of street lights. This article will introduce how to use PHP and MQTT to implement a real-time smart street light system.

1. Introduction to MQTT protocol

MQTT (Message Queuing Telemetry Transport) is a lightweight message transmission protocol based on the publish/subscribe mechanism. The MQTT protocol was originally developed by IBM and has now become an international standard and is widely used in the Internet of Things, smart homes and other fields.

The working principle of the MQTT protocol is based on a central server (Broker). The device (Client) communicates by connecting to the central server, the Publisher (Publisher) publishes the message to the Topic (Topic), and the Subscriber (Subscriber) obtains the message by subscribing to the topic. The MQTT protocol is simple, lightweight, fast, reliable, and flexible, and is suitable for scenarios with small network bandwidth and few device resources.

2. Design ideas of real-time intelligent street light system

The real-time intelligent street light system includes three parts: street light node, gateway and cloud platform. The node is responsible for collecting street light status data, and the gateway transmits the data to the cloud. The platform performs processing and analysis to achieve intelligent control and remote management. The following is the design idea of ​​the real-time intelligent street light system:

1. Street light node: Use LoraWAN wireless communication technology to communicate and collect street light status data, including light brightness, temperature, humidity, current and other parameters.

2. Gateway: Upload the data collected by the node to the cloud platform through the MQTT protocol, and at the same time accept the instructions issued by the cloud platform to control the running status of the node.

3. Cloud platform: Processes and analyzes data uploaded by nodes to realize functions such as real-time monitoring, intelligent control, and data analysis. It also provides a user interface to facilitate remote management and control by users.

3. PHP implements MQTT client

PHP is a scripting language widely used in web development. It is easy to learn, easy to use, and cross-platform. It can be used in conjunction with the MQTT protocol. Realize functions such as real-time transmission of data and real-time monitoring.

The MQTT protocol uses the TCP/IP protocol. PHP needs to connect to the MQTT Broker through the network, and then use the MQTT protocol for data transmission. To implement the MQTT client in PHP, you need to use third-party libraries, such as phpMQTT, mosquitto, etc. Here we take phpMQTT as an example to introduce the steps to implement the MQTT client in PHP:

1. Download the phpMQTT class library and copy the class library file to phpMQTT .php is introduced into the PHP project.

2. Use PHP code to connect to MQTT Broker, for example:

$mqtt = new phpMQTT("localhost", 1883, "PHP Client");

where "localhost" " represents the host name of the MQTT Broker, 1883 represents the port number of the MQTT Broker service, and "PHP Client" represents the name of the Client.

3. Use PHP code to subscribe to topics or publish messages, for example:

$mqtt->publish("topic", "message", 0);

where "topic" is the subscription topic name, "message" is the message content, and 0 is the message QoS level.

4. Implementing a real-time intelligent street light system

On the basis of completing the MQTT client implementation in PHP, we can use PHP and MQTT to implement a real-time intelligent street light system. The following are the implementation steps:

1. Use the LoraWAN module to collect status data of street lights, such as lamp brightness, temperature, humidity, current and other parameters. Pack the data into JSON format and wirelessly transmit it to the gateway through LoraWAN.

2. After receiving the data uploaded by the LoraWAN module, the gateway parses the data into JSON format and publishes it to the specified topic through the MQTT protocol.

3. The cloud platform subscribes to the specified topic, receives the data uploaded by the node, and processes and analyzes it. You can use PHP and MQTT class libraries to implement the data processing functions of the cloud platform, such as real-time monitoring, historical data analysis, abnormal alarms, etc.

4. The cloud platform issues instructions to the designated topic through the MQTT protocol based on the results of data processing. For example, you can issue instructions to control street light switches and adjust light brightness.

5. After receiving the instructions issued by the cloud platform, the gateway wirelessly transmits the instructions to the street lamp nodes through LoraWAN to realize lighting control.

In short, using PHP and MQTT to implement a real-time intelligent street light system is an effective way. LoraWAN wireless communication technology is used to collect the status data of street lights, and the MQTT protocol is used to realize data transmission and control. It can realize functions such as remote monitoring, intelligent control and data analysis, and improve the operating efficiency and management level of street lights.

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