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With the development of technology, the home Internet of Things (IoT) has become the choice of more and more families. However, allowing all devices to interact in real time requires a reliable middleware. In this article, we will introduce how to implement real-time home IoT using PHP and Redis.
First, we need to install and configure Redis on the server. Redis is an open source in-memory data structure storage system used as a database, cache and message queue.
To install Redis on a Linux server, you can use the following command:
sudo apt-get update sudo apt-get install redis-server
After the installation is complete, we can check whether Redis is running by running the following command:
redis-cli ping
If the running result is "PONG", Redis is running and we can continue to use it.
In PHP, you can use the PHP Redis extension library to interact with Redis. We can install it by running the following command:
sudo apt-get install php-redis
To connect to the Redis instance, we can use the following code:
$redis = new Redis(); $redis->connect('127.0.0.1');
In the Connect method, we pass the IP address of the Redis instance. If your Redis is not on your local machine, change the IP address to a valid IP address for your instance.
Next, we need to make some settings for Redis, including:
We will discuss these settings in more detail in the following sections.
The publish/subscribe pattern is a common messaging pattern that can be used to achieve real-time communication. Among them, the publisher publishes the message to a channel, and the subscriber can subscribe to this channel to receive related messages.
In PHP, the publish/subscribe mode is implemented by using the publish method. Here is an example:
$redis->publish('channel', 'message');
In this code, we publish "message" to a channel named "channel". To subscribe to a channel, we can use the subscribe method, for example:
$redis->subscribe(array('channel'), function ($redis, $channel, $message) { echo "Received message on channel $channel: $message"; });
In this code, we subscribe to the channel named "channel" and return the message received when logging in to the user.
Persistence is a method of writing Redis data to disk to avoid data loss. When the Redis server crashes, it can recover data and guarantee data integrity. There are two types of persistence available:
We can use the following command to configure persistence mode:
$redis->config('SET', 'save', '900 1 300 10 60 10000');
In this example, we set the Redis configuration to save the data set on the hard disk for at least:
By default, Redis has no password. Therefore, for security reasons, we need to set a password in Redis.
We can use the following code to set the Redis password:
$redis->config('SET', 'requirepass', 'myPassword');
Change 'myPassword' to the password of your choice.
In this article, we introduced how to implement real-time home IoT using PHP and Redis. We saw how to connect to Redis, how to set Redis key expiration time, how to enable persistence, how to configure the Redis password and how to implement the publish/subscribe pattern in PHP.
Through these technologies, you can more easily achieve communication between real-time devices and maintain data security and integrity.
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