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The following definitions of relevant API interfaces can be viewed in l Lexin's official website: Wi Fi Library - ESP32 - ESP-IDF programming guide v4 4 documents STA mode configuration process: #include <string.h> #include "freertos/FreeRTOS.h" #include "freertos/task.h" #include "freertos/event_groups.h" #include "esp_system.h" #inclu ...

1. Include header file #include <sys/types.h> #include <sys/socket.h> #include <sys/un.h> #include <arpa/inet.h> #include <unistd.h> #include <string.h> #include <time.h> #include <stdlib.h> #include <stdbool.h> #include <net/if.h> 2. Set src and dest, and define a global socket at ...

chapter16 network IPC: socket socket descriptor To create a socket, call the socket function /* domain: Communication domain type: socket type protocol: agreement */ int socket(int domain,int type,int protocol); //If successful, the file (socket) descriptor is returned Socket communication domain is divided into: fielddescribeAF_I ...

The previous section talked about the simple communication between the server and client of java socket, and learned about the communication mechanism of socket. See the following for details: java socket for communication programming Today, let's go further. There is a problem in the previous example, that is, sending messages only once ends. ...

Create and end threads pthread_create #include <pthread.h> /* Create a new thread, starting with execution of START-ROUTINE getting passed ARG. Creation attributed come from ATTR. The new handle is stored in *NEWTHREAD. */ extern int pthread_create (pthread_t *__restrict __newthread, const pthread_attr_t *__restrict __at ...

fork system call #include <sys/types.h> #include <unistd.h> /* Clone the calling process, creating an exact copy. Return -1 for errors, 0 to the new process, and the process ID of the new process to the old process. */ extern __pid_t fork (void) __THROWNL; Each call of this function returns twice. In the parent process, t ...

The third type of events that network programs need to deal with is timing events, such as regularly detecting the active state of a customer connection. Server programs usually manage many timing events. Therefore, effectively organizing these timing events so that they can be triggered at the expected time point without affecting the main log ...

Project introduction Project github: github link This project is based on C + + language, Mr. Chen Shuo's muduo network library, mysql database and json CPP. The server listens to two ports, one for processing http requests and the other for processing json data sent. This project cooperates with a qt+opencv license plate recognition front ...

Public wheels / API It mainly stores global variables, configuration variables, some public method codes, user-defined logs, and redirects the output of Qt compiler information to local files. Log Library It is built to use mvlog library, cross platform general library and simple singleton mode. At the same time, it can redirect and output ...

Recently, I'm thinking about the implementation principle of some software and studying how those popular software are developed. It's quite interesting. Reviewing the software used every day, I found that the most commonly used software should be communication software, such as wechat and nailing. So I wondered how these communication software ...