Why heartbeat detection is needed When server A and client B establish a connection through TCP, client B suddenly exits abnormally, such as network disconnection, power outage, abnormal program termination, etc. Server A cannot know the abnormal disconnection of client B and may still While maintaining the connection status with the client, it will still […]
Tag: heartbeat
[C++ TCP server class–with heartbeat detection]
1.TCP server class encapsulation #ifndef _TCP_SERVER_H_ #define _TCP_SERVER_H_ #include <string> #ifdef __cplusplus extern “C” {<!– –> #endif #define TCP_PORT_NO 8888 //Port number #define TCP_BUFFER_SIZE (4*1024) //4k #define HEART_BEAT_INTERVAL (15) //Heartbeat interval 15s class Tcp_Server {<!– –> private: static Tcp_Server *g_object; Tcp_Server(); ~Tcp_Server(); private: static void* tcp_socket_thread_loop(void* data); static void* tcp_socket_beat_thread_loop(void *data); void handle_request(int sockfd); private: […]
Flutter: WebSocket encapsulation-implementing heartbeat and reconnection mechanism
PrefacePermalink Introduction to Flutter Flutter is a mobile application development framework launched by Google and open source, focusing on cross-platform, high fidelity and high performance. Developers can develop apps through the Dart language, and a set of code runs on both iOS and Android platforms. Flutter provides a wealth of components and interfaces, and developers […]
Java IO stream (5) Netty combat [TCP|Http|heartbeat detection|Websocket]
Netty entry code example (based on TCP service) Server side package com.bierce.io.netty.simple; import io.netty.bootstrap.ServerBootstrap; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.*; import io.netty.channel.nio.NioEventLoopGroup; import io.netty.channel.socket.SocketChannel; import io.netty.channel.socket.nio.NioServerSocketChannel; import io.netty.util.CharsetUtil; public class NettyServer { public static void main(String[] args) throws InterruptedException { //Create BossGroup and WorkerGroup thread pool groups, both of which belong to the spin state […]
Add springboot to the front end to implement Web Socket connection communication and test process (including back-end implementation of heartbeat detection)
[2023] Add springboot to the front end to implement Web Socket connection communication (including back-end implementation of heartbeat detection) foreword 1. Brief introduction to Web Socket 1 Why use websocket? 2. Code implementation 1. Front-end (html) 1.1. Send messages to back-end without front-end 1.2. There is a front-end that sends messages to the back-end. 2. […]
WebSocket server data push and heartbeat mechanism (Spring Boot + VUE)
1. Introduction to WebSocket The HTML5 specification has brought us many new features on the basis of traditional web interaction. As web technology is widely used in the development of web APP, these new features can be promoted and used. As a new web communication technology, websocket Of great significance. WebSocket is a new protocol […]
websocket usage and heartbeat messages
Preface: There is a problem when using settimeout to send heartbeat messages. It may be that the encapsulation method is not written well or for other reasons. The thread is blocked or the timer is not cleared? I don’t understand. The solution was finally solved (the final code is at the bottom), but there are […]
The implementation logic of Netty custom message protocol handles sticky packet unpacking and heartbeat mechanism
Netty Implementation logic of custom message protocol custom encoder heartbeat mechanism Implement the client to send heartbeat packets Implementation logic of custom message protocol Message protocol: This time the message needs to contain two parts, namely the message length and the message content itself. Custom message encoder: The message encoder converts the message sent by […]
webSocket heartbeat mechanism (vue)
First, start sending the heartbeat mechanism in the callback of successful connection // callback for successful connection establishment onopenCallback: function (event) { console.log(“WebSocket: Connected”); // Heartbeat detection reset this. heartCheck. reset(). start(); }, When the heartbeat packet returned by the server is received, it means that the connection is normal, and the heartbeat detection is […]
TI millimeter wave radar human vital signs (breathing, heartbeat) signal extraction algorithm (IWR6843ISK+DCA1000EVM)
Directory I. Introduction 2. The basic principle of millimeter wave radar detection of breathing and heartbeat 1. TI official development information: 2. Blogger “Naughty Continuous Wave” open source information and principle explanation: 3. Matlab algorithm processing of millimeter-wave radar extraction of breathing and heartbeat signals 1. Hardware platform: IWR6843ISKEVM + DCA1000EVM 2. Mmavestudio parameter settings: […]