1、服务端代码：

package main

import (
	"fmt"
	"net"
)

func handleClient(conn net.Conn) {
	defer conn.Close()

	fmt.Println("Client connected:", conn.RemoteAddr())

	// 读取客户端的数据
	buffer := make([]byte, 1024)
	for {
		n, err := conn.Read(buffer)
		if err != nil {
			fmt.Println("Error reading:", err)
			return
		}

		// 处理接收到的数据
		data := string(buffer[:n])
		fmt.Printf("Received from %s: %s\n", conn.RemoteAddr(), data)

		// 回复心跳响应
		response := "Heartbeat response"
		conn.Write([]byte(response))
	}
}

func main() {
	listener, err := net.Listen("tcp", ":8080")
	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	defer listener.Close()

	fmt.Println("Heartbeat server listening on :8080")

	for {
		conn, err := listener.Accept()
		if err != nil {
			fmt.Println("Error accepting connection:", err)
			continue
		}

		// 启动一个goroutine处理客户端连接
		go handleClient(conn)
	}
}

2、客户端代码：

package main

import (
	"fmt"
	"net"
	"time"
)

func sendHeartbeat(conn net.Conn) {
	for {
		// 发送心跳数据
		heartbeat := "Heartbeat message"
		conn.Write([]byte(heartbeat))

		// 等待一段时间再发送下一次心跳
		time.Sleep(time.Second * 5)
	}
}

func main() {
	conn, err := net.Dial("tcp", "localhost:8080")
	if err != nil {
		fmt.Println("Error connecting to server:", err)
		return
	}
	defer conn.Close()

	fmt.Println("Connected to server:", conn.RemoteAddr())

	// 启动goroutine发送心跳
	go sendHeartbeat(conn)

	// 主goroutine保持运行，等待心跳
	select {}
}

3、最终实现效果：