First of all, let's understand what is half-duplex communication?
Half-duplex data transfer allows data to be transmitted in both directions, but at a certain point, data is only allowed to be transmitted in one direction, it is actually a simplex communication that switches directions.
TCP server code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdint.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define PORT 8100
/* Print Error Message */
void error()
{
perror("Socket Creation Failed");
exit(EXIT_FAILURE);
}
int main()
{
uint32_t sockfd,conn;
char server_msg[10000],client_msg[10000];
struct sockaddr_in server_addr,client_addr;
/* Create a streaming socket */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
error();
}
/* Server-side binding address and port */
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
printf("Server is running...\n");
/* Bind socket to server */
if (bind(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
{
error(); /// If binding is unsuccessful
}
/* Listen to the client, the maximum number of listeners, we set it here to 5 */
lists(sockfd, 5);
printf("Server is listening...\n");
/* When the server finds a new connection request, the server creates a socket descriptor to respond to accept, which is used to send and receive data */
conn = accept(sockfd, (struct sockaddr *)NULL, NULL);
printf("Server is connected...\n");
while (1)
{
bzero(&server_msg, sizeof(server_msg));
bzero(&client_msg, sizeof(client_msg));
/* Send Message */
printf("\nEnter message here: ");
fgets(server_msg, 10000, stdin);
senda (conn, server_msg, strlen (server_msg) + 1, 0);
/* Receive Messages */
recv(conn, client_msg, sizeof(client_msg), 0);
printf("\nClient Message: %s\n", client_msg);
}
/* 关闭socket */
close(sockfd);
printf("Server is offline...\n");
return 0;
}
Server running status:
TCP client code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdint.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define PORT 8100
void error()
{
perror("Socket Creation Failed");
exit(EXIT_FAILURE);
}
int main()
{
uint32_t sockfd;
struct sockaddr_in server_addr;
char serverResponse [10000], clientResponse[10000];
/* Client creates socket */
if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
{
error();
}
bzero(&server_addr, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(PORT);
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
printf("Client is running...\n");
/* Connect to the server */
connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
printf("Client is connected...\n");
while (1)
{
bzero(&serverResponse, sizeof(serverResponse));
bzero(&clientResponse, sizeof(clientResponse));
/* Receive Messages */
recv(sockfd,serverResponse,sizeof(serverResponse), 0);
printf("\nServer-message:%s\n", serverResponse);
/* Send Message */
printf("\nEnter message here: ");
fgets(clientResponse, 10000, stdin);
send(sockfd, clientResponse, strlen(clientResponse) + 1, 0);
}
/* 关闭socket */
close(sockfd);
printf("Client is offline...\n");
return 0;
}
Client Running Status:
