1. #include <stdio.h>
2. #include <stdlib.h>
3. #include <string.h>
4. #include <unistd.h>
5. #include <sys/socket.h>
6. #include <netinet/in.h>
7. #include <arpa/inet.h>
8. #define PORT 8080
9. #define SERVER_IP "10.10.161.31"
10. int main() {
11.  int client_fd;
12.  struct sockaddr_in server_address;
13.  char message[1024];
14. // Create socket
15.  client_fd = socket(AF_INET, SOCK_STREAM, 0);
16.  if (client_fd < 0) {
17.   perror("socket");
18.   exit(1);
19.  }
20. // Set server address
21.  memset(&server;_address, 0, sizeof(server_address));
22.  server_address.sin_family = AF_INET;
23.  server_address.sin_port = htons(PORT);
24.  inet_pton(AF_INET, SERVER_IP, &server;_address.sin_addr);
25. // Connect to server
26.  if (connect(client_fd, (struct sockaddr *)&server;_address, sizeof(server_address)) < 0) {
27.  perror("connect");
28.  exit(1);
29.  }
30.  printf("Connected to server\n");
31.  while (1) {
32. // Get target ID and message from user
33.  printf("Enter target ID (0 - 4) and message (separated by space): ");
34.  fgets(message, sizeof(message), stdin);
35. // Extract target ID and message content
36.  char *target_id_str = strtok(message, " ");
37.   char *message_c "\n");
38.  if (target_id_str != NULL && message_content != NULL) {
39.  int target_id = atoi(target_id_str);
40. // Send target ID and message to serversprintf(message, "%d %s", target_id, message_content); // Combine ID and message
41.  int bytes_sent = send(client_fd, message, strlen(message), 0);
42.  if (bytes_sent < 0) {
43.   perror("send");
44.   break;
45.  }
46. // Receive and print server response (optional)
47.  int bytes_received = recv(client_fd, message, sizeof(message), 0);
48.  if (bytes_received > 0) {
49.  message[bytes_received] = '\0'; // Null terminate received data
50.  printf("Server: %s\n", message);
51. } else {
52. if (bytes_received == 0) {
53. printf("Server disconnected\n");
54. } else {
55. perror("recv");
56. }
57. break;
58. }
59. } else {
60. printf("Invalid message format\n");
61. }
62. }
63. // Close connection
64. close(client_fd);
65. return 0;
66. }