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  1. #import "ViewController.h"
  2. #include <sys/types.h>
  3. #include <sys/socket.h>
  4. #include <arpa/inet.h>
  5.  
  6. @interface ViewController ()
  7.  
  8. @end
  9.  
  10. @implementation ViewController
  11.  
  12. - (void)viewDidLoad {
  13.     [super viewDidLoad];
  14. }
  15.  
  16. - (IBAction)clickedSendButton:(id)sender {
  17.     int sock;
  18.     struct sockaddr_in addr;
  19.    
  20.     sock = socket(AF_INET, SOCK_DGRAM, 0);
  21.    
  22.     addr.sin_family = AF_INET;
  23.     addr.sin_port = htons(8888);
  24.     addr.sin_addr.s_addr = inet_addr("192.168.100.101");
  25.    
  26.     sendto(sock, "HELLO", 5, 0, (struct sockaddr *)&addr, sizeof(addr));
  27.    
  28.     close(sock);
  29. }
  30. @end
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