일단 메인만 가져왔는데요 void bingo_fuck(int c)라는 함수는 키버튼에서 값을 읽어온 c값을 인자값으로 전달하여 도트 매트릭스 디바이스에 각 점들을 찍고  그점들로 빙고를 세는 건데 이부분은 문제될게없는거같은데요
 
일단 문제는 서버에서 sendto해서 보내는것까지는 되거든요? 근데 client가 recfrom해서 값을 전혀 못받네요 왜 서버가 값을 보내는데 이놈이 못받아 먹는지 모르겠어요 형들 알려주세요

요점은  서버에서 sendto해서 전달한값이 클라이언트 recfrom에서 전혀 받질못해요

int main()
{
    unsigned char c;
    int i,k;

    int sockfd;
    int clilen;
    int state;

    struct sockaddr_in serveraddr, clientaddr;

    clilen = sizeof(clientaddr);
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        perror("socket error : ");
        exit(0);
    }

    bzero(&serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
    serveraddr.sin_port = 8000;

    state = bind(sockfd, (struct sockaddr *)&serveraddr, sizeof(serveraddr));
    if (state == -1)
    {
        perror("bind error : ");
        exit(0);
    }

   
    if ((dotFd = open(dev, O_RDWR)) < 0) {
                fprintf(stderr, "cannot open dot (%d)", dev);
                exit(2);
        }
    if((keyFd = open( keyDev, O_RDONLY )) < 0){         // KEY open
  perror("open faile /dev/key");
  exit(-1);
 }
    if ((lcdFd= open( lcdDev, O_RDWR)) < 0) {
        fprintf(stderr, "cannot open LCD (%d)", lcdFd);
        exit(2);
    }

        memset(dot_col, 0, sizeof(dot_col));

 dot_col[0] = 0x00; dot_col[1] = 0x00; dot_col[2] = 0x00; dot_col[3] = 0x00; dot_col[4] = 0x00;
 write(dotFd, dot_col, DOT_COL);

 int new_rnd;
 srand((unsigned int)time(NULL)); //랜덤으로 16개의 값 생성해서 ran_arr[i]에 삽입
 for(i=0; i<16; i++){
  new_rnd = rand()%16;
  for(k=0; k<i; k++){
   if(ran_arr[k] == new_rnd){
    i--;
    break;
   }
  }
  if(ran_arr[i] == ran_arr[k])
   ran_arr[i] = new_rnd;
 }

int d;
 while(1){
  c = key_get(10);
  bingo_fuck(c);
                sendto(sockfd, &c, sizeof(c), 0, (struct sockaddr *)&clientaddr, clilen);
  printf("server send ok!\\n");

         recvfrom(sockfd, &d, sizeof(d), 0, (struct sockaddr *)&clientaddr, &clilen);
  printf("server recive ok!\\n");
  bingo_fuck(d);
 }
 close(sockfd);
return 0;
}
-------------------------------------------------------서버쪽

int main()
{
    unsigned char c;
    int i,k;

    int sockfd;
    int clilen;
    int state;

    struct sockaddr_in serveraddr;

    clilen = sizeof(serveraddr);
    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        perror("socket error : ");
        exit(0);
    }

    bzero(&serveraddr, sizeof(serveraddr));
    serveraddr.sin_family = AF_INET;
    serveraddr.sin_addr.s_addr = inet_addr("192.168.1.50");
    serveraddr.sin_port = 8000;

   
    if ((dotFd = open(dev, O_RDWR)) < 0) {
                fprintf(stderr, "cannot open dot (%d)", dev);
                exit(2);
        }
    if((keyFd = open( keyDev, O_RDONLY )) < 0){         // KEY open
  perror("open faile /dev/key");
  exit(-1);
 }
    if ((lcdFd= open( lcdDev, O_RDWR)) < 0) {
        fprintf(stderr, "cannot open LCD (%d)", lcdFd);
        exit(2);
    }

        memset(dot_col, 0, sizeof(dot_col));

 dot_col[0] = 0x00; dot_col[1] = 0x00; dot_col[2] = 0x00; dot_col[3] = 0x00; dot_col[4] = 0x00;
 write(dotFd, dot_col, DOT_COL);

 int new_rnd;
 srand((unsigned int)time(NULL));
 for(i=0; i<16; i++){
  new_rnd = rand()%16;
  for(k=0; k<i; k++){
   if(ran_arr[k] == new_rnd){
    i--;
    break;
   }
  }
  if(ran_arr[i] == ran_arr[k])
   ran_arr[i] = new_rnd;
 }

int d;
 while(1){
        recvfrom(sockfd, &d, sizeof(d), 0, (struct sockaddr *)&serveraddr, &clilen);
  bingo_fuck(d);
  printf("client recive ok!\\n");

  c = key_get(10);
  bingo_fuck(c);
                sendto(sockfd, (void *)&c, sizeof(c), 0, (struct sockaddr *)&serveraddr, clilen);
  printf("client send ok!\\n");
 }

return 0;
}
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