Use of connect after recvfrom with socket

Question

Hi i want to wait the first message of a client as a server with a UDP Protocol so i send a message when I create the client socket and I use a recvfrom to get the message and the adress of the client.It works pretty good I can read the message in my buffer but after this operation I try to connect the server to the client address but this operation return a value of -1 for the connect process and I don't understand the reason.Here is my function wait for client the error is at the end when I try to connect to clientaddr.

int wait_for_client(int sfd){

    struct sockaddr_in clientaddr;
    int len;
    char buf[32];
    len = sizeof(clientaddr);
    int rec_stat = recvfrom(sfd, buf, 32, 0, (struct sockaddr*)&clientaddr, (socklen_t *)&len);
    if(rec_stat<0){
        printf("echec de receive");
        fflush(stdout);
        return -1;
    }
    printf("%s\n",buf);
    fflush(stdout);
    int connect_status = connect(sfd,(struct sockaddr *)&clientaddr,sizeof(clientaddr));
    if(connect_status == -1){
        printf("failed to connect to client\n");
        fflush(stdout);
        return -1;
    }
    printf("%s\n",buf);
    return sfd;
}

Answer 1

The problem was because my clientaddr is declared as sockaddr_in but my client was created as sockaddr_in6. So the mistake was the struct of my clientaddr