turning nagle off when on a unicast socket

//---------------------------------------------
// Create a udp socket for sending reRequests
//
udpRequestsocket_  = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if ( udpRequestsocket_ == INVALID_SOCKET)
{
    WSACleanup();
    return 1;
}
int flag = 1;
int result = setsockopt(udpRequestsocket_,            /* socket affected */
                        IPPROTO_TCP,                  /* set option at TCP level */
                        TCP_NODELAY,                  /* name of option */
                        (char *)flag,                 /* the cast is historical  cruft */
                        sizeof(int));                /* length of option value */
if (result)
{
    sprintf_s(logBuf, sizeof(logBuf), "ERR: error:%d setting setsockopt for      updRequestsocket_", WSAGetLastError());
    MyLog(logBuf);
}