header->fcf &= 1 << IEEE154_FCF_ACK_REQ;
header->fcf |= ( ( IEEE154_TYPE_DATA << IEEE154_FCF_FRAME_TYPE ) |
( 1 << IEEE154_FCF_INTRAPAN ) |
header->fcf &= 1 << IEEE154_FCF_ACK_REQ;
header->fcf |= ( ( IEEE154_TYPE_DATA << IEEE154_FCF_FRAME_TYPE ) |
( 1 << IEEE154_FCF_INTRAPAN ) |