header->fcf &= 1 << IEEE154_FCF_ACK_REQ;
header->fcf |= ( ( IEEE154_TYPE_DATA << IEEE154_FCF_FRAME_TYPE ) |
( 1 << IEEE154_FCF_INTRAPAN ) |
( IEEE154_ADDR_SHORT << IEEE154_FCF_DEST_ADDR_MODE ) |
( IEEE154_ADDR_SHORT << IEEE154_FCF_SRC_ADDR_MODE ) );
header->fcf &= 1 << IEEE154_FCF_ACK_REQ;
header->fcf |= ( ( IEEE154_TYPE_DATA << IEEE154_FCF_FRAME_TYPE ) |
( 1 << IEEE154_FCF_INTRAPAN ) |
( IEEE154_ADDR_SHORT << IEEE154_FCF_DEST_ADDR_MODE ) |
( IEEE154_ADDR_SHORT << IEEE154_FCF_SRC_ADDR_MODE ) );