I want to BroadCast packet using MAC 802.11 How can I guarantee that the "air" around me are clear before broadcast = if we have this code in mac-802_11.CC Mac802_11::sendRTS(int dst) { ...=20 /* * If the size of the packet is larger than the * RTSThreshold, then perform the RTS/CTS exchange. * * XXX: also skip if destination is a broadcast */ if( (u_int32_t) HDR_CMN(pktTx_)->size() R..