Xbee s2c- arduino broad cast mode send data to better rssi

hi!! I have a question!! its related to Arduino XBee library. I have a bunch of Arduino and each Arduino have an XBee S2C. one of them configured as master and others are slaves. here every Xbee is in range of master. now Arduino must be able to choose a slave Arduino with a better RSSI value of them all. and send packets to only to it even when they are set in broadcast mode. I think my question is clear. thanks