sentences:  Wireless Sensor Networks (WSN / WSAN) are, generically, networks of low-power, low-cost devices that interconnect wirelessly to collect, exchange, and sometimes act-on data collected from their physical environments - "sensor networks".Nodes typically connect in a star or mesh topology.While most individual nodes in a WSAN are expected to have limited range (Bluetooth, ZigBee, 6LoWPAN, etc.