it is observed that the delivery ratio is affected by
introducing more ZigBee nodes, Wi-Fi nodes take the
ZigBee noise as error in packet transmission, it interferes it's
signal if the total activity of the ZigBee nodes become
higher. The ratio decreases from around 96% when there are
no ZigBee nodes to around 88% when there are 9 ZigBee
nodes in proximity. The average end to end delay shows the
converse behaviour, i.e. the delay increases on increasing the
number of nodes and so the energy consumed is also
increased.