Frequency hopping spread spectrum is used to share the medium among devices in a Bluetooth piconet. Using an example, explain how this works. Bluetooth allows frequency hopping with $79$ subcarriers. If two Bluetooth piconets are operating simultaneously, what is the probability that they will collide in any given frame? In a WiFi network, what services are provided by each of Basic Service Set $($BSS$)$ and Extended Service Set $($ESS$)?$ Briefly describe medium access sharing in WiFi, making specific reference to inter$-$frame spacing.