Bluetooth Stack Introduction
<todo>
GAP Mode Flags
Bluetooth modes:
LE - low energy
BR - Bluetooth regular
EDR - enhanced data rate
(source https://www.mathworks.com/help/comm/ug/comparison-of-bluetooth-bredr-and-ble.html)
LE Limited Mode: the device only advertises for 30 seconds, and will stop afterward (can no longer discover in other devices) until user resets.
LE General Mode: the device will continue advertising