Before we start, we need to understand first Bluetooth communication, there are 2 types Bluetooth communications, Classic Bluetooth i.e Bluetooth 2.0 Bluetooth Low energy i.e BLE 4.0 Actually, Classic Bluetooth specification started from Bluetooth 1.0 and 1.0B, these specifications are handled by SIG (Bluetooth Special Interest Group) and all Bluetooth manufacturers and service companies are a member of SIG.