Low Power Bluetooth Learning guide 0519

Classic Bluetooth is designed to unify computing and communications devices around the world, connecting mobile phones to laptops.

Compared to classic Bluetooth, low-power Bluetooth has a relaxed radio parameter requirement for the physical layer, which means
Lower power can be used when sending or receiving data.

Controller:
The physical layer and the link layer, with direct test mode and the lower half of the host Controller Interface (HCI) layer.

Host:
Logical link Control and adaptation Protocol (L2CAP), attribute protocol (Attribute Protocol), and Security Manager protocol
(Security Manager Protocol), attribute specification (GATT), universal access Specification (GAP)
and modes (mode).

The moderate broadening of the radio signal is called the modulation exponent, which represents the upper and lower of the center frequency around the channel.
The width between frequencies. When transmitting a radio signal, a forward offset of more than 185KHz from the center frequency is represented as 2 bits,
A negative offset of more than 185KHz represents a bit with a value of 0.

Connecting Road Layer
Responsible for broadcasting, scanning, establishing and maintaining connections, and ensuring that the packets are organized in the right way, that the checksum is calculated correctly, and that the encryption sequence is correct.

Channel:

The link layer channel is divided into two kinds: broadcast channel and data channel.
Broadcast channel 3, data channel 37.