kind of handshaking which is handled by the devices at the
hardware or firmware level.
While connected, the Peripheral may not connect to any other
device.
Disconnecting
A Central may disconnect from a Peripheral at any time. The
Peripheral is aware of the disconnection.
Communication
A Central may send and request data to a Peripheral through
something called a “Characteristic.” Characteristics are provided
by the Peripheral for the Central to access. A Characteristic may
have one or more properties, for example READ or WRITE.
Each Characteristic belongs to a Service, which is like a
container for Characteristics. This paradigm is called the
Bluetooth Generic Attribute Profile (GATT).
The GATT paradigm is laid out as follows (Figure 1-2).
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