Bluetooth is a wireless technology standard invented in 1994 for exchanging data over short distances. It has evolved over multiple revisions from 2002-2014 to improve features like data transfer speeds, security, and low energy usage. Bluetooth specifications define profiles and services like Generic Access Profile (GAP), Generic Attribute Profile (GATT), and others that are used to discover, connect, and transfer data between Bluetooth devices.

1. Bluetooth machinery

2. BLUETOOTH (BT)
● Bluetooth is a wireless technology standard for
exchanging data over short distances and
building personal area networks (PANs).
● ISM band ( Industrial, Scientific and Medical)
from 2.4 to 2.485 GHz.
● Invented by telecom vendor Ericsson in 1994. It
was originally conceived as a wireless
alternative to RS-232 (com port) data cables
● Danmark king Harald (ᚼ) Bluetooth (ᚼ) -

3. BT REVISIONS
Bluetooth specs has been evolved for a few years from 2002 – 2014:
1.0, 1.1 – error fixes
1.2 – improved radio frequency interference,
2.0 + EDR – added high rate data transmission (3Mbit/s),
2.1+EDR – added SSP (secure simple pairing) to improve pairing
experience
3.0 + HS – improved data transfer speed (up to 24Mbit/s) by
colocation of 802.11 links
4.0 – LE (low energy) specification added which allow bluetooth
device run off a coin cell
4.1 – software changes
4.2 – introduce key features for IoT (firmware update over the air,
security improvements, ip connectivity, etc.)

4. BTLE BUZZWORDS
Bluetooth Smart
Bluetooth Smart Ready

5. BT CORE SYSTEM
https://developer.bluetooth.org/TechnologyOverview/Pages/Core.aspx

6. BT SERVICES
Generic Attribute Profile (GATT)
https://www.bluetooth.org/en-us/specification/adopted-specifications
https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx

7. BT SERVICES
Generic Access Profile (GAP)
This profile defines the generic procedures related to discovery of
Bluetooth devices and link management aspects of connecting to
Bluetooth devices.
It also defines procedures related to use of different security levels.
In addition, this profile includes common format requirements for
parameters accessible on the user interface level.

8. nRFgo DEV BOARD

9. nRFgo TOOLCHAIN

10. nRFgo TOOLCHAIN

11. IOS CoreBluetooth
CBCentralManager
CBPeripheral
CBService CBService
CBCharacteristicCBCharacteristic
CBPeripheralManager
CBMutableService
CBMutableCharacteristic
Peripheral
one which has data
Central
one which handles data