B-LE - GATT Architectural Overview: Difference between revisions
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== | == GATT - Architectural Overview == | ||
Description what this documentation is about. | Description what this documentation is about. | ||
| Line 12: | Line 12: | ||
== Description == | == Description == | ||
=== | === GAP - Generic Attribute Profile === | ||
The Generic attribute profile takes care of discovery, security, connectivity and network technolgies of a device. | |||
=== | ADV_IND | ||
SCAN_REQ | |||
SCAN_RSP | |||
CONNECT_IND | |||
AUX_SCAN_REQ | |||
AUX_SCAN_RSP | |||
AUX_CONNECT_REQ | |||
AUX_CONNECT_RSP | |||
ADV_SCAN_IND | |||
=== GATT - Generic Attribute Profile === | |||
As soon as two Bluetooth Low Energy devices establish a connection they can start transfering data back and forth. This data is formated into Services and Characteristics in a Server/Client relationship. | |||
=== Network Topology === | |||
The network topology of GATT networks contains so-called central devices and peripheral devices. One peripheral is only connected to only one central device at a time. A central device can connect to many peripheral devices. The peripheral is also acting as the GATT server. It contains the definitions for profiles, services and characteristics of a device. The central device always initiates the data exchange. | |||
=== ATT - Attribute Protocol === | |||
GATT is based on ATT. Each attribute gets it’s own Unique Identifier (UUID) here. These get formatted as characteristics and services. | |||
=== Profiles === | |||
set of services per Profile | |||
Example profiles: Basic audio profile, Location and navigation profile, weight scale profile, heart rate profile | |||
=== Services === | |||
A Service can have multiple characteristics. It has it’s own UUID. It has a handle. UUID, permissions, value | |||
=== Characteristics === | |||
The characteristics are the lowest-level of the GATT Profiles. They also each use their own UUID. | |||
These are relevant when it comes to protecting and enhancing security of a Bluetooth Low Energy device. | |||
The characteristics have a value, properties and human-readable descriptors | |||
=== BLE Operations === | |||
* Read | |||
Read the data of a characteristic | |||
* Write | |||
Write data to a characteristic | |||
* Notify | |||
Get notifications to value changes of a device by subscribing to it | |||
=== Further Context === | |||
Make sure to read | Make sure to read | ||
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== Courses == | == Courses == | ||
* [[ | * [[Selected IT-Security Chapters]] (2024) | ||
== Author == | |||
Are Maksimović | |||
== References == | == References == | ||
* https:// | * https://bleak.readthedocs.io/en/latest/usage.html | ||
* https:// | * https://www.bluetooth.com/de/bluetooth-resources/intro-to-bluetooth-gap-gatt/ | ||
[[Category:Documentation]] | [[Category:Documentation]] | ||
Revision as of 15:04, 5 December 2024
GATT - Architectural Overview
Description what this documentation is about.
Requirements
- Operating system: Ubuntu 18.04 bionic amd64
- Packages: git emacs
In order to complete these steps, you must have followed Some Other Documentation before.
Description
GAP - Generic Attribute Profile
The Generic attribute profile takes care of discovery, security, connectivity and network technolgies of a device.
ADV_IND SCAN_REQ SCAN_RSP CONNECT_IND AUX_SCAN_REQ AUX_SCAN_RSP AUX_CONNECT_REQ AUX_CONNECT_RSP ADV_SCAN_IND
GATT - Generic Attribute Profile
As soon as two Bluetooth Low Energy devices establish a connection they can start transfering data back and forth. This data is formated into Services and Characteristics in a Server/Client relationship.
Network Topology
The network topology of GATT networks contains so-called central devices and peripheral devices. One peripheral is only connected to only one central device at a time. A central device can connect to many peripheral devices. The peripheral is also acting as the GATT server. It contains the definitions for profiles, services and characteristics of a device. The central device always initiates the data exchange.
ATT - Attribute Protocol
GATT is based on ATT. Each attribute gets it’s own Unique Identifier (UUID) here. These get formatted as characteristics and services.
Profiles
set of services per Profile Example profiles: Basic audio profile, Location and navigation profile, weight scale profile, heart rate profile
Services
A Service can have multiple characteristics. It has it’s own UUID. It has a handle. UUID, permissions, value
Characteristics
The characteristics are the lowest-level of the GATT Profiles. They also each use their own UUID. These are relevant when it comes to protecting and enhancing security of a Bluetooth Low Energy device. The characteristics have a value, properties and human-readable descriptors
BLE Operations
- Read
Read the data of a characteristic
- Write
Write data to a characteristic
- Notify
Get notifications to value changes of a device by subscribing to it
Further Context
Make sure to read
- War and Peace
- Lord of the Rings
- The Baroque Cycle
Used Hardware
Device to be used with this documentation Maybe another device to be used with this documentation
Courses
Author
Are Maksimović