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BlueZ settings storage
**********************
Purpose
=======
The purpose of this document is to describe the directory structure of BlueZ
settings storage. In effect, this document will serve as the primary, up to
date source of BlueZ storage information. It is intended for developers,
managers and users needing to understand the storage directory.
Adapter and remote device info are read form the storage during object
initialization.
Write to storage is performed immediately on every value change.
Default storage directory is /var/lib/bluetooth.
All files are in ini-file format.
Storage directory structure
===========================
There is one directory per adapter, named by its bluetooth address, which
contains:
- a settings file for the local adapter
- an attributes file containing attributes of supported LE services
- a cache directory containing:
- one file per device, named by remote device address, which contains
device name
- one directory per remote device, named by remote device address, which
contains:
- an info file
- an attributes file containing attributes of remote LE services
So the directory structure is:
/var/lib/bluetooth/<adapter address>/
./settings
./attributes
./cache/
./<remote device address>
./<remote device address>
...
./<remote device address>/
./info
./attributes
./<remote device address>/
./info
./attributes
...
Settings file format
====================
Settings file contains one [General] group with adapter info like:
Name String Friendly name advertised for
this adapter
Discoverable Boolean Discoverability of the adapter
Connectable Boolean Connectability of the adapter
Pairable Boolean Can the adapter accept pairing
request ?
Powered Boolean Is the adapter powered ?
PairableTimeout Integer How long to stay in pairable mode
before going back to non-pairable.
The value is in seconds.
0 = disable timer, i.e. stay
pairable forever
DiscoverableTimeout Integer How long to stay in discoverable mode
before going back to non-discoverable.
The value is in seconds.
0 = disable timer, i.e. stay
discoverable forever
Sample:
[General]
Name=My PC
Discoverable=false
Connectable=true
Pairable=true
Powered=true
DiscoverableTimeout=0
Attributes file format
======================
The attributes file lists all attributes supported by the local adapter or
remote device.
Attributes are stored using their handle as group name (decimal format).
Each group contains:
UUID String 128-bit UUID of the attribute
Value String Value of the attribute as hexadecimal encoded
string
Sample:
[1]
UUID=00002800-0000-1000-8000-00805f9b34fb
Value=0018
[4]
UUID=00002803-0000-1000-8000-00805f9b34fb
Value=020600002A
[6]
UUID=00002a00-0000-1000-8000-00805f9b34fb
Value=4578616D706C6520446576696365
Cache directory file format
============================
Each file, named by remote device address, contains one [General] group.
This general group contains:
Name String Remote device friendly name
ShortName String Remote device shortened name
Info file format
================
Info file may includes multiple groups (General, Device ID, Link key and
Long term key) related to a remote device.
[General] group contains:
Name String Remote device friendly name
Alias String Alias name
Class String Device class in hexadecimal,
i.e. 0x000000
SupportedTechnologies List of List of technologies supported by
strings device, separated by ";"
Technologies can be BR/EDR or LE
AddressType String An address can be "static" or "public"
Trusted Boolean True if the remote device is trusted
Blocked Boolean True if the remote device is blocked
Profiles List of List of profiles advertised by remote,
strings in 128-bits UUID format, separated by
";"
[DeviceID] group contains:
Source Integer Assigner of Device ID
Vendor Integer Device vendor
Product Integer Device product
Version Integer Device version
[LinkKey] group contains:
Key String Key in hexadecimal format
Type Integer Type of link key
PINLength Integer Length of PIN
[LongTermKey] group contains:
Key String Long term key in hexadecimal format
Authenticated Boolean True if remote device has been
authenticated
EncSize Integer Encrypted size
EDiv Integer Encrypted diversifier
Rand Integer Randomizer
|
