Bluetooth

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BT Antenna Position (CUH-1115A)

Bluetooth[edit]

Bluetooth.png Bluetooth is a wireless technology for creating personal area networks operating in the 2.4 GHz unlicensed band, with a default range of 10 meters.

An overview of Bluetooth:

Bluetooth radio[edit]

Bluetooth 2.0 uses frequencies between 2.4000 and 2.4835 GHz, and divides the band into 79 MHz channels (numbered 0-78), with frequency hopping at a rate of 1600 times per second. Channel 0 has a frequency centred at 2.4020 GHz, allowing a lower guard band of 2 MHz. Channel 78 has a frequency centred at 2.4800 GHz, allowing an upper guard band of 3.5 MHz. Bluetooth devices are divided into three classes, depending on their maximum transmitted power (and hence their maximum range):

Class Power Range
Class 1 100mW
(20 dBm)
100m
(325ft)
Class 2 2.5mW
(4 dBm)
10m
(32ft)
Class 3 1mW
(0 dBm)
1m
(3ft)

Overlapping channels BT/WiFi[edit]

Center Frequency
(2.4xx Ghz)
BT 2.0
Channel
BT 4.0
Channel
WiFi channel
(center freq. in GHz)
00 Guard Guard
01 1
(2.412)
02 0 0
03 1
04 2 1
05 3
06 4 2 2
(2.417)
07 5
08 6 3
09 7
10 8 4
11 9 3
(2.422)
12 10 5
13 11
14 12 6
15 13
16 14 7 4
(2.427)
17 15
18 16 8
19 17
20 18 9
21 19 5
(2.432)
22 20 10
23 21
24 22 11
25 23
26 24 12 6
(2.437)
27 25
28 26 13
29 27
30 28 14
31 29 7
(2.442)
32 30 15
33 31
34 32 16
35 33
36 34 17 8
(2.447)
37 35
38 36 18
39 37
40 38 19
41 39 9
(2.452)
42 40 20
43 41
44 42 21
45 43
46 44 22 10
(2.457)
47 45
48 46 23
49 47
50 48 24
51 49 11
(2.462)
52 50 25
53 51
54 52 26
55 53
56 54 27 12
(2.467)
57 55
58 56 28
59 57
60 58 29
61 59 13
(2.472)
62 60 30
63 61
64 62 31
65 63
66 64 32
67 65
68 66 33
69 67
70 68 34
71 69
72 70 35
73 71
74 72 36
75 73
76 74 37
77 75
78 76 38
79 77
80 78 39
81 Guard
82 Guard
83

Bluetooth connection[edit]

The number of Bluetooth® devices you can connect at the same time depends on the Bluetooth® devices.

There are three type of connections in Bluetooth:

  • Single-slave: a point-to-point connection (only 2 Bluetooth units involved)
  • Piconet: One Bluetooth unit acts as the master of the piconet, whereas the (up to seven active) others units acts as slaves.
  • Scatternet: Multiple piconets with overlapping coverage areas form a scatternet.

Device icons[edit]

Shows the types of found Bluetooth® devices using icons.

Icon Device PS4 logomini.gif
Icon game controller.png DUALSHOCK™4 wireless controller or other controller Yes
Icon ps move.png PlayStation®Move motion controller Yes
Icon computer.png Computer Yes
Icon phone.png Mobile phone, smartphone Yes
Icon party.png Headset Yes
Icon speaker.png Speakers Yes
Icon mouse.png Mouse Yes
Icon keyboard.png Keyboard Yes
Icon printer.png Printer Yes

Bluetooth Adressing[edit]

Each Bluetooth unit has a unique 48-bit address (BD_ADDR).

Company_assigned Company_id
Lower Adress Part (24-bit)
transmitted with every packet as part of the packet header
Upper Adress Part (8-bit)
Non-Significant Adress Part (16-bit)
assigned publicly by the IEEE
lsbxxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxx xxxxmsb

Class of Device/Service (CoD)[edit]

In practice, most Bluetooth clients scan their surroundings in two successive steps: they first look for all bluetooth devices around them and find out their "class". You can do this on Linux with the hcitool scan command. Then, they use SDP in order to check if a device in a given class offers the type of service that they want.

The PS4 has a class of Device/Service (CoD) of 0x2c0100:

  • Major Service Class: Audio (0x200000)
  • Major Service Class: Capturing (0x80000)
  • Major Service Class: Rendering (0x40000)
  • Major Device Class : Computer (0x100)

(Online Generator http://bluetooth-pentest.narod.ru/software/bluetooth_class_of_device-service_generator.html)

(The dualshock 4 in a game controller mode has a class of Device/Service (CoD) of 0x002508.

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