Static Bluetooth PIN codes

Bluetooth devices that have no means for PIN code input
come with a hard-coded PIN to use when pairing with another device.

The primary authentication mechanism used in Bluetooth devices is a PIN,
between 1 and 16 characters in length, that is used to authenticate a
device for the first time. However, many Bluetooth devices have no means
for inputting a user-defined PIN code when pairing with another device,
due to the lack of a man-machine interface (MMI) such as a numeric keypad
or keyboard. This is especially prevalent in Bluetooth headsets,
pointing devices, headphones, and speakers.

To get around this limitation, such devices make use of a hard-coded
PIN that may be entered into a peer device when pairing is initiated.
This itself is not a problem. However, many of these devices use
the same PIN code for every unit of a particular model of device
that is produced. Thus, it is trivial for someone to guess the
PIN used by one of the affected devices for a pairing with any
given device based on its make and model. Once someone has
determined the correct PIN, they can use it to gain unauthorized
access to the vulnerable device.

### meanings:
 "I" means that device must be placed in "pairing mode" to see it.
 "S" means that device must be placed in "pairing mode" to pair,
 otherwise if you know its BD_ADDR and PIN you may pair fo free.

DEVICE                PIN   TYPE     ###
Anycom Stereo Headset 0000  Headset  I
Audi UHV *            1234  Car Kit  ?
Jabra BT110           0000  Headset  I,S
Jabra BT800           0000  Headset  I,S
Jabra BT2040          0000  Headset  I,S
Plantronics M2500     0000  Headset  I
Plantronics Expl 220  0000  Headset  ?
Motorola H670         0000  Headset  ?
Motorola HS820        0000  Headset  I,S