Wireless
13
Pairing of Bluetooth devices is accomplished by creating an initialization key used to authenticate the
devices and create a link key for them. Entering a common personal identification number (PIN) in the
devices being paired generates the initialization key. The PIN is never sent over the air. By default, the
Bluetooth stack responds with no key when a key is requested (it is up to user to respond to the key
request event). Authentication of Bluetooth devices is based-upon a challenge-response transaction.
Bluetooth allows for a PIN or passkey used to create other 128-bit keys used for security and encryption.
The encryption key is derived from the link key used to authenticate the pairing devices. Also worthy of
note is the limited range and fast frequency hopping of the Bluetooth radios that makes long-distance
eavesdropping difficult.
Recommendations are:
• Perform pairing in a secure environment
• Keep PIN codes private and do not store the PIN codes in the device
• Implement application-level security.
Bluetooth Profiles
The device supports the Bluetooth services listed.
Table 12 Bluetooth Profiles
Profile Description
Service Discovery Protocol
(SDP)
Handles the search for known and specific services as well as
general services.
Serial Port Profile (SPP) Allows use of RFCOMM protocol to emulate serial cable
connection between two Bluetooth peer devices. For example,
connecting the device to a printer.
Object Push Profile (OPP) Allows the device to push and pull objects to and from a push
server.
Advanced Audio Distribution
Profile (A2DP)
Allows the device to stream stereo-quality audio to a wireless
headset or wireless stereo speakers.
Audio/Video Remote Control
Profile (AVRCP)
Allows the device to control A/V equipment to which a user has
access. It may be used in concert with A2DP.
Personal Area Network (PAN) Allows the use of Bluetooth Network Encapsulation Protocol to
provide L3 networking capabilities over a Bluetooth link. Only
PANU role is supported.
Human Interface Device Profile
(HID)
Allows Bluetooth keyboards, pointing devices, gaming devices and
remote monitoring devices to connect to the device.
Headset Profile (HSP) Allows a hands-free device, such as a Bluetooth headset, to place
and receive calls on the device.
Hands-Free Profile (HFP) Allows car hands-free kits to communicate with the device in the
car.
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General
Weight and Dimensions
