Chapter 7 Using Bluetooth
Introduction
Bluetooth-equipped devices can communicate wirelessly, using frequency-hopping spread spectrum (FHSS) RF to
transmit and receive data in the 2.4 GHz Industry Scientific and Medical (ISM) band (802.15.1). Bluetooth wireless
technology is specifically designed for short-range (30 feet/10 meters) communications and low power
consumption.
Vehicle computers with Bluetooth capabilities can exchange information (e.g., files and tasks) with other Bluetooth
enabled devices such as scanners and printers.
Vehicle computers with Bluetooth technology use the StoneStreet One Bluetooth stack. To program Bluetooth
within the vehicle computer refer to the StoneStreet One SDK.
Adaptive Frequency Hopping
Adaptive Frequency Hopping (AFH) is a method of avoiding fixed frequency interferers. AFH can be used with
Bluetooth voice. All devices in the piconet (Bluetooth network) must be AFH-capable in order for AFH to work.
There is no AFH when connecting and discovering devices. Avoid making Bluetooth connections and discoveries
during critical 802.11b/g/n communications. AFH for Bluetooth can be broken-down into four main sections:
• Channel Classification - A method of detecting an interference on a channel-by-channel basis, or pre-defined
channel mask.
• Link Management - Coordinates and distributes the AFH information to the rest of the Bluetooth network.
• Hop Sequence Modification - Avoids the interference by selectively reducing the number of hopping
channels.
• Channel Maintenance - A method for periodically re-evaluating the channels.
NOTE For instructions how to connect cordless (Bluetooth) scanners, refer to Chapter 5, TelnetCE Configuration.
NOTE To switch to Microsoft Bluetooth stack, refer to Switch Between Microsoft and StoneStreet One (SS1)
Bluetooth Stack on page 11-3.
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