Bluetooth

Introduction

Bluetooth is an industrial specification for wireless personal area networks (PANs). Bluetooth provides a way to connect and exchange information between devices such as mobile phones, laptops, PCs, printers, digital cameras, and video game consoles over a secure, globally unlicensed short-range radio frequency.

Protocols

• L2CAP - Logical Link Control and Adaptation Protocol is used within the Bluetooth protocol stack. It passes packets to either the Host Controller Interface (HCI) or on a hostless system, directly to the Link Manager. L2CAP is used to communicate over the host ACL (Asynchronous Connectionless) link. Its connection is established after the ACL link has been setup.
• RFCOMM is the abbreviation for Radio Frequency Communication. The Bluetooth protocol RFCOMM is a simple set of transport protocols, made on top of the L2CAP protocol, providing emulated RS-232 serial ports (up to sixty simultaneous connections of a bluetooth device at a time).

Tango Device Server settings

#---------------------------------------------------------
# SERVER Bluetooth/gumstix, Bluetooth device declaration
#---------------------------------------------------------
Bluetooth/gumstix/DEVICE/Bluetooth: "gumstix/bluetooth/1"

Device Server

Attributes

• Protocol (RFCOMM / L2CAP)

Commands

• GetAdapters
• Receive
• Send

Implementation

• BlueZ development libraries were used.
• add headers:

#include <bluetooth/bluetooth.h>
#include <bluetooth/hci.h>
#include <bluetooth/hci_lib.h>
#include <bluetooth/rfcomm.h>

#include <bluetooth/l2cap.h>

• to build the device server, it has to be link against libbluetooth