1 Mini Course Programming Context-aware Mobile Phones Thomas Bodin IT University of Copenhagen

2 Tuesday agenda  General Bluetooth concepts  Definition  Overview  Core specifications  Introduction to BlipNet API

3 General Bluetooth concepts  Definition  A short-range wireless communication technology for voice and data. Bluetooth communicates via a frequency hopping transceiver in the ISM band. It is based on a low-cost short-range radio link facilitating protected ad hoc connections for stationary and mobile communication.

4 General Bluetooth concepts  Overview  The Bluetooth wireless connectivity technology was originally envisioned in 1994 by the Swedish phone equipment maker Ericsson as a way for mobile devices to communicate with each other at short ranges -- up to 30 feet, or 10 meters. In 1998, Ericsson, IBM, Intel, Nokia, and Toshiba formed the Bluetooth Special Interest Group consortium to develop a royalty-free, open specification for short- range wireless connectivity. Since then, more than 2000 companies have joined the Bluetooth SIG, including virtually all manufacturers of phone, computer, and PDA equipment.

5 General Bluetooth concepts  Core specifications  2.4 GHz ISM Open band  Bluetooth divides the 2.4 GHz frequency band into 79 channels 1 MHz apart (from to GHz),  The frequency hopping is carried out up to 1600 times a second  10 cm-10 meters range (can be extended to 100 m)  8 active devices per piconet (share datarate)  Up to 10 piconets in bubble (full datarate)  1 Megabyte per second gross rate  Bluetooth defines provisions for three low-power operating modes in order to conserve battery life: sniff, park and hold mode

6 General Bluetooth concepts  Core specifications (continued)  vs  While both Bluetooth and IEEE b are wireless communication protocols and both operate in the 2.4GHz band, it is important not to visualize Bluetooth as a replacement for wireless LAN technology.  The b protocol is designed to connect relatively large devices with lots of power and speed, such as desktops and laptops. Devices communicate at up to 11 Mbit/sec, at greater distances (up to 300 feet, or 100 meters). By contrast, Bluetooth is designed to connect small devices like PDAs, mobile phones, and peripherals at slower speeds (1 Mbit/sec), within a shorter range (30 feet, or 10 meters), which reduces power requirements.

7 General Bluetooth concepts RF BB LMP HCI L2CAP SDPRFCOMMBNEPTCS OBEX PPP IP

8 General Bluetooth concepts  The radio layer is the physical wireless connection  The baseband layer is responsible for controlling and sending data packets over the radio link  The baseband layer maintains Synchronous Connection-Oriented (SCO) links for voice and Asynchronous Connectionless (ACL) links for data  The Link Manager Protocol (LMP) uses the links set up by the baseband to establish connections and manage piconets.  The Host Controller Interface (HCI) is the dividing line between software and hardware.  The Logical Link Control and Adaptation Protocol (L2CAP) receives application data and adapts it to the Bluetooth format

9 General Bluetooth concepts Profile RF BB LMP HCI L2CAP SDPBNEPTCSRFCOMM OBEX PPP IP

10 Service Discovery Application Profile Service Search LAN Access Profile, Object Push Profile PAN Profile (NAP) Service Search Service Search RF BB LMP L2CAP SDPBNEPTCSRFCOMM OBEX PPP IP SDAP Profile

11 Serial Port Profile AT Command RF BB LMP L2CAP SDPBNEPTCSRFCOMM OBEX PPP IP SPP Profile Serial cable replacement Basis profile for a series of other profiles Can be applied directly for data communication

12 Dial-Up Networking Profile DUN- GW DUN Client Internet RF BB LMP L2CAP SDPBNEPTCSRFCOMM OBEX PPP IP Dial-UP Networking Profile Cellular phone acts a wireless modem for connecting to a dial-up internet access server etc.

13 Object Push Profile RF BB LMP L2CAP SDPBNEPTCSRFCOMM OBEX PPP IP OPP Profile Buisness Card Ericsson Bluetooth Networks Business Card Mr Smith Street X, Town Y Sound Image Video Game

14 BlipServer  Configuration and management of BlipNodes  Central security handler  Link and session establishment controller  Payload gateway for OBEX and SPP data  Linux and Windows  BlipNet API  BlipServer configuration via BlipManager

15 BlipManager  Graphical configuration and monitoring of the BlipServer and BlipNodes  Presets for standard configuration  Configuration wizards  Configuration groups  Central controlled security

16 BlipNet API  An Open RMI based Java API  Monitoring of BlipNet (Event and Poll based)  Configuration of dynamic BlipNode settings  Send/Receive objects (OBEX)  Send/Receive serial data  Dynamic Class loading  Inquiry start/stop from API  Friendly Name lookup event