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Bluetooth1 Bluetooth1 Presentation Transcript

  • Bluetooth ProtocolA Customer support preview Ehud Mantzuri
  • Bluetooth - Main properties Simple to use Short-range communications technology Operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping, full-duplex signal at a nominal rate of 1600 hops/sec. Provides developers both link layer and application layer definitions, which support data and voice applications Robustness, low power, and low cost. Enhanced Data Rate (EDR) up to 2.1 Mbps PCM digital audio/voice interface Bluetooth Protocol 2
  • Main properties Power Saving Modes (Sniff, Hold and Park) – synchronized clocks Page and inquiry scans Standard UART interface w/ Rates of up to 4Mbps Standard Host Controlled Interface (HCI) Communication error correction schemes Maintain high levels of security Ad-hoc networks known as piconets established dynamically Each device in a piconet can also simultaneously communicate with up to seven other devices within that single piconet and each device can also belong to several piconets simultaneously Bluetooth Protocol 3
  • Usage Cable Replacement  File transfer  MODEM control Wireless Sensors  Flood Alarm  Heating Control Medical Devices  Heart Rate Monitor  Blood Pressure Sensor  Blood Glucose Meter  Thermometer Bluetooth Protocol 4
  • Usage Computer Peripherals  Mouse  Printers, Scanners Consumer Devices  Phones, PDAs  Earphones  fitness sensors  Watches  Toys  Entertainment Devices  Personal Navigation Devices Automotive Applications Bluetooth Protocol 5
  • Profiles SDAP – Service Discovery Application Profile FTP – File Transfer Profile SPP – Serial (virtual COM) Port Profile DUN – DialUp Networking - may be accessed using a simple AT command set. HDP – Health Device Profile HSP – HeadSet Profile HFP - Handsfree Profile A2DP - Advanced Audio Distribution Profile AVRCP - A/V Remote Control Profile HID – Human Interface Device OBEX – Object Exchange OPP – Object Push Profile CTP - Coredless Telephony BPP – Basic Printer Profile BIP – Basic Imaging Profile And many more … Bluetooth Protocol 6
  • Core Block Diagram Bluetooth Protocol 7
  • Core Architecture Blocks Bluetooth Protocol 8
  • Core Architecture Blocks Bluetooth Protocol 9
  • HCI Transport Layer Allows control over the BT Device Full Uart HW flow control Transports  Commands  Events  ACL  synchronous data  Vendor specific  SCO, eSCO between the Bluetooth device and its host using HCI data packets (Not between devices) Bluetooth Protocol 10
  • Pairing Provides Trust, Authorization, and Authentication Each side can declare own security level and request compliance from the other side Upon completing the pairing process, the device may wish to enable the user to "Trust" the device and services. the device is added to the users Trusted Devices list and the said device will be allowed to reconnect the device may be visible or non-visible and also connectable or not-connectable Bluetooth Protocol 11
  • Application - SPPSPP defines how to set up virtual serial ports and connecttwo Bluetooth enabled devices Bluetooth Protocol 12
  • Application - OBEXOBEX uses a client-server model and is independent of the transportmechanism and transport API Bluetooth Protocol 13
  • Profile Dependencies Bluetooth Protocol 14
  • Protocol Layers L2CAP - Logical Link Control and Adaptation Protocol SDP - Service Discovery Protocol RFCOMM Bluetooth Protocol 15
  • L2CAP Provides  higher level protocol multiplexing,  packet segmentation and reassembly, and  the conveying of quality of service (QoS) information.  Connected to the HCI Bluetooth Protocol 16
  • RFCOMM Emulates the serial cable line (9-Pin) settings and status of an RS-232 serial port and is used for providing serial data transfer. Connects to the lower layers of the Bluetooth protocol stack through the L2CAP layer supports up to 60 simultaneous connections between two BT devices Bluetooth Protocol 17
  • SDP Provides a means for applications to discover which services are available on the remote side and to determine the characteristics of those available services. Bluetooth Protocol 18
  • STACK Layers Bluetooth Protocol 19
  • STACK Layers Physical link  A baseband connection between Bluetooth enabled devices.  A physical link is always associated with exactly one physical channel  Stateless/connectionless - has no direct representation within the structure of a transmitted packet. The access code packet field, together with the clock and address of the master Bluetooth device, are used to identify a physical channel.  may be active (a default ACL logical transport exists) or parked (synchronized in the piconet but has no default ACL). Bluetooth Protocol 20
  • Logical Links Logical Links and Logical Transports  A variety of logical links are available to support different application data transport  Each logical link is associated with a logical transport - flow control, acknowledgement/repeat mechanisms, sequence numbering and scheduling behavior.Has 3 categories:  Casting  Scheduling and Acknowledgement Scheme  Class of Data Bluetooth Protocol 21
  •  Casting  Unicast  connection-oriented - connection procedure takes place before the link may be used.  Traffic may be sent in either direction  Broadcast  Connectionless - no procedure to create these links, and data may be sent over them at any time  exist between one source device and zero or more receiver devices  Traffic is unidirectional Bluetooth Protocol 22
  • Logical Links Scheduling and Acknowledgement Scheme  Synchronous  associating the Bluetoothpiconet clock with the transported data.  transporting data that has no time-based characteristics.  The data is normally expected to be retransmitted until successfully received  Isochronous  transporting data that has time-based characteristics.  retransmitted until received or expired  Asynchronous  transporting data that has no time-based characteristics.  The data is retransmitted until successfully received  The data rate on the link need not be constant Bluetooth Protocol 23
  • Logical Links Class of Data  Control links  transporting LMP messages between two link managers  invisible above the baseband layer, and cannot be directly instantiated, configured or released by applications,  always takes priority over the L2CAP link traffic.  L2CAP links  Transport L2CAP PDUs, which may carry the L2CAP signaling channel or framed user data  May be fragmented  Stream links  Transport user data that has no inherent framing that should be preserved when delivering the data.  Lost data may be replaced by padding at the receiver Bluetooth Protocol 24
  • Logical Transport ACL - Asynchronous Connection-Oriented  Reliable or time-bounded, bi- directional, point-to-point. SCO - Synchronous Connection-Oriented  Bi-directional, symmetric, point-to-point, AV channels. Used for 64Kb/s constant rate data. eSCO - Extended Synchronous Connection-Oriented  Bi-directional, symmetric or asymmetric, point-to-point, general regular data, limited retransmission. Used for constant rate data synchronized to the master Bluetooth clock. ASB - Active slave broadcast  Unreliable, uni-directional broadcast to any devices synchronized with the physical channel. Used for broadcast L2CAP groups. PSB – Parked slave broadcast  Unreliable, uni-directional broadcast to all piconet devices. Used for LMP and L2CAP traffic to parked devices, and for access requests from parked devices. Bluetooth Protocol 25
  • LMPThe Link Manager Protocol contains PDUs (Protocol Data Units) Implemented as firmware in BT deviceEnabling the following messages between two devices: Connection Control  Connection Establishment  Detach  Power control  Adaptive frequency hopping  Channel quality driven data rate change  Quality of service (QoS)  Paging scheme parameters  Control of multi-slot packets  Enhanced Data Rate  Encapsulated LMP PDUs Bluetooth Protocol 26
  • LMP Security  Role Switch  Authentication  Slot Offset  Pairing  Role Switch  Change Link Key  Modes of Operation  Change Current Link Key Type  Hold Mode  Encryption  Park Stats  Request Supported Encryption  Sniff Mode Key Size  Logical Transports  Secure Simple Pairing  SCO Logical Transport Informational Requests  eSCO Logical Transport  Timing Accuracy  Test Mode  Clock Offset  Activation and Deactivation of Test  LMP Version  Control of Test Mode  Supported Features  Name Request Bluetooth Protocol 27
  • SnifferBluetooth Protocol 28
  • Network Bluetooth nodes can work together to establish a multi-hop network Each Bluetooth device is allocated a unique 48-bit Bluetooth device address (BD_ADDR) obtained from the IEEE Registration Authority Bluetooth Protocol 29
  • NetworkPiconets with a single slave operation (a), a multi-slave operation(b) and a scatternet operation (c). Bluetooth Protocol 30
  • scatternet A group of piconets in which connections consists between different piconets Bluetooth Protocol 31
  • Bluetooth SIG - Special Interest Group The Bluetooth Qualification Program The purpose of the Bluetooth Qualification Program is to  promote interoperability,  verify conformance to the Bluetooth specifications,  enforce compliance,  grant IP license,  recognize members who meet a high standard of testing. Requires certain testing standards for all designs and products which use the Bluetooth. Bluetooth Protocol 32
  • Create a Test Plan STEP 1: Create/Select a Project STEP 2: Declaration Summary allows you to choose which layers you will be supporting. STEP 3: Edit Core PICS The Core PICS consist of (RF), (BB), (LMP), (L2CAP), (SDP), and (GAP). mandatory requirements of these layers must be supported. STEP 4: Edit Profile PICS Any profiles that your product contains can be edited here. STEP 5: Consistency Check a static consistency check needs to be performed to ensure that the proper features are supported. Many features have prerequistes, dependencies, or groupings that are required if they are supported. STEP 6: Generate the Test Plan Bluetooth Protocol 33
  • PICSBluetooth Protocol 34
  • PICSBluetooth Protocol 35
  • Bluetooth Profile Tuning Suite (PTS) The OTS is a PC-based test tool created by the Bluetooth SIG for its members. The PTS automates protocol and profile testing producing more accurate, higher quality test results and improved interoperability for allproducts. The PTS uses Executable Test Suite (ETS) files to exercise an IUT. There is one ETS file per profile/protocol and each file contains a series of test cases The PTS tool contains an easy-to-use XML based test report generator Bluetooth Protocol 36
  • PTSBluetooth Protocol 37
  • HID Dongle – SW Example The initialization of the application occurs in two phases: first, the hidappInit function is called that when ends sets an HIDAPP_EVT_START event This triggers the second phase of the initialization, which can be found within the main event processing function hidappProcessEvent function. The HIDDongle application contains two callback functions: hidappKeyCback and centralEventCB. Bluetooth Protocol 38
  • Sources Bluetooth SIG - Texas Instruments -  Wireless Connectivity > Bluetooth technology Bluetooth Protocol 39