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Change Log

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

Unreleased

Added

Fixed

  • HFP: use 'don't care' to accept SCO connections, fixes issue on ESP32
  • HFP: fix LC3-WB init

Changed

Release v1.5.6

Added

  • HCI: HCI_ACL_CHUNK_SIZE_ALIGNMENT allows to keep HCI transport writes aligned
  • GAP: support additional LE PHYs for scanning and outgoing connections
  • GATT Client: allow to queue requests with gatt_client_request_to_send_gatt_query and gatt_client_request_to_write_without_response
  • GATT Client: support GATT over BR/EDR transport via gatt_client_classic_connect
  • HFP: provide SCO packet types and rx/tx packet lengths in HFP_SUBEVENT_AUDIO_CONNECTION_ESTABLISHED
  • HFP: allow to register custom at commands with hfp_hf_register_custom_at_command
  • HFP: experimental support for LC3-SWB from HFP SWB draft with ENABLE_HFP_SUPER_WIDE_BAND_SPEECH
  • AVRCP: support Cover Art via avrcp_cover_art_client
  • example: gatt_streamer_server and le_streamer_client report DLE and PHY changes
  • NXP: support for NXP Controller with bootloader versions v1, e.g. NXP 88W8997, and v3, e.g. NXP IW416 or IW61x
  • esp32: support esp-idf v5.x audio driver
  • esp32: warn about sdkconfig issues
  • esp32: add BTstack component config options via menuconfig
  • esp32: allow to disable default audio i2s driver via component config
  • esp32: btstack_stdio_init configures buffered output, required for stdin support
  • Port for Renesas RA6M4 with DA14531
  • Port for NXP Controller on POSIX (posix-h4-nxp)
  • Port for newer Infineon Controller on POSIX (posix-h4-bcm) that requires autobaud-mode

Fixed

  • HCI: fix set extended scan response
  • HCI: fix report of extended advertisements with data len > 31
  • HCI: fix CTKD in Initiator role over BR/EDR SC when using dedicated bonding
  • SM: fix value in SM_EVENT_NUMERIC_COMPARISON_REQUEST
  • SM: ignore Security Request during re-encryption
  • GATT Client: return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER for invalid connection handle
  • A2DP: emit A2DP_SUBEVENT_STREAM_ESTABLISHED with if connection fails, e.g. because of Page Timeout
  • A2DP Source: a2dp_source_stream_send_media_payload was removed, use a2dp_source_stream_send_media_payload_rtp instead
  • A2DP: use samples as timestamp, fixes issue with Apple Airpods Pro 2nd Gen
  • AVDTP Source: avdtp_source_stream_send_media_payload was removed, use avdtp_source_stream_send_media_payload_rtp instead
  • AVRCP: re-register for notification
  • HFP: fix setup/accept of synchronous connection
  • HFP: use mandatory safe settings considering BR/EDR Secure Connections to accept synchronous connections
  • HFP: avoid SCO packet types not supported either locally or remotely
  • HFP: remove trailing newline/carriage return in custom command event
  • PBAP Client: make pbap_set_property_selector work for Pull Phonebook
  • btstack_stdin_embedded: use timer to poll RTT input, fix for tickless RTOS
  • esp32: fix audio power amplifier control on Lyra T v4.3 board
  • tool/convert_gatt_service: removed as GATT Service descriptions not available on Bluetooth SIG web site

Changed

  • GAP: add gap_set_peer_privacy_mode with default LE_PRIVACY_MODE_DEVICE
  • GAP: use stack defaults for LE Connection Parameter Updates
  • GAP: set minimum and maximum CE length to 0
  • GAP: ENABLE_EXPLICIT_DEDICATED_BONDING_DISCONNECT disables disconnect after dedicated bonding
  • GOEP Client: support multiple instances
  • A2DP Sink: drop unused local seid argument in a2dp_sink_establish_stream
  • HFP: emit HFP_SUBEVENT_CUSTOM_AT_MESSAGE_SENT after sending custom command / unsolicited response code
  • sco_demo_util: replace hfp_msbc by hfp_codec
  • BCM: look for PatchRAM file with prefix DEVICE_NAME and extension '.hcd'
  • bluetooth: indicated identity address in resolved address type enums name
  • btstack_audio: added get_samplerate function to help with audio sample rate synchronization
  • btstack_flash_bank: write empty tag instead of overwriting existing tag with ENABLE_TLV_FLASH_WRITE_ONCE
  • esp32: drop support for Makefile projects from esp-idf 3.x
  • esp32: avoid deprecated btstack_run_loop_freertos API calls
  • esp32: use sample rate compensation in a2dp_sink_demo
  • stm32-f4discovery-cc256x: use external oscillator for better I2S clock
  • stm32-f4discovery: use sample rate compensation in a2dp_sink_demo

Release v1.5.5

Added

  • hci_dump_stdout: allow to truncate ACL, SCO and ISO packets with HCI_DUMP_STDOUT_MAX_SIZE_*
  • GATT Service: Broadcast Audio Scan Service Server and Client (BASS 1.0)
  • example/a2dp_source_demo: add command to scan and connect to Bluetooth speaker by class of device

Fixed

  • GAP: reload LE Resolving List after power-cycle
  • GAP: fix setting of LE Scan Response for data that needs to be fragmented
  • SM: fix pairing process with active ATT communication
  • ESP32: fix init for BR/EDR Only mode
  • ESP32: fix audio driver for sink + source mode
  • ESP32: fixes for ESP-IDF v5.x
  • ESP32: fix compile of non-BTstack examples after adding components/btstack

Changed

  • GAP: reload LE Filterlist and Periodic Advertiser List after power-cycle
  • SM: delete bonding information for existing device with BD_ADDR on new pairing with different IRK
  • Mesh: move GATT Services into src/mesh/gatt-service
  • LE Audio: move GATT Services into src/le-audio/gatt-service
  • libusb: improve implementation

Known Issues

  • ESP32: audio driver for ES8388/LyraT v4.3 not updated for esp-idf 5.x

Release v1.5.4

Added

  • HFP HF: send custom AT command with hfp_hf_send_at_command
  • HFP HF: terminate held calls with hfp_hf_terminate_held_calls
  • HFP HF: provide Call Waiting information alpha field
  • HFP HF: add hfp_hf_set_default_microphone_gain and hfp_hf_set_set_default_speaker_gain for SLC
  • HFP AG: support handling of custom AT commands with hfp_ag_register_custom_at_command
  • HFP AG: send custom unsolicited result code with hfp_ag_send_unsolicited_result_code
  • GAP: allow to enable duplicate filter for LE scanning with gap_set_scan_duplicate_filter
  • GAP: support BIG with gap_big_create and gap_big_terminate
  • GAP: support BIG Sync gap_big_sync_create and gap_big_sync_terminate
  • GAP: support Periodic Advertisement Sync Transfer
  • port: CMake build files in all windows-* ports allow to use Visual Studio 2022
  • embedded audio: mono audio is played on both channels if HAVE_HAL_AUDIO_SINK_STEREO_ONLY is defined
  • Support for ESP32-C3 and ESP32-S3

Fixed

  • HCI: only add paired LE devices with IRK to resolving list
  • HCI: send HCI LE Create Connection Cancel only once for outgoing LE connections without whitelist
  • GAP: use static random address after power up
  • L2CAP: fix L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST
  • SM: avoid potential loop during CTKD

Changed

  • HCI Dump: provide log level to log_message implementation
  • GAP: replace BTSTACK_EVENT_DISCOVERABLE_ENABLED with BTSTACK_EVENT_SCAN_MODE_CHANGED

Release v1.5.3

Added

  • GAP: support periodic advertising with ENABLE_LE_PERIODIC_ADVERTISING
  • GAP: support periodic inquiry mode with gap_inquiry_periodic_start
  • HFP HF: provide Calling Line Identification alpha field
  • HFP HF: emit HFP_SUBEVENT_TRANSMIT_DTMF_CODES after sending DTMF command
  • GOEP Server
  • Chipset: support for firmware download and configuration of Realtek Controllers

Fixed

  • GAP: fix gap_connect_cancel for gap_connect_with_whitelist
  • GAP: fix race condition that causes duplicate authenticate request
  • SM: address update for non-resolvable private addresses
  • SM: reset state on power off transition
  • L2CAP: Fix accept incoming ERTM connection when Information Request already complete
  • A2DP Sink: fix config API for AAC, ATRAC, and other codecs
  • HFP: try next link setting for SCO connection failure after SCO reject errors
  • HFP AG: activate all AG indicators upon service level connection establishment
  • HFP AG: handle call termination in alerting call state
  • HFP HF: fix parsing of phone number for voice tag
  • HFP HF: report HFP_SUBEVENT_NETWORK_OPERATOR_CHANGED event

Changed

  • HCI: use ERROR_CODE_CONNECTION_REJECTED_DUE_TO_SECURITY_REASONS to rejected classic connections
  • SM: pairing events indicate if LE Secure Connection will be used
  • A2DP: new a2dp.c contains shared code of Sink and Source roles
  • A2DP Sink: automatically configure stream endpoint for outgoing connections
  • HFP AG: drop unused number parameter from hfp_ag_outgoing_call_initiated
  • libusb: command line options to delete TLV and specify log file path
  • Windows: native implementations of btstack_tlv_window, hci_dump_windows_fs, hci_dump_window_stdout

Release v1.5.2

Added

  • GAP: ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS serializes Inquiry, Remote Name Request and Create Connection operations
  • GAP: support extended advertising with ENABLE_LE_EXTENDED_ADVERTISING
  • GAP: gap_enable_link_watchdog() uses automatic flush timeout to disconnect if data cannot be sent
  • GAP: gap_secure_connections_active() to query if BR/EDR Secure Connecions are possible
  • ATT DB: provide gatt_server_get_handle_range_for_service_with_uuid16 to find included service within handle range
  • GATT Service: Audio Input Control Service Server (AICS 1.0)
  • GATT Service: Microphone Control Service Server (MCS 1.0)
  • GATT Service: Volume Control Service Server (VCS 1.0)
  • GATT Service: Volume Offset Control Service Server (VOCS 1.0)

Fixed

  • POSIX: fix RTS/CTS configuration by keeping local termios copy in btstack_uart_posix
  • HCI: fix handling of HCI Connection Complete with error (regression introduced in v1.5.1)
  • GAP: disable scanning, advertising, connection before updating random address
  • GAP: fix LE Scan with whitelist
  • HFP_AG: fix tracking for call dropped during outgoing ringing
  • HFP: Free HFP Connection object on SDP error / Service not found
  • PBAP Client: emit operation complete with status OBEX_ABORTED

Changed

  • Chipset: use da145xx in folder/file/function names for Dialog Semiconductor SoCs
  • GAP: set min encryption key size during init, if supported
  • AVDTP: use BLUETOOTH_SERVICE_CLASS_AUDIO_SINK / SOURCE instead of BLUETOOTH_PROTOCOL_AVDTP in SDP queries
  • ATT Server: use uint8_t for status returns
  • libusb, POSIX and Windows ports: use '-' instead of ':' in btstack_BD_ADDR.tlv filename

Release v1.5.1

Added

  • GOEP Client: add goep_client_version_20_or_higher
  • ESP32: implement audio source

Fixed

  • PBAP Client: support disconnect while operation is ongoing
  • PBAP Client: use SRM only if GOEP v2.0 or higher connection
  • PBAP Client: emit vCard entry data as PBAP_DATA_PACKET
  • L2CAP: limit remote MTU by local tx configuration in ERTM

Changed

  • Example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation
  • ESP32: update sdkconfig for esp-idf v4.3, disable Bluedroid host stack
  • ESP32: use I2S configuration from ESP32 LyraT V4.3

Release v1.5.0

Added

  • HCI Dump: Support BTSnoop format in hci_dump_posix_fs.c for format = HCI_DUMP_BTSNOOP
  • HCI Dump RTT STDOUT: drop messages if RTT buffer is full and RTT is configured for non-blocking
  • HCI: hci_remove_event_handler to remove packet handler
  • hci_cmd: support variable length fields and arrayed parameters
  • GAP: ENABLE_EXPLICIT_LINK_KEY_REPLY allows for asynchronous link key lookup by application
  • GAP: gap_set_page_timeout to set Page Timeout
  • GAP: gap_inquiry_set_scan_activity to set Inquiry Scan Activity
  • L2CAP: emit L2CAP_EVENT_INFORMATION_RESPONSE event with extended features and fixed channels supported
  • L2CAP: support Enhanced Credit-based Flow-Control Mode for connection-oriented channels over BR/EDR/LE
  • A2DP: allow to register media codec validator for sink and source with:
    • a2dp_sink_register_media_config_validator
    • a2dp_source_register_media_config_validator
  • A2DP Sink: allow accept or reject of stream start on A2DP_SUBEVENT_START_STREAM_REQUESTED when ENABLE_AVDTP_ACCEPTOR_EXPLICIT_START_STREAM_CONFIRMATION is defined
  • OBEX: new obex_parser for chunked OBEX data
  • SM: Support Cross-Transport Key-Derivation (CTKD) of LE LTK from BR/EDR SC Link Key in Responder role
  • SM: sm_remove_event_handler to remove packet handler
  • GATT Service: Bond Management Service (BMS 1.0) Server
  • GATT Service: Microphone Control Service (MICS 1.0) Server
  • GATT Service: TX Power Service (TPS 1.0) Server
  • POSIX: btstack_signal allows to register for callback on signal, e.g. ctrl-c
  • Windows: btstack_stdin_window_register_ctrl_c_callback allows to register for ctrl-c

Fixed

  • A2DP Source: fix reconfigure
  • AVRCP Controller: prevent registering of notifications for unsupported events
  • RFCOMM: fixed handling of remote port configuration command
  • HFP AG: fix accept incoming connection while audio connection is established
  • PBAP Client: handle chunked vCard Listing
  • PBAP Client: use new streaming obex_parser to handle chunked OBEX data
  • SM: Work around for unexpected Windows 10 disconnect for BR Secure Connections (SMP over BR timeout)
  • SM: support storing bonding information for devices with identical IRK but different public addresses
  • GAP: restart advertising when private address changes
  • le_device_db_tlv: keep number of devices reported by le_device_db_count if old entry is replaced

Changed

  • Drop iOS support
  • HCI: provide status instead of undocumented int error code and bool for API functions
  • HCI: use 1000 ms watchdog to force power off for hci_power_control(HCI_POWER_OFF)
  • GAP: local name, EIR data, class of device and default link policy can be updated at any time
  • L2CAP: provide status instead of undocumented int error code and bool for API functions
  • L2CAP: remote features not required for SDP connections
  • L2CAP: replaced l2cap_register_packet_handler with l2cap_add_event_handler to register multiple handlers
  • L2CAP: drop reason parameter in l2cap_disconnect
  • L2CAP: use official terminology for L2CAP channel modes - ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE replaces ENABLE_LE_DATA_CHANNELS
  • L2CAP: unify API for can send now, request to send, and send packet and disconnect channel
  • L2CAP: unify events for can send now, packet sent, channel closed (CbM/ECBM using existing events)
  • RFCOMM: RFCOMM_EVENT_PORT_CONFIGURATION contains rfcomm_cid and remote flag, emitted for query config
  • RFCOMM: provide status instead of undocumented int error code and bool for API functions
  • RFCOMM: remote port configuration, line status, and modem status are sent by channel state machine
  • HSP: add ACL Connection to all events and BD ADDR to HSP_SUBEVENT_RFCOMM_CONNECTION_COMPLETE
  • HFP: API functions return status code if appropriate
  • HFP: removed one parameter from hfp_ag/hf_activate_voice_recognition function, introduce hfp_ag/hf_deactivate_voice_recognition instead
  • HFP: merged legacy and enhanced Voice Recognition Activation (VRA) API. If available enhanced mode will be preferred.
  • HFP: separate events for activation (HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED) and deactivation (HFP_SUBEVENT_VOICE_RECOGNITION_DEACTIVATED) instead of combined HFP_SUBEVENT_VOICE_RECOGNITION_STATUS with status field. HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED contains field "enhanced" to indicate if enhanced mode is used.
  • HFP: enhanced VRA: HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED is emitted after VRA is ready and the the audio connection is established. This simplifies HFP HF client logic, i.e. client can call hfp_hf_enhanced_voice_recognition_report_ready_for_audio directly upon reception of HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED event.
  • AVDTP: media config validator is called with preview of media codec configuration event and configured separately for sink/source
  • AVRCP: use PANEL as default unit + subunit info
  • AVRCP Controller: automatically query supported events when registering for notifications
  • AVRCP Target: cache companies and events in library and remove need to answer query in application callback. Use Bluetooth SIG as default company.
  • Run Loop: new functionality for HCI transport drivers and inter-process communication:
    • btstack_run_loop_poll_data_sources_from_irq: used to transfer control from IRQ handler to main thread/run loop
    • btstack_run_loop_execute_on_main_thread: schedule code execution on main thread from other thread
    • btstack_run_loop_trigger_exit: trigger run loop exit
  • POSIX / Windows / Raspi / Qt: use updated ctrl-c handling
  • POSIX TLV: use max value size of 2048, assert in store function if value size is larger

Release v1.4.1

Added

  • GAP: emit GAP_EVENT_PAIRING_STARTED and GAP_EVENT_PAIRING_COMPLETE

Fixed

  • GAP: store link key in hci connection struct to allow authenticate after pairing without bonding
  • GAP: avoid requesting authentication twice
  • GAP: cache own address on start advertising and connecting, provide getters
  • GAP: stop LE connecting if create connection fails (e.g. connectable adv active and multiple roles not supported)
  • SM: fix race condition between local address changes and pairing procedure
  • ATT DB: fix spelling gatt_server_get_handle_range_for_service_with_uuid128, gatt_server_get_handle_range_for_service_with_uuid16

Changed

  • HCI: update advertising data without stopping advertising first
  • GAP: Drop local bonding flag in IO Capability Reply if remote does not indicate bonding
  • GAP: return status for gap_set_security_mode
  • GAP: abort legacy pairing if Level 4 is required
  • GAP: abort SSP on IO Capabilities Request event if Level 4 is required but SC not supported by remote
  • GAP: abort SSP on User Confirmation Request event if Level 3 is required but MITM protection not possible
  • GAP: validate minimal service security level can be reached during pairing in responder role
  • L2CAP: don't trigger hci disconnect if l2cap security requirements are insufficient
  • CVE-2020-26555: reject connections to and from devices with same BD ADDR
  • CVE-2020-26555: ignore NULL link key
  • CVE-2020-26558: abort LE Secure Connection pairing if remote uses the same public key

Release v1.4

Added

  • HCI: btstack_transport_sco.h supports SCO over physical PCM/I2S interface (HAVE_SCO_TRANSPORT)
  • POSIX: btstack_transport_sco_i2s_test_bridge.c implements SCO transport interface for UART-to-I2S test bridge
  • btstack_uart: btstack_uart_t interface extends btstack_uart_block_t:
    • support sending and receiving SLIP frames for HCI H5
    • support odd parity
    • hci_transport_h4 and chipset drivers have new functions to provide btstack_uart_t
  • btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing btstack_uart_block drivers.
  • hci_transport: add parity field and pass on to btstack_uart_t in h4 and h5
  • GATT Client: Battery Service Client
  • GATT Client: Device Information Service Client
  • GATT Client: HID-over-GATT (HOG) Client, Report and Boot Host
  • GATT Client: Scan Parameters Service Client
  • GATT Server: Scan Parameters Service Server
  • GAP: support scan page configuration with gap_set_page_scan_activity and gap_set_page_scan_type
  • GAP: support sniff subrating with gap_sniff_subrating_configure
  • GAP: support QoS setup with gap_qos_set
  • AVRCP: new field button_pressed in AVRCP_SUBEVENT_OPERATION
  • AVRCP: AVRCP_SUBEVENT_OPERATION emitted for button release
  • AVRCP Controller: avrcp_controller_start_press_and_hold_cmd supports arbitrary device buttons
  • AVRCP Controller: reassemble fragmented AVCTP packets
  • AVDTP: avdtp_register_media_config_validator allows to validate media codec configuration
  • A2DP Source: ENABLE_A2DP_SOURCE_EXPLICIT_CONFIG disables auto config. requires call to a2dp_source_set_config_{CODEC}

Fixed

  • GAP: calculate IO Cap AuthReq Bondable Mode based on gap_ssp_set_authentication_requirement and gap_set_bondable_mode
  • GAP: only store link key for SSP if remote side has set bondable in io cap auth requirements
  • GAP: allow to disable link supervision timeout
  • GAP: fix gap_connect after gap_connect_cancel
  • GAP: re-configure advertisements after power cycle
  • HCI: handle start inquiry failure
  • L2CAP: fix create outgoing connection triggered from packet handler on hci disconnect event
  • L2CAP: return unknown mandatory option in config response
  • AVDTP: fix spelling avdtp_set_preferred_sampling_frequency
  • AVRCP Target: fix notification changed event
  • HFP: Emit audio connection released on SLC Release, e.g. on remote power off
  • HFP HF: fix audio connection setup if codec negotiation is supported
  • HFP HF: only emit single event for RING and AG Status updates
  • HFP AG: fix audio connection setup for in-band ringtone on incoming connection

Changed

  • Port Archive: moved ports that are not recommended for new designs to port/archive folder:
    • MSP430: the ports used the older community GCC version without 20-bit support needed for code size > 64kB
    • Broadcom/Cypress H5: uploading PatchRAM is only possible in H4 mode. It's better to also use H4 in general
    • PIC32-Harmony: the port used Harmony v1 while Harmony v3 has been out since a while
    • iOS: not supported
  • Run Loop Base: functionality used in most platform run loop implementations
    • code from btstack_run_loop_base.c moved into btstack_run_loop.c to minimize changes to build systems
    • btstack_run_loop_base.c is a placeholder and can be removed from build
  • HCI Dump: replace monolithic hci_dump.c (with many #ifdefs) into dispatcher with platform-specific implementations:
    • posix/hci_dump_posix_fs - writes binary log file
    • posix/hci_dump_stdout - log to console using printf with local system time
    • embedded/hci_dump_embedded_stdout - log to console using printf
    • embedded/hci_dump_segger_stdout - log to RTT console using SEGGER_printf
    • embedded/hci_dump_segger_binary - writes binary log over RTT to host
  • HCI: config I2S for BCM Controllers if ENABLE_SCO_OVER_PCM, reduce bit clock to 256/512 kHz
  • btstack_uart_posix: supports SLIP frames and replaces btstack_uart_block_posix
  • hci_transport_h5: more performant H5 implementation that requires btstack_uart_t driver with SLIP support
  • POSIX Ports: use new btstack_uart_posix implementation
  • posix-h5/posix-h5-bcm: use even parity for UART
  • HCI Transport: extract convenience function declaration for h4, h5, em9304_spi, and usb into separate hci_transport_{type}.h
  • GAP: provide Device ID from EIR in GAP_EVENT_INQUIRY_RESULT
  • GAP: only store link key if it allows requested security level
  • GAP: abort SSP pairing if MITM protection required but not possible
  • SM: start pairing as Central for already encrypted connection on Slave Security Request
  • GATT Client: Use ATT_READ_REQUEST for first blob of Read Long Characteristic and Read Long Characteristic Descriptor
  • GATT Server: Allow ATT Read Callback to return custom ATT Error Code
  • Nordic SPP Service Server: use GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED and GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED events instead of callback, and RFCOMM_DATA_PACKET for received data
  • u-blox SPP Service Server: use GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED and GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED events instead of callback, and RFCOMM_DATA_PACKET for received data
  • HID: Move src/classic/hid.h into src and prefix with btstack_ to use it with BLE and avoid name clashes
  • HFP: provide acl_handle in events to identify connection
  • HSP AG: emit HSP_SUBEVENT_BUTTON_PRESSED instead of audio connection setup/release
  • Example: use btstack_event.h getters instead of direct array access, use enum to compare status codes

Release v1.3.2

Added

  • GAP: support for Classic Out-of-Band (OOB) pairing via gap_ssp_remote_oob_data with ENABLE_CLASSIC_OOB_PAIRING
  • GAP: read local OOB data on start and on call to gap_ssp_generate_oob_data, provided via GAP_EVENT_LOCAL_OOB_DATA
  • HID Host: add profile, update hid_host_demo.c example

Fixed

  • L2CAP: make handling of HCI disconnect more robust
  • AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect
  • AVRCP: fix issue when Controller and Target send at the same time

Changed

  • A2DP, AVDTP: use a2dp_source_set_config_{TYPE} and avdtp_config{TYPE}_store to avoid large number of parameters

Release v1.3

Added

  • CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz
  • BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz
  • SDP Client RFCOMM: add sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid
  • HFP: ENABLE_HFP_AT_MESSAGES lets HFP emit HFP_SUBEVENT_AT_MESSAGE_SENT and HFP_SUBEVENT_AT_MESSAGE_RECEIVED
  • A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC
  • A2DP + AVDTP Source: allow to send media packet with avdtp_source_stream_send_media_packet and a2dp_source_stream_send_media_packet
  • A2DP + AVDTP Source: add avdtp_source_stream_send_media_payload_rtp and a2dp_source_stream_send_media_payload_rtp
  • A2DP Source: emit A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE
  • A2DP Source: allow to configure endpoints by calling a2dp_source_set_config_{TYPE} during SEP discovery with SBC fallback

Fixed

  • HCI: keep le connecting request on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start()
  • L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1)
  • HFP AG/HSP AG: avoid connecting to remote service with same role
  • A2DP Source: support multiple Stream Endpoints with different Media Codec types
  • A2DP Source: emit codec configure event with reconfigure flag set on reconfigure
  • GATT Compiler: support multiple instances of the same service

Changed

  • GAP: provide Link Type parameter to incoming connection filter for gap_register_classic_connection_filter
  • HFP/GOEP Client/AVDTP/A2DP: return SDP_SERVICE_NOT_FOUND if no suitable SDP record is found
  • AVDTP Source: avdtp_source_stream_send_media_payload includes SBC Header and was deprecated
  • AVDTP/A2DP: use avdtp_channel_mode_t in A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION
  • A2DP: fix events and use a2dp_cid, local_seid, remote_seid field names in A2DP sub-events
  • GATT Client: Skip MTU exchange after MTU exchange on ATT Server
  • Ports: STM32-F103RB Nucleo + CC256x port removed
  • ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos

Release v1.2.1

Fixed

  • L2CAP: use connection handle for channel lookups
  • L2CAP: forward data only in open state

Changed

  • L2CAP: check packet size against local mtu for classic basic channels

Release v1.2

Fixed

  • L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient
  • SM: fix update of sc flag for re-encrypted connection in peripheral role
  • SM: send security request on re-connect if bonded and ENABLE_LE_PROACTIVE_AUTHENTICATION is defined
  • ESP32: fix audio sink driver

Added

  • GAP: gap_delete_bonding removes device from LE Resolving List and from discards LE bonding information
  • GATT Client: delete bonding information if re-encryption fails and ENABLE_LE_PROACTIVE_AUTHENTICATION is not defined
  • GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests
  • SM: emit events for re-encryption started/complete when bonding information is available

Changed

  • AVRCP Controller: allow to send multiple absolute volume commands without waiting for response.
  • GAP: replaced ENABLE_LE_CENTRAL_AUTO_ENCRYPION with ENABLE_LE_PROACTIVE_AUTHENTICATION

Changes October 2020

Fixed

  • AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices
  • AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection
  • SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled
  • SM: set LinkKey flag to request CTKD if enabled
  • SM: store CTKD key with Public Identity Address
  • SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication
  • SM: start SMP Timeout when sending Security Request
  • HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command
  • HCI: fix reject of LE remote connection param request via HCI

Added

  • GAP: add gap_get_link_key_for_bd_addr
  • GAP: add gap_bonded to check if bonding information is available for active connection
  • SM: support h7 for CTKD

Changed

  • SM: Cross-Transport Key Derivation requires ENABLE_CROSS_TRANSPORT_KEY_DERIVATION now
  • SM: block connection if encryption fails for bonded devices as Central
  • SM: support pairing as Central after failed re-encryption

Release v1.1

Fixed

  • AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record

Added

Changed

Changes September 2020

Fixed

  • HFP: fix parsing of ranges e.g. in +CIND responses
  • AVDTP, AVRCP: fix bugs due to transaction id overrun
  • A2DP Source: fix issues with stream configuration by sink
  • hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output

Added

  • btstack_ring_buffer: add btstack_ring_buffer_reset to reset it to initial state/empty
  • GAP: Support for address resolution of resolvable private addresses by Controller with ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION

Changed

  • AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy
  • HSP, HFP: allow to configure usable SCO packet types
  • cc256x: update CC256xC init script to v1.4
  • A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability

Changes August 2020

Fixed

  • ESP32: fix authentication for incoming Secure Connections
  • AVDTP: Fix forwarding of Delay reports
  • STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE
  • tool/create_packet_log: basic support for 16-bit Unicode log files from Windows

Added

  • btstack_run_loop_base: added btstack_run_loop_base_dump_timer
  • GAP: request role change for classic connection via gap_request_role
  • GAP: LE Whitelist API with gap_le_whitelist_x with x = add, remove, clear and new gap_connect_with_whitelist
  • SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready()
  • BNEP lwIP: add bnep_lwip_connect to establish BNEP connection and manage lwIP network interface
  • New btstack_linked_queue utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations
  • btstack_tlv_posix: add btstack_tlv_posix_deinit
  • New btpclient for use with auto-pts project

Changed

  • GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS)
  • GAP: 'gap_auto_connect_x' API deprecated. Please directly manage LE Whitelist with gap_le_whitelist_* functions and call gap_connect_with_whitelist instead
  • example/hid_host_demo: try to become master for incoming connections
  • btstack_run_loop: use btstack_assert instead of local while(true)
  • att_db_util: allow to reset att_db via att_db_util_init

Changes July 2020

Fixed

  • AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported
  • AVDTP: handle concurrent signaling establishment with reject and retry

Added

  • example/hid_host_demo: support reconnect from HID device
  • Crypto: support software AES128 for AES-CCM operations
  • AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums
  • btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback
  • AVDTP: renamed definition of supported features from AVDTP_SOURCE_SF_ and AVDTP_SINK_SF_ to AVDTP_SOURCE_FEATURE_MASK_ and AVDTP_SINK_FEATURE_MASK_ respectively
  • GAP: Provide gap_get_role to query master/slave role for HCI connection handle
  • GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote

Changed

  • GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec

Changes June 2020

Fixed

  • HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands
  • SM: Fix validation of confirm value for secure connection Passkey entry
  • AVRCP: handle concurrent signaling establishment with reject and retry

Added

  • GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS)
  • GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS)
  • Windows port for Dialog DA14585 connected via serial port

Changes

  • CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous

Changes May 2020

Fixed

  • hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections
  • pbap_client: fix PBAP UUID len on connect message
  • SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one
  • A2DP Source: only connect to remote sink stream endpoints
  • btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash
  • hsp_hs: fix disconnect if audio not connected
  • hsp_ag: fix accept incoming connection

Added

  • example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing
  • GAP: gap_set_security_level sets required security level for incoming and outgoing connections
  • cc256x: allow to specify power vector for each modulation type
  • FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit
  • SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode
  • GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable

Changed

  • L2CAP ERTM: send extended features request only once per HCI connection

Changes April 2020

Fixed

  • hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode
  • HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes

Added

  • GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections
  • example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse
  • HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet

Changed

  • Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready
  • esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c
  • att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len

Changes March 2020

Fixed

  • GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan()
  • HCI: only send HCI Read Local Encryption Key Size if supported by Controller

Added

  • GATT Client: allow to register for any notification/indication and/or any connection
  • HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands
  • chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel)
  • btstack_util: added btstack_replace_bd_addr_placeholder

Changed

  • AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications
  • SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations

Changes Februar 2020

Fixed

  • AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED
  • HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event

Changed

  • hid_host_mode: allow sniff mode

Added

  • port/qt-usb and port/qt-h4: integrate BTstack Qt run loop for Unix- and Win32-based Qt application connected to Bluetooth module via H4 over serial port or USB

Changes January 2020

Fixed

  • L2CAP ERTM: avoid read-after-free on decline of incoming connection
  • GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors
  • att_db_util: fix realloc of att db buffer for large attributes
  • btstack_tlv_posix: only keep last value in memory, fix delete operation
  • l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported())

Added

  • att_db_util: provide GATT Database Hash via att_db_util_hash_calc
  • GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic
  • ATT Server: validate request pdu length

Changed

  • Crypto: update AES-CMAC implementation to access all message bytes sequentially

Changes December 2019

Fixed

  • example/pan_lwip_http_server: use Network Access Point, CoD
  • sm: emit pairing complete in master role when no keys are distributed / bonding disabled

Added

Changed

  • Updated CC256x initscript: CC256xC v1.3
  • ESP32: add CMake project files

Changes November 2019

Fixed

  • AVDTP Source: return correct avdtp_cid and local_seid in AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW
  • L2CAP: send LE Data Channel SDUs round robin with other data
  • L2CAP ERTM: send ERTM I-frames round robin with other data

Added

  • ATT Server: return error if request to send now for Notification or Indication already registered
  • Linked List: return if item was added for btstack_linked_list_add[_tail]
  • btstack_run_loop_remove: return bool true if timer/data source was removed
  • segger-rtt: allow to configure with SEGGER_RTT_PACKETLOG_* directives, update to v6.54
  • GAP: support setting Link Supervision Timetout for outgoing Classic connections using gap_set_link_supervision_timeout
  • lwip: add download test files to http server demo

Changed

  • Linked List: return bool true if item was removed

Changes October 2019

Fixed

Added

  • btstack_bool.h: provide boolean type 'bool' via <stdbool.h> or as backport
  • provide btstack_assert(condition)
  • H4 Transport: avoid calling hci_transport_h4_trigger_next_read when transport is closed

Changed

  • libusb and posix ports: store bonding information in TLV

Changes September 2019

Fixed

  • L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm
  • L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote
  • GATT Client: allow Write Without Response independent of other requests

Added

  • GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter
  • GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits GAP_EVENT_RSSI_MEASUREMENT

Changed

  • Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h
  • bluetooth.h: extract internal defintitions to respective protocol layers
  • Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2)

Changes August 2019

Fixed

  • POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days
  • RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection
  • RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM)
  • L2CAP ERTM: stop timers on disconnect
  • L2CAP ERTM: fix sending of segmented SDUs
  • L2CAP ERTM: handle unsupported Information Response
  • SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role

Added

  • btstack_run_loop_base: portable implementation of timer and data source management as base for platform specific implementations

Changed

  • FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups
  • L2CAP ERTM: handle invalid Information Response (assume no extended features supported)
  • POSIX: use monotonic clock as timebase if available
  • HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed
  • HCI: Read Encryption Key Size after encryption was enabled
  • Errata 11838:
    • GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max)
    • GAP: validate encryption key size to emit GAP Security Levels

Changes July 2019

Fixed

  • SM: Fixed regression introduced in f3582630
  • L2CAP: avoid reading l2cap signaling command len out of bounds
  • HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms)

Changed

  • SM: Start encryption upon receiving slave securiy request if bonded
  • hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client

Changes June 2019

Changed

  • FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined
  • BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED
  • Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR

Fixed

  • BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_*
  • libusb: avoid use-after-free for SCO packets on disconnect

Added

  • example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service
  • platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP
  • ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server

Changes May 2019

Changed

  • ESP32: Configure SCO over HCI after power up
  • btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD is defined, an explicit delete field is used to indicate an invalid entry.

Fixed

  • SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer)

Added

  • gatt_client: emit query complete event for signed write operation
  • hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND

Changes April 2019

Changed

  • ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release

Fixed

  • hci: pad LE Scan response with zeroes
  • SM: store local CSRK
  • ATT DB: call write callback for validated signed writes
  • ATT Server: abort signed write validation on incoming new request
  • Bluetooth SIG web scraping tools updated
  • libusb: compiles for FreeBSD

Added

Changes March 2019

Changed

  • use Makefile for stm32-f4discovery-cc256x port
  • le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get

Fixed

  • SM: Use provided authentication requirements in slave security request

Added

  • port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone
  • SM: Track if connection encryption is based on LE Secure Connection pairing
  • ATT DB: Validate if connection encrypted is based on SC if requested
  • att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag
  • GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags
  • ESP32: erase nvs flash is newer nvs version found
  • libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example
  • port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304

Changes February 2019

Changed

  • example/a2dp_sink_demo: use linear resampling to fix sample rate drift
  • btstack_audio: split interface into sink and source

Fixed

  • Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key
  • SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role

Added

  • example/a2dp_sink_demo: add target role, support volume control on both devices
  • example/audio_duplex: playback audio audio source on audio sink (test audio path)
  • btstack_audio_embedded: implement audio source path

Changes January 2019

Changed

  • L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED
  • RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers

Added

  • L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore
  • L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t
  • HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT
  • ad_parser: validate data element length fields in ad_iterator_has_more
  • Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle

Fixed

  • HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment
  • POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux)
  • Crypto: directly process queued crypto operation on HCI result

Changes December 2018

Added

  • SM: generate and store ER / IR keys in TLV, unless manually set by application
  • hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up

Fixed

  • SM: fix internal buffer overrun during random address generation

Changes November 2018

Added

  • GAP: gap_le_connection_interval provides connection interval for conn handle
  • Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation.
  • uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation.
  • SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices
  • SM: generate and store ER / IR keys in TLV, unless manually set by application

Fixed

  • SM: prevent random address updates if gap_random_address_set was used
  • SM: fix internal buffer overrun that can cause storing of bonding information to fail
  • SM: ignore Slave Security Request after sending own Pairing Request
  • L2CAP: fix use after free on disconnect if ERTM is enabled
  • HFP: Handle multiple commands/responses in single RFCOMM packet
  • Memory Pools: clear all buffers before use

Changes October 2018

Added

  • SDP Server: queue incoming connections when already connected instead of rejecting them
  • GAP: Support enter/exit sniff mode via gap_sniff_mode_enter/exit. gap_set_default_link_policy_settings is needed to enable sniff mode in general.
  • HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse.

Fixed

  • HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry
  • L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist
  • L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length
  • L2CAP ERTM: fix memory corruption triggered if local_mtu > mps
  • L2CAP ERTM: fix outgoing fragment management
  • HFP: decline incoming RFCOMM connection after outgoing connection was started
  • AVRCP: fix crash on disconnect of connection established by remote

Changes September 2018

Fixed

  • HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled
  • L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled
  • L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly
  • L2CAP: Check can send now before sending extended information requeste needed for ERTM mode
  • L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request
  • RFCOMM: Trigger l2cap request to send on rfcomm credits when client is waiting to sendtrigger l2cap request to send on rfcomm credits when client is waiting to send
  • RFCOMM: Avoid use-after-free on channel finalize
  • GATT Client: stop timer on disconnect - fixes use after free / crash

Added

  • A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency)
  • 3rd-party: yxml is used for PBAP vCard list parsing
  • cc256xC: new v1.1 init scripts

Changes August 2018

Added

  • PBAP: added pbap_get_phonebook_size() to get phonebook entry count

Fixed

  • GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices.
  • SM: fix pairing for Secure Connections with Bonding if remote sends additional keys
  • SM: drop LTK flag from Pairing Response for Secure Connections
  • L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST

Changes June 2018

Added

  • btstack_audio.h: application level API for audio playback and recording
  • embedded/hal_audio.h: low-level API for audio playback and recording
  • HID Device: hid_device_connect(..) function
  • ESP32: implement hal_audio
  • DA14585: support for Dialog Semiconductor DA14585 LE-only controller
  • Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi

Changed

  • Errata 10734:
    • SM: Generate new EC Public Keypair after each pairing
    • SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error)
  • btstack.h: only include classic headers if ENABLE_CLASSIC is defined
  • windows: ignore virtual Bluetooth adapter provided by VMware
  • Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE

Changes June 2018

Fixed

  • HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC
  • ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect
  • AVRCP Controller: fix parsing of now playing info

Changed

  • ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered

Added

  • ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete

Changes May 2018

Added

  • GAP: re-encrypt outgoing connection if bonded
  • ATT Server: wait until re-encryption is complete
  • GATT Client: wait until re-encryption is complete
  • ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication
  • GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error

Changed

  • ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead

Fixed

  • SM: Fix LE Secure Connection pairing in Central role
  • le_device_db_tlv: fix seq nr management
  • SM: improve le_device_db lookup and storing of IRK
  • GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics
  • RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA

Changes April 2018

Added

  • Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh)
  • SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections
  • Embedded: support btstack_stdin via SEGGER RTT

Changed

  • att_db_util: added security requirement arguments to characteristic creators
  • SM: use btstack_crypto for cryptographpic functions
  • GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption)

Fixed

  • HFP: fix answer call command
  • HCI: fix buffer overrun in gap_inquiry_explode
  • SDP: free service record item on sdp_unregister_service

Changes March 2018

Added

  • GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections
  • ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c
  • ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated

Fixed

  • RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1)
  • HSP HS: accept incomming SCO connection
  • SM: fix iteration over LE Device DB entries for bonding and address resolving
  • SM: store pairing information only if both devices have requested bonding

Changes February 2018

Added

  • GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE
  • SM: new event SM_EVENT_PAIRING_COMPLETE
  • GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done
  • GAP: add gap_delete_all_link_keys

Changed

  • GATT Client: round robin for multiple connections
  • ATT Dispatch: round robin for ATT Server & GATT Client
  • L2CAP: round robin for all L2CAP channels (fixed and dynamic)
  • btstack_link_key_db: addition functions for link key iteration
  • GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up
  • CSR: set all keys in psram instead of default

Fixed

  • tc3556x: fix startup after baud rate change

Changes January 2018

Added

  • Port for Windows with Zephyr HCI Firmware connected via serial port
  • em9304: upload patch containers during HCI bootup
  • Makefile for STM32-F4Discovery port
  • support for console out via SEGGER RTT
  • LE Data Channels example in BTstack and iOS example on GitHub
  • LE Streamer Client can send as fast as possbile as well
  • L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu

Changed

  • HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave)
  • GAP: gap_set_connection_parameters includes scan interval and window params
  • GATT Client: GATT_EVENT_MTU indicates max MTU
  • ATT DB Util: attribute handle is returned for new Services and Characteristics

Fixed

  • Windows: retry serial port operations if not all bytes have been read/written
  • HFP: avoid buffer overflows setting up messages
  • SBC Decoder: improved error handling for invalid SBC audio data
  • GAP: fix Connection Parameter Response in Central role
  • ATT DB Util: update pointer to database in case of realloc
  • GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128
  • GAP: release HCI Connnection after gap_le_conne
  • ATT: Exchanged MTU is propagate to ATT Server and GATT Client

Changes December 2017

Added

  • Introduced btstack_network.h network interface abstraction
  • btstack_network_posix implementation using Linux tun/tap interface
  • WICED: support for btstack_stdin (HAVE_STDIN)
  • GATT Server: Writes to GATT Client Characteristic Configuration are stored in TLV and restored on reconnect. The db.h file generated from db.gatt needs to be re-created.
  • TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h)
  • TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c
  • LE Device DB TLV: overwrite oldest entry if no free entries available
  • SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role
  • Example/hid_host_demo with HID parser and support for basic US keyboard layout
  • EM9304: custom HCI Transport implementation for EM9304 on top of btstack_em9304_spi.h platform abstraction only requires hal_em9304_spi.h to be implemented for new ports
  • Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304)

Changed

  • panu_demo: uses btstack_network.h now
  • WICED: configure printf to replace Linefeed with CRLF
  • SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations

Fixed

  • RFCOMM: support connection requests during connection failure
  • L2CAP: support connection requests during connection failure
  • L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU)
  • HCI: avoid double free during halting
  • SM: fixed reconnect using legacy pairing in slave role