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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

  • SDP Server: queue incoming connections when already connected instead of rejecting them

Fixed

  • 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
  • HFP: decline incoming RFCOMM connection after outgoing connection was started

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
  • Rasperry 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 [https://github.com/bluekitchen/CBL2CAPChannel-Demo](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