btstack/CHANGELOG.md

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
• 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.
• 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.

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
• 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