1# Change Log 2All notable changes to this project will be documented in this file. 3 4The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) 5and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html). 6 7--- 8 9## Unreleased 10 11### Added 12- L2CAP: additional authorization_required param in l2cap_ecbm_register_service 13- GATT Client: support GATT over Enhanced LE Bearer 14- GATT Server: support GATT over Enhanced LE Bearer 15- LE Device DB: le_device_db_dump dumps LTK 16- Port for Zephyr 3.x 17 18### Fixed 19- HCI: fix remove le device from whitelist 20- HFP: use 'don't care' to accept SCO connections, fixes issue on ESP32 21- HFP: fix LC3-WB init 22- HFP AG: fix setup of audio connection in service level established event 23- HFP AG: fix BCM WBS setup 24- HID Device: set Report Mode as default 25- AVRCP: reject incoming second l2cap connection 26- GATT Client: ignore notifications/indications until re-encrypted for bonded device without ENABLE_LE_PROACTIVE_AUTHENTICATION 27- btstack_flash_bank: support alignment larger than 4 28- windows: fix timestamps in packet logs 29- 30### Changed 31- btstack_crypto: allow MBEDTLS config via MBEDTLS_CONFIG_FILE 32- remove old Zephyr 1.9 port 33 34## Release v1.5.6 35 36### Added 37- HCI: HCI_ACL_CHUNK_SIZE_ALIGNMENT allows to keep HCI transport writes aligned 38- GAP: support additional LE PHYs for scanning and outgoing connections 39- GATT Client: allow to queue requests with gatt_client_request_to_send_gatt_query and gatt_client_request_to_write_without_response 40- GATT Client: support GATT over BR/EDR transport via gatt_client_classic_connect 41- HFP: provide SCO packet types and rx/tx packet lengths in HFP_SUBEVENT_AUDIO_CONNECTION_ESTABLISHED 42- HFP: allow to register custom at commands with hfp_hf_register_custom_at_command 43- HFP: experimental support for LC3-SWB from HFP SWB draft with ENABLE_HFP_SUPER_WIDE_BAND_SPEECH 44- AVRCP: support Cover Art via avrcp_cover_art_client 45- example: gatt_streamer_server and le_streamer_client report DLE and PHY changes 46- NXP: support for NXP Controller with bootloader versions v1, e.g. NXP 88W8997, and v3, e.g. NXP IW416 or IW61x 47- esp32: support esp-idf v5.x audio driver 48- esp32: warn about sdkconfig issues 49- esp32: add BTstack component config options via menuconfig 50- esp32: allow to disable default audio i2s driver via component config 51- esp32: btstack_stdio_init configures buffered output, required for stdin support 52- Port for Renesas RA6M4 with DA14531 53- Port for NXP Controller on POSIX (posix-h4-nxp) 54- Port for newer Infineon Controller on POSIX (posix-h4-bcm) that requires autobaud-mode 55 56### Fixed 57- HCI: fix set extended scan response 58- HCI: fix report of extended advertisements with data len > 31 59- HCI: fix CTKD in Initiator role over BR/EDR SC when using dedicated bonding 60- SM: fix value in SM_EVENT_NUMERIC_COMPARISON_REQUEST 61- SM: ignore Security Request during re-encryption 62- GATT Client: return ERROR_CODE_UNKNOWN_CONNECTION_IDENTIFIER for invalid connection handle 63- A2DP: emit A2DP_SUBEVENT_STREAM_ESTABLISHED with if connection fails, e.g. because of Page Timeout 64- A2DP Source: a2dp_source_stream_send_media_payload was removed, use a2dp_source_stream_send_media_payload_rtp instead 65- A2DP: use samples as timestamp, fixes issue with Apple Airpods Pro 2nd Gen 66- AVDTP Source: avdtp_source_stream_send_media_payload was removed, use avdtp_source_stream_send_media_payload_rtp instead 67- AVRCP: re-register for notification 68- HFP: fix setup/accept of synchronous connection 69- HFP: use mandatory safe settings considering BR/EDR Secure Connections to accept synchronous connections 70- HFP: avoid SCO packet types not supported either locally or remotely 71- HFP: remove trailing newline/carriage return in custom command event 72- PBAP Client: make pbap_set_property_selector work for Pull Phonebook 73- btstack_stdin_embedded: use timer to poll RTT input, fix for tickless RTOS 74- esp32: fix audio power amplifier control on Lyra T v4.3 board 75- tool/convert_gatt_service: removed as GATT Service descriptions not available on Bluetooth SIG web site 76 77### Changed 78- GAP: add gap_set_peer_privacy_mode with default LE_PRIVACY_MODE_DEVICE 79- GAP: use stack defaults for LE Connection Parameter Updates 80- GAP: set minimum and maximum CE length to 0 81- GAP: ENABLE_EXPLICIT_DEDICATED_BONDING_DISCONNECT disables disconnect after dedicated bonding 82- GOEP Client: support multiple instances 83- A2DP Sink: drop unused local seid argument in a2dp_sink_establish_stream 84- HFP: emit HFP_SUBEVENT_CUSTOM_AT_MESSAGE_SENT after sending custom command / unsolicited response code 85- sco_demo_util: replace hfp_msbc by hfp_codec 86- BCM: look for PatchRAM file with prefix DEVICE_NAME and extension '.hcd' 87- bluetooth: indicated identity address in resolved address type enums name 88- btstack_audio: added get_samplerate function to help with audio sample rate synchronization 89- btstack_flash_bank: write empty tag instead of overwriting existing tag with ENABLE_TLV_FLASH_WRITE_ONCE 90- esp32: drop support for Makefile projects from esp-idf 3.x 91- esp32: avoid deprecated btstack_run_loop_freertos API calls 92- esp32: use sample rate compensation in a2dp_sink_demo 93- stm32-f4discovery-cc256x: use external oscillator for better I2S clock 94- stm32-f4discovery: use sample rate compensation in a2dp_sink_demo 95 96 97## Release v1.5.5 98 99### Added 100- hci_dump_stdout: allow to truncate ACL, SCO and ISO packets with HCI_DUMP_STDOUT_MAX_SIZE_* 101- GATT Service: Broadcast Audio Scan Service Server and Client (BASS 1.0) 102- example/a2dp_source_demo: add command to scan and connect to Bluetooth speaker by class of device 103 104### Fixed 105- GAP: reload LE Resolving List after power-cycle 106- GAP: fix setting of LE Scan Response for data that needs to be fragmented 107- SM: fix pairing process with active ATT communication 108- ESP32: fix init for BR/EDR Only mode 109- ESP32: fix audio driver for sink + source mode 110- ESP32: fixes for ESP-IDF v5.x 111- ESP32: fix compile of non-BTstack examples after adding components/btstack 112 113### Changed 114- GAP: reload LE Filterlist and Periodic Advertiser List after power-cycle 115- SM: delete bonding information for existing device with BD_ADDR on new pairing with different IRK 116- Mesh: move GATT Services into src/mesh/gatt-service 117- LE Audio: move GATT Services into src/le-audio/gatt-service 118- libusb: improve implementation 119 120## Known Issues 121- ESP32: audio driver for ES8388/LyraT v4.3 not updated for esp-idf 5.x 122 123 124## Release v1.5.4 125 126### Added 127- HFP HF: send custom AT command with hfp_hf_send_at_command 128- HFP HF: terminate held calls with hfp_hf_terminate_held_calls 129- HFP HF: provide Call Waiting information alpha field 130- HFP HF: add hfp_hf_set_default_microphone_gain and hfp_hf_set_set_default_speaker_gain for SLC 131- HFP AG: support handling of custom AT commands with hfp_ag_register_custom_at_command 132- HFP AG: send custom unsolicited result code with hfp_ag_send_unsolicited_result_code 133- GAP: allow to enable duplicate filter for LE scanning with gap_set_scan_duplicate_filter 134- GAP: support BIG with gap_big_create and gap_big_terminate 135- GAP: support BIG Sync gap_big_sync_create and gap_big_sync_terminate 136- GAP: support Periodic Advertisement Sync Transfer 137- port: CMake build files in all windows-* ports allow to use Visual Studio 2022 138- embedded audio: mono audio is played on both channels if HAVE_HAL_AUDIO_SINK_STEREO_ONLY is defined 139- Support for ESP32-C3 and ESP32-S3 140 141### Fixed 142- HCI: only add paired LE devices with IRK to resolving list 143- HCI: send HCI LE Create Connection Cancel only once for outgoing LE connections without whitelist 144- GAP: use static random address after power up 145- L2CAP: fix L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 146- SM: avoid potential loop during CTKD 147 148### Changed 149- HCI Dump: provide log level to log_message implementation 150- GAP: replace BTSTACK_EVENT_DISCOVERABLE_ENABLED with BTSTACK_EVENT_SCAN_MODE_CHANGED 151 152 153## Release v1.5.3 154 155### Added 156- GAP: support periodic advertising with ENABLE_LE_PERIODIC_ADVERTISING 157- GAP: support periodic inquiry mode with gap_inquiry_periodic_start 158- HFP HF: provide Calling Line Identification alpha field 159- HFP HF: emit HFP_SUBEVENT_TRANSMIT_DTMF_CODES after sending DTMF command 160- GOEP Server 161- Chipset: support for firmware download and configuration of Realtek Controllers 162 163### Fixed 164- GAP: fix gap_connect_cancel for gap_connect_with_whitelist 165- GAP: fix race condition that causes duplicate authenticate request 166- SM: address update for non-resolvable private addresses 167- SM: reset state on power off transition 168- L2CAP: Fix accept incoming ERTM connection when Information Request already complete 169- A2DP Sink: fix config API for AAC, ATRAC, and other codecs 170- HFP: try next link setting for SCO connection failure after SCO reject errors 171- HFP AG: activate all AG indicators upon service level connection establishment 172- HFP AG: handle call termination in alerting call state 173- HFP HF: fix parsing of phone number for voice tag 174- HFP HF: report HFP_SUBEVENT_NETWORK_OPERATOR_CHANGED event 175 176### Changed 177- HCI: use ERROR_CODE_CONNECTION_REJECTED_DUE_TO_SECURITY_REASONS to rejected classic connections 178- SM: pairing events indicate if LE Secure Connection will be used 179- A2DP: new a2dp.c contains shared code of Sink and Source roles 180- A2DP Sink: automatically configure stream endpoint for outgoing connections 181- HFP AG: drop unused number parameter from hfp_ag_outgoing_call_initiated 182- libusb: command line options to delete TLV and specify log file path 183- Windows: native implementations of btstack_tlv_window, hci_dump_windows_fs, hci_dump_window_stdout 184 185## Release v1.5.2 186 187### Added 188- GAP: ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS serializes Inquiry, Remote Name Request and Create Connection operations 189- GAP: support extended advertising with ENABLE_LE_EXTENDED_ADVERTISING 190- GAP: gap_enable_link_watchdog() uses automatic flush timeout to disconnect if data cannot be sent 191- GAP: gap_secure_connections_active() to query if BR/EDR Secure Connecions are possible 192- ATT DB: provide gatt_server_get_handle_range_for_service_with_uuid16 to find included service within handle range 193- GATT Service: Audio Input Control Service Server (AICS 1.0) 194- GATT Service: Microphone Control Service Server (MCS 1.0) 195- GATT Service: Volume Control Service Server (VCS 1.0) 196- GATT Service: Volume Offset Control Service Server (VOCS 1.0) 197 198### Fixed 199- POSIX: fix RTS/CTS configuration by keeping local termios copy in btstack_uart_posix 200- HCI: fix handling of HCI Connection Complete with error (regression introduced in v1.5.1) 201- GAP: disable scanning, advertising, connection before updating random address 202- GAP: fix LE Scan with whitelist 203- HFP_AG: fix tracking for call dropped during outgoing ringing 204- HFP: Free HFP Connection object on SDP error / Service not found 205- PBAP Client: emit operation complete with status OBEX_ABORTED 206 207### Changed 208- Chipset: use da145xx in folder/file/function names for Dialog Semiconductor SoCs 209- GAP: set min encryption key size during init, if supported 210- AVDTP: use BLUETOOTH_SERVICE_CLASS_AUDIO_SINK / SOURCE instead of BLUETOOTH_PROTOCOL_AVDTP in SDP queries 211- ATT Server: use uint8_t for status returns 212- libusb, POSIX and Windows ports: use '-' instead of ':' in btstack_BD_ADDR.tlv filename 213 214 215## Release v1.5.1 216 217### Added 218- GOEP Client: add goep_client_version_20_or_higher 219- ESP32: implement audio source 220 221### Fixed 222- PBAP Client: support disconnect while operation is ongoing 223- PBAP Client: use SRM only if GOEP v2.0 or higher connection 224- PBAP Client: emit vCard entry data as PBAP_DATA_PACKET 225- L2CAP: limit remote MTU by local tx configuration in ERTM 226 227### Changed 228- Example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation 229- ESP32: update sdkconfig for esp-idf v4.3, disable Bluedroid host stack 230- ESP32: use I2S configuration from ESP32 LyraT V4.3 231 232 233## Release v1.5.0 234 235### Added 236- HCI Dump: Support BTSnoop format in hci_dump_posix_fs.c for format = HCI_DUMP_BTSNOOP 237- HCI Dump RTT STDOUT: drop messages if RTT buffer is full and RTT is configured for non-blocking 238- HCI: hci_remove_event_handler to remove packet handler 239- hci_cmd: support variable length fields and arrayed parameters 240- GAP: ENABLE_EXPLICIT_LINK_KEY_REPLY allows for asynchronous link key lookup by application 241- GAP: gap_set_page_timeout to set Page Timeout 242- GAP: gap_inquiry_set_scan_activity to set Inquiry Scan Activity 243- L2CAP: emit L2CAP_EVENT_INFORMATION_RESPONSE event with extended features and fixed channels supported 244- L2CAP: support Enhanced Credit-based Flow-Control Mode for connection-oriented channels over BR/EDR/LE 245- A2DP: allow to register media codec validator for sink and source with: 246 - `a2dp_sink_register_media_config_validator` 247 - `a2dp_source_register_media_config_validator` 248- 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 249- OBEX: new obex_parser for chunked OBEX data 250- SM: Support Cross-Transport Key-Derivation (CTKD) of LE LTK from BR/EDR SC Link Key in Responder role 251- SM: sm_remove_event_handler to remove packet handler 252- GATT Service: Bond Management Service (BMS 1.0) Server 253- GATT Service: Microphone Control Service (MICS 1.0) Server 254- GATT Service: TX Power Service (TPS 1.0) Server 255- POSIX: btstack_signal allows to register for callback on signal, e.g. ctrl-c 256- Windows: btstack_stdin_window_register_ctrl_c_callback allows to register for ctrl-c 257 258### Fixed 259- A2DP Source: fix reconfigure 260- AVRCP Controller: prevent registering of notifications for unsupported events 261- RFCOMM: fixed handling of remote port configuration command 262- HFP AG: fix accept incoming connection while audio connection is established 263- PBAP Client: handle chunked vCard Listing 264- PBAP Client: use new streaming obex_parser to handle chunked OBEX data 265- SM: Work around for unexpected Windows 10 disconnect for BR Secure Connections (SMP over BR timeout) 266- SM: support storing bonding information for devices with identical IRK but different public addresses 267- GAP: restart advertising when private address changes 268- le_device_db_tlv: keep number of devices reported by le_device_db_count if old entry is replaced 269 270### Changed 271- Drop iOS support 272- HCI: provide status instead of undocumented int error code and bool for API functions 273- HCI: use 1000 ms watchdog to force power off for hci_power_control(HCI_POWER_OFF) 274- GAP: local name, EIR data, class of device and default link policy can be updated at any time 275- L2CAP: provide status instead of undocumented int error code and bool for API functions 276- L2CAP: remote features not required for SDP connections 277- L2CAP: replaced l2cap_register_packet_handler with l2cap_add_event_handler to register multiple handlers 278- L2CAP: drop reason parameter in l2cap_disconnect 279- L2CAP: use official terminology for L2CAP channel modes - ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE replaces ENABLE_LE_DATA_CHANNELS 280- L2CAP: unify API for can send now, request to send, and send packet and disconnect channel 281- L2CAP: unify events for can send now, packet sent, channel closed (CbM/ECBM using existing events) 282- RFCOMM: `RFCOMM_EVENT_PORT_CONFIGURATION` contains rfcomm_cid and remote flag, emitted for query config 283- RFCOMM: provide status instead of undocumented int error code and bool for API functions 284- RFCOMM: remote port configuration, line status, and modem status are sent by channel state machine 285- HSP: add ACL Connection to all events and BD ADDR to HSP_SUBEVENT_RFCOMM_CONNECTION_COMPLETE 286- HFP: API functions return status code if appropriate 287- HFP: removed one parameter from hfp_ag/hf_activate_voice_recognition function, introduce hfp_ag/hf_deactivate_voice_recognition instead 288- HFP: merged legacy and enhanced Voice Recognition Activation (VRA) API. If available enhanced mode will be preferred. 289- 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. 290- 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. 291- AVDTP: media config validator is called with preview of media codec configuration event and configured separately for sink/source 292- AVRCP: use PANEL as default unit + subunit info 293- AVRCP Controller: automatically query supported events when registering for notifications 294- AVRCP Target: cache companies and events in library and remove need to answer query in application callback. Use Bluetooth SIG as default company. 295- Run Loop: new functionality for HCI transport drivers and inter-process communication: 296 - *btstack_run_loop_poll_data_sources_from_irq*: used to transfer control from IRQ handler to main thread/run loop 297 - *btstack_run_loop_execute_on_main_thread*: schedule code execution on main thread from other thread 298 - *btstack_run_loop_trigger_exit*: trigger run loop exit 299- POSIX / Windows / Raspi / Qt: use updated ctrl-c handling 300- POSIX TLV: use max value size of 2048, assert in store function if value size is larger 301 302 303## Release v1.4.1 304 305### Added 306- GAP: emit GAP_EVENT_PAIRING_STARTED and GAP_EVENT_PAIRING_COMPLETE 307 308### Fixed 309- GAP: store link key in hci connection struct to allow authenticate after pairing without bonding 310- GAP: avoid requesting authentication twice 311- GAP: cache own address on start advertising and connecting, provide getters 312- GAP: stop LE connecting if create connection fails (e.g. connectable adv active and multiple roles not supported) 313- SM: fix race condition between local address changes and pairing procedure 314- ATT DB: fix spelling `gatt_server_get_handle_range_for_service_with_uuid128`, `gatt_server_get_handle_range_for_service_with_uuid16` 315 316### Changed 317- HCI: update advertising data without stopping advertising first 318- GAP: Drop local bonding flag in IO Capability Reply if remote does not indicate bonding 319- GAP: return status for `gap_set_security_mode` 320- GAP: abort legacy pairing if Level 4 is required 321- GAP: abort SSP on IO Capabilities Request event if Level 4 is required but SC not supported by remote 322- GAP: abort SSP on User Confirmation Request event if Level 3 is required but MITM protection not possible 323- GAP: validate minimal service security level can be reached during pairing in responder role 324- L2CAP: don't trigger hci disconnect if l2cap security requirements are insufficient 325- CVE-2020-26555: reject connections to and from devices with same BD ADDR 326- CVE-2020-26555: ignore NULL link key 327- CVE-2020-26558: abort LE Secure Connection pairing if remote uses the same public key 328 329## Release v1.4 330 331### Added 332- HCI: `btstack_transport_sco.h` supports SCO over physical PCM/I2S interface (`HAVE_SCO_TRANSPORT`) 333- POSIX: `btstack_transport_sco_i2s_test_bridge.c` implements SCO transport interface for UART-to-I2S test bridge 334- btstack_uart: `btstack_uart_t` interface extends `btstack_uart_block_t`: 335 - support sending and receiving SLIP frames for HCI H5 336 - support odd parity 337 - `hci_transport_h4` and chipset drivers have new functions to provide `btstack_uart_t` 338- btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing `btstack_uart_block` drivers. 339- hci_transport: add parity field and pass on to `btstack_uart_t` in h4 and h5 340- GATT Client: Battery Service Client 341- GATT Client: Device Information Service Client 342- GATT Client: HID-over-GATT (HOG) Client, Report and Boot Host 343- GATT Client: Scan Parameters Service Client 344- GATT Server: Scan Parameters Service Server 345- GAP: support scan page configuration with `gap_set_page_scan_activity` and `gap_set_page_scan_type` 346- GAP: support sniff subrating with `gap_sniff_subrating_configure` 347- GAP: support QoS setup with `gap_qos_set` 348- AVRCP: new field `button_pressed` in `AVRCP_SUBEVENT_OPERATION` 349- AVRCP: `AVRCP_SUBEVENT_OPERATION` emitted for button release 350- AVRCP Controller: `avrcp_controller_start_press_and_hold_cmd` supports arbitrary device buttons 351- AVRCP Controller: reassemble fragmented AVCTP packets 352- AVDTP: `avdtp_register_media_config_validator` allows to validate media codec configuration 353- A2DP Source: `ENABLE_A2DP_SOURCE_EXPLICIT_CONFIG` disables auto config. requires call to `a2dp_source_set_config_{CODEC}` 354 355### Fixed 356- GAP: calculate IO Cap AuthReq Bondable Mode based on `gap_ssp_set_authentication_requirement` and `gap_set_bondable_mode` 357- GAP: only store link key for SSP if remote side has set bondable in io cap auth requirements 358- GAP: allow to disable link supervision timeout 359- GAP: fix `gap_connect` after `gap_connect_cancel` 360- GAP: re-configure advertisements after power cycle 361- HCI: handle start inquiry failure 362- L2CAP: fix create outgoing connection triggered from packet handler on hci disconnect event 363- L2CAP: return unknown mandatory option in config response 364- AVDTP: fix spelling `avdtp_set_preferred_sampling_frequency` 365- AVRCP Target: fix notification changed event 366- HFP: Emit audio connection released on SLC Release, e.g. on remote power off 367- HFP HF: fix audio connection setup if codec negotiation is supported 368- HFP HF: only emit single event for RING and AG Status updates 369- HFP AG: fix audio connection setup for in-band ringtone on incoming connection 370 371### Changed 372- Port Archive: moved ports that are not recommended for new designs to port/archive folder: 373 - MSP430: the ports used the older community GCC version without 20-bit support needed for code size > 64kB 374 - Broadcom/Cypress H5: uploading PatchRAM is only possible in H4 mode. It's better to also use H4 in general 375 - PIC32-Harmony: the port used Harmony v1 while Harmony v3 has been out since a while 376 - iOS: not supported 377- Run Loop Base: functionality used in most platform run loop implementations 378 - code from `btstack_run_loop_base.c` moved into `btstack_run_loop.c` to minimize changes to build systems 379 - `btstack_run_loop_base.c` is a placeholder and can be removed from build 380- HCI Dump: replace monolithic `hci_dump.c` (with many #ifdefs) into dispatcher with platform-specific implementations: 381 - `posix/hci_dump_posix_fs` - writes binary log file 382 - `posix/hci_dump_stdout` - log to console using printf with local system time 383 - `embedded/hci_dump_embedded_stdout` - log to console using printf 384 - `embedded/hci_dump_segger_stdout` - log to RTT console using `SEGGER_printf` 385 - `embedded/hci_dump_segger_binary` - writes binary log over RTT to host 386- HCI: config I2S for BCM Controllers if `ENABLE_SCO_OVER_PCM`, reduce bit clock to 256/512 kHz 387- btstack_uart_posix: supports SLIP frames and replaces `btstack_uart_block_posix` 388- hci_transport_h5: more performant H5 implementation that requires `btstack_uart_t` driver with SLIP support 389- POSIX Ports: use new `btstack_uart_posix` implementation 390- posix-h5/posix-h5-bcm: use even parity for UART 391- HCI Transport: extract convenience function declaration for h4, h5, em9304_spi, and usb into separate hci_transport_{type}.h 392- GAP: provide Device ID from EIR in GAP_EVENT_INQUIRY_RESULT 393- GAP: only store link key if it allows requested security level 394- GAP: abort SSP pairing if MITM protection required but not possible 395- SM: start pairing as Central for already encrypted connection on Slave Security Request 396- GATT Client: Use ATT_READ_REQUEST for first blob of Read Long Characteristic and Read Long Characteristic Descriptor 397- GATT Server: Allow ATT Read Callback to return custom ATT Error Code 398- Nordic SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 399 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 400- u-blox SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 401 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 402- HID: Move `src/classic/hid.h` into `src` and prefix with `btstack_` to use it with BLE and avoid name clashes 403- HFP: provide acl_handle in events to identify connection 404- HSP AG: emit HSP_SUBEVENT_BUTTON_PRESSED instead of audio connection setup/release 405- Example: use `btstack_event.h` getters instead of direct array access, use enum to compare status codes 406 407 408## Release v1.3.2 409 410### Added 411- GAP: support for Classic Out-of-Band (OOB) pairing via `gap_ssp_remote_oob_data` with `ENABLE_CLASSIC_OOB_PAIRING` 412- GAP: read local OOB data on start and on call to `gap_ssp_generate_oob_data`, provided via `GAP_EVENT_LOCAL_OOB_DATA` 413- HID Host: add profile, update `hid_host_demo.c` example 414 415### Fixed 416- L2CAP: make handling of HCI disconnect more robust 417- AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect 418- AVRCP: fix issue when Controller and Target send at the same time 419 420### Changed 421- A2DP, AVDTP: use `a2dp_source_set_config_{TYPE}` and `avdtp_config{TYPE}_store` to avoid large number of parameters 422 423 424## Release v1.3 425 426### Added 427- CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 428- BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 429- SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 430- HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 431- A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 432- A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 433- A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 434- A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 435- A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 436 437### Fixed 438- HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 439- L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 440- HFP AG/HSP AG: avoid connecting to remote service with same role 441- A2DP Source: support multiple Stream Endpoints with different Media Codec types 442- A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 443- GATT Compiler: support multiple instances of the same service 444 445### Changed 446- GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 447- HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 448- AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 449- AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 450- A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 451- GATT Client: Skip MTU exchange after MTU exchange on ATT Server 452- Ports: STM32-F103RB Nucleo + CC256x port removed 453- ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 454 455 456## Release v1.2.1 457 458### Fixed 459- L2CAP: use connection handle for channel lookups 460- L2CAP: forward data only in open state 461 462### Changed 463- L2CAP: check packet size against local mtu for classic basic channels 464 465 466## Release v1.2 467 468### Fixed 469- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 470- SM: fix update of sc flag for re-encrypted connection in peripheral role 471- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 472- ESP32: fix audio sink driver 473 474### Added 475- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 476- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 477- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 478- SM: emit events for re-encryption started/complete when bonding information is available 479 480### Changed 481- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 482- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 483 484 485## Changes October 2020 486 487### Fixed 488- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 489- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 490- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 491- SM: set LinkKey flag to request CTKD if enabled 492- SM: store CTKD key with Public Identity Address 493- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 494- SM: start SMP Timeout when sending Security Request 495- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 496- HCI: fix reject of LE remote connection param request via HCI 497 498### Added 499- GAP: add `gap_get_link_key_for_bd_addr` 500- GAP: add `gap_bonded` to check if bonding information is available for active connection 501- SM: support h7 for CTKD 502 503### Changed 504- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 505- SM: block connection if encryption fails for bonded devices as Central 506- SM: support pairing as Central after failed re-encryption 507 508 509## Release v1.1 510 511### Fixed 512- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 513 514### Added 515 516### Changed 517 518 519## Changes September 2020 520 521### Fixed 522- HFP: fix parsing of ranges e.g. in +CIND responses 523- AVDTP, AVRCP: fix bugs due to transaction id overrun 524- A2DP Source: fix issues with stream configuration by sink 525- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 526 527### Added 528- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 529- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 530 531### Changed 532- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 533- HSP, HFP: allow to configure usable SCO packet types 534- cc256x: update CC256xC init script to v1.4 535- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 536 537## Changes August 2020 538 539### Fixed 540- ESP32: fix authentication for incoming Secure Connections 541- AVDTP: Fix forwarding of Delay reports 542- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 543- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 544 545### Added 546- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 547- GAP: request role change for classic connection via `gap_request_role` 548- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 549- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 550- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 551- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 552- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 553- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 554 555### Changed 556- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 557- GAP: 'gap_auto_connect_x' API deprecated. Please directly manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 558- example/hid_host_demo: try to become master for incoming connections 559- btstack_run_loop: use btstack_assert instead of local while(true) 560- att_db_util: allow to reset att_db via `att_db_util_init` 561 562## Changes July 2020 563 564### Fixed 565- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 566- AVDTP: handle concurrent signaling establishment with reject and retry 567 568### Added 569- example/hid_host_demo: support reconnect from HID device 570- Crypto: support software AES128 for AES-CCM operations 571- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 572- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 573- 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 574- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 575- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 576 577### Changed 578- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 579 580 581## Changes June 2020 582 583### Fixed 584- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 585- SM: Fix validation of confirm value for secure connection Passkey entry 586- AVRCP: handle concurrent signaling establishment with reject and retry 587 588### Added 589- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 590- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 591- Windows port for Dialog DA14585 connected via serial port 592 593## Changes 594- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 595 596## Changes May 2020 597 598### Fixed 599- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 600- pbap_client: fix PBAP UUID len on connect message 601- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 602- A2DP Source: only connect to remote sink stream endpoints 603- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 604- hsp_hs: fix disconnect if audio not connected 605- hsp_ag: fix accept incoming connection 606 607### Added 608- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 609- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 610- cc256x: allow to specify power vector for each modulation type 611- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 612- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 613- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 614 615### Changed 616- L2CAP ERTM: send extended features request only once per HCI connection 617 618 619## Changes April 2020 620 621### Fixed 622- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 623- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 624 625### Added 626- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 627- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 628- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 629 630### Changed 631- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 632- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 633- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 634 635 636## Changes March 2020 637 638### Fixed 639- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 640- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 641 642### Added 643- GATT Client: allow to register for any notification/indication and/or any connection 644- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 645- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 646- btstack_util: added btstack_replace_bd_addr_placeholder 647 648### Changed 649- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 650- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 651 652 653## Changes Februar 2020 654 655### Fixed 656- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 657- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 658 659### Changed 660- hid_host_mode: allow sniff mode 661 662### Added 663- 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 664 665 666## Changes January 2020 667 668### Fixed 669- L2CAP ERTM: avoid read-after-free on decline of incoming connection 670- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 671- att_db_util: fix realloc of att db buffer for large attributes 672- btstack_tlv_posix: only keep last value in memory, fix delete operation 673- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 674 675### Added 676- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 677- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 678- ATT Server: validate request pdu length 679 680### Changed 681- Crypto: update AES-CMAC implementation to access all message bytes sequentially 682 683 684## Changes December 2019 685 686### Fixed 687- example/pan_lwip_http_server: use Network Access Point, CoD 688- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 689 690### Added 691 692### Changed 693- Updated CC256x initscript: CC256xC v1.3 694- ESP32: add CMake project files 695 696 697## Changes November 2019 698 699### Fixed 700- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 701- L2CAP: send LE Data Channel SDUs round robin with other data 702- L2CAP ERTM: send ERTM I-frames round robin with other data 703 704### Added 705- ATT Server: return error if request to send now for Notification or Indication already registered 706- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 707- btstack_run_loop_remove: return bool true if timer/data source was removed 708- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 709- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 710- lwip: add download test files to http server demo 711 712### Changed 713- Linked List: return bool true if item was removed 714 715 716## Changes October 2019 717 718### Fixed 719 720### Added 721- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 722- provide `btstack_assert(condition)` 723- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 724 725### Changed 726- libusb and posix ports: store bonding information in TLV 727 728 729## Changes September 2019 730 731### Fixed 732- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 733- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 734- GATT Client: allow Write Without Response independent of other requests 735 736### Added 737- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 738- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 739 740### Changed 741- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 742- bluetooth.h: extract internal defintitions to respective protocol layers 743- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 744 745 746## Changes August 2019 747 748### Fixed 749- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 750- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 751- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 752- L2CAP ERTM: stop timers on disconnect 753- L2CAP ERTM: fix sending of segmented SDUs 754- L2CAP ERTM: handle unsupported Information Response 755- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 756 757### Added 758- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 759 760## Changed 761- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 762- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 763- POSIX: use monotonic clock as timebase if available 764- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 765- HCI: Read Encryption Key Size after encryption was enabled 766- Errata 11838: 767 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 768 - GAP: validate encryption key size to emit GAP Security Levels 769 770## Changes July 2019 771 772### Fixed 773- SM: Fixed regression introduced in f3582630 774- L2CAP: avoid reading l2cap signaling command len out of bounds 775- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 776 777### Changed 778- SM: Start encryption upon receiving slave securiy request if bonded 779- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 780 781--- 782 783## Changes June 2019 784 785### Changed 786- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 787- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 788- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 789 790### Fixed 791- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 792- libusb: avoid use-after-free for SCO packets on disconnect 793 794### Added 795- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 796- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 797- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 798 799--- 800 801## Changes May 2019 802 803### Changed 804- ESP32: Configure SCO over HCI after power up 805- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 806 is defined, an explicit delete field is used to indicate an invalid entry. 807 808### Fixed 809- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 810 811### Added 812- gatt_client: emit query complete event for signed write operation 813- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 814 815--- 816 817## Changes April 2019 818 819### Changed 820- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 821 822### Fixed 823- hci: pad LE Scan response with zeroes 824- SM: store local CSRK 825- ATT DB: call write callback for validated signed writes 826- ATT Server: abort signed write validation on incoming new request 827- Bluetooth SIG web scraping tools updated 828- libusb: compiles for FreeBSD 829 830### Added 831 832--- 833 834## Changes March 2019 835 836### Changed 837- use Makefile for stm32-f4discovery-cc256x port 838- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 839 840### Fixed 841- SM: Use provided authentication requirements in slave security request 842 843### Added 844- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 845- SM: Track if connection encryption is based on LE Secure Connection pairing 846- ATT DB: Validate if connection encrypted is based on SC if requested 847- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 848- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 849- ESP32: erase nvs flash is newer nvs version found 850- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 851- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 852 853## Changes February 2019 854 855### Changed 856- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 857- btstack_audio: split interface into sink and source 858 859### Fixed 860- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 861- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 862 863### Added 864- example/a2dp_sink_demo: add target role, support volume control on both devices 865- example/audio_duplex: playback audio audio source on audio sink (test audio path) 866- btstack_audio_embedded: implement audio source path 867 868--- 869 870## Changes January 2019 871 872### Changed 873- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 874- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 875 876### Added 877- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 878- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 879- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 880- ad_parser: validate data element length fields in ad_iterator_has_more 881- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 882 883### Fixed 884- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 885- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 886- Crypto: directly process queued crypto operation on HCI result 887 888--- 889 890## Changes December 2018 891 892### Added 893- SM: generate and store ER / IR keys in TLV, unless manually set by application 894- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 895 896### Fixed 897- SM: fix internal buffer overrun during random address generation 898 899## Changes November 2018 900 901### Added 902- GAP: gap_le_connection_interval provides connection interval for conn handle 903- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 904- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 905- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 906- SM: generate and store ER / IR keys in TLV, unless manually set by application 907 908### Fixed 909- SM: prevent random address updates if gap_random_address_set was used 910- SM: fix internal buffer overrun that can cause storing of bonding information to fail 911- SM: ignore Slave Security Request after sending own Pairing Request 912- L2CAP: fix use after free on disconnect if ERTM is enabled 913- HFP: Handle multiple commands/responses in single RFCOMM packet 914- Memory Pools: clear all buffers before use 915 916--- 917 918## Changes October 2018 919 920### Added 921- SDP Server: queue incoming connections when already connected instead of rejecting them 922- 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. 923- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 924 925### Fixed 926- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 927- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 928- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 929- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 930- L2CAP ERTM: fix outgoing fragment management 931- HFP: decline incoming RFCOMM connection after outgoing connection was started 932- AVRCP: fix crash on disconnect of connection established by remote 933 934--- 935 936## Changes September 2018 937 938### Fixed 939- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 940- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 941- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 942- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 943- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 944- 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 945- RFCOMM: Avoid use-after-free on channel finalize 946- GATT Client: stop timer on disconnect - fixes use after free / crash 947 948### Added 949- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 950- 3rd-party: yxml is used for PBAP vCard list parsing 951- cc256xC: new v1.1 init scripts 952 953--- 954 955## Changes August 2018 956 957### Added 958- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 959 960### Fixed 961- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 962- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 963- SM: drop LTK flag from Pairing Response for Secure Connections 964- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 965 966## Changes June 2018 967 968### Added 969- btstack_audio.h: application level API for audio playback and recording 970- embedded/hal_audio.h: low-level API for audio playback and recording 971- HID Device: hid_device_connect(..) function 972- ESP32: implement hal_audio 973- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 974- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 975 976### Changed 977- Errata 10734: 978 - SM: Generate new EC Public Keypair after each pairing 979 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 980- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 981- windows: ignore virtual Bluetooth adapter provided by VMware 982- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 983 984--- 985 986## Changes June 2018 987 988### Fixed 989- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 990- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 991- AVRCP Controller: fix parsing of now playing info 992 993### Changed 994- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 995 996### Added 997- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 998 999--- 1000 1001## Changes May 2018 1002 1003### Added 1004- GAP: re-encrypt outgoing connection if bonded 1005- ATT Server: wait until re-encryption is complete 1006- GATT Client: wait until re-encryption is complete 1007- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 1008- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 1009 1010### Changed 1011- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 1012 1013### Fixed 1014- SM: Fix LE Secure Connection pairing in Central role 1015- le_device_db_tlv: fix seq nr management 1016- SM: improve le_device_db lookup and storing of IRK 1017- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 1018- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 1019 1020--- 1021 1022## Changes April 2018 1023 1024### Added 1025- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 1026- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 1027- Embedded: support btstack_stdin via SEGGER RTT 1028 1029### Changed 1030- att_db_util: added security requirement arguments to characteristic creators 1031- SM: use btstack_crypto for cryptographpic functions 1032- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 1033 1034### Fixed 1035- HFP: fix answer call command 1036- HCI: fix buffer overrun in gap_inquiry_explode 1037- SDP: free service record item on sdp_unregister_service 1038 1039## Changes March 2018 1040 1041### Added 1042- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 1043- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 1044- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 1045 1046### Fixed 1047- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 1048- HSP HS: accept incomming SCO connection 1049- SM: fix iteration over LE Device DB entries for bonding and address resolving 1050- SM: store pairing information only if both devices have requested bonding 1051 1052--- 1053 1054## Changes February 2018 1055 1056### Added 1057- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 1058- SM: new event SM_EVENT_PAIRING_COMPLETE 1059- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 1060- GAP: add gap_delete_all_link_keys 1061 1062### Changed 1063- GATT Client: round robin for multiple connections 1064- ATT Dispatch: round robin for ATT Server & GATT Client 1065- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 1066- btstack_link_key_db: addition functions for link key iteration 1067- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 1068- CSR: set all keys in psram instead of default 1069 1070### Fixed 1071- tc3556x: fix startup after baud rate change 1072 1073--- 1074 1075## Changes January 2018 1076 1077### Added 1078- Port for Windows with Zephyr HCI Firmware connected via serial port 1079- em9304: upload patch containers during HCI bootup 1080- Makefile for STM32-F4Discovery port 1081- support for console out via SEGGER RTT 1082- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 1083- LE Streamer Client can send as fast as possbile as well 1084- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 1085 1086### Changed 1087- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 1088- GAP: gap_set_connection_parameters includes scan interval and window params 1089- GATT Client: GATT_EVENT_MTU indicates max MTU 1090- ATT DB Util: attribute handle is returned for new Services and Characteristics 1091 1092### Fixed 1093- Windows: retry serial port operations if not all bytes have been read/written 1094- HFP: avoid buffer overflows setting up messages 1095- SBC Decoder: improved error handling for invalid SBC audio data 1096- GAP: fix Connection Parameter Response in Central role 1097- ATT DB Util: update pointer to database in case of realloc 1098- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 1099- GAP: release HCI Connnection after gap_le_conne 1100- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 1101 1102--- 1103 1104## Changes December 2017 1105 1106### Added 1107- Introduced btstack_network.h network interface abstraction 1108- btstack_network_posix implementation using Linux tun/tap interface 1109- WICED: support for btstack_stdin (HAVE_STDIN) 1110- 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. 1111- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 1112- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 1113- LE Device DB TLV: overwrite oldest entry if no free entries available 1114- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 1115- Example/hid_host_demo with HID parser and support for basic US keyboard layout 1116- 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 1117- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 1118 1119### Changed 1120- panu_demo: uses btstack_network.h now 1121- WICED: configure printf to replace Linefeed with CRLF 1122- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 1123 1124### Fixed 1125- RFCOMM: support connection requests during connection failure 1126- L2CAP: support connection requests during connection failure 1127- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 1128- HCI: avoid double free during halting 1129- SM: fixed reconnect using legacy pairing in slave role 1130 1131 1132