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