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