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