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