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