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 12HCI: `btstack_transport_sco.h` allows to support SCO over physical PCM/I2S interface (`HAVE_SCO_TRANSPORT`) 13POSIX: `btstack_transport_sco_i2s_test_bridge.c` implements SCO transport interface for UART-to-I2S test bridge 14btstack_uart: `btstack_uart_t` interface extends `btstack_uart_block_t`: 15 - supports sending and receiving SLIP frames for HCI H5 16 - suppports odd parity as well 17 - `hci_transport_h4` and chipset drivers have new functions to pass provide `btstack_uart_t` 18btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing `btstack_uart_block` drivers. 19hci_transport: add parity field and pass on to `btstack_uart_t` in h4 and h5 20 21### Fixed 22 23### Changed 24HCI: config I2S for BCM Controllers if `ENABLE_SCO_OVER_PCM`, reduce bit clock to 256/512 kHz 25btstack_uart_posix: supports SLIP frames and replaces `btstack_uart_block_posix` 26hci_transport_h5: new more performant H5 implementation that requires `btstack_uart_t` driver with SLIP support. 27POSIX Ports: use new `btstack_uart_posix` implementation 28posix-h5/posix-h5-bcm: use even parity for UART 29 30## Release v1.3.1 31 32### Added 33GAP: support for Classic Out-of-Band (OOB) pairing via `gap_ssp_remote_oob_data` with `ENABLE_CLASSIC_OOB_PAIRING` 34GAP: read local OOB data on start and on call to `gap_ssp_generate_oob_data`, provided via `GAP_EVENT_LOCAL_OOB_DATA` 35HID Host: add profile, update `hid_host_demo.c` example 36 37### Fixed 38L2CAP: make handling of HCI disconnect more robust 39AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect 40AVRCP: fix issue when Controller and Target send at the same time 41 42### Changed 43A2DP, AVDTP: use `a2dp_source_set_config_{TYPE}` and `avdtp_config{TYPE}_store` to avoid large number of parameters 44 45 46## Release v1.3 47 48### Added 49CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 50BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 51SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 52HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 53A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 54A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 55A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 56A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 57A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 58 59### Fixed 60HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 61L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 62HFP AG/HSP AG: avoid connecting to remote service with same role 63A2DP Source: support multiple Stream Endpoints with different Media Codec types 64A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 65GATT Compiler: support multiple instances of the same service 66 67### Changed 68GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 69HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 70AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 71AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 72A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 73GATT Client: Skip MTU exchange after MTU exchange on ATT Server 74Ports: STM32-F103RB Nucleo + CC256x port removed 75ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 76 77 78## Release v1.2.1 79 80### Fixed 81- L2CAP: use connection handle for channel lookups 82- L2CAP: forward data only in open state 83 84### Changed 85- L2CAP: check packet size against local mtu for classic basic channels 86 87 88## Release v1.2 89 90### Fixed 91- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 92- SM: fix update of sc flag for re-encrypted connection in peripheral role 93- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 94- ESP32: fix audio sink driver 95 96### Added 97- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 98- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 99- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 100- SM: emit events for re-encryption started/complete when bonding information is available 101 102### Changed 103- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 104- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 105 106 107## Changes October 2020 108 109### Fixed 110- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 111- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 112- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 113- SM: set LinkKey flag to request CTKD if enabled 114- SM: store CTKD key with Public Identity Address 115- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 116- SM: start SMP Timeout when sending Security Request 117- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 118- HCI: fix reject of LE remote connection param request via HCI 119 120### Added 121- GAP: add `gap_get_link_key_for_bd_addr` 122- GAP: add `gap_bonded` to check if bonding information is available for active connection 123- SM: support h7 for CTKD 124 125### Changed 126- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 127- SM: block connection if encryption fails for bonded devices as Central 128- SM: support pairing as Central after failed re-ecnryption 129 130 131## Release v1.1 132 133### Fixed 134- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 135 136### Added 137 138### Changed 139 140 141## Changes September 2020 142 143### Fixed 144- HFP: fix parsing of ranges e.g. in +CIND responses 145- AVDTP, AVRCP: fix bugs due to transaction id overrun 146- A2DP Source: fix issues with stream configuration by sink 147- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 148 149### Added 150- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 151- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 152 153### Changed 154- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 155- HSP, HFP: allow to configure usable SCO packet types 156- cc256x: update CC256xC init script to v1.4 157- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 158 159## Changes August 2020 160 161### Fixed 162- ESP32: fix authentication for incoming Secure Connections 163- AVDTP: Fix forwarding of Delay reports 164- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 165- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 166 167### Added 168- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 169- GAP: request role change for classic connection via `gap_request_role` 170- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 171- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 172- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 173- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 174- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 175- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 176 177### Changed 178- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 179- GAP: 'gap_auto_connect_x' API deprecated. Please direclty manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 180- example/hid_host_demo: try to become master for incoming connections 181- btstack_run_loop: use btstack_assert instead of local while(true) 182- att_db_util: allow to reset att_db via `att_db_util_init` 183 184## Changes July 2020 185 186### Fixed 187- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 188- AVDTP: handle concurrent signaling establishment with reject and retry 189 190### Added 191- example/hid_host_demo: support reconnect from HID device 192- Crypto: support software AES128 for AES-CCM operations 193- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 194- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 195- 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 196- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 197- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 198 199### Changed 200- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 201 202 203## Changes June 2020 204 205### Fixed 206- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 207- SM: Fix validation of confirm value for secure connection Passkey entry 208- AVRCP: handle concurrent signaling establishment with reject and retry 209 210### Added 211- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 212- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 213- Windows port for Dialog DA14585 connected via serial port 214 215## Changes 216- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 217 218## Changes May 2020 219 220### Fixed 221- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 222- pbap_client: fix PBAP UUID len on connect message 223- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 224- A2DP Source: only connect to remote sink stream endpoints 225- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 226- hsp_hs: fix disconnect if audio not connected 227- hsp_ag: fix accept incoming connection 228 229### Added 230- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 231- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 232- cc256x: allow to specify power vector for each modulation type 233- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 234- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 235- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 236 237### Changed 238- L2CAP ERTM: send extended features request only once per HCI connection 239 240 241## Changes April 2020 242 243### Fixed 244- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 245- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 246 247### Added 248- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 249- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 250- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 251 252### Changed 253- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 254- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 255- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 256 257 258## Changes March 2020 259 260### Fixed 261- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 262- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 263 264### Added 265- GATT Client: allow to register for any notification/indication and/or any connection 266- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 267- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 268- btstack_util: added btstack_replace_bd_addr_placeholder 269 270### Changed 271- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 272- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 273 274 275## Changes Februar 2020 276 277### Fixed 278- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 279- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 280 281### Changed 282- hid_host_mode: allow sniff mode 283 284### Added 285- 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 286 287 288## Changes January 2020 289 290### Fixed 291- L2CAP ERTM: avoid read-after-free on decline of incoming connection 292- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 293- att_db_util: fix realloc of att db buffer for large attributes 294- btstack_tlv_posix: only keep last value in memory, fix delete operation 295- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 296 297### Added 298- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 299- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 300- ATT Server: validate request pdu length 301 302### Changed 303- Crypto: update AES-CMAC implementation to access all message bytes sequentially 304 305 306## Changes December 2019 307 308### Fixed 309- example/pan_lwip_http_server: use Network Access Point, CoD 310- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 311 312### Added 313 314### Changed 315- Updated CC256x initscript: CC256xC v1.3 316- ESP32: add CMake project files 317 318 319## Changes November 2019 320 321### Fixed 322- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 323- L2CAP: send LE Data Channel SDUs round robin with other data 324- L2CAP ERTM: send ERTM I-frames round robin with other data 325 326### Added 327- ATT Server: return error if request to send now for Notification or Indication already registered 328- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 329- btstack_run_loop_remove: return bool true if timer/data source was removed 330- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 331- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 332- lwip: add download test files to http server demo 333 334### Changed 335- Linked List: return bool true if item was removed 336 337 338## Changes October 2019 339 340### Fixed 341 342### Added 343- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 344- provide `btstack_assert(condition)` 345- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 346 347### Changed 348- libusb and posix ports: store bonding information in TLV 349 350 351## Changes September 2019 352 353### Fixed 354- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 355- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 356- GATT Client: allow Write Without Response independent of other requests 357 358### Added 359- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 360- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 361 362### Changed 363- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 364- bluetooth.h: extract internal defintitions to respective protocol layers 365- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 366 367 368## Changes August 2019 369 370### Fixed 371- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 372- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 373- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 374- L2CAP ERTM: stop timers on disconnect 375- L2CAP ERTM: fix sending of segmented SDUs 376- L2CAP ERTM: handle unsupported Information Response 377- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 378 379### Added 380- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 381 382## Changed 383- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 384- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 385- POSIX: use monotonic clock as timebase if available 386- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 387- HCI: Read Encryption Key Size after encryption was enabled 388- Errata 11838: 389 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 390 - GAP: validate encryption key size to emit GAP Security Levels 391 392## Changes July 2019 393 394### Fixed 395- SM: Fixed regression introduced in f3582630 396- L2CAP: avoid reading l2cap signaling command len out of bounds 397- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 398 399### Changed 400- SM: Start encryption upon receiving slave securiy request if bonded 401- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 402 403--- 404 405## Changes June 2019 406 407### Changed 408- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 409- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 410- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 411 412### Fixed 413- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 414- libusb: avoid use-after-free for SCO packets on disconnect 415 416### Added 417- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 418- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 419- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 420 421--- 422 423## Changes May 2019 424 425### Changed 426- ESP32: Configure SCO over HCI after power up 427- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 428 is defined, an explicit delete field is used to indicate an invalid entry. 429 430### Fixed 431- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 432 433### Added 434- gatt_client: emit query complete event for signed write operation 435- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 436 437--- 438 439## Changes April 2019 440 441### Changed 442- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 443 444### Fixed 445- hci: pad LE Scan response with zeroes 446- SM: store local CSRK 447- ATT DB: call write callback for validated signed writes 448- ATT Server: abort signed write validation on incoming new request 449- Bluetooth SIG web scraping tools updated 450- libusb: compiles for FreeBSD 451 452### Added 453 454--- 455 456## Changes March 2019 457 458### Changed 459- use Makefile for stm32-f4discovery-cc256x port 460- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 461 462### Fixed 463- SM: Use provided authentication requirements in slave security request 464 465### Added 466- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 467- SM: Track if connection encryption is based on LE Secure Connection pairing 468- ATT DB: Validate if connection encrypted is based on SC if requested 469- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 470- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 471- ESP32: erase nvs flash is newer nvs version found 472- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 473- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 474 475## Changes February 2019 476 477### Changed 478- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 479- btstack_audio: split interface into sink and source 480 481### Fixed 482- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 483- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 484 485### Added 486- example/a2dp_sink_demo: add target role, support volume control on both devices 487- example/audio_duplex: playback audio audio source on audio sink (test audio path) 488- btstack_audio_embedded: implement audio source path 489 490--- 491 492## Changes January 2019 493 494### Changed 495- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 496- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 497 498### Added 499- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 500- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 501- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 502- ad_parser: validate data element length fields in ad_iterator_has_more 503- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 504 505### Fixed 506- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 507- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 508- Crypto: directly process queued crypto operation on HCI result 509 510--- 511 512## Changes December 2018 513 514### Added 515- SM: generate and store ER / IR keys in TLV, unless manually set by application 516- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 517 518### Fixed 519- SM: fix internal buffer overrun during random address generation 520 521## Changes November 2018 522 523### Added 524- GAP: gap_le_connection_interval provides connection interval for conn handle 525- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 526- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 527- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 528- SM: generate and store ER / IR keys in TLV, unless manually set by application 529 530### Fixed 531- SM: prevent random address updates if gap_random_address_set was used 532- SM: fix internal buffer overrun that can cause storing of bonding information to fail 533- SM: ignore Slave Security Request after sending own Pairing Request 534- L2CAP: fix use after free on disconnect if ERTM is enabled 535- HFP: Handle multiple commands/responses in single RFCOMM packet 536- Memory Pools: clear all buffers before use 537 538--- 539 540## Changes October 2018 541 542### Added 543- SDP Server: queue incoming connections when already connected instead of rejecting them 544- 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. 545- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 546 547### Fixed 548- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 549- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 550- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 551- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 552- L2CAP ERTM: fix outgoing fragment management 553- HFP: decline incoming RFCOMM connection after outgoing connection was started 554- AVRCP: fix crash on disconnect of connection established by remote 555 556--- 557 558## Changes September 2018 559 560### Fixed 561- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 562- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 563- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 564- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 565- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 566- 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 567- RFCOMM: Avoid use-after-free on channel finalize 568- GATT Client: stop timer on disconnect - fixes use after free / crash 569 570### Added 571- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 572- 3rd-party: yxml is used for PBAP vCard list parsing 573- cc256xC: new v1.1 init scripts 574 575--- 576 577## Changes August 2018 578 579### Added 580- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 581 582### Fixed 583- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 584- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 585- SM: drop LTK flag from Pairing Response for Secure Connections 586- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 587 588## Changes June 2018 589 590### Added 591- btstack_audio.h: application level API for audio playback and recording 592- embedded/hal_audio.h: low-level API for audio playback and recording 593- HID Device: hid_device_connect(..) function 594- ESP32: implement hal_audio 595- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 596- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 597 598### Changed 599- Errata 10734: 600 - SM: Generate new EC Public Keypair after each pairing 601 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 602- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 603- windows: ignore virtual Bluetooth adapter provided by VMware 604- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 605 606--- 607 608## Changes June 2018 609 610### Fixed 611- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 612- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 613- AVRCP Controller: fix parsing of now playing info 614 615### Changed 616- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 617 618### Added 619- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 620 621--- 622 623## Changes May 2018 624 625### Added 626- GAP: re-encrypt outgoing connection if bonded 627- ATT Server: wait until re-encryption is complete 628- GATT Client: wait until re-encryption is complete 629- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 630- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 631 632### Changed 633- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 634 635### Fixed 636- SM: Fix LE Secure Connection pairing in Central role 637- le_device_db_tlv: fix seq nr management 638- SM: improve le_device_db lookup and storing of IRK 639- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 640- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 641 642--- 643 644## Changes April 2018 645 646### Added 647- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 648- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 649- Embedded: support btstack_stdin via SEGGER RTT 650 651### Changed 652- att_db_util: added security requirement arguments to characteristic creators 653- SM: use btstack_crypto for cryptographpic functions 654- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 655 656### Fixed 657- HFP: fix answer call command 658- HCI: fix buffer overrun in gap_inquiry_explode 659- SDP: free service record item on sdp_unregister_service 660 661## Changes March 2018 662 663### Added 664- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 665- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 666- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 667 668### Fixed 669- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 670- HSP HS: accept incomming SCO connection 671- SM: fix iteration over LE Device DB entries for bonding and address resolving 672- SM: store pairing information only if both devices have requested bonding 673 674--- 675 676## Changes February 2018 677 678### Added 679- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 680- SM: new event SM_EVENT_PAIRING_COMPLETE 681- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 682- GAP: add gap_delete_all_link_keys 683 684### Changed 685- GATT Client: round robin for multiple connections 686- ATT Dispatch: round robin for ATT Server & GATT Client 687- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 688- btstack_link_key_db: addition functions for link key iteration 689- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 690- CSR: set all keys in psram instead of default 691 692### Fixed 693- tc3556x: fix startup after baud rate change 694 695--- 696 697## Changes January 2018 698 699### Added 700- Port for Windows with Zephyr HCI Firmware connected via serial port 701- em9304: upload patch containers during HCI bootup 702- Makefile for STM32-F4Discovery port 703- support for console out via SEGGER RTT 704- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 705- LE Streamer Client can send as fast as possbile as well 706- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 707 708### Changed 709- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 710- GAP: gap_set_connection_parameters includes scan interval and window params 711- GATT Client: GATT_EVENT_MTU indicates max MTU 712- ATT DB Util: attribute handle is returned for new Services and Characteristics 713 714### Fixed 715- Windows: retry serial port operations if not all bytes have been read/written 716- HFP: avoid buffer overflows setting up messages 717- SBC Decoder: improved error handling for invalid SBC audio data 718- GAP: fix Connection Parameter Response in Central role 719- ATT DB Util: update pointer to database in case of realloc 720- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 721- GAP: release HCI Connnection after gap_le_conne 722- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 723 724--- 725 726## Changes December 2017 727 728### Added 729- Introduced btstack_network.h network interface abstraction 730- btstack_network_posix implementation using Linux tun/tap interface 731- WICED: support for btstack_stdin (HAVE_STDIN) 732- 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. 733- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 734- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 735- LE Device DB TLV: overwrite oldest entry if no free entries available 736- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 737- Example/hid_host_demo with HID parser and support for basic US keyboard layout 738- 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 739- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 740 741### Changed 742- panu_demo: uses btstack_network.h now 743- WICED: configure printf to replace Linefeed with CRLF 744- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 745 746### Fixed 747- RFCOMM: support connection requests during connection failure 748- L2CAP: support connection requests during connection failure 749- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 750- HCI: avoid double free during halting 751- SM: fixed reconnect using legacy pairing in slave role 752 753 754