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