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