1# Change Log 2All notable changes to this project will be documented in this file. 3 4The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) 5and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html). 6 7--- 8 9## Unreleased 10 11### Added 12### Fixed 13### Changed 14 15 16## Release v1.3 17 18### Added 19CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 20BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 21SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 22HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 23A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 24A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 25A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 26A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 27A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 28 29### Fixed 30HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 31L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 32HFP AG/HSP AG: avoid connecting to remote service with same role 33A2DP Source: support multiple Stream Endpoints with different Media Codec types 34A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 35GATT Compiler: support multiple instances of the same service 36 37### Changed 38GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 39HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 40AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 41AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 42A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 43GATT Client: Skip MTU exchange after MTU exchange on ATT Server 44Ports: STM32-F103RB Nucleo + CC256x port removed 45ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 46 47 48## Release v1.2.1 49 50### Fixed 51- L2CAP: use connection handle for channel lookups 52- L2CAP: forward data only in open state 53 54### Changed 55- L2CAP: check packet size against local mtu for classic basic channels 56 57 58## Release v1.2 59 60### Fixed 61- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 62- SM: fix update of sc flag for re-encrypted connection in peripheral role 63- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 64- ESP32: fix audio sink driver 65 66### Added 67- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 68- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 69- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 70- SM: emit events for re-encryption started/complete when bonding information is available 71 72### Changed 73- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 74- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 75 76 77## Changes October 2020 78 79### Fixed 80- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 81- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 82- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 83- SM: set LinkKey flag to request CTKD if enabled 84- SM: store CTKD key with Public Identity Address 85- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 86- SM: start SMP Timeout when sending Security Request 87- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 88- HCI: fix reject of LE remote connection param request via HCI 89 90### Added 91- GAP: add `gap_get_link_key_for_bd_addr` 92- GAP: add `gap_bonded` to check if bonding information is available for active connection 93- SM: support h7 for CTKD 94 95### Changed 96- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 97- SM: block connection if encryption fails for bonded devices as Central 98- SM: support pairing as Central after failed re-ecnryption 99 100 101## Release v1.1 102 103### Fixed 104- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 105 106### Added 107 108### Changed 109 110 111## Changes September 2020 112 113### Fixed 114- HFP: fix parsing of ranges e.g. in +CIND responses 115- AVDTP, AVRCP: fix bugs due to transaction id overrun 116- A2DP Source: fix issues with stream configuration by sink 117- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 118 119### Added 120- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 121- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 122 123### Changed 124- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 125- HSP, HFP: allow to configure usable SCO packet types 126- cc256x: update CC256xC init script to v1.4 127- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 128 129## Changes August 2020 130 131### Fixed 132- ESP32: fix authentication for incoming Secure Connections 133- AVDTP: Fix forwarding of Delay reports 134- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 135- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 136 137### Added 138- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 139- GAP: request role change for classic connection via `gap_request_role` 140- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 141- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 142- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 143- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 144- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 145- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 146 147### Changed 148- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 149- GAP: 'gap_auto_connect_x' API deprecated. Please direclty manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 150- example/hid_host_demo: try to become master for incoming connections 151- btstack_run_loop: use btstack_assert instead of local while(true) 152- att_db_util: allow to reset att_db via `att_db_util_init` 153 154## Changes July 2020 155 156### Fixed 157- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 158- AVDTP: handle concurrent signaling establishment with reject and retry 159 160### Added 161- example/hid_host_demo: support reconnect from HID device 162- Crypto: support software AES128 for AES-CCM operations 163- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 164- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 165- 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 166- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 167- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 168 169### Changed 170- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 171 172 173## Changes June 2020 174 175### Fixed 176- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 177- SM: Fix validation of confirm value for secure connection Passkey entry 178- AVRCP: handle concurrent signaling establishment with reject and retry 179 180### Added 181- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 182- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 183- Windows port for Dialog DA14585 connected via serial port 184 185## Changes 186- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 187 188## Changes May 2020 189 190### Fixed 191- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 192- pbap_client: fix PBAP UUID len on connect message 193- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 194- A2DP Source: only connect to remote sink stream endpoints 195- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 196- hsp_hs: fix disconnect if audio not connected 197- hsp_ag: fix accept incoming connection 198 199### Added 200- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 201- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 202- cc256x: allow to specify power vector for each modulation type 203- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 204- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 205- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 206 207### Changed 208- L2CAP ERTM: send extended features request only once per HCI connection 209 210 211## Changes April 2020 212 213### Fixed 214- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 215- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 216 217### Added 218- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 219- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 220- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 221 222### Changed 223- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 224- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 225- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 226 227 228## Changes March 2020 229 230### Fixed 231- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 232- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 233 234### Added 235- GATT Client: allow to register for any notification/indication and/or any connection 236- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 237- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 238- btstack_util: added btstack_replace_bd_addr_placeholder 239 240### Changed 241- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 242- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 243 244 245## Changes Februar 2020 246 247### Fixed 248- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 249- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 250 251### Changed 252- hid_host_mode: allow sniff mode 253 254### Added 255- 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 256 257 258## Changes January 2020 259 260### Fixed 261- L2CAP ERTM: avoid read-after-free on decline of incoming connection 262- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 263- att_db_util: fix realloc of att db buffer for large attributes 264- btstack_tlv_posix: only keep last value in memory, fix delete operation 265- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 266 267### Added 268- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 269- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 270- ATT Server: validate request pdu length 271 272### Changed 273- Crypto: update AES-CMAC implementation to access all message bytes sequentially 274 275 276## Changes December 2019 277 278### Fixed 279- example/pan_lwip_http_server: use Network Access Point, CoD 280- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 281 282### Added 283 284### Changed 285- Updated CC256x initscript: CC256xC v1.3 286- ESP32: add CMake project files 287 288 289## Changes November 2019 290 291### Fixed 292- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 293- L2CAP: send LE Data Channel SDUs round robin with other data 294- L2CAP ERTM: send ERTM I-frames round robin with other data 295 296### Added 297- ATT Server: return error if request to send now for Notification or Indication already registered 298- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 299- btstack_run_loop_remove: return bool true if timer/data source was removed 300- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 301- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 302- lwip: add download test files to http server demo 303 304### Changed 305- Linked List: return bool true if item was removed 306 307 308## Changes October 2019 309 310### Fixed 311 312### Added 313- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 314- provide `btstack_assert(condition)` 315- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 316 317### Changed 318- libusb and posix ports: store bonding information in TLV 319 320 321## Changes September 2019 322 323### Fixed 324- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 325- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 326- GATT Client: allow Write Without Response independent of other requests 327 328### Added 329- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 330- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 331 332### Changed 333- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 334- bluetooth.h: extract internal defintitions to respective protocol layers 335- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 336 337 338## Changes August 2019 339 340### Fixed 341- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 342- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 343- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 344- L2CAP ERTM: stop timers on disconnect 345- L2CAP ERTM: fix sending of segmented SDUs 346- L2CAP ERTM: handle unsupported Information Response 347- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 348 349### Added 350- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 351 352## Changed 353- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 354- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 355- POSIX: use monotonic clock as timebase if available 356- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 357- HCI: Read Encryption Key Size after encryption was enabled 358- Errata 11838: 359 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 360 - GAP: validate encryption key size to emit GAP Security Levels 361 362## Changes July 2019 363 364### Fixed 365- SM: Fixed regression introduced in f3582630 366- L2CAP: avoid reading l2cap signaling command len out of bounds 367- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 368 369### Changed 370- SM: Start encryption upon receiving slave securiy request if bonded 371- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 372 373--- 374 375## Changes June 2019 376 377### Changed 378- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 379- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 380- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 381 382### Fixed 383- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 384- libusb: avoid use-after-free for SCO packets on disconnect 385 386### Added 387- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 388- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 389- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 390 391--- 392 393## Changes May 2019 394 395### Changed 396- ESP32: Configure SCO over HCI after power up 397- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 398 is defined, an explicit delete field is used to indicate an invalid entry. 399 400### Fixed 401- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 402 403### Added 404- gatt_client: emit query complete event for signed write operation 405- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 406 407--- 408 409## Changes April 2019 410 411### Changed 412- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 413 414### Fixed 415- hci: pad LE Scan response with zeroes 416- SM: store local CSRK 417- ATT DB: call write callback for validated signed writes 418- ATT Server: abort signed write validation on incoming new request 419- Bluetooth SIG web scraping tools updated 420- libusb: compiles for FreeBSD 421 422### Added 423 424--- 425 426## Changes March 2019 427 428### Changed 429- use Makefile for stm32-f4discovery-cc256x port 430- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 431 432### Fixed 433- SM: Use provided authentication requirements in slave security request 434 435### Added 436- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 437- SM: Track if connection encryption is based on LE Secure Connection pairing 438- ATT DB: Validate if connection encrypted is based on SC if requested 439- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 440- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 441- ESP32: erase nvs flash is newer nvs version found 442- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 443- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 444 445## Changes February 2019 446 447### Changed 448- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 449- btstack_audio: split interface into sink and source 450 451### Fixed 452- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 453- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 454 455### Added 456- example/a2dp_sink_demo: add target role, support volume control on both devices 457- example/audio_duplex: playback audio audio source on audio sink (test audio path) 458- btstack_audio_embedded: implement audio source path 459 460--- 461 462## Changes January 2019 463 464### Changed 465- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 466- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 467 468### Added 469- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 470- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 471- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 472- ad_parser: validate data element length fields in ad_iterator_has_more 473- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 474 475### Fixed 476- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 477- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 478- Crypto: directly process queued crypto operation on HCI result 479 480--- 481 482## Changes December 2018 483 484### Added 485- SM: generate and store ER / IR keys in TLV, unless manually set by application 486- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 487 488### Fixed 489- SM: fix internal buffer overrun during random address generation 490 491## Changes November 2018 492 493### Added 494- GAP: gap_le_connection_interval provides connection interval for conn handle 495- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 496- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 497- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 498- SM: generate and store ER / IR keys in TLV, unless manually set by application 499 500### Fixed 501- SM: prevent random address updates if gap_random_address_set was used 502- SM: fix internal buffer overrun that can cause storing of bonding information to fail 503- SM: ignore Slave Security Request after sending own Pairing Request 504- L2CAP: fix use after free on disconnect if ERTM is enabled 505- HFP: Handle multiple commands/responses in single RFCOMM packet 506- Memory Pools: clear all buffers before use 507 508--- 509 510## Changes October 2018 511 512### Added 513- SDP Server: queue incoming connections when already connected instead of rejecting them 514- 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. 515- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 516 517### Fixed 518- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 519- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 520- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 521- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 522- L2CAP ERTM: fix outgoing fragment management 523- HFP: decline incoming RFCOMM connection after outgoing connection was started 524- AVRCP: fix crash on disconnect of connection established by remote 525 526--- 527 528## Changes September 2018 529 530### Fixed 531- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 532- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 533- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 534- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 535- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 536- 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 537- RFCOMM: Avoid use-after-free on channel finalize 538- GATT Client: stop timer on disconnect - fixes use after free / crash 539 540### Added 541- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 542- 3rd-party: yxml is used for PBAP vCard list parsing 543- cc256xC: new v1.1 init scripts 544 545--- 546 547## Changes August 2018 548 549### Added 550- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 551 552### Fixed 553- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 554- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 555- SM: drop LTK flag from Pairing Response for Secure Connections 556- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 557 558## Changes June 2018 559 560### Added 561- btstack_audio.h: application level API for audio playback and recording 562- embedded/hal_audio.h: low-level API for audio playback and recording 563- HID Device: hid_device_connect(..) function 564- ESP32: implement hal_audio 565- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 566- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 567 568### Changed 569- Errata 10734: 570 - SM: Generate new EC Public Keypair after each pairing 571 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 572- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 573- windows: ignore virtual Bluetooth adapter provided by VMware 574- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 575 576--- 577 578## Changes June 2018 579 580### Fixed 581- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 582- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 583- AVRCP Controller: fix parsing of now playing info 584 585### Changed 586- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 587 588### Added 589- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 590 591--- 592 593## Changes May 2018 594 595### Added 596- GAP: re-encrypt outgoing connection if bonded 597- ATT Server: wait until re-encryption is complete 598- GATT Client: wait until re-encryption is complete 599- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 600- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 601 602### Changed 603- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 604 605### Fixed 606- SM: Fix LE Secure Connection pairing in Central role 607- le_device_db_tlv: fix seq nr management 608- SM: improve le_device_db lookup and storing of IRK 609- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 610- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 611 612--- 613 614## Changes April 2018 615 616### Added 617- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 618- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 619- Embedded: support btstack_stdin via SEGGER RTT 620 621### Changed 622- att_db_util: added security requirement arguments to characteristic creators 623- SM: use btstack_crypto for cryptographpic functions 624- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 625 626### Fixed 627- HFP: fix answer call command 628- HCI: fix buffer overrun in gap_inquiry_explode 629- SDP: free service record item on sdp_unregister_service 630 631## Changes March 2018 632 633### Added 634- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 635- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 636- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 637 638### Fixed 639- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 640- HSP HS: accept incomming SCO connection 641- SM: fix iteration over LE Device DB entries for bonding and address resolving 642- SM: store pairing information only if both devices have requested bonding 643 644--- 645 646## Changes February 2018 647 648### Added 649- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 650- SM: new event SM_EVENT_PAIRING_COMPLETE 651- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 652- GAP: add gap_delete_all_link_keys 653 654### Changed 655- GATT Client: round robin for multiple connections 656- ATT Dispatch: round robin for ATT Server & GATT Client 657- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 658- btstack_link_key_db: addition functions for link key iteration 659- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 660- CSR: set all keys in psram instead of default 661 662### Fixed 663- tc3556x: fix startup after baud rate change 664 665--- 666 667## Changes January 2018 668 669### Added 670- Port for Windows with Zephyr HCI Firmware connected via serial port 671- em9304: upload patch containers during HCI bootup 672- Makefile for STM32-F4Discovery port 673- support for console out via SEGGER RTT 674- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 675- LE Streamer Client can send as fast as possbile as well 676- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 677 678### Changed 679- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 680- GAP: gap_set_connection_parameters includes scan interval and window params 681- GATT Client: GATT_EVENT_MTU indicates max MTU 682- ATT DB Util: attribute handle is returned for new Services and Characteristics 683 684### Fixed 685- Windows: retry serial port operations if not all bytes have been read/written 686- HFP: avoid buffer overflows setting up messages 687- SBC Decoder: improved error handling for invalid SBC audio data 688- GAP: fix Connection Parameter Response in Central role 689- ATT DB Util: update pointer to database in case of realloc 690- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 691- GAP: release HCI Connnection after gap_le_conne 692- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 693 694--- 695 696## Changes December 2017 697 698### Added 699- Introduced btstack_network.h network interface abstraction 700- btstack_network_posix implementation using Linux tun/tap interface 701- WICED: support for btstack_stdin (HAVE_STDIN) 702- 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. 703- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 704- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 705- LE Device DB TLV: overwrite oldest entry if no free entries available 706- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 707- Example/hid_host_demo with HID parser and support for basic US keyboard layout 708- 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 709- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 710 711### Changed 712- panu_demo: uses btstack_network.h now 713- WICED: configure printf to replace Linefeed with CRLF 714- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 715 716### Fixed 717- RFCOMM: support connection requests during connection failure 718- L2CAP: support connection requests during connection failure 719- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 720- HCI: avoid double free during halting 721- SM: fixed reconnect using legacy pairing in slave role 722 723 724