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