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