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 12HCI: `btstack_transport_sco.h` allows to support SCO over physical PCM/I2S interface (`HAVE_SCO_TRANSPORT`) 13POSIX: `btstack_transport_sco_i2s_test_bridge.c` implements SCO transport interface for UART-to-I2S test bridge 14btstack_uart: `btstack_uart_t` interface extends `btstack_uart_block_t`: 15 - supports sending and receiving SLIP frames for HCI H5 16 - suppports odd parity as well 17 - `hci_transport_h4` and chipset drivers have new functions to pass provide `btstack_uart_t` 18 19btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing `btstack_uart_block` drivers. 20hci_transport: add parity field and pass on to `btstack_uart_t` in h4 and h5 21 22### Fixed 23 24### Changed 25HCI: config I2S for BCM Controllers if `ENABLE_SCO_OVER_PCM`, reduce bit clock to 256/512 kHz 26btstack_uart_posix: supports SLIP frames and replaces `btstack_uart_block_posix` 27hci_transport_h5: new more performant H5 implementation that requires `btstack_uart_t` driver with SLIP support. 28POSIX Ports: use new `btstack_uart_posix` implementation 29posix-h5/posix-h5-bcm: use even parity for UART 30Port Archive: moved ports that are not recommended for new designs to port/archive folder: 31 - MSP430: the ports used the older community GCC version without 20-bit support needed for code size > 64kB 32 - Broadcom/Cypress H5: uploading PatchRAM is only possible in H4 mode. It's better to also use H4 in general 33 - PIC32-Harmony: the port used Harmony v1 while Harmony v3 has been out since a while. 34 35btstack_run_loop_base: used for posix, embedded, freertos, nrf5-zephyr, wiced, windows run loop implementations. 36 37## Release v1.3.1 38 39### Added 40GAP: support for Classic Out-of-Band (OOB) pairing via `gap_ssp_remote_oob_data` with `ENABLE_CLASSIC_OOB_PAIRING` 41GAP: read local OOB data on start and on call to `gap_ssp_generate_oob_data`, provided via `GAP_EVENT_LOCAL_OOB_DATA` 42HID Host: add profile, update `hid_host_demo.c` example 43 44### Fixed 45L2CAP: make handling of HCI disconnect more robust 46AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect 47AVRCP: fix issue when Controller and Target send at the same time 48 49### Changed 50A2DP, AVDTP: use `a2dp_source_set_config_{TYPE}` and `avdtp_config{TYPE}_store` to avoid large number of parameters 51 52 53## Release v1.3 54 55### Added 56CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 57BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 58SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 59HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 60A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 61A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 62A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 63A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 64A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 65 66### Fixed 67HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 68L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 69HFP AG/HSP AG: avoid connecting to remote service with same role 70A2DP Source: support multiple Stream Endpoints with different Media Codec types 71A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 72GATT Compiler: support multiple instances of the same service 73 74### Changed 75GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 76HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 77AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 78AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 79A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 80GATT Client: Skip MTU exchange after MTU exchange on ATT Server 81Ports: STM32-F103RB Nucleo + CC256x port removed 82ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 83 84 85## Release v1.2.1 86 87### Fixed 88- L2CAP: use connection handle for channel lookups 89- L2CAP: forward data only in open state 90 91### Changed 92- L2CAP: check packet size against local mtu for classic basic channels 93 94 95## Release v1.2 96 97### Fixed 98- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 99- SM: fix update of sc flag for re-encrypted connection in peripheral role 100- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 101- ESP32: fix audio sink driver 102 103### Added 104- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 105- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 106- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 107- SM: emit events for re-encryption started/complete when bonding information is available 108 109### Changed 110- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 111- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 112 113 114## Changes October 2020 115 116### Fixed 117- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 118- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 119- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 120- SM: set LinkKey flag to request CTKD if enabled 121- SM: store CTKD key with Public Identity Address 122- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 123- SM: start SMP Timeout when sending Security Request 124- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 125- HCI: fix reject of LE remote connection param request via HCI 126 127### Added 128- GAP: add `gap_get_link_key_for_bd_addr` 129- GAP: add `gap_bonded` to check if bonding information is available for active connection 130- SM: support h7 for CTKD 131 132### Changed 133- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 134- SM: block connection if encryption fails for bonded devices as Central 135- SM: support pairing as Central after failed re-ecnryption 136 137 138## Release v1.1 139 140### Fixed 141- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 142 143### Added 144 145### Changed 146 147 148## Changes September 2020 149 150### Fixed 151- HFP: fix parsing of ranges e.g. in +CIND responses 152- AVDTP, AVRCP: fix bugs due to transaction id overrun 153- A2DP Source: fix issues with stream configuration by sink 154- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 155 156### Added 157- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 158- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 159 160### Changed 161- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 162- HSP, HFP: allow to configure usable SCO packet types 163- cc256x: update CC256xC init script to v1.4 164- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 165 166## Changes August 2020 167 168### Fixed 169- ESP32: fix authentication for incoming Secure Connections 170- AVDTP: Fix forwarding of Delay reports 171- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 172- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 173 174### Added 175- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 176- GAP: request role change for classic connection via `gap_request_role` 177- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 178- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 179- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 180- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 181- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 182- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 183 184### Changed 185- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 186- GAP: 'gap_auto_connect_x' API deprecated. Please direclty manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 187- example/hid_host_demo: try to become master for incoming connections 188- btstack_run_loop: use btstack_assert instead of local while(true) 189- att_db_util: allow to reset att_db via `att_db_util_init` 190 191## Changes July 2020 192 193### Fixed 194- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 195- AVDTP: handle concurrent signaling establishment with reject and retry 196 197### Added 198- example/hid_host_demo: support reconnect from HID device 199- Crypto: support software AES128 for AES-CCM operations 200- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 201- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 202- 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 203- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 204- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 205 206### Changed 207- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 208 209 210## Changes June 2020 211 212### Fixed 213- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 214- SM: Fix validation of confirm value for secure connection Passkey entry 215- AVRCP: handle concurrent signaling establishment with reject and retry 216 217### Added 218- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 219- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 220- Windows port for Dialog DA14585 connected via serial port 221 222## Changes 223- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 224 225## Changes May 2020 226 227### Fixed 228- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 229- pbap_client: fix PBAP UUID len on connect message 230- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 231- A2DP Source: only connect to remote sink stream endpoints 232- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 233- hsp_hs: fix disconnect if audio not connected 234- hsp_ag: fix accept incoming connection 235 236### Added 237- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 238- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 239- cc256x: allow to specify power vector for each modulation type 240- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 241- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 242- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 243 244### Changed 245- L2CAP ERTM: send extended features request only once per HCI connection 246 247 248## Changes April 2020 249 250### Fixed 251- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 252- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 253 254### Added 255- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 256- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 257- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 258 259### Changed 260- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 261- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 262- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 263 264 265## Changes March 2020 266 267### Fixed 268- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 269- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 270 271### Added 272- GATT Client: allow to register for any notification/indication and/or any connection 273- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 274- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 275- btstack_util: added btstack_replace_bd_addr_placeholder 276 277### Changed 278- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 279- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 280 281 282## Changes Februar 2020 283 284### Fixed 285- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 286- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 287 288### Changed 289- hid_host_mode: allow sniff mode 290 291### Added 292- 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 293 294 295## Changes January 2020 296 297### Fixed 298- L2CAP ERTM: avoid read-after-free on decline of incoming connection 299- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 300- att_db_util: fix realloc of att db buffer for large attributes 301- btstack_tlv_posix: only keep last value in memory, fix delete operation 302- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 303 304### Added 305- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 306- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 307- ATT Server: validate request pdu length 308 309### Changed 310- Crypto: update AES-CMAC implementation to access all message bytes sequentially 311 312 313## Changes December 2019 314 315### Fixed 316- example/pan_lwip_http_server: use Network Access Point, CoD 317- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 318 319### Added 320 321### Changed 322- Updated CC256x initscript: CC256xC v1.3 323- ESP32: add CMake project files 324 325 326## Changes November 2019 327 328### Fixed 329- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 330- L2CAP: send LE Data Channel SDUs round robin with other data 331- L2CAP ERTM: send ERTM I-frames round robin with other data 332 333### Added 334- ATT Server: return error if request to send now for Notification or Indication already registered 335- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 336- btstack_run_loop_remove: return bool true if timer/data source was removed 337- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 338- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 339- lwip: add download test files to http server demo 340 341### Changed 342- Linked List: return bool true if item was removed 343 344 345## Changes October 2019 346 347### Fixed 348 349### Added 350- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 351- provide `btstack_assert(condition)` 352- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 353 354### Changed 355- libusb and posix ports: store bonding information in TLV 356 357 358## Changes September 2019 359 360### Fixed 361- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 362- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 363- GATT Client: allow Write Without Response independent of other requests 364 365### Added 366- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 367- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 368 369### Changed 370- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 371- bluetooth.h: extract internal defintitions to respective protocol layers 372- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 373 374 375## Changes August 2019 376 377### Fixed 378- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 379- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 380- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 381- L2CAP ERTM: stop timers on disconnect 382- L2CAP ERTM: fix sending of segmented SDUs 383- L2CAP ERTM: handle unsupported Information Response 384- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 385 386### Added 387- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 388 389## Changed 390- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 391- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 392- POSIX: use monotonic clock as timebase if available 393- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 394- HCI: Read Encryption Key Size after encryption was enabled 395- Errata 11838: 396 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 397 - GAP: validate encryption key size to emit GAP Security Levels 398 399## Changes July 2019 400 401### Fixed 402- SM: Fixed regression introduced in f3582630 403- L2CAP: avoid reading l2cap signaling command len out of bounds 404- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 405 406### Changed 407- SM: Start encryption upon receiving slave securiy request if bonded 408- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 409 410--- 411 412## Changes June 2019 413 414### Changed 415- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 416- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 417- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 418 419### Fixed 420- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 421- libusb: avoid use-after-free for SCO packets on disconnect 422 423### Added 424- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 425- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 426- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 427 428--- 429 430## Changes May 2019 431 432### Changed 433- ESP32: Configure SCO over HCI after power up 434- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 435 is defined, an explicit delete field is used to indicate an invalid entry. 436 437### Fixed 438- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 439 440### Added 441- gatt_client: emit query complete event for signed write operation 442- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 443 444--- 445 446## Changes April 2019 447 448### Changed 449- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 450 451### Fixed 452- hci: pad LE Scan response with zeroes 453- SM: store local CSRK 454- ATT DB: call write callback for validated signed writes 455- ATT Server: abort signed write validation on incoming new request 456- Bluetooth SIG web scraping tools updated 457- libusb: compiles for FreeBSD 458 459### Added 460 461--- 462 463## Changes March 2019 464 465### Changed 466- use Makefile for stm32-f4discovery-cc256x port 467- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 468 469### Fixed 470- SM: Use provided authentication requirements in slave security request 471 472### Added 473- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 474- SM: Track if connection encryption is based on LE Secure Connection pairing 475- ATT DB: Validate if connection encrypted is based on SC if requested 476- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 477- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 478- ESP32: erase nvs flash is newer nvs version found 479- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 480- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 481 482## Changes February 2019 483 484### Changed 485- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 486- btstack_audio: split interface into sink and source 487 488### Fixed 489- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 490- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 491 492### Added 493- example/a2dp_sink_demo: add target role, support volume control on both devices 494- example/audio_duplex: playback audio audio source on audio sink (test audio path) 495- btstack_audio_embedded: implement audio source path 496 497--- 498 499## Changes January 2019 500 501### Changed 502- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 503- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 504 505### Added 506- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 507- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 508- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 509- ad_parser: validate data element length fields in ad_iterator_has_more 510- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 511 512### Fixed 513- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 514- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 515- Crypto: directly process queued crypto operation on HCI result 516 517--- 518 519## Changes December 2018 520 521### Added 522- SM: generate and store ER / IR keys in TLV, unless manually set by application 523- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 524 525### Fixed 526- SM: fix internal buffer overrun during random address generation 527 528## Changes November 2018 529 530### Added 531- GAP: gap_le_connection_interval provides connection interval for conn handle 532- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 533- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 534- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 535- SM: generate and store ER / IR keys in TLV, unless manually set by application 536 537### Fixed 538- SM: prevent random address updates if gap_random_address_set was used 539- SM: fix internal buffer overrun that can cause storing of bonding information to fail 540- SM: ignore Slave Security Request after sending own Pairing Request 541- L2CAP: fix use after free on disconnect if ERTM is enabled 542- HFP: Handle multiple commands/responses in single RFCOMM packet 543- Memory Pools: clear all buffers before use 544 545--- 546 547## Changes October 2018 548 549### Added 550- SDP Server: queue incoming connections when already connected instead of rejecting them 551- 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. 552- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 553 554### Fixed 555- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 556- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 557- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 558- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 559- L2CAP ERTM: fix outgoing fragment management 560- HFP: decline incoming RFCOMM connection after outgoing connection was started 561- AVRCP: fix crash on disconnect of connection established by remote 562 563--- 564 565## Changes September 2018 566 567### Fixed 568- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 569- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 570- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 571- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 572- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 573- 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 574- RFCOMM: Avoid use-after-free on channel finalize 575- GATT Client: stop timer on disconnect - fixes use after free / crash 576 577### Added 578- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 579- 3rd-party: yxml is used for PBAP vCard list parsing 580- cc256xC: new v1.1 init scripts 581 582--- 583 584## Changes August 2018 585 586### Added 587- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 588 589### Fixed 590- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 591- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 592- SM: drop LTK flag from Pairing Response for Secure Connections 593- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 594 595## Changes June 2018 596 597### Added 598- btstack_audio.h: application level API for audio playback and recording 599- embedded/hal_audio.h: low-level API for audio playback and recording 600- HID Device: hid_device_connect(..) function 601- ESP32: implement hal_audio 602- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 603- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 604 605### Changed 606- Errata 10734: 607 - SM: Generate new EC Public Keypair after each pairing 608 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 609- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 610- windows: ignore virtual Bluetooth adapter provided by VMware 611- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 612 613--- 614 615## Changes June 2018 616 617### Fixed 618- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 619- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 620- AVRCP Controller: fix parsing of now playing info 621 622### Changed 623- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 624 625### Added 626- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 627 628--- 629 630## Changes May 2018 631 632### Added 633- GAP: re-encrypt outgoing connection if bonded 634- ATT Server: wait until re-encryption is complete 635- GATT Client: wait until re-encryption is complete 636- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 637- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 638 639### Changed 640- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 641 642### Fixed 643- SM: Fix LE Secure Connection pairing in Central role 644- le_device_db_tlv: fix seq nr management 645- SM: improve le_device_db lookup and storing of IRK 646- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 647- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 648 649--- 650 651## Changes April 2018 652 653### Added 654- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 655- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 656- Embedded: support btstack_stdin via SEGGER RTT 657 658### Changed 659- att_db_util: added security requirement arguments to characteristic creators 660- SM: use btstack_crypto for cryptographpic functions 661- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 662 663### Fixed 664- HFP: fix answer call command 665- HCI: fix buffer overrun in gap_inquiry_explode 666- SDP: free service record item on sdp_unregister_service 667 668## Changes March 2018 669 670### Added 671- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 672- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 673- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 674 675### Fixed 676- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 677- HSP HS: accept incomming SCO connection 678- SM: fix iteration over LE Device DB entries for bonding and address resolving 679- SM: store pairing information only if both devices have requested bonding 680 681--- 682 683## Changes February 2018 684 685### Added 686- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 687- SM: new event SM_EVENT_PAIRING_COMPLETE 688- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 689- GAP: add gap_delete_all_link_keys 690 691### Changed 692- GATT Client: round robin for multiple connections 693- ATT Dispatch: round robin for ATT Server & GATT Client 694- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 695- btstack_link_key_db: addition functions for link key iteration 696- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 697- CSR: set all keys in psram instead of default 698 699### Fixed 700- tc3556x: fix startup after baud rate change 701 702--- 703 704## Changes January 2018 705 706### Added 707- Port for Windows with Zephyr HCI Firmware connected via serial port 708- em9304: upload patch containers during HCI bootup 709- Makefile for STM32-F4Discovery port 710- support for console out via SEGGER RTT 711- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 712- LE Streamer Client can send as fast as possbile as well 713- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 714 715### Changed 716- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 717- GAP: gap_set_connection_parameters includes scan interval and window params 718- GATT Client: GATT_EVENT_MTU indicates max MTU 719- ATT DB Util: attribute handle is returned for new Services and Characteristics 720 721### Fixed 722- Windows: retry serial port operations if not all bytes have been read/written 723- HFP: avoid buffer overflows setting up messages 724- SBC Decoder: improved error handling for invalid SBC audio data 725- GAP: fix Connection Parameter Response in Central role 726- ATT DB Util: update pointer to database in case of realloc 727- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 728- GAP: release HCI Connnection after gap_le_conne 729- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 730 731--- 732 733## Changes December 2017 734 735### Added 736- Introduced btstack_network.h network interface abstraction 737- btstack_network_posix implementation using Linux tun/tap interface 738- WICED: support for btstack_stdin (HAVE_STDIN) 739- 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. 740- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 741- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 742- LE Device DB TLV: overwrite oldest entry if no free entries available 743- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 744- Example/hid_host_demo with HID parser and support for basic US keyboard layout 745- 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 746- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 747 748### Changed 749- panu_demo: uses btstack_network.h now 750- WICED: configure printf to replace Linefeed with CRLF 751- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 752 753### Fixed 754- RFCOMM: support connection requests during connection failure 755- L2CAP: support connection requests during connection failure 756- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 757- HCI: avoid double free during halting 758- SM: fixed reconnect using legacy pairing in slave role 759 760 761