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- GAP: support periodic advertising with ENABLE_LE_PERIODIC_ADVERTISING 13- GAP: support periodic inquiry mode with gap_inquiry_periodic_start 14- HFP HF: provide Calling Line Identification alpha field 15- HFP HF: emit HFP_SUBEVENT_TRANSMIT_DTMF_CODES after sending DTMF command 16 17### Fixed 18- L2CAP: Fix accept incoming ERTM connection when Information Request already complete 19- HFP AG: activate all AG indicators upon service level connection establishment 20 21### Changed 22- A2DP: new a2dp.c contains shared code of Sink and Source roles 23- A2DP Sink: automatically configure stream endpoint for outgoing connections 24 25## Release v1.5.2 26 27### Added 28- GAP: ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS serializes Inquiry, Remote Name Request and Create Connection operations 29- GAP: support extended advertising with ENABLE_LE_EXTENDED_ADVERTISING 30- GAP: gap_enable_link_watchdog() uses automatic flush timeout to disconnect if data cannot be sent 31- GAP: gap_secure_connections_active() to query if BR/EDR Secure Connecions are possible 32- ATT DB: provide gatt_server_get_handle_range_for_service_with_uuid16 to find included service within handle range 33- GATT Service: Audio Input Control Service Server (AICS 1.0) 34- GATT Service: Microphone Control Service Server (MCS 1.0) 35- GATT Service: Volume Control Service Server (VCS 1.0) 36- GATT Service: Volume Offset Control Service Server (VOCS 1.0) 37 38### Fixed 39- POSIX: fix RTS/CTS configuration by keeping local termios copy in btstack_uart_posix 40- HCI: fix handling of HCI Connection Complete with error (regression introduced in v1.5.1) 41- GAP: disable scanning, advertising, connection before updating random address 42- GAP: fix LE Scan with whitelist 43- HFP_AG: fix tracking for call dropped during outgoing ringing 44- HFP: Free HFP Connection object on SDP error / Service not found 45- PBAP Client: emit operation complete with status OBEX_ABORTED 46 47### Changed 48- Chipset: use da145xx in folder/file/function names for Dialog Semiconductor SoCs 49- GAP: set min encryption key size during init, if supported 50- AVDTP: use BLUETOOTH_SERVICE_CLASS_AUDIO_SINK / SOURCE instead of BLUETOOTH_PROTOCOL_AVDTP in SDP queries 51- ATT Server: use uint8_t for status returns 52- libusb, POSIX and Windows ports: use '-' instead of ':' in btstack_BD_ADDR.tlv filename 53 54 55## Release v1.5.1 56 57### Added 58- GOEP Client: add goep_client_version_20_or_higher 59- ESP32: implement audio source 60 61### Fixed 62- PBAP Client: support disconnect while operation is ongoing 63- PBAP Client: use SRM only if GOEP v2.0 or higher connection 64- PBAP Client: emit vCard entry data as PBAP_DATA_PACKET 65- L2CAP: limit remote MTU by local tx configuration in ERTM 66 67### Changed 68- Example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation 69- ESP32: update sdkconfig for esp-idf v4.3, disable Bluedroid host stack 70- ESP32: use I2S configuration from ESP32 LyraT V4.3 71 72 73## Release v1.5.0 74 75### Added 76- HCI Dump: Support BTSnoop format in hci_dump_posix_fs.c for format = HCI_DUMP_BTSNOOP 77- HCI Dump RTT STDOUT: drop messages if RTT buffer is full and RTT is configured for non-blocking 78- HCI: hci_remove_event_handler to remove packet handler 79- hci_cmd: support variable length fields and arrayed parameters 80- GAP: ENABLE_EXPLICIT_LINK_KEY_REPLY allows for asynchronous link key lookup by application 81- GAP: gap_set_page_timeout to set Page Timeout 82- GAP: gap_inquiry_set_scan_activity to set Inquiry Scan Activity 83- L2CAP: emit L2CAP_EVENT_INFORMATION_RESPONSE event with extended features and fixed channels supported 84- L2CAP: support Enhanced Credit-based Flow-Control Mode for connection-oriented channels over BR/EDR/LE 85- A2DP: allow to register media codec validator for sink and source with: 86 - `a2dp_sink_register_media_config_validator` 87 - `a2dp_source_register_media_config_validator` 88- A2DP Sink: allow accept or reject of stream start on A2DP_SUBEVENT_START_STREAM_REQUESTED when ENABLE_AVDTP_ACCEPTOR_EXPLICIT_START_STREAM_CONFIRMATION is defined 89- OBEX: new obex_parser for chunked OBEX data 90- SM: Support Cross-Transport Key-Derivation (CTKD) of LE LTK from BR/EDR SC Link Key in Responder role 91- SM: sm_remove_event_handler to remove packet handler 92- GATT Service: Bond Management Service (BMS 1.0) Server 93- GATT Service: Microphone Control Service (MICS 1.0) Server 94- GATT Service: TX Power Service (TPS 1.0) Server 95- POSIX: btstack_signal allows to register for callback on signal, e.g. ctrl-c 96- Windows: btstack_stdin_window_register_ctrl_c_callback allows to register for ctrl-c 97 98### Fixed 99- A2DP Source: fix reconfigure 100- AVRCP Controller: prevent registering of notifications for unsupported events 101- RFCOMM: fixed handling of remote port configuration command 102- HFP AG: fix accept incoming connection while audio connection is established 103- PBAP Client: handle chunked vCard Listing 104- PBAP Client: use new streaming obex_parser to handle chunked OBEX data 105- SM: Work around for unexpected Windows 10 disconnect for BR Secure Connections (SMP over BR timeout) 106- SM: support storing bonding information for devices with identical IRK but different public addresses 107- GAP: restart advertising when private address changes 108- le_device_db_tlv: keep number of devices reported by le_device_db_count if old entry is replaced 109 110### Changed 111- Drop iOS support 112- HCI: provide status instead of undocumented int error code and bool for API functions 113- HCI: use 1000 ms watchdog to force power off for hci_power_control(HCI_POWER_OFF) 114- GAP: local name, EIR data, class of device and default link policy can be updated at any time 115- L2CAP: provide status instead of undocumented int error code and bool for API functions 116- L2CAP: remote features not required for SDP connections 117- L2CAP: replaced l2cap_register_packet_handler with l2cap_add_event_handler to register multiple handlers 118- L2CAP: drop reason parameter in l2cap_disconnect 119- L2CAP: use official terminology for L2CAP channel modes - ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE replaces ENABLE_LE_DATA_CHANNELS 120- L2CAP: unify API for can send now, request to send, and send packet and disconnect channel 121- L2CAP: unify events for can send now, packet sent, channel closed (CbM/ECBM using existing events) 122- RFCOMM: `RFCOMM_EVENT_PORT_CONFIGURATION` contains rfcomm_cid and remote flag, emitted for query config 123- RFCOMM: provide status instead of undocumented int error code and bool for API functions 124- RFCOMM: remote port configuration, line status, and modem status are sent by channel state machine 125- HSP: add ACL Connection to all events and BD ADDR to HSP_SUBEVENT_RFCOMM_CONNECTION_COMPLETE 126- HFP: API functions return status code if appropriate 127- HFP: removed one parameter from hfp_ag/hf_activate_voice_recognition function, introduce hfp_ag/hf_deactivate_voice_recognition instead 128- HFP: merged legacy and enhanced Voice Recognition Activation (VRA) API. If available enhanced mode will be preferred. 129- HFP: separate events for activation (HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED) and deactivation (HFP_SUBEVENT_VOICE_RECOGNITION_DEACTIVATED) instead of combined HFP_SUBEVENT_VOICE_RECOGNITION_STATUS with status field. HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED contains field "enhanced" to indicate if enhanced mode is used. 130- HFP: enhanced VRA: HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED is emitted after VRA is ready and the the audio connection is established. This simplifies HFP HF client logic, i.e. client can call `hfp_hf_enhanced_voice_recognition_report_ready_for_audio directly` upon reception of HFP_SUBEVENT_VOICE_RECOGNITION_ACTIVATED event. 131- AVDTP: media config validator is called with preview of media codec configuration event and configured separately for sink/source 132- AVRCP: use PANEL as default unit + subunit info 133- AVRCP Controller: automatically query supported events when registering for notifications 134- AVRCP Target: cache companies and events in library and remove need to answer query in application callback. Use Bluetooth SIG as default company. 135- Run Loop: new functionality for HCI transport drivers and inter-process communication: 136 - *btstack_run_loop_poll_data_sources_from_irq*: used to transfer control from IRQ handler to main thread/run loop 137 - *btstack_run_loop_execute_on_main_thread*: schedule code execution on main thread from other thread 138 - *btstack_run_loop_trigger_exit*: trigger run loop exit 139- POSIX / Windows / Raspi / Qt: use updated ctrl-c handling 140- POSIX TLV: use max value size of 2048, assert in store function if value size is larger 141 142 143## Release v1.4.1 144 145### Added 146- GAP: emit GAP_EVENT_PAIRING_STARTED and GAP_EVENT_PAIRING_COMPLETE 147 148### Fixed 149- GAP: store link key in hci connection struct to allow authenticate after pairing without bonding 150- GAP: avoid requesting authentication twice 151- GAP: cache own address on start advertising and connecting, provide getters 152- GAP: stop LE connecting if create connection fails (e.g. connectable adv active and multiple roles not supported) 153- SM: fix race condition between local address changes and pairing procedure 154- ATT DB: fix spelling `gatt_server_get_handle_range_for_service_with_uuid128`, `gatt_server_get_handle_range_for_service_with_uuid16` 155 156### Changed 157- HCI: update advertising data without stopping advertising first 158- GAP: Drop local bonding flag in IO Capability Reply if remote does not indicate bonding 159- GAP: return status for `gap_set_security_mode` 160- GAP: abort legacy pairing if Level 4 is required 161- GAP: abort SSP on IO Capabilities Request event if Level 4 is required but SC not supported by remote 162- GAP: abort SSP on User Confirmation Request event if Level 3 is required but MITM protection not possible 163- GAP: validate minimal service security level can be reached during pairing in responder role 164- L2CAP: don't trigger hci disconnect if l2cap security requirements are insufficient 165- CVE-2020-26555: reject connections to and from devices with same BD ADDR 166- CVE-2020-26555: ignore NULL link key 167- CVE-2020-26558: abort LE Secure Connection pairing if remote uses the same public key 168 169## Release v1.4 170 171### Added 172- HCI: `btstack_transport_sco.h` supports SCO over physical PCM/I2S interface (`HAVE_SCO_TRANSPORT`) 173- POSIX: `btstack_transport_sco_i2s_test_bridge.c` implements SCO transport interface for UART-to-I2S test bridge 174- btstack_uart: `btstack_uart_t` interface extends `btstack_uart_block_t`: 175 - support sending and receiving SLIP frames for HCI H5 176 - support odd parity 177 - `hci_transport_h4` and chipset drivers have new functions to provide `btstack_uart_t` 178- btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing `btstack_uart_block` drivers. 179- hci_transport: add parity field and pass on to `btstack_uart_t` in h4 and h5 180- GATT Client: Battery Service Client 181- GATT Client: Device Information Service Client 182- GATT Client: HID-over-GATT (HOG) Client, Report and Boot Host 183- GATT Client: Scan Parameters Service Client 184- GATT Server: Scan Parameters Service Server 185- GAP: support scan page configuration with `gap_set_page_scan_activity` and `gap_set_page_scan_type` 186- GAP: support sniff subrating with `gap_sniff_subrating_configure` 187- GAP: support QoS setup with `gap_qos_set` 188- AVRCP: new field `button_pressed` in `AVRCP_SUBEVENT_OPERATION` 189- AVRCP: `AVRCP_SUBEVENT_OPERATION` emitted for button release 190- AVRCP Controller: `avrcp_controller_start_press_and_hold_cmd` supports arbitrary device buttons 191- AVRCP Controller: reassemble fragmented AVCTP packets 192- AVDTP: `avdtp_register_media_config_validator` allows to validate media codec configuration 193- A2DP Source: `ENABLE_A2DP_SOURCE_EXPLICIT_CONFIG` disables auto config. requires call to `a2dp_source_set_config_{CODEC}` 194 195### Fixed 196- GAP: calculate IO Cap AuthReq Bondable Mode based on `gap_ssp_set_authentication_requirement` and `gap_set_bondable_mode` 197- GAP: only store link key for SSP if remote side has set bondable in io cap auth requirements 198- GAP: allow to disable link supervision timeout 199- GAP: fix `gap_connect` after `gap_connect_cancel` 200- GAP: re-configure advertisements after power cycle 201- HCI: handle start inquiry failure 202- L2CAP: fix create outgoing connection triggered from packet handler on hci disconnect event 203- L2CAP: return unknown mandatory option in config response 204- AVDTP: fix spelling `avdtp_set_preferred_sampling_frequency` 205- AVRCP Target: fix notification changed event 206- HFP: Emit audio connection released on SLC Release, e.g. on remote power off 207- HFP HF: fix audio connection setup if codec negotiation is supported 208- HFP HF: only emit single event for RING and AG Status updates 209- HFP AG: fix audio connection setup for in-band ringtone on incoming connection 210 211### Changed 212- Port Archive: moved ports that are not recommended for new designs to port/archive folder: 213 - MSP430: the ports used the older community GCC version without 20-bit support needed for code size > 64kB 214 - Broadcom/Cypress H5: uploading PatchRAM is only possible in H4 mode. It's better to also use H4 in general 215 - PIC32-Harmony: the port used Harmony v1 while Harmony v3 has been out since a while 216 - iOS: not supported 217- Run Loop Base: functionality used in most platform run loop implementations 218 - code from `btstack_run_loop_base.c` moved into `btstack_run_loop.c` to minimize changes to build systems 219 - `btstack_run_loop_base.c` is a placeholder and can be removed from build 220- HCI Dump: replace monolithic `hci_dump.c` (with many #ifdefs) into dispatcher with platform-specific implementations: 221 - `posix/hci_dump_posix_fs` - writes binary log file 222 - `posix/hci_dump_stdout` - log to console using printf with local system time 223 - `embedded/hci_dump_embedded_stdout` - log to console using printf 224 - `embedded/hci_dump_segger_stdout` - log to RTT console using `SEGGER_printf` 225 - `embedded/hci_dump_segger_binary` - writes binary log over RTT to host 226- HCI: config I2S for BCM Controllers if `ENABLE_SCO_OVER_PCM`, reduce bit clock to 256/512 kHz 227- btstack_uart_posix: supports SLIP frames and replaces `btstack_uart_block_posix` 228- hci_transport_h5: more performant H5 implementation that requires `btstack_uart_t` driver with SLIP support 229- POSIX Ports: use new `btstack_uart_posix` implementation 230- posix-h5/posix-h5-bcm: use even parity for UART 231- HCI Transport: extract convenience function declaration for h4, h5, em9304_spi, and usb into separate hci_transport_{type}.h 232- GAP: provide Device ID from EIR in GAP_EVENT_INQUIRY_RESULT 233- GAP: only store link key if it allows requested security level 234- GAP: abort SSP pairing if MITM protection required but not possible 235- SM: start pairing as Central for already encrypted connection on Slave Security Request 236- GATT Client: Use ATT_READ_REQUEST for first blob of Read Long Characteristic and Read Long Characteristic Descriptor 237- GATT Server: Allow ATT Read Callback to return custom ATT Error Code 238- Nordic SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 239 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 240- u-blox SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 241 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 242- HID: Move `src/classic/hid.h` into `src` and prefix with `btstack_` to use it with BLE and avoid name clashes 243- HFP: provide acl_handle in events to identify connection 244- HSP AG: emit HSP_SUBEVENT_BUTTON_PRESSED instead of audio connection setup/release 245- Example: use `btstack_event.h` getters instead of direct array access, use enum to compare status codes 246 247 248## Release v1.3.2 249 250### Added 251- GAP: support for Classic Out-of-Band (OOB) pairing via `gap_ssp_remote_oob_data` with `ENABLE_CLASSIC_OOB_PAIRING` 252- GAP: read local OOB data on start and on call to `gap_ssp_generate_oob_data`, provided via `GAP_EVENT_LOCAL_OOB_DATA` 253- HID Host: add profile, update `hid_host_demo.c` example 254 255### Fixed 256- L2CAP: make handling of HCI disconnect more robust 257- AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect 258- AVRCP: fix issue when Controller and Target send at the same time 259 260### Changed 261- A2DP, AVDTP: use `a2dp_source_set_config_{TYPE}` and `avdtp_config{TYPE}_store` to avoid large number of parameters 262 263 264## Release v1.3 265 266### Added 267- CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 268- BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 269- SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 270- HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 271- A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 272- A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 273- A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 274- A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 275- A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 276 277### Fixed 278- HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 279- L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 280- HFP AG/HSP AG: avoid connecting to remote service with same role 281- A2DP Source: support multiple Stream Endpoints with different Media Codec types 282- A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 283- GATT Compiler: support multiple instances of the same service 284 285### Changed 286- GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 287- HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 288- AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 289- AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 290- A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 291- GATT Client: Skip MTU exchange after MTU exchange on ATT Server 292- Ports: STM32-F103RB Nucleo + CC256x port removed 293- ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 294 295 296## Release v1.2.1 297 298### Fixed 299- L2CAP: use connection handle for channel lookups 300- L2CAP: forward data only in open state 301 302### Changed 303- L2CAP: check packet size against local mtu for classic basic channels 304 305 306## Release v1.2 307 308### Fixed 309- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 310- SM: fix update of sc flag for re-encrypted connection in peripheral role 311- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 312- ESP32: fix audio sink driver 313 314### Added 315- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 316- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 317- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 318- SM: emit events for re-encryption started/complete when bonding information is available 319 320### Changed 321- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 322- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 323 324 325## Changes October 2020 326 327### Fixed 328- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 329- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 330- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 331- SM: set LinkKey flag to request CTKD if enabled 332- SM: store CTKD key with Public Identity Address 333- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 334- SM: start SMP Timeout when sending Security Request 335- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 336- HCI: fix reject of LE remote connection param request via HCI 337 338### Added 339- GAP: add `gap_get_link_key_for_bd_addr` 340- GAP: add `gap_bonded` to check if bonding information is available for active connection 341- SM: support h7 for CTKD 342 343### Changed 344- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 345- SM: block connection if encryption fails for bonded devices as Central 346- SM: support pairing as Central after failed re-encryption 347 348 349## Release v1.1 350 351### Fixed 352- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 353 354### Added 355 356### Changed 357 358 359## Changes September 2020 360 361### Fixed 362- HFP: fix parsing of ranges e.g. in +CIND responses 363- AVDTP, AVRCP: fix bugs due to transaction id overrun 364- A2DP Source: fix issues with stream configuration by sink 365- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 366 367### Added 368- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 369- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 370 371### Changed 372- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 373- HSP, HFP: allow to configure usable SCO packet types 374- cc256x: update CC256xC init script to v1.4 375- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 376 377## Changes August 2020 378 379### Fixed 380- ESP32: fix authentication for incoming Secure Connections 381- AVDTP: Fix forwarding of Delay reports 382- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 383- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 384 385### Added 386- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 387- GAP: request role change for classic connection via `gap_request_role` 388- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 389- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 390- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 391- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 392- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 393- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 394 395### Changed 396- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 397- GAP: 'gap_auto_connect_x' API deprecated. Please directly manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 398- example/hid_host_demo: try to become master for incoming connections 399- btstack_run_loop: use btstack_assert instead of local while(true) 400- att_db_util: allow to reset att_db via `att_db_util_init` 401 402## Changes July 2020 403 404### Fixed 405- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 406- AVDTP: handle concurrent signaling establishment with reject and retry 407 408### Added 409- example/hid_host_demo: support reconnect from HID device 410- Crypto: support software AES128 for AES-CCM operations 411- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 412- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 413- 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 414- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 415- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 416 417### Changed 418- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 419 420 421## Changes June 2020 422 423### Fixed 424- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 425- SM: Fix validation of confirm value for secure connection Passkey entry 426- AVRCP: handle concurrent signaling establishment with reject and retry 427 428### Added 429- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 430- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 431- Windows port for Dialog DA14585 connected via serial port 432 433## Changes 434- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 435 436## Changes May 2020 437 438### Fixed 439- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 440- pbap_client: fix PBAP UUID len on connect message 441- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 442- A2DP Source: only connect to remote sink stream endpoints 443- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 444- hsp_hs: fix disconnect if audio not connected 445- hsp_ag: fix accept incoming connection 446 447### Added 448- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 449- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 450- cc256x: allow to specify power vector for each modulation type 451- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 452- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 453- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 454 455### Changed 456- L2CAP ERTM: send extended features request only once per HCI connection 457 458 459## Changes April 2020 460 461### Fixed 462- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 463- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 464 465### Added 466- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 467- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 468- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 469 470### Changed 471- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 472- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 473- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 474 475 476## Changes March 2020 477 478### Fixed 479- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 480- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 481 482### Added 483- GATT Client: allow to register for any notification/indication and/or any connection 484- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 485- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 486- btstack_util: added btstack_replace_bd_addr_placeholder 487 488### Changed 489- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 490- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 491 492 493## Changes Februar 2020 494 495### Fixed 496- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 497- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 498 499### Changed 500- hid_host_mode: allow sniff mode 501 502### Added 503- 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 504 505 506## Changes January 2020 507 508### Fixed 509- L2CAP ERTM: avoid read-after-free on decline of incoming connection 510- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 511- att_db_util: fix realloc of att db buffer for large attributes 512- btstack_tlv_posix: only keep last value in memory, fix delete operation 513- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 514 515### Added 516- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 517- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 518- ATT Server: validate request pdu length 519 520### Changed 521- Crypto: update AES-CMAC implementation to access all message bytes sequentially 522 523 524## Changes December 2019 525 526### Fixed 527- example/pan_lwip_http_server: use Network Access Point, CoD 528- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 529 530### Added 531 532### Changed 533- Updated CC256x initscript: CC256xC v1.3 534- ESP32: add CMake project files 535 536 537## Changes November 2019 538 539### Fixed 540- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 541- L2CAP: send LE Data Channel SDUs round robin with other data 542- L2CAP ERTM: send ERTM I-frames round robin with other data 543 544### Added 545- ATT Server: return error if request to send now for Notification or Indication already registered 546- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 547- btstack_run_loop_remove: return bool true if timer/data source was removed 548- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 549- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 550- lwip: add download test files to http server demo 551 552### Changed 553- Linked List: return bool true if item was removed 554 555 556## Changes October 2019 557 558### Fixed 559 560### Added 561- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 562- provide `btstack_assert(condition)` 563- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 564 565### Changed 566- libusb and posix ports: store bonding information in TLV 567 568 569## Changes September 2019 570 571### Fixed 572- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 573- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 574- GATT Client: allow Write Without Response independent of other requests 575 576### Added 577- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 578- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 579 580### Changed 581- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 582- bluetooth.h: extract internal defintitions to respective protocol layers 583- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 584 585 586## Changes August 2019 587 588### Fixed 589- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 590- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 591- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 592- L2CAP ERTM: stop timers on disconnect 593- L2CAP ERTM: fix sending of segmented SDUs 594- L2CAP ERTM: handle unsupported Information Response 595- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 596 597### Added 598- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 599 600## Changed 601- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 602- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 603- POSIX: use monotonic clock as timebase if available 604- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 605- HCI: Read Encryption Key Size after encryption was enabled 606- Errata 11838: 607 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 608 - GAP: validate encryption key size to emit GAP Security Levels 609 610## Changes July 2019 611 612### Fixed 613- SM: Fixed regression introduced in f3582630 614- L2CAP: avoid reading l2cap signaling command len out of bounds 615- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 616 617### Changed 618- SM: Start encryption upon receiving slave securiy request if bonded 619- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 620 621--- 622 623## Changes June 2019 624 625### Changed 626- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 627- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 628- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 629 630### Fixed 631- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 632- libusb: avoid use-after-free for SCO packets on disconnect 633 634### Added 635- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 636- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 637- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 638 639--- 640 641## Changes May 2019 642 643### Changed 644- ESP32: Configure SCO over HCI after power up 645- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 646 is defined, an explicit delete field is used to indicate an invalid entry. 647 648### Fixed 649- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 650 651### Added 652- gatt_client: emit query complete event for signed write operation 653- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 654 655--- 656 657## Changes April 2019 658 659### Changed 660- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 661 662### Fixed 663- hci: pad LE Scan response with zeroes 664- SM: store local CSRK 665- ATT DB: call write callback for validated signed writes 666- ATT Server: abort signed write validation on incoming new request 667- Bluetooth SIG web scraping tools updated 668- libusb: compiles for FreeBSD 669 670### Added 671 672--- 673 674## Changes March 2019 675 676### Changed 677- use Makefile for stm32-f4discovery-cc256x port 678- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 679 680### Fixed 681- SM: Use provided authentication requirements in slave security request 682 683### Added 684- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 685- SM: Track if connection encryption is based on LE Secure Connection pairing 686- ATT DB: Validate if connection encrypted is based on SC if requested 687- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 688- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 689- ESP32: erase nvs flash is newer nvs version found 690- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 691- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 692 693## Changes February 2019 694 695### Changed 696- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 697- btstack_audio: split interface into sink and source 698 699### Fixed 700- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 701- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 702 703### Added 704- example/a2dp_sink_demo: add target role, support volume control on both devices 705- example/audio_duplex: playback audio audio source on audio sink (test audio path) 706- btstack_audio_embedded: implement audio source path 707 708--- 709 710## Changes January 2019 711 712### Changed 713- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 714- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 715 716### Added 717- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 718- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 719- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 720- ad_parser: validate data element length fields in ad_iterator_has_more 721- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 722 723### Fixed 724- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 725- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 726- Crypto: directly process queued crypto operation on HCI result 727 728--- 729 730## Changes December 2018 731 732### Added 733- SM: generate and store ER / IR keys in TLV, unless manually set by application 734- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 735 736### Fixed 737- SM: fix internal buffer overrun during random address generation 738 739## Changes November 2018 740 741### Added 742- GAP: gap_le_connection_interval provides connection interval for conn handle 743- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 744- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 745- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 746- SM: generate and store ER / IR keys in TLV, unless manually set by application 747 748### Fixed 749- SM: prevent random address updates if gap_random_address_set was used 750- SM: fix internal buffer overrun that can cause storing of bonding information to fail 751- SM: ignore Slave Security Request after sending own Pairing Request 752- L2CAP: fix use after free on disconnect if ERTM is enabled 753- HFP: Handle multiple commands/responses in single RFCOMM packet 754- Memory Pools: clear all buffers before use 755 756--- 757 758## Changes October 2018 759 760### Added 761- SDP Server: queue incoming connections when already connected instead of rejecting them 762- 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. 763- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 764 765### Fixed 766- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 767- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 768- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 769- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 770- L2CAP ERTM: fix outgoing fragment management 771- HFP: decline incoming RFCOMM connection after outgoing connection was started 772- AVRCP: fix crash on disconnect of connection established by remote 773 774--- 775 776## Changes September 2018 777 778### Fixed 779- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 780- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 781- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 782- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 783- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 784- 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 785- RFCOMM: Avoid use-after-free on channel finalize 786- GATT Client: stop timer on disconnect - fixes use after free / crash 787 788### Added 789- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 790- 3rd-party: yxml is used for PBAP vCard list parsing 791- cc256xC: new v1.1 init scripts 792 793--- 794 795## Changes August 2018 796 797### Added 798- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 799 800### Fixed 801- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 802- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 803- SM: drop LTK flag from Pairing Response for Secure Connections 804- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 805 806## Changes June 2018 807 808### Added 809- btstack_audio.h: application level API for audio playback and recording 810- embedded/hal_audio.h: low-level API for audio playback and recording 811- HID Device: hid_device_connect(..) function 812- ESP32: implement hal_audio 813- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 814- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 815 816### Changed 817- Errata 10734: 818 - SM: Generate new EC Public Keypair after each pairing 819 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 820- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 821- windows: ignore virtual Bluetooth adapter provided by VMware 822- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 823 824--- 825 826## Changes June 2018 827 828### Fixed 829- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 830- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 831- AVRCP Controller: fix parsing of now playing info 832 833### Changed 834- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 835 836### Added 837- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 838 839--- 840 841## Changes May 2018 842 843### Added 844- GAP: re-encrypt outgoing connection if bonded 845- ATT Server: wait until re-encryption is complete 846- GATT Client: wait until re-encryption is complete 847- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 848- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 849 850### Changed 851- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 852 853### Fixed 854- SM: Fix LE Secure Connection pairing in Central role 855- le_device_db_tlv: fix seq nr management 856- SM: improve le_device_db lookup and storing of IRK 857- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 858- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 859 860--- 861 862## Changes April 2018 863 864### Added 865- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 866- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 867- Embedded: support btstack_stdin via SEGGER RTT 868 869### Changed 870- att_db_util: added security requirement arguments to characteristic creators 871- SM: use btstack_crypto for cryptographpic functions 872- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 873 874### Fixed 875- HFP: fix answer call command 876- HCI: fix buffer overrun in gap_inquiry_explode 877- SDP: free service record item on sdp_unregister_service 878 879## Changes March 2018 880 881### Added 882- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 883- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 884- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 885 886### Fixed 887- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 888- HSP HS: accept incomming SCO connection 889- SM: fix iteration over LE Device DB entries for bonding and address resolving 890- SM: store pairing information only if both devices have requested bonding 891 892--- 893 894## Changes February 2018 895 896### Added 897- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 898- SM: new event SM_EVENT_PAIRING_COMPLETE 899- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 900- GAP: add gap_delete_all_link_keys 901 902### Changed 903- GATT Client: round robin for multiple connections 904- ATT Dispatch: round robin for ATT Server & GATT Client 905- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 906- btstack_link_key_db: addition functions for link key iteration 907- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 908- CSR: set all keys in psram instead of default 909 910### Fixed 911- tc3556x: fix startup after baud rate change 912 913--- 914 915## Changes January 2018 916 917### Added 918- Port for Windows with Zephyr HCI Firmware connected via serial port 919- em9304: upload patch containers during HCI bootup 920- Makefile for STM32-F4Discovery port 921- support for console out via SEGGER RTT 922- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 923- LE Streamer Client can send as fast as possbile as well 924- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 925 926### Changed 927- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 928- GAP: gap_set_connection_parameters includes scan interval and window params 929- GATT Client: GATT_EVENT_MTU indicates max MTU 930- ATT DB Util: attribute handle is returned for new Services and Characteristics 931 932### Fixed 933- Windows: retry serial port operations if not all bytes have been read/written 934- HFP: avoid buffer overflows setting up messages 935- SBC Decoder: improved error handling for invalid SBC audio data 936- GAP: fix Connection Parameter Response in Central role 937- ATT DB Util: update pointer to database in case of realloc 938- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 939- GAP: release HCI Connnection after gap_le_conne 940- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 941 942--- 943 944## Changes December 2017 945 946### Added 947- Introduced btstack_network.h network interface abstraction 948- btstack_network_posix implementation using Linux tun/tap interface 949- WICED: support for btstack_stdin (HAVE_STDIN) 950- 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. 951- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 952- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 953- LE Device DB TLV: overwrite oldest entry if no free entries available 954- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 955- Example/hid_host_demo with HID parser and support for basic US keyboard layout 956- 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 957- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 958 959### Changed 960- panu_demo: uses btstack_network.h now 961- WICED: configure printf to replace Linefeed with CRLF 962- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 963 964### Fixed 965- RFCOMM: support connection requests during connection failure 966- L2CAP: support connection requests during connection failure 967- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 968- HCI: avoid double free during halting 969- SM: fixed reconnect using legacy pairing in slave role 970 971 972