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- SM: pairing events indicate if LE Secure Connection will be used 25 26## Release v1.5.2 27 28### Added 29- GAP: ENABLE_HCI_SERIALIZED_CONTROLLER_OPERATIONS serializes Inquiry, Remote Name Request and Create Connection operations 30- GAP: support extended advertising with ENABLE_LE_EXTENDED_ADVERTISING 31- GAP: gap_enable_link_watchdog() uses automatic flush timeout to disconnect if data cannot be sent 32- GAP: gap_secure_connections_active() to query if BR/EDR Secure Connecions are possible 33- ATT DB: provide gatt_server_get_handle_range_for_service_with_uuid16 to find included service within handle range 34- GATT Service: Audio Input Control Service Server (AICS 1.0) 35- GATT Service: Microphone Control Service Server (MCS 1.0) 36- GATT Service: Volume Control Service Server (VCS 1.0) 37- GATT Service: Volume Offset Control Service Server (VOCS 1.0) 38 39### Fixed 40- POSIX: fix RTS/CTS configuration by keeping local termios copy in btstack_uart_posix 41- HCI: fix handling of HCI Connection Complete with error (regression introduced in v1.5.1) 42- GAP: disable scanning, advertising, connection before updating random address 43- GAP: fix LE Scan with whitelist 44- HFP_AG: fix tracking for call dropped during outgoing ringing 45- HFP: Free HFP Connection object on SDP error / Service not found 46- PBAP Client: emit operation complete with status OBEX_ABORTED 47 48### Changed 49- Chipset: use da145xx in folder/file/function names for Dialog Semiconductor SoCs 50- GAP: set min encryption key size during init, if supported 51- AVDTP: use BLUETOOTH_SERVICE_CLASS_AUDIO_SINK / SOURCE instead of BLUETOOTH_PROTOCOL_AVDTP in SDP queries 52- ATT Server: use uint8_t for status returns 53- libusb, POSIX and Windows ports: use '-' instead of ':' in btstack_BD_ADDR.tlv filename 54 55 56## Release v1.5.1 57 58### Added 59- GOEP Client: add goep_client_version_20_or_higher 60- ESP32: implement audio source 61 62### Fixed 63- PBAP Client: support disconnect while operation is ongoing 64- PBAP Client: use SRM only if GOEP v2.0 or higher connection 65- PBAP Client: emit vCard entry data as PBAP_DATA_PACKET 66- L2CAP: limit remote MTU by local tx configuration in ERTM 67 68### Changed 69- Example: init SM if LE supported to avoid issue with Android Cross-Transport Key-Derivation 70- ESP32: update sdkconfig for esp-idf v4.3, disable Bluedroid host stack 71- ESP32: use I2S configuration from ESP32 LyraT V4.3 72 73 74## Release v1.5.0 75 76### Added 77- HCI Dump: Support BTSnoop format in hci_dump_posix_fs.c for format = HCI_DUMP_BTSNOOP 78- HCI Dump RTT STDOUT: drop messages if RTT buffer is full and RTT is configured for non-blocking 79- HCI: hci_remove_event_handler to remove packet handler 80- hci_cmd: support variable length fields and arrayed parameters 81- GAP: ENABLE_EXPLICIT_LINK_KEY_REPLY allows for asynchronous link key lookup by application 82- GAP: gap_set_page_timeout to set Page Timeout 83- GAP: gap_inquiry_set_scan_activity to set Inquiry Scan Activity 84- L2CAP: emit L2CAP_EVENT_INFORMATION_RESPONSE event with extended features and fixed channels supported 85- L2CAP: support Enhanced Credit-based Flow-Control Mode for connection-oriented channels over BR/EDR/LE 86- A2DP: allow to register media codec validator for sink and source with: 87 - `a2dp_sink_register_media_config_validator` 88 - `a2dp_source_register_media_config_validator` 89- 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 90- OBEX: new obex_parser for chunked OBEX data 91- SM: Support Cross-Transport Key-Derivation (CTKD) of LE LTK from BR/EDR SC Link Key in Responder role 92- SM: sm_remove_event_handler to remove packet handler 93- GATT Service: Bond Management Service (BMS 1.0) Server 94- GATT Service: Microphone Control Service (MICS 1.0) Server 95- GATT Service: TX Power Service (TPS 1.0) Server 96- POSIX: btstack_signal allows to register for callback on signal, e.g. ctrl-c 97- Windows: btstack_stdin_window_register_ctrl_c_callback allows to register for ctrl-c 98 99### Fixed 100- A2DP Source: fix reconfigure 101- AVRCP Controller: prevent registering of notifications for unsupported events 102- RFCOMM: fixed handling of remote port configuration command 103- HFP AG: fix accept incoming connection while audio connection is established 104- PBAP Client: handle chunked vCard Listing 105- PBAP Client: use new streaming obex_parser to handle chunked OBEX data 106- SM: Work around for unexpected Windows 10 disconnect for BR Secure Connections (SMP over BR timeout) 107- SM: support storing bonding information for devices with identical IRK but different public addresses 108- GAP: restart advertising when private address changes 109- le_device_db_tlv: keep number of devices reported by le_device_db_count if old entry is replaced 110 111### Changed 112- Drop iOS support 113- HCI: provide status instead of undocumented int error code and bool for API functions 114- HCI: use 1000 ms watchdog to force power off for hci_power_control(HCI_POWER_OFF) 115- GAP: local name, EIR data, class of device and default link policy can be updated at any time 116- L2CAP: provide status instead of undocumented int error code and bool for API functions 117- L2CAP: remote features not required for SDP connections 118- L2CAP: replaced l2cap_register_packet_handler with l2cap_add_event_handler to register multiple handlers 119- L2CAP: drop reason parameter in l2cap_disconnect 120- L2CAP: use official terminology for L2CAP channel modes - ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE replaces ENABLE_LE_DATA_CHANNELS 121- L2CAP: unify API for can send now, request to send, and send packet and disconnect channel 122- L2CAP: unify events for can send now, packet sent, channel closed (CbM/ECBM using existing events) 123- RFCOMM: `RFCOMM_EVENT_PORT_CONFIGURATION` contains rfcomm_cid and remote flag, emitted for query config 124- RFCOMM: provide status instead of undocumented int error code and bool for API functions 125- RFCOMM: remote port configuration, line status, and modem status are sent by channel state machine 126- HSP: add ACL Connection to all events and BD ADDR to HSP_SUBEVENT_RFCOMM_CONNECTION_COMPLETE 127- HFP: API functions return status code if appropriate 128- HFP: removed one parameter from hfp_ag/hf_activate_voice_recognition function, introduce hfp_ag/hf_deactivate_voice_recognition instead 129- HFP: merged legacy and enhanced Voice Recognition Activation (VRA) API. If available enhanced mode will be preferred. 130- 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. 131- 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. 132- AVDTP: media config validator is called with preview of media codec configuration event and configured separately for sink/source 133- AVRCP: use PANEL as default unit + subunit info 134- AVRCP Controller: automatically query supported events when registering for notifications 135- AVRCP Target: cache companies and events in library and remove need to answer query in application callback. Use Bluetooth SIG as default company. 136- Run Loop: new functionality for HCI transport drivers and inter-process communication: 137 - *btstack_run_loop_poll_data_sources_from_irq*: used to transfer control from IRQ handler to main thread/run loop 138 - *btstack_run_loop_execute_on_main_thread*: schedule code execution on main thread from other thread 139 - *btstack_run_loop_trigger_exit*: trigger run loop exit 140- POSIX / Windows / Raspi / Qt: use updated ctrl-c handling 141- POSIX TLV: use max value size of 2048, assert in store function if value size is larger 142 143 144## Release v1.4.1 145 146### Added 147- GAP: emit GAP_EVENT_PAIRING_STARTED and GAP_EVENT_PAIRING_COMPLETE 148 149### Fixed 150- GAP: store link key in hci connection struct to allow authenticate after pairing without bonding 151- GAP: avoid requesting authentication twice 152- GAP: cache own address on start advertising and connecting, provide getters 153- GAP: stop LE connecting if create connection fails (e.g. connectable adv active and multiple roles not supported) 154- SM: fix race condition between local address changes and pairing procedure 155- ATT DB: fix spelling `gatt_server_get_handle_range_for_service_with_uuid128`, `gatt_server_get_handle_range_for_service_with_uuid16` 156 157### Changed 158- HCI: update advertising data without stopping advertising first 159- GAP: Drop local bonding flag in IO Capability Reply if remote does not indicate bonding 160- GAP: return status for `gap_set_security_mode` 161- GAP: abort legacy pairing if Level 4 is required 162- GAP: abort SSP on IO Capabilities Request event if Level 4 is required but SC not supported by remote 163- GAP: abort SSP on User Confirmation Request event if Level 3 is required but MITM protection not possible 164- GAP: validate minimal service security level can be reached during pairing in responder role 165- L2CAP: don't trigger hci disconnect if l2cap security requirements are insufficient 166- CVE-2020-26555: reject connections to and from devices with same BD ADDR 167- CVE-2020-26555: ignore NULL link key 168- CVE-2020-26558: abort LE Secure Connection pairing if remote uses the same public key 169 170## Release v1.4 171 172### Added 173- HCI: `btstack_transport_sco.h` supports SCO over physical PCM/I2S interface (`HAVE_SCO_TRANSPORT`) 174- POSIX: `btstack_transport_sco_i2s_test_bridge.c` implements SCO transport interface for UART-to-I2S test bridge 175- btstack_uart: `btstack_uart_t` interface extends `btstack_uart_block_t`: 176 - support sending and receiving SLIP frames for HCI H5 177 - support odd parity 178 - `hci_transport_h4` and chipset drivers have new functions to provide `btstack_uart_t` 179- btstack_uart_slip_wrapper: wrapper that implements SLIP functionality for existing `btstack_uart_block` drivers. 180- hci_transport: add parity field and pass on to `btstack_uart_t` in h4 and h5 181- GATT Client: Battery Service Client 182- GATT Client: Device Information Service Client 183- GATT Client: HID-over-GATT (HOG) Client, Report and Boot Host 184- GATT Client: Scan Parameters Service Client 185- GATT Server: Scan Parameters Service Server 186- GAP: support scan page configuration with `gap_set_page_scan_activity` and `gap_set_page_scan_type` 187- GAP: support sniff subrating with `gap_sniff_subrating_configure` 188- GAP: support QoS setup with `gap_qos_set` 189- AVRCP: new field `button_pressed` in `AVRCP_SUBEVENT_OPERATION` 190- AVRCP: `AVRCP_SUBEVENT_OPERATION` emitted for button release 191- AVRCP Controller: `avrcp_controller_start_press_and_hold_cmd` supports arbitrary device buttons 192- AVRCP Controller: reassemble fragmented AVCTP packets 193- AVDTP: `avdtp_register_media_config_validator` allows to validate media codec configuration 194- A2DP Source: `ENABLE_A2DP_SOURCE_EXPLICIT_CONFIG` disables auto config. requires call to `a2dp_source_set_config_{CODEC}` 195 196### Fixed 197- GAP: calculate IO Cap AuthReq Bondable Mode based on `gap_ssp_set_authentication_requirement` and `gap_set_bondable_mode` 198- GAP: only store link key for SSP if remote side has set bondable in io cap auth requirements 199- GAP: allow to disable link supervision timeout 200- GAP: fix `gap_connect` after `gap_connect_cancel` 201- GAP: re-configure advertisements after power cycle 202- HCI: handle start inquiry failure 203- L2CAP: fix create outgoing connection triggered from packet handler on hci disconnect event 204- L2CAP: return unknown mandatory option in config response 205- AVDTP: fix spelling `avdtp_set_preferred_sampling_frequency` 206- AVRCP Target: fix notification changed event 207- HFP: Emit audio connection released on SLC Release, e.g. on remote power off 208- HFP HF: fix audio connection setup if codec negotiation is supported 209- HFP HF: only emit single event for RING and AG Status updates 210- HFP AG: fix audio connection setup for in-band ringtone on incoming connection 211 212### Changed 213- Port Archive: moved ports that are not recommended for new designs to port/archive folder: 214 - MSP430: the ports used the older community GCC version without 20-bit support needed for code size > 64kB 215 - Broadcom/Cypress H5: uploading PatchRAM is only possible in H4 mode. It's better to also use H4 in general 216 - PIC32-Harmony: the port used Harmony v1 while Harmony v3 has been out since a while 217 - iOS: not supported 218- Run Loop Base: functionality used in most platform run loop implementations 219 - code from `btstack_run_loop_base.c` moved into `btstack_run_loop.c` to minimize changes to build systems 220 - `btstack_run_loop_base.c` is a placeholder and can be removed from build 221- HCI Dump: replace monolithic `hci_dump.c` (with many #ifdefs) into dispatcher with platform-specific implementations: 222 - `posix/hci_dump_posix_fs` - writes binary log file 223 - `posix/hci_dump_stdout` - log to console using printf with local system time 224 - `embedded/hci_dump_embedded_stdout` - log to console using printf 225 - `embedded/hci_dump_segger_stdout` - log to RTT console using `SEGGER_printf` 226 - `embedded/hci_dump_segger_binary` - writes binary log over RTT to host 227- HCI: config I2S for BCM Controllers if `ENABLE_SCO_OVER_PCM`, reduce bit clock to 256/512 kHz 228- btstack_uart_posix: supports SLIP frames and replaces `btstack_uart_block_posix` 229- hci_transport_h5: more performant H5 implementation that requires `btstack_uart_t` driver with SLIP support 230- POSIX Ports: use new `btstack_uart_posix` implementation 231- posix-h5/posix-h5-bcm: use even parity for UART 232- HCI Transport: extract convenience function declaration for h4, h5, em9304_spi, and usb into separate hci_transport_{type}.h 233- GAP: provide Device ID from EIR in GAP_EVENT_INQUIRY_RESULT 234- GAP: only store link key if it allows requested security level 235- GAP: abort SSP pairing if MITM protection required but not possible 236- SM: start pairing as Central for already encrypted connection on Slave Security Request 237- GATT Client: Use ATT_READ_REQUEST for first blob of Read Long Characteristic and Read Long Characteristic Descriptor 238- GATT Server: Allow ATT Read Callback to return custom ATT Error Code 239- Nordic SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 240 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 241- u-blox SPP Service Server: use `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` and `GATTSERVICE_SUBEVENT_SPP_SERVICE_CONNECTED` 242 events instead of callback, and `RFCOMM_DATA_PACKET` for received data 243- HID: Move `src/classic/hid.h` into `src` and prefix with `btstack_` to use it with BLE and avoid name clashes 244- HFP: provide acl_handle in events to identify connection 245- HSP AG: emit HSP_SUBEVENT_BUTTON_PRESSED instead of audio connection setup/release 246- Example: use `btstack_event.h` getters instead of direct array access, use enum to compare status codes 247 248 249## Release v1.3.2 250 251### Added 252- GAP: support for Classic Out-of-Band (OOB) pairing via `gap_ssp_remote_oob_data` with `ENABLE_CLASSIC_OOB_PAIRING` 253- GAP: read local OOB data on start and on call to `gap_ssp_generate_oob_data`, provided via `GAP_EVENT_LOCAL_OOB_DATA` 254- HID Host: add profile, update `hid_host_demo.c` example 255 256### Fixed 257- L2CAP: make handling of HCI disconnect more robust 258- AVDTP: emit stream release for active stream if signaling connection is closed first, e.g. caused by HCI disconnect 259- AVRCP: fix issue when Controller and Target send at the same time 260 261### Changed 262- A2DP, AVDTP: use `a2dp_source_set_config_{TYPE}` and `avdtp_config{TYPE}_store` to avoid large number of parameters 263 264 265## Release v1.3 266 267### Added 268- CC256x: with ENABLE_CC256X_ASSISTED_HFP, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 269- BCM: with ENABLE_BCM_PCM_WBS, HFP enables WBS codec on demand and configures PCM/I2S interface for 8kH/16kHz 270- SDP Client RFCOMM: add `sdp_client_query_rfcomm_channel_and_name_for_service_class_uuid` 271- HFP: `ENABLE_HFP_AT_MESSAGES` lets HFP emit `HFP_SUBEVENT_AT_MESSAGE_SENT` and `HFP_SUBEVENT_AT_MESSAGE_RECEIVED` 272- A2DP, AVDTP: provide capabilities and configuration events for A2DP codecs: SBC, MPEG Audio, MPEG AAC, ATRAC 273- A2DP + AVDTP Source: allow to send media packet with `avdtp_source_stream_send_media_packet` and `a2dp_source_stream_send_media_packet` 274- A2DP + AVDTP Source: add `avdtp_source_stream_send_media_payload_rtp` and `a2dp_source_stream_send_media_payload_rtp` 275- A2DP Source: emit `A2DP_SUBEVENT_SIGNALING_CAPABILITIES_COMPLETE` 276- A2DP Source: allow to configure endpoints by calling `a2dp_source_set_config_{TYPE}` during SEP discovery with SBC fallback 277 278### Fixed 279- HCI: keep `le connecting request` on connection complete active, fixes gap_auto_connection_stop() + gap_auto_connection_start() 280- L2CAP: fix packet size check for incoming classic basic channels (regression introduced in v1.2.1) 281- HFP AG/HSP AG: avoid connecting to remote service with same role 282- A2DP Source: support multiple Stream Endpoints with different Media Codec types 283- A2DP Source: emit codec configure event with reconfigure flag set on reconfigure 284- GATT Compiler: support multiple instances of the same service 285 286### Changed 287- GAP: provide Link Type parameter to incoming connection filter for `gap_register_classic_connection_filter` 288- HFP/GOEP Client/AVDTP/A2DP: return `SDP_SERVICE_NOT_FOUND` if no suitable SDP record is found 289- AVDTP Source: `avdtp_source_stream_send_media_payload` includes SBC Header and was deprecated 290- AVDTP/A2DP: use `avdtp_channel_mode_t` in `A2DP_SUBEVENT_SIGNALING_MEDIA_CODEC_SBC_CONFIGURATION` 291- A2DP: fix events and use `a2dp_cid`, `local_seid,` `remote_seid` field names in A2DP sub-events 292- GATT Client: Skip MTU exchange after MTU exchange on ATT Server 293- Ports: STM32-F103RB Nucleo + CC256x port removed 294- ESP32: enabled HFP Wide-Band Speech, disable classic secure connections in HSP/HFP demos 295 296 297## Release v1.2.1 298 299### Fixed 300- L2CAP: use connection handle for channel lookups 301- L2CAP: forward data only in open state 302 303### Changed 304- L2CAP: check packet size against local mtu for classic basic channels 305 306 307## Release v1.2 308 309### Fixed 310- L2CAP: trigger pairing for outgoing LE Data Channels if security level insufficient 311- SM: fix update of sc flag for re-encrypted connection in peripheral role 312- SM: send security request on re-connect if bonded and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is defined 313- ESP32: fix audio sink driver 314 315### Added 316- GAP: `gap_delete_bonding` removes device from LE Resolving List and from discards LE bonding information 317- GATT Client: delete bonding information if re-encryption fails and `ENABLE_LE_PROACTIVE_AUTHENTICATION` is not defined 318- GATT Client: gatt_client_set_required_security_level() allows to set required minimum security level for all GATT requests 319- SM: emit events for re-encryption started/complete when bonding information is available 320 321### Changed 322- AVRCP Controller: allow to send multiple absolute volume commands without waiting for response. 323- GAP: replaced `ENABLE_LE_CENTRAL_AUTO_ENCRYPION` with `ENABLE_LE_PROACTIVE_AUTHENTICATION` 324 325 326## Changes October 2020 327 328### Fixed 329- AVDTP Initiator: avoid use of remote seid for stream endpoint lookup, fixes issue with two connected devices 330- AVDTP Source: buffer for SBC media codec information got discarded, leading to invalid Set Configuration command in second connection 331- SM: only trigger Cross-Transport Key Derivation (CTKD) when bonding is enabled 332- SM: set LinkKey flag to request CTKD if enabled 333- SM: store CTKD key with Public Identity Address 334- SM: only allow CTKD to overwrite existing link key if derived key has same or higher authentication 335- SM: start SMP Timeout when sending Security Request 336- HFP HF: fix response to AG Codec Selection while waiting for OK of parallel command 337- HCI: fix reject of LE remote connection param request via HCI 338 339### Added 340- GAP: add `gap_get_link_key_for_bd_addr` 341- GAP: add `gap_bonded` to check if bonding information is available for active connection 342- SM: support h7 for CTKD 343 344### Changed 345- SM: Cross-Transport Key Derivation requires `ENABLE_CROSS_TRANSPORT_KEY_DERIVATION` now 346- SM: block connection if encryption fails for bonded devices as Central 347- SM: support pairing as Central after failed re-encryption 348 349 350## Release v1.1 351 352### Fixed 353- AVRCP/AVCTP: report AVRCP 1.6 and AVCTP 1.4 in SDP record 354 355### Added 356 357### Changed 358 359 360## Changes September 2020 361 362### Fixed 363- HFP: fix parsing of ranges e.g. in +CIND responses 364- AVDTP, AVRCP: fix bugs due to transaction id overrun 365- A2DP Source: fix issues with stream configuration by sink 366- hci_dump: fix tv_us calculation for non-posix / embedded systems with binary output 367 368### Added 369- `btstack_ring_buffer`: add `btstack_ring_buffer_reset` to reset it to initial state/empty 370- GAP: Support for address resolution of resolvable private addresses by Controller with `ENABLE_LE_PRIVACY_ADDRESS_RESOLUTION` 371 372### Changed 373- AVDTP, AVRCP, HSP: schedule SDP query, avoids avoids 'command disallowed' if SDP client is busy 374- HSP, HFP: allow to configure usable SCO packet types 375- cc256x: update CC256xC init script to v1.4 376- A2DP Source: use Get All Capabilities if supported by remote get Delay Reporting capability 377 378## Changes August 2020 379 380### Fixed 381- ESP32: fix authentication for incoming Secure Connections 382- AVDTP: Fix forwarding of Delay reports 383- STM32-F4Discovery: fix pan_lwip_http_server by increasing HCI_ACL_PAYLOAD_SIZE 384- tool/create_packet_log: basic support for 16-bit Unicode log files from Windows 385 386### Added 387- `btstack_run_loop_base`: added `btstack_run_loop_base_dump_timer` 388- GAP: request role change for classic connection via `gap_request_role` 389- GAP: LE Whitelist API with `gap_le_whitelist_x` with x = add, remove, clear and new `gap_connect_with_whitelist` 390- SDP Client: add sdp_client_register_query_callback() allows to register query request instead of polling sdp_client_ready() 391- BNEP lwIP: add `bnep_lwip_connect` to establish BNEP connection and manage lwIP network interface 392- New `btstack_linked_queue` utility, a linked list-based queue with first-in-first-out semantics and constant time enqueue/dequeue operations 393- btstack_tlv_posix: add `btstack_tlv_posix_deinit` 394- New `btpclient` for use with [auto-pts project](https://github.com/intel/auto-pts) 395 396### Changed 397- GAP: treat AES-CCM encrypted connection as mutually authenticated (BIAS) 398- GAP: 'gap_auto_connect_x' API deprecated. Please directly manage LE Whitelist with `gap_le_whitelist_*` functions and call `gap_connect_with_whitelist` instead 399- example/hid_host_demo: try to become master for incoming connections 400- btstack_run_loop: use btstack_assert instead of local while(true) 401- att_db_util: allow to reset att_db via `att_db_util_init` 402 403## Changes July 2020 404 405### Fixed 406- AVDTP: fix invalid response for Get Capabilities request if Delay Reporting was supported 407- AVDTP: handle concurrent signaling establishment with reject and retry 408 409### Added 410- example/hid_host_demo: support reconnect from HID device 411- Crypto: support software AES128 for AES-CCM operations 412- AVRCP: introduced AVRCP_FEATURE_MASK_* as alternative to avrcp_controller_supported_feature_t and avrcp_target_supported_feature_t enums 413- btstack_audio: add set_volume() to sink and set_gain() to source interfaces, minimal volume control for portaudio playback 414- 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 415- GAP: Provide gap_get_role to query master/slave role for HCI connection handle 416- GAP: Provide gap_pin_code_response_binary to use binary data as PIN, e.g. for pairing with Nintendo Wii Remote 417 418### Changed 419- GAP: set minimum required encryption key size for Classic connections back from 16 to 7, matching the Core spec 420 421 422## Changes June 2020 423 424### Fixed 425- HFP: Fix parsing of empty fields, e.g. phone number in +CLCC and other AT commands 426- SM: Fix validation of confirm value for secure connection Passkey entry 427- AVRCP: handle concurrent signaling establishment with reject and retry 428 429### Added 430- GAP: Detect Secure Connection -> Legacy Connection Downgrade Attack by remote features and actual encryption type (BIAS) 431- GAP: Mutual authentication: request authentication after Classic connection got encrypted (BIAS) 432- Windows port for Dialog DA14585 connected via serial port 433 434## Changes 435- CVSD PLC: treat zero frames as good and allow to mark data as bad, e.g. if reported by Controller as erroneous 436 437## Changes May 2020 438 439### Fixed 440- hfp_hf, hsp_hs: use eSCO params in accept sco connection only for incoming eSCO connections 441- pbap_client: fix PBAP UUID len on connect message 442- SM: fix secure connection pairing as peripheral when local user confirmation happens after remote one 443- A2DP Source: only connect to remote sink stream endpoints 444- btstack_hal_flash_memory: fix write of 0xff bytes to simulated flash 445- hsp_hs: fix disconnect if audio not connected 446- hsp_ag: fix accept incoming connection 447 448### Added 449- example/le_mitm: MITM implementation that forwards ATT PDUs and allows for pairing 450- GAP: gap_set_security_level sets required security level for incoming and outgoing connections 451- cc256x: allow to specify power vector for each modulation type 452- FreeRTOS: btstack_run_loop_freertos_trigger_exit allows to request run loop exit 453- SM: support LE Secure Connections Only mode with sm_set_secure_connections_only_mode 454- GAP: enable BR/EDR Secure Connections if supported, add gap_secure_connections_enable 455 456### Changed 457- L2CAP ERTM: send extended features request only once per HCI connection 458 459 460## Changes April 2020 461 462### Fixed 463- hog_mouse_demo/hog_keyboard_demo: handle set protocol mode = boot protocol mode 464- HCI: only update BD_ADDR placeholder in shortened and complete name in EIR data, limit device name to 240/248 bytes 465 466### Added 467- GAP: gap_set_allow_role_switch allows to prevent role switch in outgoing classic ACL connections 468- example: hog_boot_host_demo implements an HID-over-GATT Boot Host that supports keyboard and mouse 469- HCI: add ENABLE_LE_LIMIT_ACL_FRAGMENT_BY_MAX_OCTETS that forces fragmentation of ACL-LE packets to fit into over-the-air packet 470 471### Changed 472- Broadcom/Cypress: wait 300 ms after PatchRAM update in hci.c to assert Controller is ready 473- esp32: provide esp-idf/component/btstack/btstack_port_esp32.c and only minimal app_main in template/main/main.c 474- att_db: skip att_read_callback for ATT Read Blob Request if offset == value_len 475 476 477## Changes March 2020 478 479### Fixed 480- GAP: fixed gap_set_scan_parameters() if issued right before gap_start_scan() 481- HCI: only send HCI Read Local Encryption Key Size if supported by Controller 482 483### Added 484- GATT Client: allow to register for any notification/indication and/or any connection 485- HCI: added hci_read_inquiry_scan_activity and hci_write_inquiry_scan_activity commands 486- chipset: assert hci packet buffers are suitable for firmware upload or patches (atwilc3000,bcm,cc256x,intel) 487- btstack_util: added btstack_replace_bd_addr_placeholder 488 489### Changed 490- AVRCP Target: volume in avrcp_target_volume_changed is reported as current value in interim response to register for volume change notifications 491- SDP Client: query attributes 0x0000..0xffff instead of 0x0001..0xffff to match other stacks / improve compatibility with bad sdp server implementations 492 493 494## Changes Februar 2020 495 496### Fixed 497- AVRCP Target: fix reporting of PLAYBACK_STATUS_CHANGED 498- HCI: handle reconnect request for Classic and LE connections triggered by packet handler for Disconnection Complete Event 499 500### Changed 501- hid_host_mode: allow sniff mode 502 503### Added 504- 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 505 506 507## Changes January 2020 508 509### Fixed 510- L2CAP ERTM: avoid read-after-free on decline of incoming connection 511- GATT Client: set uuid16 to zero when deserializing uuid128 services, characteristics, and descriptors 512- att_db_util: fix realloc of att db buffer for large attributes 513- btstack_tlv_posix: only keep last value in memory, fix delete operation 514- l2cap_signaling: use packet boundary flags 0x00 for LE signaling packets (ignoring hci_non_flushable_packet_boundary_flag_supported()) 515 516### Added 517- att_db_util: provide GATT Database Hash via att_db_util_hash_calc 518- GATT Compiler: provide GATT Database Hash via GATT_DATABASE_HASH Characteristic 519- ATT Server: validate request pdu length 520 521### Changed 522- Crypto: update AES-CMAC implementation to access all message bytes sequentially 523 524 525## Changes December 2019 526 527### Fixed 528- example/pan_lwip_http_server: use Network Access Point, CoD 529- sm: emit pairing complete in master role when no keys are distributed / bonding disabled 530 531### Added 532 533### Changed 534- Updated CC256x initscript: CC256xC v1.3 535- ESP32: add CMake project files 536 537 538## Changes November 2019 539 540### Fixed 541- AVDTP Source: return correct `avdtp_cid` and `local_seid` in `AVDTP_SUBEVENT_STREAMING_CAN_SEND_MEDIA_PACKET_NOW` 542- L2CAP: send LE Data Channel SDUs round robin with other data 543- L2CAP ERTM: send ERTM I-frames round robin with other data 544 545### Added 546- ATT Server: return error if request to send now for Notification or Indication already registered 547- Linked List: return if item was added for `btstack_linked_list_add[_tail]` 548- btstack_run_loop_remove: return bool true if timer/data source was removed 549- segger-rtt: allow to configure with `SEGGER_RTT_PACKETLOG_*` directives, update to v6.54 550- GAP: support setting Link Supervision Timetout for outgoing Classic connections using `gap_set_link_supervision_timeout` 551- lwip: add download test files to http server demo 552 553### Changed 554- Linked List: return bool true if item was removed 555 556 557## Changes October 2019 558 559### Fixed 560 561### Added 562- `btstack_bool.h`: provide boolean type 'bool' via `<stdbool.h>` or as backport 563- provide `btstack_assert(condition)` 564- H4 Transport: avoid calling `hci_transport_h4_trigger_next_read` when transport is closed 565 566### Changed 567- libusb and posix ports: store bonding information in TLV 568 569 570## Changes September 2019 571 572### Fixed 573- L2CAP ERTM: assert that packet can be stored in fragment buffers in ertm 574- L2CAP ERTM: reject incoming connection if ERTM is configured as mandatory but not supported by remote 575- GATT Client: allow Write Without Response independent of other requests 576 577### Added 578- GAP: allow to reject GAP classic connection via gap_register_classic_connection_filter 579- GAP: support reading RSSI for Classic+LE using gap_read_rssi. Emits `GAP_EVENT_RSSI_MEASUREMENT` 580 581### Changed 582- Bluetooth and BTstack Error Codes and Events: collect status codes in bluetooth.h and events in btstack_defines.h 583- bluetooth.h: extract internal defintitions to respective protocol layers 584- Updated CC256x initscripts (CC256xB v1.8, CC256xC v1.2, CC256xC v1.2) 585 586 587## Changes August 2019 588 589### Fixed 590- POSIX, WICED, Windows, FreeRTOS run loops: handle time_ms overrun after 49 days 591- RFCOMM: accept incoming L2CAP connection in Basic mode if ERTM is enabled but not requested for this connection 592- RFCOMM: limit RFCOMM MTU by local L2CAP MTU for outgoing connections (only revelvant for ERTM) 593- L2CAP ERTM: stop timers on disconnect 594- L2CAP ERTM: fix sending of segmented SDUs 595- L2CAP ERTM: handle unsupported Information Response 596- SM: generate local nonce for confirm value in JW+NC+PK in Secure Connections Responder role 597 598### Added 599- `btstack_run_loop_base`: portable implementation of timer and data source management as base for platform specific implementations 600 601## Changed 602- FreeRTOS: use xQueueCreateStatic (static variant of xQueueCreate) if available for static memory-only setups 603- L2CAP ERTM: handle invalid Information Response (assume no extended features supported) 604- POSIX: use monotonic clock as timebase if available 605- HCI Transport H4/H5/EM9304 SPI: ignore block read/sent from UART driver when closed 606- HCI: Read Encryption Key Size after encryption was enabled 607- Errata 11838: 608 - GAP: gap_set_required_encryption_key_size allows to set the required key size, default = 16 (max) 609 - GAP: validate encryption key size to emit GAP Security Levels 610 611## Changes July 2019 612 613### Fixed 614- SM: Fixed regression introduced in f3582630 615- L2CAP: avoid reading l2cap signaling command len out of bounds 616- HCI Transport H4/H5/EM9304 SPI: fix payload size checks (also for 8/16-bit platforms) 617 618### Changed 619- SM: Start encryption upon receiving slave securiy request if bonded 620- hci: use 2 as HCI_INCOMING_PRE_BUFFER_SIZE in LE-only configuration for GATT Client 621 622--- 623 624## Changes June 2019 625 626### Changed 627- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined 628- BNEP: add Connection Handle to BNEP_EVENT_CHANNEL_OPENED 629- Examples: renamed le_counter to gatt_counter and le_streamer to le_streamer_server to indicate suppport for GATT over BR/EDR 630 631### Fixed 632- BNEP: Bluetooth address is stored in little-endian format for all BNEP_EVENT_* 633- libusb: avoid use-after-free for SCO packets on disconnect 634 635### Added 636- example: pan_lwip_http_server using lwIP as network stack to implement PAN NAP service 637- platform/lwip/bnep_lwip.c: BNEP lwIP adapter that forwards packets between BNEP service and lwIP 638- ENABLE_GATT_OVER_CLASSIC enables support for GATT over BR/EDR in att_server 639 640--- 641 642## Changes May 2019 643 644### Changed 645- ESP32: Configure SCO over HCI after power up 646- btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD 647 is defined, an explicit delete field is used to indicate an invalid entry. 648 649### Fixed 650- SM: Avoid potential use-after-free on immediate disconnect (lookup connection via con handle instead of storing pointer) 651 652### Added 653- gatt_client: emit query complete event for signed write operation 654- hci_transport_h4: add workaround for flow control bug in CYW2070x, enable with ENABLE_CYPRESS_BAUDRATE_CHANGE_FLOWCONTROL_BUG_WORKAROUND 655 656--- 657 658## Changes April 2019 659 660### Changed 661- ESP32: use micro-ecc from 3rd-party as esp-idf removed it in their 3.3 release 662 663### Fixed 664- hci: pad LE Scan response with zeroes 665- SM: store local CSRK 666- ATT DB: call write callback for validated signed writes 667- ATT Server: abort signed write validation on incoming new request 668- Bluetooth SIG web scraping tools updated 669- libusb: compiles for FreeBSD 670 671### Added 672 673--- 674 675## Changes March 2019 676 677### Changed 678- use Makefile for stm32-f4discovery-cc256x port 679- le_device_db: add secure_connection argument to le_device_db_encryption_set and le_device_db_encryption_get 680 681### Fixed 682- SM: Use provided authentication requirements in slave security request 683 684### Added 685- port/stm32-f4discovery-cc256x: add support for built-in MEMS microphone 686- SM: Track if connection encryption is based on LE Secure Connection pairing 687- ATT DB: Validate if connection encrypted is based on SC if requested 688- att_db_util: support ATT_SECURITY_AUTHENTICATED_SC permission flag 689- GATT Compiler: support READ_AUTHENTICATED and WRITE_AUTHENTICATED permsission flags 690- ESP32: erase nvs flash is newer nvs version found 691- libusb: add support for nRF52840-PCA10056 running Zephyr hci_usb example 692- port/stm32-l073rz-nucleo-em9304 for Nucleo L073RZ with EM9304 DVK, replaces port/stm32-l053r8-nucleo-em9304 693 694## Changes February 2019 695 696### Changed 697- example/a2dp_sink_demo: use linear resampling to fix sample rate drift 698- btstack_audio: split interface into sink and source 699 700### Fixed 701- Crypto: fix lockup when stack is shutdown while waiting for result of HCI Command, e.g. LE Read Local P256 Public Key 702- SM: Avoid SM_EVENT_PAIRING_COMPLETE with ERROR_CODE_REMOTE_USER_TERMINATED_CONNECTION after successful pairing in responder role 703 704### Added 705- example/a2dp_sink_demo: add target role, support volume control on both devices 706- example/audio_duplex: playback audio audio source on audio sink (test audio path) 707- btstack_audio_embedded: implement audio source path 708 709--- 710 711## Changes January 2019 712 713### Changed 714- L2CAP: provide channel mode (basic/ertm) and fcs option in L2CAP_EVENT_CHANNEL_OPENED 715- RFCOMM: support L2CAP ERTM. Callbacks passed to rfcomm_enable_l2cap_ertm() are used to manage ERTM buffers 716 717### Added 718- L2CAP: emit L2CAP_EVENT_ERTM_BUFFER_RELEASED if ERTM buffer not needed/used anymore 719- L2CAP: add fcs_option to ERTM config l2cap_ertm_config_t 720- HCI: validate advertisement data length field when generating GAP_EVENT_ADVERTISING_REPORT 721- ad_parser: validate data element length fields in ad_iterator_has_more 722- Raspberry Pi 3 A+/B+ port in port/raspi, starts without power cycle 723 724### Fixed 725- HCI: release outgoing buffer on disconnect if waiting to send another ACL fragment 726- POSIX: use correct baudrate enums for baud rates higher than 921600 (Linux) 727- Crypto: directly process queued crypto operation on HCI result 728 729--- 730 731## Changes December 2018 732 733### Added 734- SM: generate and store ER / IR keys in TLV, unless manually set by application 735- hci_dump: support PacketLogger or BlueZ format output via SEGGER RTT Channel 1 Up 736 737### Fixed 738- SM: fix internal buffer overrun during random address generation 739 740## Changes November 2018 741 742### Added 743- GAP: gap_le_connection_interval provides connection interval for conn handle 744- Nordic SPP Service Server: GATT service that emulates a serial port over BLE based on Nordic Semiconductor documentation. 745- uBlox SPP Service Server: GATT service that emulates a serial port over BLE based on uBlox documentation. 746- SM: ENABLE_LE_CENTRAL_AUTO_ENCRYPTION triggers automatic encryption on connect to bonded devices 747- SM: generate and store ER / IR keys in TLV, unless manually set by application 748 749### Fixed 750- SM: prevent random address updates if gap_random_address_set was used 751- SM: fix internal buffer overrun that can cause storing of bonding information to fail 752- SM: ignore Slave Security Request after sending own Pairing Request 753- L2CAP: fix use after free on disconnect if ERTM is enabled 754- HFP: Handle multiple commands/responses in single RFCOMM packet 755- Memory Pools: clear all buffers before use 756 757--- 758 759## Changes October 2018 760 761### Added 762- SDP Server: queue incoming connections when already connected instead of rejecting them 763- 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. 764- HIDS Device: GATT service that exposes HID reports intended for HID Devices, like keyboard and mouse. 765 766### Fixed 767- HCI: fix bug in gap_inquiry_stop that triggered additional GAP_EVENT_INQUIRY_COMPLETE instead of stopping the inquiry 768- L2CAP: fix issue with outgoing connection before read remote supported complete when other channels exist 769- L2CAP ERTM: allow SDU of szie MPS in first packet that contains L2CAP SDU Length 770- L2CAP ERTM: fix memory corruption triggered if local_mtu > mps 771- L2CAP ERTM: fix outgoing fragment management 772- HFP: decline incoming RFCOMM connection after outgoing connection was started 773- AVRCP: fix crash on disconnect of connection established by remote 774 775--- 776 777## Changes September 2018 778 779### Fixed 780- HCI: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 781- L2CAP: Error creating outgoing connection (e.g. Connection Limit Exceeded) now handled 782- L2CAP: Evaluate 'can send now' on HCI Disconnect as ACL buffers in Bluetooth Controller have been used for the closed connection are freed implicitly 783- L2CAP: Check can send now before sending extended information requeste needed for ERTM mode 784- L2CAP: Use valid signaling identifier for L2CAP Connection Parameter Update Request 785- 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 786- RFCOMM: Avoid use-after-free on channel finalize 787- GATT Client: stop timer on disconnect - fixes use after free / crash 788 789### Added 790- A2DP Source: Support stream reconfiguration (a2dp_source_reconfigure_stream_sampling_frequency) 791- 3rd-party: yxml is used for PBAP vCard list parsing 792- cc256xC: new v1.1 init scripts 793 794--- 795 796## Changes August 2018 797 798### Added 799- PBAP: added pbap_get_phonebook_size() to get phonebook entry count 800 801### Fixed 802- GATT Server: Allow enable Notifications/Indication with Write Command. Fixes issue with some Android devices. 803- SM: fix pairing for Secure Connections with Bonding if remote sends additional keys 804- SM: drop LTK flag from Pairing Response for Secure Connections 805- L2CAP: fix emitted L2CAP_EVENT_CONNECTION_PARAMETER_UPDATE_REQUEST 806 807## Changes June 2018 808 809### Added 810- btstack_audio.h: application level API for audio playback and recording 811- embedded/hal_audio.h: low-level API for audio playback and recording 812- HID Device: hid_device_connect(..) function 813- ESP32: implement hal_audio 814- DA14585: support for Dialog Semiconductor DA14585 LE-only controller 815- Raspberry Pi 3 + Raspberry Pi Zero W port in port/raspi 816 817### Changed 818- Errata 10734: 819 - SM: Generate new EC Public Keypair after each pairing 820 - SM: Abort failure with DHKEY_CHECK_FAILED if received public key is invalid (instead of unspecified error) 821- btstack.h: only include classic headers if ENABLE_CLASSIC is defined 822- windows: ignore virtual Bluetooth adapter provided by VMware 823- Replaced HCI_PACKET_BUFFER_SIZE with HCI_INCOMING_PACKET_BUFFER_SIZE and HCI_OUTGOING_PACKET_BUFFER_SIZE 824 825--- 826 827## Changes June 2018 828 829### Fixed 830- HFP: Fix Wide Band Speech bit in SDP record for both HF/AG. Missing bit prevents macOS from using mSBC 831- ATT Server: send ATT_EVENT_HANDLE_VALUE_INDICATION_COMPLETE with status ATT_HANDLE_VALUE_INDICATION_DISCONNECT on disconnect 832- AVRCP Controller: fix parsing of now playing info 833 834### Changed 835- ATT Server: ATT_HANDLE_VALUE_INDICATION_DISCONNECT is delivered to service handler if registered 836 837### Added 838- ATT Server: packet handler field added to att_service_handler_t to receive: connect/disconnect, atu exchange, indication complete 839 840--- 841 842## Changes May 2018 843 844### Added 845- GAP: re-encrypt outgoing connection if bonded 846- ATT Server: wait until re-encryption is complete 847- GATT Client: wait until re-encryption is complete 848- ATT Server: added att_server_request_to_send_notification and att_server_request_to_send_indication 849- GATT Client: if ENABLE_GATT_CLIENT_PAIRING, GATT Client starts pairing and retry operation on security error 850 851### Changed 852- ATT Server: att_server_register_can_send_now_callback is deprecated, use att_server_request_to_send_notification/indication instead 853 854### Fixed 855- SM: Fix LE Secure Connection pairing in Central role 856- le_device_db_tlv: fix seq nr management 857- SM: improve le_device_db lookup and storing of IRK 858- GATT Server: fix lookup for Client Characteristic Configuration in services with multiple Characteristics 859- RFCOMM: emit channel closed on HCI/L2CAP disconnect after sending DISC while expecting UA 860 861--- 862 863## Changes April 2018 864 865### Added 866- Crypto: btstack_crypo.h provides cryptographic functions for random data generation, AES128, EEC, CBC-MAC (Mesh) 867- SM: support pairing using Out-of-Band (OOB) data with LE Secure Connections 868- Embedded: support btstack_stdin via SEGGER RTT 869 870### Changed 871- att_db_util: added security requirement arguments to characteristic creators 872- SM: use btstack_crypto for cryptographpic functions 873- GAP: security level for Classic protocols (asides SDP) raised to 2 (encryption) 874 875### Fixed 876- HFP: fix answer call command 877- HCI: fix buffer overrun in gap_inquiry_explode 878- SDP: free service record item on sdp_unregister_service 879 880## Changes March 2018 881 882### Added 883- GAP: allow to limit number of connections in LE Peripheral role with gap_set_max_number_peripheral_connections 884- ATT Server: support for delayed ATT read response, see example/att_delayed_read_response.c 885- ATT Server: allow to specify security requirements seperately for read/writes. .h files need to be regenerated 886 887### Fixed 888- RFCOMM: fix infinite loop on L2CAP connection error (regression from 4c3eeed1) 889- HSP HS: accept incomming SCO connection 890- SM: fix iteration over LE Device DB entries for bonding and address resolving 891- SM: store pairing information only if both devices have requested bonding 892 893--- 894 895## Changes February 2018 896 897### Added 898- GATT Client: gatt_client_request_can_write_without_response_event() causes GATT_EVENT_CAN_WRITE_WITHOUT_RESPONSE 899- SM: new event SM_EVENT_PAIRING_COMPLETE 900- GAP: support iteration over stored Classic link keys: gap_link_key_iterator_init, gap_link_key_iterator_get_next, gap_link_key_iterator_done 901- GAP: add gap_delete_all_link_keys 902 903### Changed 904- GATT Client: round robin for multiple connections 905- ATT Dispatch: round robin for ATT Server & GATT Client 906- L2CAP: round robin for all L2CAP channels (fixed and dynamic) 907- btstack_link_key_db: addition functions for link key iteration 908- GAP: LE scanning enabled not reset on HCI Reset -> can be enabled before HCI Power Up 909- CSR: set all keys in psram instead of default 910 911### Fixed 912- tc3556x: fix startup after baud rate change 913 914--- 915 916## Changes January 2018 917 918### Added 919- Port for Windows with Zephyr HCI Firmware connected via serial port 920- em9304: upload patch containers during HCI bootup 921- Makefile for STM32-F4Discovery port 922- support for console out via SEGGER RTT 923- LE Data Channels example in BTstack and [iOS example on GitHub](https://github.com/bluekitchen/CBL2CAPChannel-Demo) 924- LE Streamer Client can send as fast as possbile as well 925- L2CAP: option to limit ATT MTU via l2cap_set_max_le_mtu 926 927### Changed 928- HCI: allow to set hci_set_master_slave_policy (0: try to become master, 1: accept slave) 929- GAP: gap_set_connection_parameters includes scan interval and window params 930- GATT Client: GATT_EVENT_MTU indicates max MTU 931- ATT DB Util: attribute handle is returned for new Services and Characteristics 932 933### Fixed 934- Windows: retry serial port operations if not all bytes have been read/written 935- HFP: avoid buffer overflows setting up messages 936- SBC Decoder: improved error handling for invalid SBC audio data 937- GAP: fix Connection Parameter Response in Central role 938- ATT DB Util: update pointer to database in case of realloc 939- GATT Client: set UUID16 field if 16-bit UUID is stored as UUID128 940- GAP: release HCI Connnection after gap_le_conne 941- ATT: Exchanged MTU is propagate to ATT Server and GATT Client 942 943--- 944 945## Changes December 2017 946 947### Added 948- Introduced btstack_network.h network interface abstraction 949- btstack_network_posix implementation using Linux tun/tap interface 950- WICED: support for btstack_stdin (HAVE_STDIN) 951- 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. 952- TLV: global TLV instance available via btstack_tlv_get_instance() (src/btstack_tlv.h) 953- TLV: POSIX implementation that appends to a file on disk (platform/posix/btstack_tlv_posix.c 954- LE Device DB TLV: overwrite oldest entry if no free entries available 955- SM: allow to set fixed passkey in display role using sm_use_fixed_passkey_in_display_role 956- Example/hid_host_demo with HID parser and support for basic US keyboard layout 957- 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 958- Port for Apollo2 MCU with EM9304 (ports/apollo2-em9304) 959 960### Changed 961- panu_demo: uses btstack_network.h now 962- WICED: configure printf to replace Linefeed with CRLF 963- SBC: split btstack_sbc_bludroid.c into seperate encoder and decoder implementations 964 965### Fixed 966- RFCOMM: support connection requests during connection failure 967- L2CAP: support connection requests during connection failure 968- L2CAP: fix default remote MTU as 672 instead of 48 (Minimal MTU) 969- HCI: avoid double free during halting 970- SM: fixed reconnect using legacy pairing in slave role 971 972 973