.. _zephyr_1.8:

Zephyr Kernel 1.8.0
####################

We are pleased to announce the release of Zephyr kernel version 1.8.0.

This release ... (overview paragraph of major changes goes here)...

Major enhancements with this release include:

* Tickless kernel
* IP Stack improvements
* Bluetooth 5.0 features
* Ecosystem: Tracing, debugging support through third-party tools
* Improved build support on Mac and Windows development environments
* Improved debug support
* Third-Party compilers support
* Xtensa GCC support
* Initial implementation of MMU/MPU support
* Expanded device support

The following sections provide detailed lists of changes by component.

Kernel
******

* Interesting change

Architectures
*************

* Support for ARC EM Starter Kit version 2.3 added

Boards
******

* Interesting change

Drivers and Sensors
*******************

* UART interrupt-driver API is better defined
* Support for pull-style console API
* nRF5 IEEE 802.15.4 radio driver added
* KW41Z IEEE 802.15.4 radio driver added

Networking
**********

* HTTPS server support added
* HTTP Basic-Auth support added
* IPv6 fragmentation support added
* Add block wise support to CoAP for well-known response
* Big refactoring of network buffer handling
* Start to collect TCP statistics if enabled in config
* IEEE 802.15.4 security support added
* DNS resolver sample application added
* IPv6 multicast listener (MLDv2) support added
* NATS protocol sample application added
* HTTP client and server connectivity fixes
* Network samples Coverity fixes
* Network samples llvm compiler warning fixes
* MQTT publisher connectivity fixes
* 6lo IPv6 header compression fixes
* CoAP connectivity fixes
* DHCPv4 connectivity fixes
* TCP connectivity fixes
* DNS documentation and connectivity fixes
* IPv6 connectivity fixes
* IPv4 ARP fixes
* IEEE 802.15.4 configuration tweaking fixes
* Remove ORFD (Overly Reduced Function Device) 802.15.4 support
* Network offloading driver fixes
* Fix various memory leaks
* Properly check TCP and UDP checksum before accepting packet
* Start RX and TX network threads in proper order
* Network samples documentation fixes and clarifications
* RPL mesh routing fixes
* Network link (MAC) address fixes

Bluetooth
*********

* Host: Added ATT and SMP packet tracking for flow control enforcement
* Host: GATT database changed to a linked list in preparation for dynamic allocation
* Bluetooth 5.0: The Controller reports itself as 5.0-capable
* Bluetooth 5.0: Introduced Channel Selection Algorithm #2 support
* Bluetooth 5.0: Added Multiple PHY support, both 2Mbit/s and long-range coded
* Bluetooth 5.0: Integrated Scan Request notifications
* Controller: Added Low Duty Cycle Directed Advertising support
* Controller: Added Scan duplicate filtering support
* Controller: Enforced complete role separation in the controller for smaller builds
* Controller: Introduced Advanced Controller configuration with several new Kconfig options
* Controller: Changed the radio interrupts to direct ISRs to reduce interrupt latency
* Added HCI Controller to Host flow control support in both Host and Controller
* BR/EDR: Added HFP (e)SCO audio channel establishment support
* BR/EDR: Added support for a functional SDP server
* micro:bit: Added a new sample that implements a game of Pong over BLE

Build and Infrastructure
************************

* Interesting change

Libraries
*********

* Interesting change

HALs
****

* Interesting change

Documentation
*************

* Board documentation added for new board ports
* Continued migration of wiki.zephyrproject.org material to website and github wiki
* Improved CSS formatting and appearance of generated documents
* Added breadcrumb navigation header with kernel version number
* Updated getting started setup guides for Linux, Windows, and macOS
* Updates and additions to follow new and updated kernel features
* Broken link and spelling check scans
* Removed deprecated kernel documentation (pre 1.6 release) from website (still available in git repo if needed)

Tests and Samples
*****************

* Interesting change

Deprecations
************

* Interesting change

JIRA Related Items
******************

.. comment  List derived from Jira query: ...

* :jira:`ZEP-248` - Add a BOARD/SOC porting guide
* :jira:`ZEP-339` - Tickless Kernel
* :jira:`ZEP-540` - add APIs for asynchronous transfer callbacks
* :jira:`ZEP-628` - Validate RPL Routing node support
* :jira:`ZEP-638` - feature to consider: flag missing functionality at build time when possible
* :jira:`ZEP-720` - Add MAX30101 heart rate sensor driver
* :jira:`ZEP-828` - IPv6 - Multicast Join/Leave Support
* :jira:`ZEP-843` - Unified assert/unrecoverable error infrastructure
* :jira:`ZEP-888` - 802.15.4 - Security support
* :jira:`ZEP-932` - Adapt kernel sample & test projects
* :jira:`ZEP-948` - Revisit the timeslicing algorithm
* :jira:`ZEP-973` - Remove deprecated API related to device PM, DEVICE\_ and * SYS\_* macros
* :jira:`ZEP-1028` - shrink k_block struct size
* :jira:`ZEP-1032` - IPSP router role support
* :jira:`ZEP-1169` - Sample mbedDTLS DTLS client stability on ethernet driver
* :jira:`ZEP-1171` - Event group kernel APIs
* :jira:`ZEP-1280` - Provide Event Queues Object
* :jira:`ZEP-1313` - porting and user guides must include a security section
* :jira:`ZEP-1326` - Clean up _THREAD_xxx APIs
* :jira:`ZEP-1388` - Add support for KW40 SoC
* :jira:`ZEP-1391` - Add support for Hexiwear KW40
* :jira:`ZEP-1392` - Add FXAS21002 gyroscope sensor driver
* :jira:`ZEP-1435` - Improve Quark SE C1000 ARC Floating Point Performance
* :jira:`ZEP-1438` - AIO: AIO Comparator is not stable on D2000 and Arduino101
* :jira:`ZEP-1463` - Add Zephyr Support in segger SystemView
* :jira:`ZEP-1500` - net/mqtt: Test case for the MQTT high-level API
* :jira:`ZEP-1528` - Provide template for multi-core applications
* :jira:`ZEP-1529` - Unable to exit menuconfig
* :jira:`ZEP-1530` - Hotkeys for the menu at the bottom of menuconfig sometimes doesn't work
* :jira:`ZEP-1568` - Replace arm cortex_m scs and scb functionality with direct CMSIS-core calls
* :jira:`ZEP-1586` - menuconfig: Backspace is broken
* :jira:`ZEP-1599` - printk() support for the '-' indicator  in format string (left justifier)
* :jira:`ZEP-1607` - Json encoding/decoding library
* :jira:`ZEP-1621` - Stack Monitoring
* :jira:`ZEP-1631` - Ability to use k_mem_pool_alloc (or similar API) from ISR
* :jira:`ZEP-1684` - Add Atmel SAM family watchdog (WDT) driver
* :jira:`ZEP-1695` - Support ADXL362 sensor
* :jira:`ZEP-1698` - BME280 support for SPI communication
* :jira:`ZEP-1711` - xtensa build defines Kconfigs with lowercase names
* :jira:`ZEP-1718` - support for IPv6 fragmentation
* :jira:`ZEP-1719` - TCP does not work with 6lo
* :jira:`ZEP-1721` - many tinycrypt test cases only run on ARM and x86
* :jira:`ZEP-1722` - xtensa: tinycrypt does not build
* :jira:`ZEP-1735` - Controller to Host flow control
* :jira:`ZEP-1759` - All python scripts needed for build should be moved to python 3 to minimize dependencies
* :jira:`ZEP-1761` - K_MEM_POOL_DEFINE build error "invalid register name" when built with llvm/icx from ISSM toolchain
* :jira:`ZEP-1769` - Implement  Set Event Mask and LE Set Event Mask commands
* :jira:`ZEP-1772` - re-introduce controller to host flow control
* :jira:`ZEP-1776` - sending LE COC data from RX thread can lead to deadlock
* :jira:`ZEP-1785` - Tinytile: Flashing not supported with this board
* :jira:`ZEP-1788` - [REG] bt_enable: No HCI driver registered
* :jira:`ZEP-1800` - Update external mbed TLS library to latest version (2.4.2)
* :jira:`ZEP-1812` - Add tickless kernel support in HPET timer
* :jira:`ZEP-1816` - Add tickless kernel support in LOAPIC timer
* :jira:`ZEP-1817` - Add tickless kernel support in ARCV2 timer
* :jira:`ZEP-1818` - Add tickless kernel support in cortex_m_systick timer
* :jira:`ZEP-1821` - Update PM apps to use mili/micro seconds instead of ticks
* :jira:`ZEP-1823` - Improved Benchmarks
* :jira:`ZEP-1825` - Context Switching KPI
* :jira:`ZEP-1836` - Expose current ecb_encrypt() as bt_encrypt() so host can directly access it
* :jira:`ZEP-1856` - remove legacy micro/nano kernel APIs
* :jira:`ZEP-1857` - Build warnings [-Wpointer-sign] with LLVM/icx (bluetooth_handsfree)
* :jira:`ZEP-1866` - Add Atmel SAM family I2C (TWIHS) driver
* :jira:`ZEP-1880` - "samples/grove/temperature": warning raised when generating configure file
* :jira:`ZEP-1886` - Build warnings [-Wpointer-sign] with LLVM/icx (tests/net/nbuf)
* :jira:`ZEP-1887` - Build warnings [-Wpointer-sign] with LLVM/icx (tests/drivers/spi/spi_basic_api)
* :jira:`ZEP-1893` - openocd: 'make flash' works with Zephyr SDK only and fails for all other toolchains
* :jira:`ZEP-1896` - [PTS] L2CAP/LE/CFC/BV-06-C
* :jira:`ZEP-1899` - Missing board documentation for xtensa/xt-sim
* :jira:`ZEP-1908` - Missing board documentation for arm/nucleo_96b_nitrogen
* :jira:`ZEP-1910` - Missing board documentation for arm/96b_carbon
* :jira:`ZEP-1927` - AIO: AIO_CMP_POL_FALL is triggered immediately after aio_cmp_configure
* :jira:`ZEP-1935` - Packet loss make RPL mesh more vulnerable
* :jira:`ZEP-1936` - tests/drivers/spi/spi_basic_api/testcase.ini#test_spi - Assertion Fail
* :jira:`ZEP-1946` - Time to Next Event
* :jira:`ZEP-1955` - Nested interrupts crash on Xtensa architecture
* :jira:`ZEP-1959` - Add Atmel SAM family serial (UART) driver
* :jira:`ZEP-1965` - net-tools HEAD is broken for QEMU/TAP
* :jira:`ZEP-1966` - Doesn't seem to be able to both send and receive locally via local address
* :jira:`ZEP-1968` - "make mrproper" removes top-level dts/ dir, makes ARM builds fail afterwards
* :jira:`ZEP-1980` - Move app_kernel benchmark to unified kernel
* :jira:`ZEP-1984` - net_nbuf_append(), net_nbuf_append_bytes() have data integrity problems
* :jira:`ZEP-1990` - Basic support for the BBC micro:bit LED display
* :jira:`ZEP-1993` - Flowcontrol Required for CDC_ACM
* :jira:`ZEP-1995` - samples/subsys/console breaks xtensa build
* :jira:`ZEP-1997` - Crash during startup if co-processors are present
* :jira:`ZEP-2008` - Port tickless idle test to unified kernel and cleanup
* :jira:`ZEP-2009` - Port test_sleep test to unified kernel and cleanup
* :jira:`ZEP-2011` - Retrieve RPL node information through CoAP requests
* :jira:`ZEP-2012` - Fault in networking stack for cores that can't access unaligned memory
* :jira:`ZEP-2013` - dead object monitor code
* :jira:`ZEP-2014` - Defaul samples/subsys/shell/shell fails to build on QEMU RISCv32 / NIOS2
* :jira:`ZEP-2019` - Xtensa port does not compile if CONFIG_TICKLESS_IDLE is enabled
* :jira:`ZEP-2027` - Bluetooth Peripheral Sample won't pair with certain Android devices
* :jira:`ZEP-2029` - xtensa: irq_offload() doesn't work on XRC_D2PM
* :jira:`ZEP-2033` - Channel Selection Algorithm #2
* :jira:`ZEP-2034` - High Duty Cycle Non-Connectable Advertising
* :jira:`ZEP-2037` - Malformed echo response
* :jira:`ZEP-2048` - Change UART "baud-rate" property to "current-speed"
* :jira:`ZEP-2051` - Move away from C99 types to zephyr defined types
* :jira:`ZEP-2052` - arm: unhandled exceptions in thread take down entire system
* :jira:`ZEP-2055` - Add README.rst in the root of the project for github
* :jira:`ZEP-2057` - crash in tests/net/rpl on qemu_x86 causing intermittent sanitycheck failure
* :jira:`ZEP-2061` - samples/net/dns_resolve networking setup/README is confusing
* :jira:`ZEP-2064` - RFC: Making net_shell command handlers reusable
* :jira:`ZEP-2065` - struct dns_addrinfo has unused fields
* :jira:`ZEP-2066` - nitpick: SOCK_STREAM/SOCK_DGRAM values swapped compared to most OSes
* :jira:`ZEP-2069` - samples: net: dhcpv4_client: runs failed on frdm k64f board
* :jira:`ZEP-2070` - net pkt doesn't full unref after send a data form bluetooth's ipsp
* :jira:`ZEP-2076` - samples: net: coaps_server: build failed
* :jira:`ZEP-2077` - Fix IID when using CONFIG_NET_L2_BLUETOOTH_ZEP1656
* :jira:`ZEP-2080` - No reply from RPL node after 20-30 minutes.
* :jira:`ZEP-2092` - [NRF][BT] Makefile:946: recipe for target 'include/generated/generated_dts_board.h' failed
* :jira:`ZEP-2114` - tests/kernel/fatal : Fail for QC1000/arc
* :jira:`ZEP-2125` - Compilation error when UART1 port is enabled via menuconfig
* :jira:`ZEP-2132` - Build samples/bluetooth/hci_uart fail
* :jira:`ZEP-2138` - Static code scan (coverity) issues seen
* :jira:`ZEP-2143` - Compilation Error on Windows 10 with MSYS2
* :jira:`ZEP-2152` - Xtensa crashes on startup for cores with coprocessors
* :jira:`ZEP-2178` - Static code scan (coverity) issues seen


Known Issues
************

* :jira:`ZEP-0000` - Title
  - Workaround if available, or "No workaround, will address in a future release."