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2021.01-devel

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Development branch towards 2021.01 release

2020.10-RC1

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Merge pull request RIOT-OS#15156 from fabian18/add_const_to_ciphers

Add const to ciphers

2020.07.1

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miri64 Martine Lenders
RELEASE 2020.07.1

RIOT-2020.07.1 - Release Notes
==============================
This is a bug fixing release for the RIOT 2020.07 release.
The following bugs were fixed:

    - pkg/lwip: Compatibility with IS_USED()
    - pkg/lwip: Use IS_ACTIVE() & NETCONNTYPE_ISIPV6()

2020.07

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miri64 Martine Lenders
RELEASE 2020.07

RIOT-2020.07 - Release Notes
============================
RIOT is a multi-threading operating system which enables soft real-time
capabilities and comes with support for a range of devices that are typically
found in the Internet of Things: 8-bit and 16-bit microcontrollers as well as
light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, soft
real-time capabilities, small memory footprint, modularity, and uniform API
access, independent of the underlying hardware (with partial POSIX compliance).

RIOT is developed by an international open-source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by RIOT.

About this release:
===================

The 2020.07 release puts a focus on the improvement of automated testing. In
that vein, various new CI integrations such as CircleCI for documentation
building and online presentation, and Github Actions to check the tooling of
RIOT when merged. The `riotctrl_shell` python module allows to abstract shell
commands as python methods for testing using the newly created `riotctrl`
python package [1]. Kconfig migration reached phase 2 with various board
features being exposed to Kconfig. New network protocols were ported for RIOT
such as MQTT (in form of the `paho-mqtt` package) and the lookup client
component for CoRE RD `cord_lc`. The OpenWSN network stack with 6TiSCH support
was reintegrated into RIOT. Support for several new boards and new sensors was
added. Additionally, this release contains a number of bug fixes and test
improvements.

546 pull requests, composed of 10452 commits, have been merged since the
last release, and 84 issues have been solved. 64 people contributed with
code in 106 days. 2371 files have been touched with 822149 (+) insertions and
700313 deletions (-).

[1]: https://pypi.org/project/riotctrl/

Notations used below:
=====================

    + means new feature/item
    * means modified feature/item
    - means removed feature/item

New features and changes
========================

Core
----
* core: make idle thread optional
+ macros/units: add unit conversion helper macros
+ msg: add message bus
* panic: launch USB bootloader on crash for easy recovery

System libraries
----------------
* auto_init: automatically determine auto_init_*.c
* base64: Clean up / improve implementation
+ hashes: add sha224 and reuse sha256 code
+ luid: provide luid_get_lb()
+ phydat: added phydat to JSON converter
+ posix: initial import of select() function (only support sockets for now)
* ps: show free stack space in addition to used and total
* shell:
  + add optional hooks for shell commands
  * native: stop RIOT when the shell reads EOF
  * refactor readline function
  * refactor tokenizer code
+ shell_commands:
  * alias ping=ping6
  + provide command to reboot to bootloader
+ stdio_semihosting: Initial include of Semihosting-based STDIO
+ touch_dev: add generic API for touch device
+ trace: add trace module
+ pm: Add pm_get_blocker()
* random:
  + add option to use HWRNG as source of randomness
  * optimize sha1prng
* usb:
  * allow for boards to define default custom VID/PID
  * warn on test-ID usage in a unified location
+ xtimer: xtimer_rmutex_lock_timeout
* ztimer:
  + add power management for ztimer clocks
  * expose ZTIMER_MSEC/USEC_BASE

Networking
----------
+ cord: add CoRE RD lookup client implementation
+ gcoap: add CoAP ping request
* gnrc:
  + gnrc_ipv6_ext_opt: initial import of hop-by-hop and destination option
    handling
  * gnrc_netif:
    + add IPv6 event bus
    + add option for non-std 6lo MTU
    + add support for internal event loop
    * use gnrc_netif-submodules to pull in upper-layer struct members
  * gnrc_nettype: indirect NETTYPE definition via pseudo-modules
  * gnrc_pktdump: fix dependencies
  * gnrc_tcp:
    + add retransmission timer
    * rewrite API internal messaging
    * rewrite recv buffer allocation/returning
  * use exponent to configure message queue sizes
* nanocoap: allow coap_opt_add_string() for non-zero-terminated strings
+ netif: add functions to get and get by identifier
+ sock_dtls: provide getter function for UDP sock
* sock_util: add interface descriptor parsing to str2ep

Packages
--------
* pkg: rework checkout process
  * avoid copying Makefiles in package source when possible
  * store packages sources in a global package directory
* pkg: cleanup build system integration for
  - cryptoauthlib, openthread, semtech-loramac, tinydtls, wakaama, u8g2,
    ucglib, wolfssl
* pkg: tools: ensure cmake based packages/tools are built out-of-source
+ cryptoauthlib: wake pulse implementation for CPUs supporting
  `periph_i2c_reconfigure`
+ emlearn: add support to RIOT
* gecko_sdk: update to v2.7.6
* lwip:
  * add IPv4 support for `netdev_tap`
  * add support for nrf802154
  * enable IPv4/IPv6 dual stack mode
  + lwip_sock: provide implementation for `sock_*_recv_buf()`
- lua: remove unnecessary patch
+ paho-mqtt: add package and example
* nimble:
  + add static connection manager `statconn`
  * netif:
    * set host thread prio to 1
    * simplify mbuf pool initialization
  * update NimBLE ver (cd7d7aa286) + timing param cleanup
+ openwsn: re-integrate the network stack as a package
* tinydtls:
  + add `sock_async` support for `sock_dtls`
  + use latest development version (eda63f000c)
* ucglib: refactoring and fixes

Boards
------
+ cc1352p-launchpad: add support
* common/blxxxpill:
  + provide periph_rtt
  * improve adc
+ dwm1001: add support to Decawave DWM1001 dev board
+ mcb2388: misc enhancements
+ nrf52840-dongle: add support
+ nrf52840dk: Add MTD configuration
+ nucleo-g474re: add support
* pic32-clicker: rename to 6lowpan-clicker
+ samr30-xpro: add SPI dev for ext pin header
+ samr3x-xpro: add riotboot feature
+ serpente: add support
+ sltb001a: enable CCS811 sensor
+ sodaq-sff: add support for SODAQ SFF
+ stm32f429i-disco: add support
+ weact-f411ce: add support
+ wemos-zero: add support

CPU
---
* arm7_common: Update to inlineable IRQ API
* atmega_common: Update to inlineable IRQ API
* cortexm:
  + allow to define reserved fields in CortexM vector table
  * "free" SVC
* cc26x2_cc13x2:
  * add oscillator switching functions
  * add periph_i2c implementation
  * trim device registers on `cpu_init`
* esp32:
  * support of multiple heaps for newlib malloc
  * replace RTC implementation by RTT implementation
* fe310: migrate to inlined IRQ API
+ kinetis: implement power modes for pm_layered
* lpc2387:
  * pm: enable SLEEP & POWERDOWN mode
  * timer: use lpc2387_pclk_scale()
+ mips_pic32_common: Implement GPIO IRQ
+ native:
  + add periph_eeprom driver implementation
  * rename trace -> backtrace
+ nrf52:
  + add black magic probe config
  + add missing vendor files
  + implement EasyDMA-based SPI peripheral implementation
+ nrf52811: initial support
* nrf5x_common:
  * add configurable RTT_FREQUENCY
  * enable bias correction in hwrng
* sam0_common:
  + add DMA peripheral driver
  + add PWM support for saml21, samd5x
  + implement periph/dac
  * make SPI peripheral DMA compatible
  * move PWM to common code
  * spi: move clk pin muxing into spi_acquire / spi_release
  + UART: implement inverted RX & TX
* samd21: PWM don't hard-code number of channels to 3
* samd5x: allow to use XOSC as clock source
* saml1x: pm: set deep flag
+ stm32:
  + add QDEC support for CPU_FAM_STM32F1
  + add non-blocking UART
  * decrease latency in SPI DMA path
  + implement reset to bootloader
  * filter availability of RNG by CPU not by board
  * stm32_common: make RTT_FREQUENCY configurable
  + stm32f4: Add DMA config for SPI
  + stm32g4: add support

Device Drivers
--------------
+ atwinc15x0: add WiFi netdev driver
+ at: Add at_urc_isr module to process URCs upon arrival
+ at24cxxx: MTD wrapper for at24cxxx
+ at86rf215:
  + implement MR-O-QPSK
  + implement MR-OFDM
+ at86rf2xx: add support for high data rates
+ dfplayer: New driver for the DFPlayer Mini MP3 player
* ethos: use luid_get_eui48()
+ edbg_eui: add driver to get MAC address from Atmel EDBG
+ mhz19: initial support
+ mrf24j40: add Turbo Mode
+ mtd_spi_eeprom: add MTD wrapper for AT25XXX EEPROMs
+ pca9633: add new driver
+ periph/timer: add timer_set_periodic()
+ periph/i2c: add periph_i2c_reconfigure feature & implementation for sam0
+ periph/rtt: introduce RTT_MIN_OFFSET
+ periph/spi: add periph_spi_reconfigure feature & implementation for sam0
* pulse_counter: Use C11 atomics & bugfix
+ sdp3x : Add driver for sdp3x sensor

Build System / Tooling
----------------------
+ make:
  + add code generator targets
  + add JLink support for stm32
  * docker.inc.mk: add and use generic docker_run_make
  + allow multiple external board dirs
  + info-global.inc.mk: add info-boards-features-blacklisted
  * resolve dependencies before Makefile.include
+ riotctrl_shell:
  + initial import of shell interaction spawn
  + provide ipv6_nib interactions and parsers
  + provide netif interactions and parsers
+ tools:
  + add script to run radvd on a tun interface
  + provide tool to parse `pktbuf` output
  * kconfiglib:
    * add riot_kconfig to override default behaviours
    * kconfiglib: bump to v14.1.0

Testing
-------
+ fuzzing framework:
  + add AFL-based fuzzing setup for network modules
  + add fuzzing application for gcoap
+ ci: setup github actions
+ sys/test_utils/dummy_thread: initial commit
+ tests/irq_disable_restore: Add test for irq_disable() / irq_restore()
+ tests/periph_spi: add benchmark for acquire / release
+ tests/periph_spi_dma: Add test for SPI with DMA
+ uncrustify: add auto uncrustify with blacklist

Kconfig migration
-----------------
+ armv7_m/cortexm: declare CPU_ARCH and CPU_CORE
+ boards: Model features in Kconfig
  + arduino-leonardo, arduino-mega2560, atmega128x-based, atmega256rfr2-based,
    atmega328p-based, cc2538-based, cc26xx_cc13xx-based, efm32-based, esp-based,
    fe310-based, kinetis-based, msp430-based, samr21-xpro, slwstk6220a
* kconfig: Declare common feature symbols
+ drivers: Expose Configurations to Kconfig
  + ads101x, at, at86rf215, bmx055, cc110x, dose.h, fxos8700, hdc1000, isl29020,
    l3g4200d, lpsxxx, mag3110, mma8x5x, motor_driver, mtd_sdcard, opt3001,
    pn532, rn2xx3, slipdev, sps30, tcs37727, tmp00x
+ networking: Expose configurations to Kconfig
  + asymcute, coap, csma
  + gnrc:
    + gomach, lwmac, mac, pktdump, pktbuf, rpl, tcp
+ usbus/cdc/ecm: Expose configurations to Kconfig

API Changes
===========
- cpu/sam0_common: drop prescaler from timer config
- cpu/sam0_common: PWM config now requires GCLK source
- drivers/mtd: Change API to return 0 on success
- drivers/mtd_mapper: count offset in sectors
- net/sock_dtls: provide getter function for UDP sock
- net/sock_dtls: add timeout to sock_dtls_send and add sock_dtls_session_init

    diff --git a/sys/include/net/sock/dtls.h b/sys/include/net/sock/dtls.h
    index 96569723fc..6e66048bd4 100644
    --- a/sys/include/net/sock/dtls.h
    +++ b/sys/include/net/sock/dtls.h
    @@ -476,6 +485,13 @@
     extern "C" {
     #endif

    +#ifndef DTLS_HANDSHAKE_BUFSIZE
    +#define DTLS_HANDSHAKE_BUFSIZE  (256)   /**< Size buffer used in handshake to
    +                                             hold credentials */
    +#endif
    +
    +#define SOCK_DTLS_HANDSHAKE     (EXDEV) /**< Return value for a successful
    +                                             handshake */
    +
     /**
      * @brief DTLS version number
    @@ -546,26 +564,26 @@ void sock_dtls_init(void);
     int sock_dtls_create(sock_dtls_t *sock, sock_udp_t *udp_sock,
                          credman_tag_t tag, unsigned version, unsigned role);

    +
     /**
    - * @brief Creates a new DTLS session
    + * @brief Initialize session handshake.
      *
    - * Initializes handshake process with a DTLS server  at @p ep.
    - *
    - * @param[in]  sock     DLTS sock to use
    - * @param[in]  ep       Remote endpoint of the session
    - * @param[out] remote   The created session, cannot be NULL
    + * Sends a ClientHello message to initialize the handshake. Call
    + * @ref sock_dtls_recv() to finish the handshake.
      *
    - * @return  0 on success
    - * @return  -EAGAIN, if DTLS_HANDSHAKE_TIMEOUT is `0` and no data is available.
    - * @return  -EADDRNOTAVAIL, if the local endpoint of @p sock is not set.
    - * @return  -EINVAL, if @p remote is invalid or @p sock is not properly
    - *          initialized (or closed while sock_udp_recv() blocks).
    - * @return  -ENOBUFS, if buffer space is not large enough to store received
    - *          credentials.
    - * @return  -ETIMEDOUT, if timed out when trying to create session.
    + * @param[in] sock      DTLS sock to use
    + * @param[in] ep        Remote endpoint to start a handshake with
    + * @param[out] remote   Resulting session
    + *
    + * @return 1, if new handshake is started
    + * @return 0, if there is an existing session
    + * @return -ENOMEM, not enough memory to allocate for new peer
    + * @return -EADDRNOTAVAIL, if the local endpoint of @p sock is not set.
    + * @return -EINVAL, if @p remote is invalid or @p sock is not properly
    + *         initialized (or closed while sock_udp_recv() blocks).
      */
    -int sock_dtls_session_create(sock_dtls_t *sock, const sock_udp_ep_t *ep,
    -                             sock_dtls_session_t *remote);
    +int sock_dtls_session_init(sock_dtls_t *sock, const sock_udp_ep_t *ep,
    +                           sock_dtls_session_t *remote);

     /**
      * @brief Destroys an existing DTLS session
    @@ -578,7 +596,7 @@ int sock_dtls_session_create(sock_dtls_t *sock, const sock_udp_ep_t *ep,
     void sock_dtls_session_destroy(sock_dtls_t *sock, sock_dtls_session_t *remote);

     /**
    - * @brief Decrypts and reads a message from a remote peer.
    + * @brief Receive handshake messages and application data from remote peer.
      *
      * @param[in] sock      DTLS sock to use.
      * @param[out] remote   Remote DTLS session of the received data.
    @@ -593,7 +611,8 @@ void sock_dtls_session_destroy(sock_dtls_t *sock, sock_dtls_session_t *remote);
      *
      * @note Function may block if data is not available and @p timeout != 0
      *
    - * @return The number of bytes received on success
    + * @return  The number of bytes received on success
    + * @return  -SOCK_DTLS_HANDSHAKE when new handshake is completed
      * @return  -EADDRNOTAVAIL, if the local endpoint of @p sock is not set.
      * @return  -EAGAIN, if @p timeout is `0` and no data is available.
      * @return  -EINVAL, if @p remote is invalid or @p sock is not properly
    @@ -657,28 +676,32 @@ ssize_t sock_dtls_recv_buf(sock_dtls_t *sock, sock_dtls_session_t *remote,
      *                      if no session exist between client and server.
      * @param[in] data      Pointer where the data to be send are stored
      * @param[in] len       Length of @p data to be send
    + * @param[in] timeout   Handshake timeout in microseconds.
    + *                      If `timeout > 0`, will start a new handshake if no
    + *                      session exists yet. The function will block until
    + *                      handshake completed or timed out.
    + *                      May be SOCK_NO_TIMEOUT to block indefinitely until
    + *                      handshake complete.
      *
    - * @note Function may block until a session is created if there is no
    - *       existing session with @p remote.
    - *
    - * @note Initiating a session through this function will require
    - * @ref sock_dtls_recv() called from another thread to receive the handshake
    - * messages.
    + * @note    When blocking, we will need an extra thread to call
    + *          @ref sock_dtls_recv() function to handle the incoming handshake
    + *          messages.
      *
      * @return The number of bytes sent on success
    + * @return  -ENOTCONN, if `timeout == 0` and no existing session exists with
    + *          @p remote
      * @return  -EADDRINUSE, if sock_dtls_t::udp_sock has no local end-point.
      * @return  -EAFNOSUPPORT, if `remote->ep != NULL` and
      *          sock_dtls_session_t::ep::family of @p remote is != AF_UNSPEC and
      *          not supported.
    - * @return  -EHOSTUNREACH, if sock_dtls_session_t::ep of @p remote is not
    - *          reachable.
      * @return  -EINVAL, if sock_udp_ep_t::addr of @p remote->ep is an
      *          invalid address.
      * @return  -EINVAL, if sock_udp_ep_t::port of @p remote->ep is 0.
      * @return  -ENOMEM, if no memory was available to send @p data.
    + * @return  -ETIMEDOUT, `0 < timeout < SOCK_NO_TIMEOUT` and timed out.
      */
     ssize_t sock_dtls_send(sock_dtls_t *sock, sock_dtls_session_t *remote,
    -                       const void *data, size_t len);
    +                       const void *data, size_t len, uint32_t timeout);

     /**
      * @brief Closes a DTLS sock
    @@ -694,6 +717,47 @@ ssize_t sock_dtls_send(sock_dtls_t *sock, sock_dtls_session_t *remote,
      */
     void sock_dtls_close(sock_dtls_t *sock);

    +/**
    + * @brief Creates a new DTLS session
    + *
    + *  Initiates a handshake with a DTLS server at @p ep and wait until it
    + * completes or timed out.
    + *
    + * @deprecated Will not be available after the 2020.10 release.
    + *             Please use @ref sock_dtls_session_init() and
    + *             @ref sock_dtls_recv() instead.
    + *
    + * @param[in]  sock     DLTS sock to use
    + * @param[in]  ep       Remote endpoint of the session
    + * @param[out] remote   The created session, cannot be NULL
    + * @param[in]  timeout  Timeout to wait for handshake to finish.
    + *                      Returns immediately if 0.
    + *                      May be SOCK_NO_TIMEOUT to wait indefinitely until
    + *                      handshake complete.
    + *
    + * @return  0 on success
    + * @return  -ENOMEM, if no memory to allocate for new peer
    + * @return  -EADDRNOTAVAIL, if the local endpoint of @p sock is not set.
    + * @return  -EINVAL, if @p remote is invalid or @p sock is not properly
    + *          initialized (or closed while sock_udp_recv() blocks).
    + */
    +static inline int sock_dtls_session_create(sock_dtls_t *sock, const sock_udp_ep_t *ep,
    +                                    sock_dtls_session_t *remote, unsigned timeout)
    +{
    +    int res;
    +    uint8_t buf[DTLS_HANDSHAKE_BUFSIZE];
    +
    +    assert(sock);
    +    assert(remote);
    +
    +    res = sock_dtls_session_init(sock, ep, remote);
    +    if (res <= 0) {
    +        return res;
    +    }
    +
    +    return sock_dtls_recv(sock, remote, buf, sizeof(buf), timeout);
    +}
    +
     #include "sock_dtls_types.h"

     #ifdef __cplusplus

Deprecations
============

Warnings
--------
- GNRC_MAC_ENABLE_DUTYCYCLE_RECORD: Will be removed after 2021.01 release. Use
  inverse CONFIG_GNRC_MAC_DISABLE_DUTYCYCLE_RECORD instead.
- saul_reg_rm(): will be removed at a future date
- sock_dtls_session_create(): will be removed after 2020.10 release. Please
  use sock_dtls_session_init() and sock_dtls_recv() instead
- pkg/nordic_softdevice_ble: will be removed after the 2020.10 release

Removals
--------
- netdev: remove NETOPT_IPV6_IID support for network devices

Known issues
============

Networking related issues (44)
------------------------------
        after debug break
        sometimes
        packet buffer
        address
       assertion or completely without error
       chars
       address

Timer related issues (17)
-------------------------
       time.
       _xtimer_now()  and irq_disable()

Drivers related issues (13)
---------------------------
        timeout
        clock cycles
       supported

Native related issues (3)
-------------------------

Other platforms related issues (19)
-----------------------------------
        __WFI()
        (not previous)
       boards
       CS

Build system related issues (13)
--------------------------------
        evaluation
       image
       value

Other issues (41)
-----------------
        esp32-wroom-32
        shell after flashing with J-Link
        10
       static_asserts in the same scope
       everywhere

There are 150 known issues in this release

Fixed Issues since the last release (2020.04)
=============================================

        current page
        RIOT/examples/emcute_mqttsn/.
        on Nucleo-f401re
       configured prefix
       LTO

42 fixed issues since last release (2020.04)

Acknowledgements
================
We would like to thank all companies that provided us with hardware for porting
and testing RIOT-OS. Further thanks go to companies and institutions that
directly sponsored development time. And finally, big thanks to all of you
contributing in so many different ways to make RIOT worthwhile!

More information
================
http://www.riot-os.org

Mailing lists
-------------
* RIOT OS kernel developers list
  devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
  users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
  commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
  notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)

IRC
---
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os

License
=======
* The code developed by the RIOT community is licensed under the GNU Lesser
  General Public License (LGPL) version 2.1 as published by the Free Software
  Foundation.
* Some external sources and packages are published under a separate license.

All code files contain licensing information.

2020.07-RC3

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Merge pull request RIOT-OS#14586 from leandrolanzieri/backport/2020.0…

…7/pr/examples/cord_epsim_parse_with_str2ep

examples/cord_epsim: default to first interface when not specified [backport 2020.07]

2020.07-RC2

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Merge pull request RIOT-OS#14537 from bergzand/backport/2020.07/pr/co…

…rtexm/irq_during_idle

cortexm_common: disable IRQ during thread_sched_idle [backport 2020.07]

2020.10-devel

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Development branch towards 2020.10 release

2020.07-RC1

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cpu/stm32/qdec: test null callback pointer (RIOT-OS#14125)

cpu/stm32/qdec: test if callback pointer is set

Callback pointer is not tested and could result in a hard fault
if the pointer is NULL.
Thus only activate interrupt if a callback provided.

Signed-off-by: Gilles DOFFE <g.doffe@gmail.com>

2020.04

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leandrolanzieri Leandro Lanzieri
2020.04 RELEASE 2020.04

RIOT-2020.04 - Release Notes
============================
RIOT is a multi-threading operating system which enables soft real-time
capabilities and comes with support for a range of devices that are typically
found in the Internet of Things: 8-bit and 16-bit microcontrollers as well as
light-weight 32-bit processors.

RIOT is based on the following design principles: energy-efficiency, soft
real-time capabilities, small memory footprint, modularity, and uniform API
access, independent of the underlying hardware (with partial POSIX compliance).

RIOT is developed by an international open-source community which is
independent of specific vendors (e.g. similarly to the Linux community) and is
licensed with a non-viral copyleft license (LGPLv2.1), which allows indirect
business models around the free open-source software platform provided by RIOT.

About this release:
===================

The 2020.04 release includes:

- Add support for 6LoWPAN IPv6 extension header next header compression
- Add support for DHCPv6 prefix delegation client
- Add support for kw41zrf and at86rf215 IEEE 802.15.4 radios
- Improvements on power management for ESP32
- Improvements and extensions in support of fe310 and lpc2387
- lwIP: provide support for asynchronous sock
- Improvements on xtimer module and testing
- Initial addition of the new timer subsystem: ztimer
- Migration to Kconfig - phase I: add multiple GNRC and system modules
- +10 new boards, +11 new drivers, +7 new packages

555 pull requests, composed of 1514 commits, have been merged since the
last release, and 22 issues have been solved. 60 people contributed with
code in 102 days. 3346 files have been touched with 358398 (+) insertions and
184720 deletions (-).

Notations used below:
=====================

    + means new feature/item
    * means modified feature/item
    - means removed feature/item

New features and changes
========================

System libraries
----------------
* core:
    + add optional support for executable space protections
    * sched: sched.h: remove not needed bitarithm include to avoid conflict
    + turn kernel_init.c and panic.c into submodules of core
+ sys/auto_init: allow delayed initialization of SAUL & gnrc_netif
* sys/base64: implement Base 64 Encoding with URL and Filename Safe Alphabet
* sys/crypto: define cipher using a module instead of CFLAGS
* sys/crypto/modes/ccm: handle input_len = 0
* sys/ecc: fix assertion in golay2412
* sys/event:
    + add event_wait_timeout64()
    + add shared event threads
* sys/newlib:
    + enable multiple heaps in _sbrk_r()
    * syscalls_default: update heap_stats for multiple heaps
* sys/puf_sram: counter based seed after soft reset
* sys/phydat: improvement of phydat_dump including test application
* sys/shell:
    + add rtt command
    * correctly detect and handle long lines
+ sys/shell_commands: + provide command to print version
* sys/spp: randomize canary value on each build
* sys/suit:
    * cleanup of TinyCBOR to NanoCBOR refactor
    * coap: make use of exposed tree handler function
    * update to draft-ietf-v3
+ sys/uri_parser: initial import of a minimal and non-destructive URI parsing
* sys/usb: use default VID/PID for RIOT-included peripherals
* sys/xtimer:
    * set now pointer correctly in _update_short_timers() loop
    + add xtimer_set_timeout_flag64()
    * xtimer_mutex_lock_timeout fix with short timeout
+ sys/ztimer: initial import

Networking
----------
* net/coap:
    * deprecate gcoap_add_qstring() and update uses
    + Packet API function to add Uri-Query option
+ net/dhcpv6: initial implementation of a client (with IA_PD support)
* net/dns: fix DNS resolution in ping6
* net/gcoap:
    + add canonical uri query function names
    + allow proxied client requests
    * use sock_async and events
+ net/gnrc_dhcpv6_client_6lbr: initial import of a 6LBR DHCPv6 client
+ net/gnrc_ipv6_ext_frag: initial import of statistics module
* net/gnrc_ipv6_nib:
    * do not ignore prefix list for route resolution
    * fix border router with DNS & Context Compression
    * only route to prefix list entry if on-link
* net/gnrc_lorawan:
    * fix the handling of downlink frames without payload
    * remove netdev layer from MAC
* net/gnrc_netif:
    + add gnrc_netif_send and gnrc_netif_highlander functions
    * implementation of dynamic GNRC_NETIF_NUMOF approach
* net/gnrc_nettype: deprecate IOVEC type
* net/gnrc_pktbuf: deprecate gnrc_pktbuf_replace_snip()
+ net/gnrc_sixlowpan_iphc: add support for IPv6 extension header compression
+ net/gnrc_sock: provide implementation for `sock_*_recv_buf()`
* net/gnrc_sock_udp: choose random ephemeral port
- net/gnrc_tftp: remove module
* net/gnrc_uhcpc:
    * ensure compression context is managed by the ABR
    * only configure 6Lo-ND features if wireless-interface is 6LN
    * update compression context with new prefix
* net/nanocoap:
    + add coap_opt_add_uquery2() with parameter key value length
    + add convenience function for adding path elements
    * add uquery improvements
    * make separate tree handling function
    - remove obsolete functions for addition of Uri-Query option
+ net/netdev: add netdev_trigger_event_isr() function
- net/nhdp: remove module
+ net/sock:
    * async: add optional callback argument
    + amend with zero-copy receive functions
    + amend API to iterate over stack-internal buffer chunks

Packages
--------
+ pkg/cmsis-nn: add support
+ pkg/cryptoauthlib: add support
+ pkg/libbase58: add support
- pkg/libcose: remove monocypher crypto mode
+ pkg/littlefs2: add support for LittleFS v2.x.y
+ pkg/lvgl: add initial support for LittlevGL
* pkg/lwip:
    + add auto-init support for transceiver ENC28J60
    + provide sock_async support
* pkg/micropython: bump version for FreeBSD fix
* pkg/monocypher: bump to version 3.0.0
* pkg/nanopb: bump version to 0.4.1
* pkg/nimble/autoconn: various improvements
- pkg/oonf_api: remove support
+ pkg/qcbor: add support
* pkg/tinydtls: remove receive buffer indirection via mbox
* pkg/wolfssl: bump version to 4.3.0
+ pkg/yxml: add support Yxml XML parser library package

Boards
------
* boards: include common dfu logic where applicable
+ boards/adafruit-clue: add initial support
* boards/arduino-mkr: feather-m0: sodaq-*: provide stdio over USB and
  setup automatic flash with bossa
+ board/arduino-nano-33-ble: add initial support
+ boards/cc1312-launchpad: add support and documentation
* boards/feather-nrf52840:
    * use CDC ACM as default STDIO
    * fix LED macros
+ boards/esp32-heltec-lora32-v2: add support
+ boards/im880b: add support
+ boards/kw41z-mini: add support
* boards/mega-xplained: fix ADC line definitions
* boards/nrf51: fix UART hardware flow-control configuration
* boards/nucleo-l152re: fix uart1 pinout config
+ boards/nucleo-l412kb: add initial support
* boards/sam[r/d]21-xpro: prefer XOSC32K for RTC/RTT (GCLK2)
* boards/same54-xpro:
    * configure remaining EXT connectors
    * don't source peripheral clocks from main clock
* boards/samr30: add helper for antenna switch
* boards/stm32l4: add common clock configuration
+ boards/olimexino-stm32: add support
+ boards/openlabs-kw41z-mini-256kib: add support
* boards/openmote-b: add SAUL configuration and note about flashing
+ boards/p-nucleo-wb55: add initial support
+ boards/pic32*: add GPIO SAUL configuration
* boards/pinetime:
    * add defines for controlling the backlight pin
    * update mtd_spi_nor config
    * fix battery ADC line define
* doc/doxygen:
    + add 'Creating boards' section
    * improvements on various board's documentation

CPU
---
* cpu:
    * add CPU feature for stack smash protections
    + add UART RX implementation on PIC32 devices
    * make default idle/main stacksizes configurable on all archs
    * move cpu level dependencies in dedicated Makefile.dep files
    * unify UART hardware flow control use to a generic module
* cpu/atmega_common: fix reboot issues
* cpu/cc13x2: rename cpu to cc26x2_cc13x2
* cpu/cc2538:
    * fix spi_transfer_bytes()
    + implement periph/pm
    * timer: handle power mode
* cpu/cc26xx_cc13xx: add power common code
* cpu/cortexm:
    + add support for Cortex-M interrupt sub-priorities
    * cleanup dependencies
    * move CPU_ARCH/FAM to Makefile.features
    * only enable MPU during low low level init
* cpu/efm32:
    * cleanup of makefiles
    * fix incorrect ADC status register
* cpu/esp_common:
    * allow WiFi modem sleep mode
    + esp-wifi: allow connecting to open networks
    * fixes in common CPU configurations
    * move dependency resolutions to Makefile.dep
* cpu/esp32:
    * activate automatic XTAL detection
    + add support for light/deep sleep and pm_layered
    * allow external 32 kHz crystal for the RTC hardware time
    + esp_wifi: add WPA2 enterprise mode with IEEE 802.1x/EAP authentication
    * fix wake-up sources for sleep mode
+ cpu/esp8266: add RTT implementation
* cpu/fe310:
    * fix power management configuration
    + implement driver for watchdog
* cpu/lpc2387:
    * fix RTC leap year calculation
    + implement periph/adc
    + implement periph/i2c
    * make SPI configurable
* cpu/native: fix c11_atomic sizes on FreeBSD
* cpu/native/can/candev_linux: add check for real can
+ cpu/nrf52/nRF802154: implement CCA
+ cpu/nrf5x: add and enable configuration for the built-in DC/DC converter
* cpu/sam0:
    + add gpio_disable_mux() function
    + add samd21j17d support
    * enhance power saving by switching EIC clock source during STANDBY mode
    * fix handling of PM_NUM_MODES
    + provide interface to query GCLK frequency
    * use generic exti_config
* cpu/samd21: pwm: allow to use channels > 3
* cpu/samd5x: disable RTC on init to prevent undefined RTC state
* cpu/[saml21/1x]: enable buck voltage regulator when possible
* cpu/stm32_common:
    + add USB OTG FS/HS usbdev peripheral driver
    * enable EXTI interrupt for rtt
    * eth: fix address and multicast filtering
* cpu/stm32f1: make RTC Y2038 safe
+ cpu/stm32wb: add initial support

Device Drivers
--------------
* doc: various fixes in driver documentation
+ drivers/apds99xx: add support for APDS99XX ambient light and proximity sensors
+ drivers/at24cxxx: add support for AT24Cxxx family of EEPROMs
+ drivers/at24mac: add support for unique ID chip
+ drivers/at25xx: add support for AT25xxx family of EEPROMs
+ drivers/at86rf215: add basic support for AT86RF215 dual-band radio
* drivers/at86rf2xx:
    * fix receive before send detection
    + implement basic mode
+ drivers/bh1900nux: add support
+ drivers/bme680: add support
+ drivers/can: add CAN support for nucleo-l476rg
+ drivers/cc110x: add support for promiscuous mode
+ drivers/disp_dev: add generic interface for display drivers
* drivers/ds18: fix temperature conversion
+ drivers/hmc5883l: add support for Honeywell HMC5883L magnetometer
+ drivers/kw41zrf: add support for radio
+ drivers/lis2dh12: add interrupt functionality
* drivers/mtd_spi_nor: erase timings in struct
+ drivers/periph_common/rtc: add rtc_mktime() & rtc_localtime() helper functions
+ drivers/rtt_rtc: add RTT-based RTC implementation, enable it for cpu/cc2538,
  nrf5x_common
* drivers/slipdev: provide stdio multiplexing over SLIP
+ drivers/sps30: add support for particulate matter sensor
* drivers/srf08: cleanup driver configuration scheme
+ drivers/stmpe811: add support for touchscreen controller
* drivers/ws281x:
    + add support for esp32
    + add VT100 backend for native

Build System / Tooling
----------------------
* build system: Restructure dependency resolution
* dist:
    * cc2538-bsl: use upstream version
    + dhcpv6-pd_ia: initial import of a DHCPv6 server bootstrapper
    * edbg: update to latest upstream version
    * factor out static tests from build_and_test
    * packer: update vagrant image to Ubuntu 18.04 + refactoring
    + sliptty: introduce a new SLIP to TUN tool
    * sliptty/start_network.sh: configure global address for SLIP interface
    * testbed-support:
        * fix compatibility with cli-tools v3
        * use BINFILE for flashing on iotlab
+ doc: add section on configuration to 'Getting started'
* make:
    * disable implicit rules
    * remove support for make <4
    * native: turn on creation of debug symbols (CFLAGS += -g)
* Makefile:
    * arch: mips: Allow CFLAGS_DBG and CFLAGS_OPT to be overridden
    * boards: move remaining uses of USEMODULE from Makefile.include to
      Makefile.dep
    * disable stdio_% modules before they are included
    * fix duplicate modules from USEMODULE
    * fix sock_udp deps for stnp
    * include package deps earlier
    * info-global.inc.mk: reset BOARDSDIR
    * Makefile.dep: remove usage of DEFAULT_MODULE += stdio%
    * mips: cleanup include makefile
    * move cpu level dependencies in dedicated Makefile.dep files
    * periph_init based on USEMODULE
    * pkg/local.mk: add FORCE target to .PHONY
    + provide CPU as a feature
    * use simple expansion for widely used variables

Testing
-------
* tests:
    + add check_unittests helper function
    + add interactive_sync adapted to shell
    * fix compilation problems with NDEBUG
    * fix for `GNRC_NETIF_SINGLE`
    * fixes for evtimer_msg and bench_runtime_coreapis
+ tests/bench_xtimer_load: initial commit
* tests/buttons: fix build failure if BTN0_PIN is not declared
+ tests/candev: add initial version with native support
+ tests/driver_netdev_common: add compile-test for network drivers
+ tests/emcute: provide tests
+ tests/gnrc_ipv6_nib_dns: add test of RDNSS option handling
* tests/gnrc_rpl_srh: use AsyncSniffer for sniffing
* tests/periph_rtc: fix system locks in ISR
+ tests/xtimer_overhead: initial commit

Kconfig migration
-----------------
Migration to Kconfig as configuration tool is currently on phase 1. Which means
that we are moving configuration options from modules to Kconfig files, and
leaving its use optional.

+ doc: add Kconfig section
* Kconfig:
    * add CPU and Board common symbols
    * add Drivers menu
    * include application-specific symbols first
    * net/gnrc/ipv6: group IPv6 related Kconfig options
+ Expose configurations to Kconfig of:
    + drivers/periph/wdt
    + drivers/mrf24j40
    + net/gcoap
    + net/gnrc/ipv6/ext/frag
    + net/gnrc/ipv6/nib
    + net/gnrc/sixlowpan
    + net/ieee802154
    + net/nanocoap
    + pkg/tinydtls
    + pkg/wakaama
    + sys/usbus
    + usbus/cdc/acm

API Changes
===========
- SUIT: update to draft-ietf-v3
- Makefile.include: remove support for make <4
- net/gnrc_netif: implementation of dynamic GNRC_NETIF_NUMOF approach

- net/sock: amend with zero-copy receive functions:

+ /**
+  * @brief   Releases the stack-internal buffer space provided by the
+  *          `sock_*_recv_buf()` functions.
+  * @param[in] buf_ctx   Stack-internal buffer context to release.
+  */
+ void sock_recv_buf_free(void *buf_ctx);

+ /**
+  * @brief Decrypts and provides stack-internal buffer space containing a
+  *        message from a remote peer.
+  *
+  */
+ ssize_t sock_dtls_recv_buf(sock_dtls_t *sock, sock_dtls_session_t *remote,
+                            void **data, void **buf_ctx, uint32_t timeout);

+ /**
+ * @brief   Provides stack-internal buffer space containing an IPv4/IPv6
+ *          message from remote end point
+ */
+ ssize_t sock_ip_recv_buf(sock_ip_t *sock, void **data, void **buf_ctx,
+                         uint32_t timeout, sock_ip_ep_t *remote);

+ /**
+  * @brief   Provides stack-internal buffer space containing a UDP message from
+  *          a remote end point
+  */
+ ssize_t sock_udp_recv_buf(sock_udp_t *sock, void **data, void **buf_ctx,
+                           uint32_t timeout, sock_udp_ep_t *remote);

- net/sock/async: add optional callback argument:

+ * @param[in] arg   Argument provided when setting the callback using
+ *                  @ref sock_dtls_set_cb(). May be NULL.
  */
- typedef void (*sock_dtls_cb_t)(sock_dtls_t *sock, sock_async_flags_t flags);
+ typedef void (*sock_dtls_cb_t)(sock_dtls_t *sock, sock_async_flags_t flags,
+                                void *arg);

+ * @param[in] arg   Argument provided when setting the callback using
+ *                  @ref sock_ip_set_cb(). May be NULL.
  */
- typedef void (*sock_ip_cb_t)(sock_ip_t *sock, sock_async_flags_t flags);
+ typedef void (*sock_ip_cb_t)(sock_ip_t *sock, sock_async_flags_t flags,
+                              void *arg);

+ * @param[in] arg   Argument provided when setting the callback using
+ *                  @ref sock_tcp_set_cb(). May be NULL.
  */
- typedef void (*sock_tcp_cb_t)(sock_tcp_t *sock, sock_async_flags_t flags);
+ typedef void (*sock_tcp_cb_t)(sock_tcp_t *sock, sock_async_flags_t flags,
+                               void *arg);

+ * @param[in] arg   Argument provided when setting the callback using
+ *                  @ref sock_tcp_queue_set_cb(). May be NULL.
  */
  typedef void (*sock_tcp_queue_cb_t)(sock_tcp_queue_t *queue,
-                                     sock_async_flags_t flags);
+                                     sock_async_flags_t flags,
+                                     void *arg);

+ * @param[in] arg   Argument provided when setting the callback using
+ *                  @ref sock_udp_set_cb(). May be NULL.
  */
- typedef void (*sock_udp_cb_t)(sock_udp_t *sock, sock_async_flags_t type);
+ typedef void (*sock_udp_cb_t)(sock_udp_t *sock, sock_async_flags_t type,
+                               void *arg);

- net/sock/dns: make sock_dns_query() return the length of the address:

/**
 * @brief Get IP address for DNS name
 *
- * @return      0 on success
- * @return      !=0 otherwise
+ * @return      the size of the resolved address on success
+ * @return      < 0 otherwise
 */
int sock_dns_query(const char *domain_name, void *addr_out, int family);

- mtd_spi_nor: move const params to separate struct:

+ /**
+  * @brief Compile-time parameters for a serial flash device
+  */
+ typedef struct {
+     const mtd_spi_nor_opcode_t *opcode; /**< Opcode table for the device */
+     spi_clk_t clk;           /**< SPI clock */
+     uint16_t flag;           /**< Config flags */
+     spi_t spi;               /**< SPI bus the device is connected to */
+     spi_mode_t mode;         /**< SPI mode */
+     gpio_t cs;               /**< CS pin GPIO handle */
+     uint8_t addr_width;      /**< Number of bytes in addresses, usually 3 for small devices */
+ } mtd_spi_nor_params_t;
+

 typedef struct {
     mtd_dev_t base;          /**< inherit from mtd_dev_t object */
-    const mtd_spi_nor_opcode_t *opcode; /**< Opcode table for the device */
-    spi_t spi;               /**< SPI bus the device is connected to */
-    gpio_t cs;               /**< CS pin GPIO handle */
-    spi_mode_t mode;         /**< SPI mode */
-    spi_clk_t clk;           /**< SPI clock */
-    uint16_t flag;           /**< Config flags */
+    const mtd_spi_nor_params_t *params; /**< SPI NOR params */
     mtd_jedec_id_t jedec_id; /**< JEDEC ID of the chip */
     uint32_t page_addr_mask;
     uint32_t sec_addr_mask;
-    uint8_t addr_width;      /**< Number of bytes in addresses, usually 3 for small devices */
     uint8_t page_addr_shift;
     uint8_t sec_addr_shift;
 } mtd_spi_nor_t;

Deprecations
============

Warnings
--------
- `make all-debug` target will be removed for `native` after the 2020.10 release
- net/gcoap: `gcoap_add_qstring()` will be removed after the 2020.10 release
- net/gnrc/nettype: `GNRC_NETTYPE_IOVEC` type will be removed after 2020.10
    release
- net/gnrc_pktbuf: `gnrc_pktbuf_replace_snip()` will be removed after 2020.10
    release
- net/gnrc/sixlowpan: Configuration macro
    `GNRC_SIXLOWPAN_FRAG_RBUF_AGGRESSIVE_OVERRIDE` will be removed after 2020.10
    release.

Removals
--------
- Makefile.include: remove support for GNU make <4
- pkg/oonf_api: remove package
- pkg/tinydtls: remove TINYDTLS_LOG configuration macro
- sys/net/gnrc_tftp: remove module
- sys/net/nhdp: remove module

Known issues (136)
==================

Networking related issues (48)
------------------------------
13834: DHCPv6 client ends up in busy loop after a while
13745: ethos: Unable to choose global source address.
13496: cpu/stm32/eth, board/nucleo-f767z1: ethernet buffering issue (ping >1s)
       after debug break
13490: cpu/stm32/eth, board/nucleo-f767z1: ethernet initialisation fails
       sometimes
13209: examples/gnrc_border_router is crashing after some time
13088: Riot-os freezes with lwip + enc28j60 + stm32L4
12943: driver/mrf24j40: blocks shell input with auto_init_gnrc_netif
12884: examples/cord_ep: Dead lock when (re-)registering in callback function
12858: KW2XRF: Broken network communication without netstats-l2
12857: examples/gnrc_networking_mac broken on ATmega
12565: gnrc_icmpv6_echo: flood-pinging another node leads to leaks in own
       packet buffer
12264: ethos: Unable to handle fragmented IPv6 packets from Linux kernel
12210: stale border router does not get replaced
11988: ethos: fails to respond to first message.
11860: send data with UDP at 10HZ, the program die
11859: examples: dtls-echo fails silently when DTLS_ECC flag enabled
11852: scan-build errors found during 2019.07 testing
11795: gnrc_tftp: string functions on non-null terminated input
11405: nrfmin: communication not possible after multicast ping with no interval
11212: POSIX sockets + lwIP: bad file descriptor
11033: 6lo: RIOT does not receive packets from Linux when short_addr is set
10969: net: netdev_driver_t::send() doc unclear
10861: cpu/esp8266: Tracking open problems of esp_wifi netdev driver
10809: openthread: does not build on current Arch
10410: Missing drop implementations in netdev_driver_t::recv
10389: gnrc_sock_udp: Possible Race condition on copy in application buffer
10380: netdev_ieee802154: Mismatch between radio ll address and in memory
       address
10370: gomach: Resetting netif with cli doesn't return
10338: xbee: setting PAN ID sometimes fails
9709: examples: failed assertion in dtls-echo example
9656: gnrc/netif: various problems after resetting interface a second time
8779: CC2538 RF overlapping PIN usage
8752: mrf24j40: does not link for examples/default
8271: app/netdev: application stops working after receiving frames with
      assertion or completely without error
8242: at86rf2xx: Dead lock when sending while receiving
8199: gcoap example request on tap I/F fails with NIB issue
8172: gnrc_netif, gnrc_uhcpc: Replacing prefix on border router results in no
      configured prefix
8086: gnrc_rpl_p2p: port to nib and fix compile errors
7737: pkg: libcoap is partially broken and outdated
7474: 6lo gnrc fragmentation expects driver to block on TX
7304: General 802.15.4/CC2538 RF driver dislikes fast ACKs
6018: nRF52: gnrc_6lowpan_ble: memory leak with nordic_softdevice_ble
5863: OSX +  SAMR21-xpro: shell cannot handle command inputs larger than 64
       chars
5748: gnrc: nodes crashing with too small packet buffer
5486: at86rf2xx: lost interrupts
5230: gnrc ipv6: multicast packets are not dispatched to the upper layers
5051: Forwarding a packet back to its link layer source should not be allowed
4527: gnrc_ipv6: Multicast is not forwarded if routing node listens to the
       address

Timer related issues (17)
-------------------------
13072: periph/timer: `timer_set()` underflow safety check (tracking issue)
12909: Bug: Unexpected behavior with xtimer_periodic_wakeup() for large periods
       on Nucleo-f401re
11523: xtimer_periodic_wakeup crashing at high frequencies on frdm-kw41z
11149: xtimer: hang on xtimer_spin_until (corner case)
10545: periph_timer: systematic proportional error in timer_set
10523: saml21 system time vs rtc
10510: xtimer_set_msg: crash when using same message for 2 timers
10073: xtimer_usleep wrong delay time
9187: sys/newlib: gettimeofday() returns time since boot, not current wall
      time.
9052: misc issues with tests/trickle
9049: xtimer mis-scaling with long sleep times
8746: stm32_common/periph/rtc: current implementation broken/poor accuracy
8251: MSP430: periph_timer clock config wrong
7347: xtimer_usleep stuck for small values
7114: xtimer: add's items to the wrong list if the timer overflows between
      _xtimer_now()  and irq_disable()
6442: cpu/native: timer interrupt issue
6052: tests: xtimer_drift gets stuck on native

Drivers related issues (9)
--------------------------
13444: Potential security and safety race conditions on attached devices
12445: driver/hts221: Temperature and Humidity readings incorrect
12371: fail to send data to can bus
12045: floats and doubles being used all over the place.
11388: SD card initialization: timeouts effectively blocking
11104: STM32: SPI clock not returning to idle state and generating additional
       clock cycles
9419: cpu/msp430: GPIO driver doesn't work properly
8045: stm32/periph/uart: extra byte transmitted on first transmission
4876: at86rf2xx: Simultaneous use of different transceiver types is not
      supported

Native related issues (3)
-------------------------
11472: Warnings from objcopy and size (binutils 2.32)
5796: native: tlsf: early malloc will lead to a crash
495: native not float safe

Other platforms related issues (18)
-----------------------------------
13606: gcoap/esp8266: Stack overflow with gcoap example
13408: Bug: PWM test crashes on Arduino Mega 2560
13390: Cannot use LLVM with Cortex-M boards
13267: Failing tests on MSP430 (z1)
13104: boards/hifive1: flashing issue
13086:  Failing tests on FE310 (Hifive1b)
12763: [TRACKING] Fixes for automatic tests of ESP32 boards.
12651: Failing tests on AVR (tested with atmega256rfr2-xpro)
12168: pkg/libb2: blake2s doesn't work on AVR
12057: ESP32 + DHT + SAUL reading two endpoints causes freeze.
10258: Incorrect default $PORT building for esp32-wroom-32 on macOS
10122: Indeterministic hard fault in _mutex_lock(), with nRF52 SoftDevice
10076: cpu/cortexm_common: irq_enable returns the current state of interrupts
       (not previous)
8408: pkg/fatfs: linker error when build tests/pkg_fatfs_vfs for msb430 based
      boards
7753: pic32-wifire: race-condition when linking in concurrent build
6567: periph/spi: Switching between CPOL=0,1 problems on Kinetis with software
      CS
5774: cpu: cortexm_common: context switching code breaks when compiling with
      LTO
4954: chronos: compiling with -O0 breaks

Build system related issues (11)
--------------------------------
13492: make -j flash broken on esp* (will always flash the previous binary)
13419: Can't use nimble as prefix for modules
12771: dist/tools/cppcheck/cppchck.sh: errors when running with Cppcheck 1.89
10850: Tracking: remove harmful use of `export` in make and immediate
       evaluation
9913: Build dependencies - processing order issues
9742: `buildtest` uses wrong build directory
9645: Different build behavior between `murdock` and `riot/riotbuild:latest`
      image
8913: make: use of immediate value of variables before they have their final
      value
8122: doxygen: riot.css modified by 'make doc'
6120: Windows AVR Mega development makefile Error
4053: macros: RIOT_FILE_RELATIVE printing wrong file name for headers

Other issues (30)
-----------------
13918: cpu/stm32f1: CPU hangs after wake-up from STOP power mode
13527: examples/dtls-wolfssl not working on pba-d-01-kw2x
13345: sys/xtimer: segmentation fault: in function xtimer_msg_received_timeout
13277: Y2038 tracking issue / strategy
13133: tests/pkg_tensorflow-lite: tests randomly failing on nrf52dk and
       esp32-wroom-32
13120: tests: broken with stdio_rtt if auto_init is disabled
13044: _NVIC_SystemReset stuck in infinite loop when calling pm_reboot through
       shell after flashing with J-Link
12732: tests: some tests don't work with `newlib` lock functions.
12205: core: atomic: Unable to compile starting with gcc 9.1.0
12108: `make term` output is inconsistent between boards, `ethos` and `native`
12105: [TRACKING] sys/shell refactoring.
11885: arm7: printf() with float/double not working
11243: sys/riotboot: documentation issues
10751: Possible memset optimized out in crypto code
10731: nanocoap: incomplete response to /.well-known/core request
10639: sys/stdio_uart: dropped data when received at once
10121: RIOT cannot compile with the latest version of macOS (10.14) and Xcode
       10
9882: sys/tsrb is not thread safe on AVR
9518: periph/i2c: tracking bugs and untested acks
9371: assert: c99 static_assert macro doesn't function for multiple
      static_asserts in the same scope
8589: Why using -F in avrdude?
8436: Kinetis PhyNode: failed to flash binary > 256K
7220: sys/fmt: Missing tests for fmt_float, fmt_lpad
6533: tests/lwip target board for python test is hardcoded to native
5769: Possible problem in scheduler
5009: RIOT is saw-toothing in energy consumption (even when idling)
4866: periph: GPIO drivers are not thread safe
4488: Making the newlib thread-safe
3256: make: Setting constants on compile time doesn't really set them
      everywhere
2346: Tracker: Reduce scope on unintended COMMON variables

There are 137 known issues in this release

Fixed Issues since the last release (2020.01)
=============================================

13920: stm32: ztimer RTT backend overflow
13680: suit-tool runs on every build - ModuleNotFoundError: No module named
       'cbor' when building anything
13587: drivers/cc110x: Lost IRQs can lead to driver deadlock
13471: 6ctx: incorrectly removes 6ctx context when the non-zero part of the
       address matches
13460: Makefile.dep: DEFAULT_MODULE += stdio_rtt will always load dependencies
       - even if other stdio is selected
13459: cpu/cortex-m23: gcc 9 bug when compiling c11 atomics
13447: gnrc_sock_dns is not working
13442: gnrc_networking not sending packets when hardware has multiple
       interfaces
13369: native:in file gnrc_rpl_p2p.c function trickle_start() has extra and
       some undeclared variables.
13358: iotlab-m3: long HW address is in reversed order
13353: tests/unittests/tests-ecc: segfault with golay, when enabling asserts
13309: cpu/native/can: Segmentation fault when manipulating vcan's through
       socketcan
13287: Driver for DS18B20 returns invalid values
13265: tests: compilation of some test applications fail with NDEBUG
13015: Quickest start does not build with vagrant
12854: `pm_reboot()` not working on AVR when compiled with `LTO=1`
12370: Undocumented uint8_t assumptions in nrf52840 peripherals
12037: cpu/sam0_common: i2c baudrate calculation fails if CLOCK_CORECLOCK > 51
       MHz
11026: Recent changes effectively killed modular board designs
8213: at86rf2xx: Basic mode and NETOPT_AUTOACK
8130: gcoap: can't build with network stacks other than GNRC
7020: isr_rfcoreerrors while pinging between CC2538DKs

22 fixed issues since last release (2020.01)

Acknowledgements
================
We would like to thank all companies that provided us with hardware for porting
and testing RIOT-OS. Further thanks go to companies and institutions that
directly sponsored development time. And finally, big thanks to all of you
contributing in so many different ways to make RIOT worthwhile!

More information
================
http://www.riot-os.org

Mailing lists
-------------
* RIOT OS kernel developers list
  devel@riot-os.org (http://lists.riot-os.org/mailman/listinfo/devel)
* RIOT OS users list
  users@riot-os.org (http://lists.riot-os.org/mailman/listinfo/users)
* RIOT commits
  commits@riot-os.org (http://lists.riot-os.org/mailman/listinfo/commits)
* Github notifications
  notifications@riot-os.org (http://lists.riot-os.org/mailman/listinfo/notifications)

IRC
---
* Join the RIOT IRC channel at: irc.freenode.net, #riot-os

License
=======
* The code developed by the RIOT community is licensed under the GNU Lesser
  General Public License (LGPL) version 2.1 as published by the Free Software
  Foundation.
* Some external sources and packages are published under a separate license.

All code files contain licensing information.

2020.04-RC3

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Merge pull request RIOT-OS#13963 from leandrolanzieri/backport/2020.0…

…4/pr/tests/gnrc_dhcpv6_client/fix_test

tests/gnrc_dhcpv6_client: Fix term and increase timeout [backport 2020.04]