RIOT-2021.07 - 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 2021.07 release includes:

• Many improvements to ztimer usage
• Added nucleo-wl55jc and Seeeduino XIAO boards
• stm32f1 kconfig support
• Fixed multiplication overflow in calloc, a.k.a. BadAlloc, for all supported platforms

169 pull requests, composed of 339 commits, have been merged since the last release, and 16 issues have been solved. 37 people contributed with code in 69 days. 685 files have been touched with 23625 (+) insertions and 7000 deletions (-).

Notations used below

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

New features and changes

System Libraries (21)

• congure_mock: add capability to provide actual methods (#16133)
• dhcpv6_client: add DNS recursive name server option handling (#16585)
• drivers/ethos: enable multiple instances (#16544)
• drivers/slipdev: report NETOPT_ADDRESS to simulate l2 address (#16531)
• gnrc_lorawan: add support for RTT (ztimer) (#14558)
• sys/byteorder: add little endian to/from buf functions (#16363)
• sys/crypto: Enable support for AES-192, AES-256 (#16183)
• sys/event/timeout: add option to use ztimer as backend (#16505)
• sys/event: add periodic timeout event (#16507)
• sys/ps: enable runtime_usec output for the ps command (#16470)

• gnrc_dhcpv6_client_6lbr: choose downstream if as !upstream (#16530)
• net/emcute: Allow RETAIN flag to be set on incoming PUBLISHs (#16326)
• net/gnrc/rpl: use ztimer_msec if available (#16339)
• net/grnc/sixlowpan/ctx: use ztimer_msec if available (#16340)
• sys/arduino: replace xtimer by ztimer as high-level background timer (#15317)
• sys/auto_init: move sock_dtls after network stack initialization (#16528)
• sys/Makefile.dep: Some cleanup (#16268)
• sys/net/gnrc/netif: Make aac_mode a flag field (#16596)
• sys/trickle: migrate from xtimer to ZTIMER_MSEC (#16322)
• sys/ztimer: use highest frequency for nrf51 as well (#16572)
• ztimer: pull ztimer_periph_rtt for ZTIMER_MSEC if available (#16553)
• sys/shell/sc_gnrc_rpl: Err out early if RPL not even started (#16358)

Networking (4)

• drivers/nrf24l01p_ng: add hook nrf24l01p_ng_eui_get() (#16296)

• pkg/nimble/netif: allow to apply and enforce random and unique connection intervals (#16372)
• pkg/semtech-loramac: don't force ztimer rtt backend (#16566)

Packages (8)

• pkg/nanopb: add dependency for C++ source files (#16504)
• pkg/edhoc-c: initial commit (#16295)
• pkg: add QR Code generator package (#16462)

• pkg/libcose: Update to latest master (#16464)
• pkg/lvgl: remove internal thread (#16486)
• pkg/nanocbor: bump version (#16362)
• pkg/pkg.mk: avoid git fetch if commit is already there (#16514)
• pkg/wakaama: remove gnrc dependency (#16563)

Boards (10)

• board/feather-nrf52840: add uf2 boot loader (#16276)
• boards/atmega: add USEC_ADJUST values (#16554)
• boards/esp32-wrover-kit: add dependency to ILI9341 (#16488)
• boards/nucleo-wl55jc: Initial support (#16255)
• boards/z1: add CONFIG_ZTIMER_USEC_ADJUST_% values (#16555)
• boards: Adding board support for the Seeeduino XIAO (#16469)

• board/nrf52840dongle: fix and enhance pin mapping for I2C and SPI (#16401)
• Configuration extension for arduino-nano-33-iot (#16301)
• cpu/kinetis: use LPTMR as rtt backend (#16546)
• makefiles/stdio.inc.mk: stdio_uart require uart or lpuart (#16331)

CPU (12)

• cpu/atxmega/periph: Add spi driver (#16290)
• cpu/efm32: add RTT_FREQUENCY support to efm32 (#16344)
• cpu/esp*: add CLOCK_CORECLOCK (#16361)
• cpu/lpc23xx: implement periph/flashpage (#16409)
• SAML21 CPU: support 4MHz, 8MHz, 12MHz CORE_CORECLOCK choices (#16433)

• CPU SAML21: fix timers frequency when using slow clocks (#16446)
• cpu/avr8_common: fix errno (#16565)
• cpu/native: make thread stacksize defines overridable (#16457)
• cpu/sam0_common: UART: Revert "implement inverted RX & TX" (#15205)
• cpu/stm32/periph/rtt_all: RTT peripheral support for CPU_FAM_STM32L5 (#16545)
• cpu/stm32: Generate the irqs in a reproducible manner (#16511)
• ieee802154/hal: adapt frame filter and source address matching changes (#15468)

Device Drivers (13)

• cpu/atxmega/periph: Add i2c driver (#16306)
• cpu/esp_common: Support disabling I2C clock stretching in ESP8266 (#16386)
• cpu: add periph_rtt_overflow feature (#16420)
• drivers/at86rf215: add RX timestamps (#16365)
• drivers/periph: flashpage: add common helper functions (#15908)
• drivers/rtt_rtc: implement rtc_get_time_ms() (#16347)
• drivers/si70xx: Add support for Si705x sensors (#15684)
• drivers/{disp_dev,touch_dev}: add auto_init_screen as default module when used (#16485)
• esp8266: Support UART1 and other UART0 pins. (#16387)

• cpu/sam0_common: only include RTC/RTT symbols if module is used (#16421)
• driver/bmx280: remove unused xtimer dependency (#16400)
• drivers/cc2420: register with netdev (#15012)
• drivers/ccs811: fix default config for ccs811_full (#16454)

Documentation (5)

• doc: README: Add documentation on downloads and release cycle (#16345)

• doc/pkg: provide a longer short description (#16352)
• docs: Remove references to Freenode from the documentation (#16571)
• Documentation: Remove mentions of the users@ and devel@ mailing lists. (#16428)
• README: Update url of documentation (#16436)

Build System / Tooling (11)

• make: introduce QUIETER (#16513)
• riotctrl_ctrl: A reset helper class for native (#15978)
• TAKEOVER: makefiles/color: Add color functions, new attempt (#16434)
• tools/dhcpv6-pd_ia: add Linux Mint to installer (#16410)
• tools/iotlab-testbed: add support for remote debugger (#16510)

• esptool: Allow to pass the partition table CSV (#16307)
• makefiles/boot/riotboot.mk: pass IOTLAB_NODE (#16562)
• makefiles/boot/riotboot: clean bootloader when cleaning application (#16197)
• makefiles/info-global.inc.mk: fix DEFAULT_MODULE inclusion (#16435)
• makefiles/vars.inc.mk: update USE_PROGRAMMER_WRAPPER_SCRIPT comment (#16404)
• tools/iotlab-tested: several improvements in single board support (#16501)

Kconfig (3)

• cpu/stm32f1: Add Kconfig dependency modeling (#16483)
• Kconfig: expose IEEE 802.15.4 Security to Kconfig (#16515)

• pkg/lvgl: bump to latest version + model configuration in Kconfig (#16346)

Examples (2)

• examples/lorawan: add missing sx126x descriptor (#16592)

• examples/gnrc_networking: use ztimer_msec if available (#16343)

Testing (15)

• .github: add automatic PR labeler action (#16476)
• gh-actions: release-tests: add filter input (#16432)
• tests/pkg_qr-code-generator: add disp-dev for esp32-wrover-kit (#16492)
• tests/riotboot/flashwrite: add automatic test (#15559)

• gh-actions/release-tests: export QUIETER to docker (#16581)
• Simplify kconfig murdock testing (#16487)
• tests/congure-turo: reset before opening terminal (#16564)
• tests/disp_dev: improve genericity of application + optimize screen refresh (#16479)
• tests/gnrc_dhcpv6_client_6lbr: Update test for DHCPv6 MUD option (#16593)
• tests/malloc: refactor test (#16427)
• tests/periph_rtt_min: adapt for slower RTTs (#16329)
• tests/pkg_qr-code-generator: improve display speed in test application (#16466)
• tests/pkg_tensorflow-lite/Makefile.ci: explicit list (#16354)
• tests/touch_dev: improve genericity by using auto_init_screen module (#16480)
• tests/ztimer_periodic: iterate over clocks (#16254)

API Changes (3)

• build system: Rework EXTERNAL_MODULE_DIRS (#16104)
• ieee802154: migrate netdev_ieee802154_dst_filter to a common ieee802154 (#16576)
• net/gcoap: change return type from gcoap_req_send() to ssize_t (#16526)

And 22 minor changes.

Deprecations

Deprecations (3)

• gnrc_lorawan: encode LoRaWAN port in netif header (#16080)
• tools/testbed: use IOTLAB_NODE=auto instead of auto-ssh (#16491)
• pkg/openthread: deprecate ot_command related functions (#15664)

Removals (1)

• core/lifo: Remove lifo [after 2021.04] (#16098)

Bug fixes (34)

• .github/labeler: quote rules (#16519)
• core/msg.c: fixed msg_queue_print() (#15168)
• cpu/atmega_common: RTC: fix off-by-one second normalization & simplify rtc_get_time() (#16442)
• cpu/esp8266: Fix typo in esp_gdbstub config. (#16304)
• cpu/sam0/i2c: Handle read with I2C_NOSTOP flag (#16605)
• cpu/sam0_common: ethernet: fix RX detection (#16383)
• cpu/stm32/gpio_all: fix IRQ handler for G0/L5/MP1 families (#16319)
• cpu/stm32/gpio_f1: fix IRQ handler (#16478)
• cpu/stm32/periph/spi: fix wrong parameter order (#16418)
• dist/Kconfiglib: fix autoconf header (#16561)
• doc: fix URLs to the new website (#16445)
• drivers/lis2dh12: clean up API (#16328)
• drivers/sx126x: fix netdev send and recv function (#16570)
• Fix Cortex-M hard faults when building with -O3 or -Ofast (#16414)
• gnrc_ipv6_nib: consider all local interfaces when looking for address (#16569)
• gnrc_ipv6_nib: consider all prefixes when deciding on-link next hop (#16532)
• gnrc_ipv6_nib: get node from proper interface (#16548)
• gnrc_lorawan: fix undefined state when PSDU is NULL (#16586)
• gnrc_netif/lorawan: drop netif header on send (#16584)
• gnrc_sock: imply end-point netif only if unset (#16643)
• NanoCBOR: Bump version (#16580)
• net/ieee802154_security: small bugfix and stricter names (#16106)
• pkg/nanocbor: bump version (#16538)
• pkg/nimble/netif: fix and optimize NimBLE buffer sizes (#16503)
• pkg/nimble/netif: fix randomized conn intervals (#16601)
• pkg/nimble: temporary fix to NimBLE PRNG seed issue (#16338)
• pkg/qdsa: force qdsa to lowercase (#16552)
• release-test: fetch host key for lille site (#16575)
• shell/sc_nimble_netif: fix _connect_name scan dur (#16337)
• sys/malloc_thread_safety: fix potential overflow in multiplication (#16443)
• sys/net/gnrc/netif: make gnrc_netif_create() blocking to avoid race condition (#16527)
• sys/ztimer: convert clock do not require pm (#16573)
• tests/msg_queue_print: fix test on hw (#16525)
• tests: small fixes (#16426)

Known issues

Network related issues (51)

• 6lo gnrc fragmentation expects driver to block on TX (#7474)
• 6lo: RIOT does not receive packets from Linux when short_addr is set (#11033)
• Address registration handling inappropriate (#15867)
• app/netdev: application stops working after receiving frames with assertion or completely without error (#8271)
• at86rf2xx: Dead lock when sending while receiving (#8242)
• at86rf2xx: lost interrupts (#5486)
• border_router: significant packet loss when sending out packets using USB cdc-ecm on nrf52 (#16411)
• CC2538 RF overlapping PIN usage (#8779)
• core: "Invalid read of size 4" (#7199)
• cpu/esp8266: Tracking open problems of esp_wifi netdev driver (#10861)
• dist/tools/sliptty/start_network.sh: IPv6 connectivity is broken on PC (#14689)
• driver/mrf24j40: blocks shell input with auto_init_gnrc_netif (#12943)
• drivers/at86rf215: Incorrect channel number set for subGHz (#15906)
• DTLS examples cannot send message to localhost (#14315)
• Emcute cannot create a double-byte name (#12642)
• ethernet: Missing multicast addr assignment (#13493)
• ethos: fails to respond to first message. (#11988)
• ethos: Unable to choose global source address. (#13745)
• ethos: Unable to handle fragmented IPv6 packets from Linux kernel (#12264)
• examples/cord_ep: Dead lock when (re-)registering in callback function (#12884)
• examples/gnrc_border_router: esp_wifi crashes on disconnect (#14679)
• Forwarding a packet back to its link layer source should not be allowed (#5051)
• gcoap example request on tap I/F fails with NIB issue (#8199)
• gcoap: Suspected crosstalk between requests (possible NULL call) (#14390)
• General 802.15.4/CC2538 RF driver dislikes fast ACKs (#7304)
• gnrc ipv6: multicast packets are not dispatched to the upper layers (#5230)
• gnrc_border_router stops routing after a while (#16398)
• gnrc_icmpv6_echo: flood-pinging another node leads to leaks in own packet buffer (#12565)
• gnrc_ipv6: Multicast is not forwarded if routing node listens to the address (#4527)
• gnrc_rpl: missing bounds checks in _parse_options (#16085)
• gnrc_sock_udp: Possible Race condition on copy in application buffer (#10389)
• gomach: Resetting netif with cli doesn't return (#10370)
• LoRaWan node ISR stack overflowed (#14962)
• lwip_sock_tcp / sock_async: received events before calling sock_accept() are lost due to race condition. (#16303)
• Missing drop implementations in netdev_driver_t::recv (#10410)
• net: netdev_driver_t::send() doc unclear (#10969)
• netdev_ieee802154: Mismatch between radio ll address and in memory address (#10380)
• nrf52: Not able to add global or ULA address to interface (#13280)
• nrfmin: communication not possible after multicast ping with no interval (#11405)
• openthread: does not build on current Arch (#10809)
• ping6 is failing when testing with cc2538dk (#13997)
• pkg/tinydtls: auxiliary data API does not work for async sockets (#16054)
• pkg: libcoap is partially broken and outdated (#7737)
• Possible memory leak in RIOT/build/pkg/ndn-riot/app.c (#15638)
• Riot-os freezes with lwip + enc28j60 + stm32L4 (#13088)
• samr30 xpro doesn't seem to use its radio ok (#12761)
• scan-build errors found during 2019.07 testing (#11852)
• send data with UDP at 10HZ, the program die (#11860)
• stale border router does not get replaced (#12210)
• Unclear how Router Solicitations are (or should be) handled (#15926)
• xbee: setting PAN ID sometimes fails (#10338)

Timer related issues (15)

• cpu/native: timer interrupt issue (#6442)
• misc issues with tests/trickle (#9052)
• MSP430: periph_timer clock config wrong (#8251)
• periph/timer: timer_set() underflow safety check (tracking issue) (#13072)
• periph_timer: systematic proportional error in timer_set (#10545)
• saml21 system time vs rtc (#10523)
• Sleep mode for Arduino (#13321)
• stm32_common/periph/rtc: current implementation broken/poor accuracy (#8746)
• sys/newlib: gettimeofday() returns time since boot, not current wall time. (#9187)
• tests: xtimer_drift gets stuck on native (#6052)
• xtimer mis-scaling with long sleep times (#9049)
• xtimer: add's items to the wrong list if the timer overflows between _xtimer_now() and irq_disable() (#7114)
• xtimer_set_msg: crash when using same message for 2 timers (#10510)
• xtimer_usleep stuck for small values (#7347)
• xtimer_usleep wrong delay time (#10073)

Drivers related issues (19)

• (almost solved) SPI SD-Card driver: SPI initialisation freeze until timeout (#14439)
• adc is not a ADC-Driver but a analog pin abstraction (#14424)
• at86rf2xx: Simultaneous use of different transceiver types is not supported (#4876)
• cpu/msp430: GPIO driver doesn't work properly (#9419)
• driver/hts221: Temperature and Humidity readings incorrect (#12445)
• ESP32 + DHT + SAUL reading two endpoints causes freeze. (#12057)
• examples/dtls-wolfssl not working on pba-d-01-kw2x (#13527)
• fail to send data to can bus (#12371)
• floats and doubles being used all over the place. (#12045)
• mdt_erase success, but vfs_format resets board (esp32-heltec- lora32-v2) (#14506)
• periph/spi: Switching between CPOL=0,1 problems on Kinetis with software CS (#6567)
• periph: GPIO drivers are not thread safe (#4866)
• Potential security and safety race conditions on attached devices (#13444)
• PWM: Single-phase initialization creates flicker (#15121)
• sam0_eth: extremely long time to RX (frames stuck in buffer?) (#16451)
• STM32: SPI clock not returning to idle state and generating additional clock cycles (#11104)
• TCP client cannot send read only data (#16541)
• Two bugs may lead to NULL dereference. (#15006)
• w5100 driver's improvement (#16417)

Native related issues (6)

• examples/ccn-lite: floating point exception while testing on native (#15878)
• examples/micropython: floating point exception while testing on native (#15870)
• native not float safe (#495)
• native: tlsf: early malloc will lead to a crash (#5796)
• SDL2 does not work due to missing getpid (#13501)
• SIGFPE on native architecture when printing double floats on Ubuntu 21.04 (#16282)

Other platforms related issues (24)

• Failing tests on FE310 (Hifive1b) (#13086)
• arm7: printf() with float/double not working (#11885)
• boards/hifive1: flashing issue (#13104)
• Cannot use LLVM with Cortex-M boards (#13390)
• cpu/cortexm_common: irq_enable returns the current state of interrupts (not previous) (#10076)
• cpu/sam0: flashpage write / read cycle produces different results depending on code layout in flash (#14929)
• cpu/stm32f1: CPU hangs after wake-up from STOP power mode (#13918)
• esp32-wroom-32: tests/netstats_l2 failing sometimes (#14237)
• esp32: can't use newer C++ standard than c++11 (#15685)
• esp8266 precompiled bootloaders don't support partitions past 1MB (#16402)
• esp8266: Hangs when erasing spi sector on mtd0 if using esp_wifi (#16281)
• gcoap/esp8266: Stack overflow with gcoap example (#13606)
• I found stm32 DMA periph driver bugs! when I tested stm32l431rc board. (#16242)
• Incorrect default $PORT building for esp32-wroom-32 on macOS (#10258)
• MIPS: toolchain objcopy doesn't work and no .bin can be generated (#14410)
• MPU doesn't work on cortex-m0+ (#14822)
• periph_timer: Test coverage & broken on STM32F767ZI (#15072)
• riscv: ISR stack is too small for ENABLE_DEBUG in core files (#16395)
• stm32152re: hardfault when DBGMCU_CR_DBG* bits are set and branch after __WFI() (#14015)
• stm32f7: Large performance difference between stm32f746 and stm32f767 (#14728)
• sys/riotboot/flashwrite: unaligned write when skipping RIOTBOOT_MAGIC on stm32wb (#15917)
• tests/mpu_noexec_ram: fails on i-nucleo-lrwan1 (#14572)
• XFA support on AVR and MSP430 broken with binutils 2.36.1 (#16251)

Build system related issues (15)

• buildtest uses wrong build directory (#9742)
• make -j flash fails due to missing make dependencies or make flash-only rebuilds the .elf (#16385)
• Build dependencies - processing order issues (#9913)
• build: info-build doesn't work with boards without port set (#15185)
• BUILD_IN_DOCKER ignores USEMODULE (#14504)
• Different build behavior between murdock and riot/riotbuild:latest image (#9645)
• dist/tools/cppcheck/cppchck.sh: errors when running with Cppcheck 1.89 (#12771)
• doxygen: riot.css modified by 'make doc' (#8122)
• LTO broken (binaries too large) (#16202)
• macros: RIOT_FILE_RELATIVE printing wrong file name for headers (#4053)
• make: ccache leads to differing binaries (#14264)
• make: Setting constants on compile time doesn't really set them everywhere (#3256)
• make: use of immediate value of variables before they have their final value (#8913)
• Tracking: remove harmful use of export in make and immediate evaluation (#10850)
• Windows AVR Mega development makefile Error (#6120)

Other issues (41)

• [TRACKING] sys/shell refactoring. (#12105)
• _NVIC_SystemReset stuck in infinite loop when calling pm_reboot through shell after flashing with J-Link (#13044)
• make term no longer works with JLinkExe v6.94 (#16022)
• make term output is inconsistent between boards, ethos and native (#12108)
• assert: c99 static_assert macro doesn't function for multiple static_asserts in the same scope (#9371)
• Basic test for periph/rtt introduced in #15431 is incorrect (#15940)
• boards/esp32-wroom-32: tests/mtd_raw flakey (#16130)
• Bug: openocd 0.10.0-6 Ubuntu dies while debugging with -rtos auto (#13285)
• C++11 extensions in header files (#5561)
• Can't build relic with benchmarks or tests (#12897)
• CC2538DK board docs: broken links (#12889)
• edbg: long lines flooded over serial become garbled (#14548)
• examples / tests: LoRa tests fail on platforms that don't support LoRa (#14520)
• File systems report names with leading slashes (#14635)
• flashing issue on frdm-k64f (#15903)
• Gcoap drops long packages instead of gracefully erring out (#14167)
• I2C not working under RIOT with U8G2 pkg (#16381)
• Making the newlib thread-safe (#4488)
• nanocoap: incomplete response to /.well-known/core request (#10731)
• Order of auto_init functions (#13541)
• pkg/tinydtls: Multiple issues (#16108)
• Possible memset optimized out in crypto code (#10751)
• Potential race condition in compile_and_test_for_board.py (#12621)
• pyterm on stdio_cdc_acm stops working after a few seconds (#16077)
• RIOT cannot compile with the latest version of macOS (10.14) and Xcode 10 (#10121)
• RIOT is saw-toothing in energy consumption (even when idling) (#5009)
• riotboot/nrf52840dk: flashing slot1 with JLINK fails (#14576)
• scheduler: priority inversion problem (#7365)
• sys/fmt: Missing tests for fmt_float, fmt_lpad (#7220)
• sys/riotboot: documentation issues (#11243)
• sys/stdio_uart: dropped data when received at once (#10639)
• tests/cpp11_*: failing on i-nucleo-lrwan1 (#14578)
• tests/lwip target board for python test is hardcoded to native (#6533)
• tests/pkg_libhydrogen: test fails on master for the samr21-xpro with LLVM (#15066)
• tests/pkg_tensorflow-lite: tests randomly failing on nrf52dk and esp32-wroom-32 (#13133)
• tests/test_tools: test fails while testing on samr21-xpro/iotlab-m3 (#15888)
• tests: broken with stdio_rtt if auto_init is disabled (#13120)
• tests: some tests don't work with newlib lock functions. (#12732)
• Tracker: Reduce scope on unintended COMMON variables (#2346)
• usb-serial/list-ttys.sh: Broken when a debugger offers multiple serial ports (#15814)
• Use of multiple CAN bus on compatible boards (#14801)

There are 171 known issues in this release

Fixed Issues since the last release (2021.04)

• All but first ping to downstream interface fails (#16547)
• pkg/lvgl: LoadProhibitedCause exception on BOARD=esp32-wrover-kit (#16471)
• SX127x Join procedure failed (The Things Network) (#16419)
• riotctrl: shell interaction seems timing sensitive (#16415)
• at86rf231 initialization loses race against auto_init_gnrc_rpl (#16359)
• cpu/sam0_common: Ethernet driver stops working after a while (#16298)
• Conflict between nimble and uwb-core packages (#15528)
• pkg/ccn-lite: unable to make -j -C examples/ccn-lite-relay (#14288)
• make -j flash broken on esp* (will always flash the previous binary) (#13492)
• sys/xtimer: segmentation fault: in function xtimer_msg_received_timeout (#13345)
• drivers/srf04: incorrect values on ATmega based platforms (#13079)
• Indeterministic hard fault in _mutex_lock(), with nRF52 SoftDevice (#10122)
• mrf24j40: does not link for examples/default (#8752)
• nRF52: gnrc_6lowpan_ble: memory leak with nordic_softdevice_ble (#6018)
• OSX + SAMR21-xpro: shell cannot handle command inputs larger than 64 chars (#5863)

16 fixed issues since last release (2021.04)

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

Matrix and Forum

• Join the RIOT Matrix room at: #riot-os:matrix.org
• Join the RIOT Forum at: forum.riot-os.org

Note: IRC was removed

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.