RIOT-2023.07 - 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

This release sees the addition of the openDSME IEEE 802.15.4 MAC. So far it is limited to 2.4 GHz O-QPSK and drivers that have been converted to the new sub-MAC architecture yet.

We also have two new supported MCUs: nRF53 and ATmega8. They share common peripherals with their siblings, for nRF53 only the application core is supported so far.

Finally, all tests live in subdirectories now, so the tests/ directory is much more orderly.

288 pull requests, composed of 661 commits, have been merged since the last release, and 35 issues have been solved. 26 people contributed with code in 96 days. 6844 files have been touched with 251875 (+) insertions and 224148 deletions (-).

Notations used below

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

New features and changes

Core

• core/compiler_hints: add assume() hint (#19354)
• core: add core_mutex_debug to aid debugging deadlocks (#18620)

• core/lib: make the use of DEBUG_BREAKPOINT on assert optional (#19766)
• gnrc/ipv6_auto_subnets: allow to configure minimal prefix length (#19656)

System Libraries

• shell/cmds: add genfile command (#19401)
• sys: add common imath module mv isin() form test/driver_dac_dds (#19378)
• usbus: Add support for endpoint halt condition (#17090)

• buildsystem: Always expose CPU_RAM_BASE & SIZE flags (#19746)
• cpp11-compat: thread::sleep_for in microseconds (#19436)
• Rust: Update dependencies (#19495)
• SUIT: Prepared manifests (#19601)
• sys /cpp11-compat: remove pseudo anonymous namespaces (#19477)
• sys/isrpipe: Replace xtimer with ztimer_usec (#19645)
• sys/posix/sockets: fix code style & set sin6_scope_id in _ep_to_sockaddr() (#19658)
• sys: partly refactor make dependency resolution (#19492)
• usbus: Implement USB_FEATURE_DEVICE_REMOTE_WAKEUP handling (#19800)
• ztimer/periodic: remove timer on init if already running (#19806)

Networking

• pkg/opendsme: add initial support for IEEE 802.15.4 DSME time-slotted MAC (#18156)
• sys/string_utils: add memchk() (#19686)

• drivers/sx127x: reduce use of floats (#19697)
• gnrc/gnrc_netif_hdr_print: printout timestamp if enabled (#19589)
• gnrc/ipv6/nib: fix 6Lo ND options on non 6Lo interface (#19604)
• gnrc/rpl: fix incorrect addition overflow check (#19739)
• gnrc_ipv6_nib: include RIO with all subnets in downstream RA (#19644)
• nanocoap: allow to define CoAP resources as XFA (#19296)
• nanocoap: clean up coap_iterate_option(), make it public (#19713)
• nanocoap: implement extended tokens (RFC 8974) (#19487)
• nanocoap_sock: defuse nanocoap_sock_get() API footgun (#19535)
• pkg/openthread: remove deprecated functions (#19685)
• semtech-loramac: extend list of supported radio with sx1261, sx1262 and sx1268 (#19525)

Packages

• pkg/littlefs2: bump version to 2.7 (#19812)
• pkg/lvgl: bump to 8.3.7 (#19542)
• pkg/lvgl: Change all references of LittlevGL to LVGL (#18788)
• pkg/ndn-riot: drop unmaintained pkg (#19612)
• pkg/qcbor: bump to v1.2 (#19494)

Boards

• board: add Adafruit Grand Central M4 Express support (#19580)
• boards,sys/arduino: major clean up (#19759)
• boards/b_u585i_ iot02a/periph usbdev (#19796)
• boards/nucleo-l432k: provide three periph_timer instances (#19677)
• boards/olimex-msp430-h2618: add new board (#19706)
• boards: add ESP32-S3-Box support (#19811)
• boards: add ESP32-S3-USB-OTG support (#19808)
• boards: add stm32l496g-disco support (#19576)
• boards: support for Olimex MSP430-H1611 board (#19558)
• cpu/gd32v: add riotboot support (#19411)
• cpu/native: add host fs access via VFS (#19315)
• cpu/nrf53: add I2C and SPI support (#19798)
• cpu/nrf53: add initial support with nRF5340DK-APP board (#19769)
• cpu/nrf53: add usbdev support (#19809)
• cpu/nrf{53,9160}: add periph_rtt support (#19804)
• cpu/nrf{53,9160}: add pwm support (#19781)
• cpu/rpx0xx: add initial ADC support (#19516)
• drivers/usbdev_synopsys_dwc2: add GD32V support (#19389)

• boards/adafruit-clue: use shared usb_board_reset.mk for flash/reset/term targets (#19616)
• boards/arduino-mkrwan1300: update board name to correct one (#19526)
• boards/atmega8: new board (#19754)
• boards/esp32: deduplication in common ESP32x board definitions (#19432)
• boards/frdm-k22f: fixes long lines in periph_conf.h (#19774)
• boards/nrf9160dk: use all available CC timer channels (#19771)
• boards/nucleo-f429zi: Provide 2nd timer (#19447)
• boards/rpi-pico: specify needed args when using jlink flasher (#19537)
• boards/rpi-pico: update openocd.cfg file (#19717)
• cpu/msp430: reorganize code (#19733)
• cpu/nrf5x/periph/wdt: enable support for nRF53/nRF9160 (#19789)
• cpu/nrf5x_common: rework LFCLK source selection (#19803)
• cpu/rpx0xx: implement periph_spi (#19440)
• cpu/rpx0xx: initial PIO support (#17425)
• makefiles/tools/jlink.inc.mk: use ELF file for flashing (#19541)

CPU

• cpu/avr8 common: added avr4.ld script (#19751)
• cpu/riscv: Add PMP driver (#19712)
• cpu/stm32/periph_dac: small improvements (#19573)
• cpu/stm32/periph_pwm: support of complementary timer outputs (#19572)
• debug: add DEBUG_BREAKPOINT() macro, set breakpoint on failed assertion (#19368)

• build-system: Allow out of tree BUILD_DIR (#19600)
• cpu/arm7: Fix undefined behavior based on invalid assembly (#19619)
• cpu/atmega8: new cpu (#19753)
• cpu/atmega_common: checking features instead of CPU models (#19752)
• cpu/avr8_common: Prepare for rework ISR (#19777)
• cpu/esp32: fix compilation issues with GCC 12.2 (#19450)
• cpu/esp32: fix remaining compilation errors for GCC 12.2 (#19577)
• cpu/nrf53: enable flashpage support (#19802)
• cpu/nrf5x_common: reset all available CC channels (#19770)
• cpu/nrf{52,9160}: remove duplicate sevonpend bit (#19773)
• cpu/sam0_eth: interrupt based link detection/auto-negotiation (#19703)
• cpu/samd5x: enable FDPLL1 at 200MHz (#19581)
• cpu/stm32/periph/adc: fix setting ADC clock (#19629)
• cpu/stm32/periph/dac: optimize setting DAC (#19529)
• cpu/stm32: stm32f4 BRR from BSRR (#19670)
• drivers/at86rf2xx: setting rx timestamp based on symbol counter for ATmega*RFR2 (#19605)
• drivers/periph/rtc: improve doc on rtc_set_alarm (#19610)
• Fix periph clk (#19628)
• makefiles/arch/msp430.inc.mk: Fix compilation issues with GCC 12 (#19484)
• native/syscalls: rename real_clock_gettime to clock_gettime (#19476)
• pkg/cmsis: use unique package for CMSIS headers, DSP and NN modules (#18056)
• pkg/tinydtls: allow build for AVR (#19346)

Device Drivers

• drivers/mtd: add support for MTDs emulated in RAM (#19443)
• drivers/mtd_default: add external declarations for mtd* (#19538)

• driver/lc709203f: remove unnecessary use of float (#19662)
• drivers/lcd: code deduplication for st7735 and ili9341 (#19816)
• drivers/mpu9x50: clean up code (#19657)
• drivers/mrf24j40: cleanup function (#19635)
• drivers/pcf857x: allow to define PCF857x_BASE_ADDR at compile time (#19734)
• drivers/sdcard_spi: small cleanup (#19527)

Documentation

• doc: add board selection guide (#19606)
• SUBSYSTEMD.md: add @kaspar030 to core, Rust, build system, CI & timers (#19727)
• SUBSYSTEMS.md: add @maribu (#19732)
• SUBSYSTEMS.md: add jia200x to subsystems (#19512)

• README.md: Remove HiL Badge (#19453)
• gnrc_sixlowpan_frag_sfr: mark as experimental + doc fixes (#19682)

Build System / Tooling

• buildsystem: add target debug-client (#19725)
• dist/tools/openocd: add OPENOCD_SERVER_ADDRESS variable (#19724)
• dist/tools/openocd: add RTT port variable (#19723)
• tools/build_system_sanity_check: add check to verify test applications are at the right place (#19673)

• dist/testbed-support: remove obsolete boards from iotlab archi (#19514)
• dist/tools/insufficient_memory: fix collection of app folders (#19598)
• dist/tools/openocd: fix parsing of flash bank base (#19620)
• dist/tools/openocd: start debug-server in background and wait (#19737)
• dist/tools/usb-serial: call ttys.py with its path [backport 2023.07] (#19831)
• dist/tools: Use /usr/bin/env to lookup Python. (#19448)
• make/usb_board_reset: define {preflash,term}-delay when necessary (#19617)
• Makefile.include: don't use target lstfile implicitly (#19797)
• Makefile.include: Generate lst file using objdump (#19745)

Kconfig

• pkg/libbase58: add kconfig support (#19623)
• sys: add Kconfig support for clif (#19621)
• sys: add some missing kconfig + adapt related tests when possible (#19622)

• boards/esp32s3-pros3: Fix stdio kconfig model (#19708)
• cpu/esp32: deduplication in Kconfig for ESP32x SoCs (#19433)
• cpu/rpx0xx: Fix kconfig model (#19660)
• drivers/nrf24l01p: model in kconfig (#19650)
• periph/timer: fix Kconfig menu title (#17830)
• pkg/micropython: model in Kconfig (#19672)
• pkg/openthread: Fix Kconfig and broken example (#19700)
• pkg/openthread: model in kconfig (#19671)
• Remodel the USB in Kconfig (#19086)
• sys/stdio_semihosting: model in Kconfig (#19651)
• sys/usb/Kconfig: Fix default PID (#19701)
• sys: model ecc, evtimer, pipe and shell_lock in kconfig (#19636)

Examples

• examples/suit_update: some test fixes (#19643)

Testing

• tests/net/gnrc_mac_timeout: add automated test (#19639)
• tests/README.md: Add directory overview (#19587)

• tests: move all periph applications to their own periphs/ folder (#19552)
• tests: move all pkg applications to their own pkgs/ folder (#19551)
• treewide: fix remaining broken paths to test applications (#19592)
• tests/drivers: move all driver tests into own folder (#19435)
• tests: move all bench applications to their own tests/bench/ folder (#19564)
• tests: move build system applications to tests/build_system (#19567)
• tests: move core related applications to their own tests/core/ folder (#19565)
• tests: move cpu related applications to tests/cpu (#19583)
• tests: move net related applications to test/net (#19586)
• tests: move nimble and lwip related to test applications to tests/pkg (#19582)
• tests: move sys related applications to their own tests/sys/ folder (#19566)
• treewide: replace occurrences of tests/driver_ with new path (#19555)
• tests/core: remove Makefile.sys_common copy past mistake (#19783)
• tests/drivers_at24cxxx: make it easier to select other EEPROMS (#19457)
• tests/lua_loader: move to tests/pkg/lua_loader (#19569)
• tests/periph_rtt: Fix for tick conversion test (#19522)
• tests/pkg/lvgl: avoid using floats (#19698)
• tests/unittests: remove old workaround for SAML1X and gcc9.X bug (#19687)
• tests: move leftover sys related tests to test/sys + move tests/sys/candev to tests/drivers (#19585)
• tests: move remaining driver related applications to tests/drivers (#19568)

And 65 minor changes.

Removals (6)

• makefiles/pseudomodules: remove deprecated event_thread_lowest module (#19627)
• nanocoap_sock: remove nanocoap_get() (#19553)
• pkg/tensorflow-lite: remove deprecated package (#19624)
• sys/gnrc_lorawan: remove deprecated tx port option (#19626)
• sys/hashes: remove deprecated aes cmac hashing (#19625)
• usbus: remove deprecated USBUS_HANDLER_FLAG_TR_FAIL flag (#19488)

Bug fixes (53)

• cpu/stm32/periph_adc: fixes and improvements for L4 support (#19571)
• all/gnrc: fix null pointer dereference (#19756)
• boards/esp32: small documentation fixes (#19810)
• boards/esp32s2-lilygo-ttgo-t8: fix display configuration (#19807)
• boards/iotlab-m3: enable l3g4200d_ng (#19523)
• boards/qn9080dk: fix periph conflict (#19730)
• boards/sipeed-longan-nano: fix TFT display config and documentation (#19793)
• boards/sipeed-longan-nano: revert default to variant with TFT (#19814)
• boards/z1: fix broken clock configuration (#19705)
• boards: fix documentation for GD32V boards (#19790)
• buildsystem: fix kconfig mismatches (#19813)
• core/lib: drop read only XFA's const volatile modifiers (#19544)
• core: fix null pointer dereference (#19757)
• cpu/cc26x0_cc13x0: Drop feature cortexm_mpu (#19507)
• cpu/esp32: define RAM_START_ADDR and RAM_LEN (#19763)
• cpu/esp8266: fix region overflow with '*periph' directory in app path (#19785)
• cpu/msp430: fix for ti's msp430-gcc-opensource package ld version (#19782)
• cpu/qn908x/periph_i2c: allow internal pull-up on SCL (#19729)
• cpu/stm32/periph_gpio: reset PU/PD for ADC channels (#19574)
• cpu/stm32/usbdev_fs: fix ep registration and EP_REG assignments (#19460)
• cpu/stm32: Fix periph_gpio_ll_irq (#19446)
• cpu/stm32: fix riotboot settings for L4 and WB (#19618)
• drivers/at86rf2xx: fix default page being ignored (#19467)
• drivers/dht: busy wait reimplementation (#19718)
• drivers/enc28j60: fix ISR routine and bth (#19461)
• drivers/hih6130: avoid using floats (#19695)
• drivers/periph_usbdev: fix set device address (#19471)
• drivers/servo: Fix missing dep (#19515)
• drivers/slipdev: fix logic bug (#19633)
• drivers/usbus_synopsys_dwc2: fix interrupt handling in DMA mode (#19459)
• gnrc/ipv6/nib: reset rs_sent counter also for not-6LN interfaces (#19747)
• gnrc_sixlowpan_frag_rb: fix OOB write in _rbuf_add (#19680)
• gnrc_sixlowpan_frag_sfr: fix ARQ scheduler race-condition (#19679)
• gnrc_sixlowpan_iphc: fix NULL pointer dereference (#19678)
• gnrc_sixlowpan_iphc: prefix bits outside context must be zero (#19649)
• ipv6/nib: 6LBR should not send RS on their downstream interface (#19335)
• makefiles/arch/riscv.inc.mk: speed up toolchain detection (#19791)
• makefiles/tools/serial.inc.mk: Handle new miniterm versions (#19444)
• nrf5x_common: Clear I2C periph shorts (#19735)
• pkg/openthread: set event callback before netdev init (#19547)
• sys/color: extend unittest and fix module (#19693)
• sys/net/rpl: fix missing assignment operator (#19749)
• sys/net/rpl: fix possible NULL dereference (#19611)
• sys/shell: fix missing generic lora settings in ifconfig (#19466)
• sys/usb/usbus_msc: fix typo in C expression (#19637)
• sys/usbus/msc: fix EP sizes for USB HS and buffer alignment in DMA- mode (#19458)
• sys/xtimer: improve documentation (#19681)
• tests/build_system/external_board_dirs: fix broken symlinks (#19584)
• tests/drivers/l3gxxxx: fix used sensor version for iotlab boards (#19550)
• tools/mspdebug: fix make debug and make debugserver (#19556)
• tools/openocd: Fix handling of OPENOCD_CMD_RESET_HALT (#19506)
• usbus/msc: fixes for synopsys dwc2 driver (#19455)
• usbus: don't trigger assertion in usbus_urb_submit() (#19664)

Known issues

Network related issues (51)

• 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)
• 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 handle fragmented IPv6 packets from Linux kernel (#12264)
• example/gnrc_border_router cannot answer after some time (#19578)
• 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)
• Global IPv6 addresses remain deprecated after receiving RA (#19846)
• 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_netif_pktq leaks memory (#17924)
• gnrc_rpl: missing bounds checks in _parse_options (#16085)
• gnrc_rpl: nib route not updated when topology / DODAG changes (#17327)
• gnrc_rpl: old routes are not deleted (#19423)
• gnrc_rpl: takes unusually long time to start routing packets (#19147)
• gnrc_sock_udp: Possible Race condition on copy in application buffer (#10389)
• gnrc_tcp: gnrc_tcp_recv() never generates -ECONNABORTED (#17896)
• gomach: Resetting netif with cli doesn't return (#10370)
• ieee802154_submac: IPv6 fragmentation broken (#16998)
• LoRaWan node ISR stack overflowed (#14962)
• LWIP TCP Communication Error (#19676)
• 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)
• Neighbor Discovery not working after router reboot when using SLAAC (#11038)
• 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)
• ping6 is failing when testing with cc2538dk (#13997)
• pkg/tinydtls: auxiliary data API does not work for async sockets (#16054)
• pkg/tinydtls: DTLS handshake does not work (#19595)
• samr30 xpro doesn't seem to use its radio ok (#12761)
• scan-build errors found during 2019.07 testing (#11852)
• stale border router does not get replaced (#12210)
• test/lwip: enabling both, IPv4 and IPv6, results in unexpected behavior (#18097)
• tests/lwip: does not compile for IPv4 on 6LoWPAN-based boards. (#17162)
• two nodes livelock sending neighbor solicitations back and forth between each other (#16670)
• xbee: setting PAN ID sometimes fails (#10338)

Timer related issues (7)

• 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)
• stm32_common/periph/rtc: current implementation broken/poor accuracy (#8746)
• sys/newlib: gettimeofday() returns time since boot, not current wall time. (#9187)

Drivers related issues (13)

• 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)
• drivers/st7735: faulty driver initialization (#19818)
• examples/dtls-wolfssl not working on pba-d-01-kw2x (#13527)
• fail to send data to can bus (#12371)
• 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)
• PWM: Single-phase initialization creates flicker (#15121)
• STM32: SPI clock not returning to idle state and generating additional clock cycles (#11104)
• TCP client cannot send read only data (#16541)
• tests/periph_flashpage: unexpected behavior on nucleo-l4r5zi (#17599)

Native related issues (4)

• examples/micropython: floating point exception while testing on native (#15870)
• native getchar is blocking RIOT (#16834)
• native not float safe (#495)
• native: tlsf: early malloc will lead to a crash (#5796)

Other platforms related issues (15)

• Failing tests on FE310 (Hifive1b) (#13086)
• [TRACKING] Fixes for automatic tests of ESP32 boards. (#12763)
• boards/hifive1: flashing issue (#13104)
• 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)
• examples/gnrc_border_router: esp_wifi_init failed with return value 257 on ESP32-C3 with nimble_rpble (#19319)
• gcoap/esp8266: Stack overflow with gcoap example (#13606)
• MPU doesn't work on cortex-m0+ (#14822)
• newlib-nano: Printf formatting does not work properly for some numeric types (#1891)
• 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)

Build system related issues (7)

• buildtest uses wrong build directory (#9742)
• Build dependencies - processing order issues (#9913)
• dist/tools/cppcheck/cppchck.sh: errors when running with Cppcheck 1.89 (#12771)
• EXTERNAL_MODULE_DIRS silently ignores non-existent entries (#17696)
• make: ccache leads to differing binaries (#14264)
• make: use of immediate value of variables before they have their final value (#8913)
• missing build dependencies in the rust build (#19714)

Other issues (64)

• [TRACKING] sys/shell refactoring. (#12105)
• [tracking] unnecessary use of floating point arithmetic (#19614)
• _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)
• at86rf215 stops receiving until sending a packet (#19653)
• b-l072z-lrwan1: tests/ztimer_overhead: test failure (#19224)
• backport_pr: Only works for when fork is in user (not in organization) (#18486)
• benchmark_udp: hammering with low interval causes issues (#16808)
• boards/esp32-wroom-32: tests/mtd_raw flakey (#16130)
• Builds fail when different execstack options are around in objects (#18522)
• Can't build relic with benchmarks or tests (#12897)
• CC2538-CC2592EM has a very weak transmit power (#17543)
• CC2538DK board docs: broken links (#12889)
• cpp: Exception handling undefined (#17523)
• cpu/stm32: some tests are failing on CM33 (l5, u5) (#17439)
• doc/boards: information concerning access to RIOT shell (#17453)
• doc/LOSTANDFOUND: not rendered as expected (#17063)
• edbg: long lines flooded over serial become garbled (#14548)
• examples / tests: LoRa tests fail on platforms that don't support LoRa (#14520)
• examples/gcoap: client broken (#19379)
• feather-m0: make flash reports "device unsupported" (#17722)
• flashing issue on frdm-k64f (#15903)
• frdm-k22f failing tests/periph_flashpage (#17057)
• frdm-k22f fails tests/periph_timer (#19543)
• Freeze into semtech_loramac_send call (pkg/semtech-loramac) (#18790)
• gcoap: gcoap_req_send and related should return negative for errors (#19393)
• gnrc_ipv6_nib: Neighbor Solicitation ping-pong (#18164)
• I2C not working under RIOT with U8G2 pkg (#16381)
• ieee802154_security: Nonce is reused after reboot (#16844)
• kconfiglib.py choice override of menuconfig bug (#19069)
• lwip: drivers/at86rf2xx/at86rf2xx_netdev.c invalid state during TCP disconnect (#17209)
• lwip: invalid state transition on ieee802154_submac users (#17208)
• Making the newlib thread-safe (#4488)
• mcuboot: flashes but no output (#17524)
• MTD is confusing (#17663)
• nanocoap: incomplete response to /.well-known/core request (#10731)
• Order of auto_init functions (#13541)
• periph_rtt: rtt_set_alarm() blocks IRQ for 80 plus usec on STM32 (#19520)
• pkg/tinydtls: Multiple issues (#16108)
• Potential race condition in compile_and_test_for_board.py (#12621)
• RIOT is saw-toothing in energy consumption (even when idling) (#5009)
• riotboot/nrf52840dk: flashing slot1 with JLINK fails (#14576)
• riotboot: ECC faults (eg. in STM32L5 or STM32WB) not handled gracefully (#17874)
• rust-gcoap example is incompatible with littlefs2 (#17817)
• samr34-xpro: some tests failing (#19223)
• sock_dtls: unable to send big messages (#17996)
• spurious IRQs in periph_timer (#18976)
• stdio_ethos: infinite shell loop (#17972)
• stdio_tinyusb_cdc_acm hangs with picolibc (#19277)
• STM32 Nucleo boards improperly clocked (#19778)
• sys/riotboot: documentation issues (#11243)
• tests/lwip target board for python test is hardcoded to native (#6533)
• tests/periph_flashpage: failing on stm32l475ve (#17280)
• tests/pkg_libhydrogen: test fails on master for the samr21-xpro with LLVM (#15066)
• tests/pkg_libschc: Failing test_reassemble_success_ack_always (#19445)
• 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)
• Types in byteorder.h need a cleanup (#14737)
• USB identifiers with funny characters create mojibake (#17776)
• usbus/msc: wrong error handling and behavior after usb reset (#19478)
• Use of multiple CAN bus on compatible boards (#14801)
• ztimer is incompatible with real-time requirements (#18883)

There are 161 known issues in this release

Fixed Issues since the last release (2023.04)

• Not able to flash binary on samr21-xpro boards choosing serial number (#19805)
• STM32F4-discovery + mrf24j40 not working (#19711)
• Deprecated documentation? (#19667)
• usbus_cdc_ecm: failed assertion when host reboots (#19663)
• Bug: _ep_to_sockaddr() does not update in6_addr->sin6_scope_id (#19486)
• SPI access in LoRa-e5 and im880b? (#19025)
• qn9080 I2C driver spins in endless loop (#19021)
• pkg_libhydrogen tests fail / update libhydrogen (#18508)
• [gcoap-dtls] Posting a message yields a stack overflow on the samr21-xpro with ECC (#18292)
• driver/sx126x:sx1268 spreading factor support LORA_SF5 (#17861)
• Bug: BUILD_IN_DOCKER=1 doesn't work when running make compile- commands (#17507)
• newlib-nano: Printf formatting does not work properly with "PRIu8" (#17083)
• cpu/stm32/periph/rtc overflow error (#16574)
• make -j flash fails due to missing make dependencies or make flash-only rebuilds the .elf (#16385)
• Basic test for periph/rtt introduced in #15431 is incorrect (#15940)
• Possible memory leak in RIOT/build/pkg/ndn-riot/app.c (#15638)
• build: info-build doesn't work with boards without port set (#15185)
• Two bugs may lead to NULL dereference. (#15006)
• tests/cpp11_*: failing on i-nucleo-lrwan1 (#14578)
• BUILD_IN_DOCKER ignores USEMODULE (#14504)
• adc is not a ADC-Driver but a analog pin abstraction (#14424)
• ethos: Unable to choose global source address. (#13745)
• Potential security and safety race conditions on attached devices (#13444)
• Cannot use LLVM with Cortex-M boards (#13390)
• Sleep mode for Arduino (#13321)
• Bug: openocd 0.10.0-6 Ubuntu dies while debugging with -rtos auto (#13285)
• Riot-os freezes with lwip + enc28j60 + stm32L4 (#13088)
• floats and doubles being used all over the place. (#12045)
• send data with UDP at 10HZ, the program die (#11860)
• Tracking: remove harmful use of export in make and immediate evaluation (#10850)
• sys/stdio_uart: dropped data when received at once (#10639)
• CC2538 RF overlapping PIN usage (#8779)
• doxygen: riot.css modified by 'make doc' (#8122)
• cpu/native: timer interrupt issue (#6442)
• macros: RIOT_FILE_RELATIVE printing wrong file name for headers (#4053)

35 fixed issues since last release (2023.04)

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

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.