In order to properly handle an observe cancellation of a client, the server has to keep track of the notification MIDs (to be able to match an RST to a notification), see [RFC7641, 3.6 Cancellation](https://www.rfc-editor.org/rfc/rfc7641.html#section-3.6) for mor details. An alternative to this would be to make either the client send an explicit observe deregister request, or make the server send the next notification via CON (which hten allows matching of the RST due to the CON state).
20003: coap: create typedef for CoAP methods r=benpicco a=benpicco
20028: nanocoap: fix incorrect uses of coap_get_code() r=benpicco a=benpicco
20036: boards/nucleo-l4r5zi : add PWM configuration r=benpicco a=krzysztof-cabaj
### Contribution description
This PR adds to the Nucleo-l4r5zi PWM configuration
### Testing procedure
Flash the board using `tests/periph/pwm` program. Check if you could, for example, change LED
intensity using PWM.
### Issues/PRs references
None.
20041: pkg/littlefs2: bump to v2.8.1 r=benpicco a=bergzand
### Contribution description
Minor version number bump.
### Testing procedure
- Check if I copied the correct commit hash.
- Run the tests.
### Issues/PRs references
None
Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Co-authored-by: krzysztof-cabaj <kcabaj@gmail.com>
Co-authored-by: Koen Zandberg <koen@bergzand.net>
Router Advertisements are enabled automatically for routing nodes
as soon as they obtain a prefix (e.g. via DHCPv6, UHCP, …).
Enabling router advertisements without a prefix to advertise is
wrong and causes no router solicitations to be send on an upstream
interface.
Also from https://www.rfc-editor.org/rfc/rfc4861#section-6.2.1
Note that AdvSendAdvertisements MUST be FALSE by
default so that a node will not accidentally start
acting as a router unless it is explicitly
configured by system management to send Router
Advertisements.
19876: sys/net/ipv4/addr: fix typos r=benpicco a=Enoch247
### Contribution description
This patch fixes some typos in the doxygen doc.
### Testing procedure
Nothing to test. No change to code.
### Issues/PRs references
- None known
19878: makefiles/usb_board_reset.mk: declare term-delay target with test target r=benpicco a=aabadie
19888: boards/sltb009a: complete and fix documentation r=benpicco a=gschorcht
### Contribution description
This PR completes and fixes the documentation which was still in the state as generated automatically by `efm2riot`.
The PR also includes a fix of the configuration of the second UART device that was find out while completing the documentation.
### Testing procedure
Green CI
### Issues/PRs references
Co-authored-by: Joshua DeWeese <jdeweese@primecontrols.com>
Co-authored-by: Alexandre Abadie <alexandre.abadie@inria.fr>
Co-authored-by: Gunar Schorcht <gunar@schorcht.net>
