ztimer_clock are meant to be chained. At the end of the chaine
there is always a timer device object (periph_rtt/rtc/timer).
Since ZTIMER_MSEC and ZTIMER_USEC can be the scaled/shifted with
respect to the base periph_rtt/rtc/timer it makes sense to chain
other ZTIMER_XXX on top of the base rtc/timer/rtt in order to avoid
chained convertions.
`od_hex_dump()` is called if `hdr_len < pkt->size` to print the rest
after `hdr_len` of `pkt`. So if we just leave `hdr_len = 0` instead of
calling `od_hex_dump()` for every other NETTYPE, we achieve the same
effect.
As it is more effective (and already done in some cases) to re-set
`hdr_len` when the header was printed, we initialize `hdr_len` first
with 0 now.
Instead of making a NETTYPE definition dependent on an implementation
module, this change makes it dependent on a pseudo-module for each
specific NETTYPE and makes the respective implementation modules
dependent on it.
This has two advantages:
- one does not need include the whole implementation module to
subscribe to a NETTYPE for testing or to provide an alternative
implementation
- A lot of circular dependencies related to GNRC could be untangled.
E.g. the only reason `gnrc_icmpv6` needs the `gnrc_ipv6` is because it
uses `GNRC_NETTYPE_IPV6` to search for the IPv6 header in an ICMPv6
when demultiplexing an ICMPv6 header.
This change does not resolve these dependencies or include usages where
needed. The only dependency change is the addition of the
pseudo-modules to the implementation modules.
This adds two functions `coap_payload_add()` and `coap_payload_advance()`.
- `coap_payload_add()` will add n bytes to the payload buffer and advance
payload pointer accordingly.
const char hello[] = "Hello CoAP!";
coap_payload_add(pkt, hello, sizeof(hello));
- `coap_payload_advance()` will advance the payload buffer after data
has been added to it.
int len = snprintf(pkt->payload, pkt->payload_len, "%s %s!", "Hello", "CoAP");
coap_payload_advance(pkt, len);
I considered adding an additional parameter to keep track of the total request size
(returned size from coap_opt_finish() incremented by each added payload fragment),
but decided against it to keep consistency with the existing API.
- pm_off() should prevent other threads from getting executed after it is
called, as it should turn off the MCU completely according to its doc
- Previously, the fallback implementation would still allow other threads
to continue working
- Simply disabling IRQs and never enabling them again should make sure
the MCU behaves like it would be completely off
- pm_off() should reduce the power consumption as much as possible
- Previously, when IRQs came after the call to pm_set_lowest() in the
fallback implementation of pm_off(), `while(1) {}` got executed at full
power consumption
- Just calling `pm_set(0);` in a loop while make sure that lowest power mode
is restored if the MCU wakes up again.
- The check if the lowest power mode is available is skipped, as no code
gets executed afterwards anyway
