When the default router was removed or could not be added, `dr` will
be NULL.
In this case, don't cease sending router solicitations - we still don't
have a default router.
dhcpv6_client_prefix_valid_until returned the valid timestamp
this fixes it according to the documentation given in
/sys/include/net/dhcpv6/client.h
to return seconds left
Consider the following: A node tries to forward a packet to another
host for which it does not know the route yet. It assumes it to be
on-link and starts a neighbor solicitation, putting the node address
in the destinatio cache.
Later the route is known (via a second hop) but the host is still in
the NIB.
The result is that gnrc_ipv6_nib_get_next_hop_l2addr() ends up in the
"nib: %s is in NC or on-link, start address resolution" case and does
not attempt to resolve the route.
This results in the host remaining unreachable even though now a route
is present.
Prefix delegation used to be the only supported feature of our DHCPv6
client, but by now it also supports MUD, DNS recursive name servers and
IA_NA is on the horizon. So it makes sense to make IA_PD an optional
module like all those other features are as well.
The `udp` command is a valuable debugging tool that is also useful
outside of the gnrc_networking example.
To enable easy sending of udp messages in other applications during
development, move the `udp` command to the shell module and introduce
the `gnrc_udp_cmd` pseudo-module to enable it.
This commit implements uplink redundancy in GNRC LoRaWAN. Uplink
redundancy is used to retransmit unconfirmed uplink frames. The
retransmission stops when either a downlink message is received or the
number of uplink retransmissions is reached.
This functionality doesn't affect confirmed uplinks.
If a node has two interfaces A with 2001:16b8:45b5:9af8:5884:3bff:fe4f:a903
and B with 2001:16b8:45b5:9afa:5884:3bff:fe4f:a902 and receives a neighbor
solicitation on A for an address configured on interface B, answer the neighbor
solicitation instead of bailing out with
> Target address 2001:16b8:45b5:9afa:5884:3bff:fe4f:a902 is not assigned
> to the local interface
Make gnrc_netif_create() block until the interface is created and
registered.
This avoids a race condition where after calling gnrc_netif_init_devs()
not all interfaces are available yet when iterating through the list
of interfaces with gnrc_netif_iter().
A lot of things break if `GNRC_NETIF_FLAGS_HAS_L2ADDR` is not set.
In order to handle router advertisements and auto-configureation,
generate a faux l2 address based on the netdev ID.
This option was unused before, honor it to make it possible to start
with router advertisements disabled and enable them at run time.
The defaults remain unchanged by that.
