`tests/gnrc_udp` was specifically introduced for testing the release
specs. All of them ask the tester to check the packet buffer after the
test. So it makes sense to include the module that allows for that per
default for this test so the tester does not forget to include it ;-).
This patch is a reduced version of an earlier one, with the bare minimum
required to be able to run the test and get the release going.
Original description:
atoi() cannot detect errors. Many implementation return zero on error
and that is what was being checked here, making the "udp send" command
unable to parse integer values of zero. On top of this, the behavior on
errors does not seem to be specified in the standard (so it is not even
correct to check for zero even when zero is not an accepted value, like
for a port number).
The result of all this is that sending UDP packets of zero length (as
required by the Release Specs) was not possible.
This patch replaces atoi by strlen, which allows for robust error detection.
Sending zero length packets is possible.
Added arduino-nano to BOARD_INSUFFICIENT_MEMORY/BOARD_BLACKLIST following suit
of how arduino-uno is marked, as arduino-nano is mostly an Uno in a different
form factor.
The NIB's forwarding engine behaves more correctly than GNRC's old
forwarding engine in that link-local addresses require also an
interface to be provided to be meaningful. As with other commands this
is simplified for the special case that there only is one interface
that that interface is chosen.
