nc -u -l -p 8888
then send a couple
echo hi |nc -u -b hostname 8888
you will receive the first one but none after that (unless they are unicast) It seems nc switches to unicast mode after receiving the first one. Might be nice, but I want to continuously monitor broadcasts.
Suggestion: nc -u -b -l -p 8888
the -b in listen mode could mean never switch to unicast.