If you want to merely send one UDP packet with some specified data, as opposed to Satanicpuppy's answer which continuously sends random data, you can do:
echo "foo" | nc -w1 -u 111.22.333.4 20000
If you want to merely send one UDP packet with some specified data, as opposed to Satanicpuppy's answer which continuously sends random data, you can do:
echo "foo" | nc -w1 -u 111.22.333.4 20000