kohala % ./udpcli01 192.3.4.5 echo
hi there
socket timeout
and hello
socket timeout
kohala % ./udpcli01  gemini.tuc.noao.edu echo
hello, world
ICMP error: dest = 140.252.4.54.7, Connection refused, type = 3, code = 3
kohala % ./udpcli01 192.3.4.5 echo           
hello
ICMP error: dest = 192.3.4.5.7, No route to host, type = 3, code = 1