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A zero-length send is invalid with TCP, but well defined with UDP. udp:send"" was returning (nil,"refused"), indicating that it failed when the packet was actually sent. The test script reproduces the bug, and includes a tcpdump of the zero length packet being sent.
This provides the automated test scripts used to make sure the library
is working properly.
The files provided are:
testsrvr.lua -- test server
testclnt.lua -- test client
To run these tests, just run lua on the server and then on the client.
Good luck,
Diego.