Lua Unix Domain Socket : Send and Receive

-- Server code
libsocket = require "socket"
libunix = require "socket.unix"
socket = assert(libunix())
SOCKET="/tmp/socket"
assert(socket:bind(SOCKET))
assert(socket:listen())
conn = assert(socket:accept())
while 1 do
    data=assert(conn:receive())
    print("Got line: " .. data)
    conn:send("echo: " .. data .. "\n")
    if data == "." then conn:close() return end
end

-- Client code
socket = require"socket"
socket.unix = require"socket.unix"
c = assert(socket.unix())
assert(c:connect("/tmp/socket"))
c:send("123456\n")
-- data=assert(c:receive())
-- print("Got line: " .. data)