local str Lua echo server opening os date while str and str and str do

local str = "Lua echo server opening / " .. os.date("%T")

while str and str ~= "" and str ~= "\r" do
	io.write(str, "\r\n")
	io.flush()
	str = io.read()
end

io.write("Lua echo server closing / " .. os.date("%T"), "\r\n")