luasocket 之 udp

http://blog.chinaunix.net/uid-27194309-id-3499261.html  在页面的后面有

先在路由器上执行:

opkg install luasocket_2.0.2-3_ar71xx.ipk

udp server 例程如下:

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-- upd-server Test
local socket = require  "socket"

local port = 8080
local udp = socket.udp()
udp:settimeout(0)
udp:setsockname('*', port)    --server

local data, msg_or_ip, port_or_nil
local running =  true

-- the beginning of the loop proper...
print "Beginning server loop."
while running  do
    data, msg_or_ip, port_or_nil = udp:receivefrom()
    if data then
            print("udp:receivefrom: " .. data  .. msg_or_ip, port_or_nil)
            udp:sendto(data, msg_or_ip, port_or_nil)

            if data  == "quit" then
                running =  false
            end
    elseif msg_or_ip  ~= 'timeout' then
        error("Unknown network error: "..tostring(msg))
    end

    socket.sleep(0.01)
end

print "Thank you."

udp client 例程如下:

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-- upd-client Test
local socket = require  "socket"

local address =  "192.168.1.224"
local port = 8080
local udp = socket.udp()

udp:settimeout(0)
udp:setpeername(address, port)
--udp:sendto("udp-test", address, port)
udp:send("udp-test0n")
udp:send("udp-test1n")
udp:send("udp-test2n")

print "Thank you."

用udp实现更方便的调试

-- luasocket upd-client Test
local socket = require  "socket"

debug = 1
function DEBUGP(str)
    if debug == 1 then
        local server_ip =  "192.168.1.224"
        local server_port = 8080
        local udp = socket.udp()

        udp:settimeout(0)
        udp:setpeername(server_ip, server_port)
        --udp:sendto("udp-test", address, port)
        udp:send(str)
        udp:close()

    elseif debug  == 2 then
        print(str)
    end
end

local data1 = 101
local data2 = 102
local data3 = 103
DEBUGP("test - " .. data1  .. "n")
DEBUGP("test - " .. data2  .. "n")
DEBUGP("test - " .. data3  .. "n")

print "Thank you."