什么原因导致我的 NodeMCU 程序耗尽了内存？

请问有人可以告诉我为什么我的程序会耗尽内存吗？我正在使用 Lua 5.1.4 以及 SDK 1.5.4.1 的 NodeMCU。这是我的代码：

wifi.setmode(wifi.STATION)

wifi.sta.config("asdf","xxx")

elWiFi =(wifi.sta.getip())
if elWiFi ~= nil then
    print(wifi.sta.getip())
end

if srv~=nil then
    srv:close()
end

srv=net.createServer(net.TCP)
if srv ~= nil then
    srv:listen(6969,function(conn)
        if conn ~= nil then
        conn:on("receive",function(sck,numbers)
        if numbers ~= nil then
            collectgarbage("collect")
            p = string.find(numbers, "x=") --parses TCP string
            q = string.find(numbers, "&y")
            if p ~= nill then
                if q ~=  nil then
                    x = (string.sub(numbers,p+2, q-1))
                    print("x=" .. x )       -- prints x value
                end
            end --p ~= nill
            p = string.find(numbers, "y=")
            q = string.find(numbers, "&z")
            if p ~= nil then
                if q ~=  nil then
                    y = (string.sub(numbers,p+2, q-1))
                    print("y=" .. y)          --prints y value
                end
            end --p ~= nill
            p = string.find(numbers, "z=")
            q = string.find(numbers, " H")
            if p ~= nill then
                if q ~=  nil then
                    z = (string.sub(numbers,p+2, q-1))
                    --print("z=" .. z)
                end
            end-- p ~= nill
        end --numbers ~= nil
        conn:close()
        --conn = nil

        print(collectgarbage("count")*1024)
        collectgarbage("collect")
        --print(collectgarbage("count")*1024)

        --conn:send("test\n")

        end)
        end
    end)

end

我在每次解析 x 和 y 之前和之后打印 Heap 内存。它会随着时间的推移增加，并最终崩溃。

以下是输出内容：

x=-0.003997802734375
y=-0.0095672607421875
6744
6744
x=-0.0029449462890625
y=-0.0099945068359375
7133
7098
.
.
.
x=-0.003662109375
y=-0.00982666015625
35309
35275
x=-0.00311279296875
y=-0.0097503662109375
35424
35389
E:M 64
PANIC: unprotected error in call to Lua API (not enough memory)

 ets Jan  8 2013,rst cause:2, boot mode:(3,7)

load 0x40100000, len 25936, room 16
tail 0
chksum 0x5b
load 0x3ffe8000, len 2268, room 8
tail 4
chksum 0xe4
load 0x3ffe88dc, len 8, room 4
tail 4
chksum 0xd9
csum 0xd9
„ã　ì　ƒNì’r‚òn|ä　d　dld`　„ãrÛ$Œ　ò　„　　ìdà

NodeMCU custom build by frightanic.com
 branch: master
 commit: 7b83bbb2ea134cd85ac9d63108603cc02c4e20f7
 SSL: false
 modules: adc,file,gpio,net,node,ow,pwm,spi,struct,tmr,uart,websocket,wifi
 build  built on: 2016-11-15 00:43
 powered by Lua 5.1.4 on SDK 1.5.4.1(39cb9a32)
> x=-0.003997802734375

然后它会重新启动。感谢您提前的帮助。