ESP8266 Community Forum

- Sun Jun 12, 2016 3:42 pm #49081 I have a simple web server that returns the temperature from a DS18B20 temperature sensor but every time I request the temperature the heap goes down until it crashes

If I make a single page server it doesn't seem to go down...

Here's my code

Code: Select alllocal temperature
local t=require("ds18b20")
t.setup(5)
addrs=t.addrs()

function srvReceive(client, request)
    local buf = "HTTP/1.1 200 OK\r\nContent-Type: text/json\r\n\r\n"
   
    if string.find(request, "/ ") then
        Sendfile(client, "ds18b20.html")
    elseif (string.find(request, "/temperature ")) then
        client:send(buf .. t.read(addrs[1],t.F))
        client:close()
    elseif string.find(request, "/info ") then
        buf = buf .. "{ \"description\":\""..device_location.."\",\"type\":\"ds18b20\" }"
        client:send(buf)
        client:close()
    else
        Sendfile(client, "404.html")
    end
    request = nil
    buf = nil
    collectgarbage()
end
function srvListen(conn)
    conn:on("receive", srvReceive)
end
if srv ~= nil then
    node.restart()
end

print("Setting up mdns")
mdns.register("nodemcu"..node.chipid(), { description=device_location, service="nodemcu", port=80, type="ds18b20", chipid=node.chipid() })

print("Setting up webserver")
dofile("sendfile.lua")
srv = nil
srv=net.createServer(net.TCP)
srv:listen(80,srvListen)

- Wed Jun 22, 2016 5:59 am #49589 I suggest you look at the elaborate example at http://nodemcu.readthedocs.io/en/dev/en ... socketsend as for how to avoid memory leaks.

https://frightanic.com/
https://nodemcu-build.com/
https://github.com/marcelstoer/nodemcu-pyflasher