The wifi.sta module connects if a loop is running?

问题

Im trying to detect when the module actually connects to my wifi AP, since .connect does not have a callback im doing something simple like this:

wifi.sta.config("SSID","password")
wifi.sta.connect()
tmr.delay(1000000)
i = 0
while(wifi.sta.status() ~= 5 and i < 10) do
  print("Waiting")
  print(wifi.sta.status())
  i = i + 1
  tmr.delay(1000000) 
end

But the output of .sta.status() is always 1 inside the loop. When it finish, if I send the command =wifi.sta.status() manually from the IDE it tells me 5. Why?

回答1:

Using tmr.delay doesnot let run the event loop, you should use a timer callback.

Then the code could be something like :

wifi.sta.config("SSID","password")
wifi.sta.connect()

i=0
tmr.alarm(1, 1000, 1, function()
    if (wifi.sta.status() ~= 5 and i < 10) then
       print("Status:"..wifi.sta.status())
       i = i + 1
    else
       tmr.stop(1)
       if (wifi.sta.status() == 5) then
          print("IP:"..wifi.sta.getip())
       else
          print("Status:"..wifi.sta.status())
       end
    end
end)

回答2:

If you use a recent dev firmware you can do something really event based :

wifi.setmode(wifi.STATION)
wifi.sta.config(SSID, PASSWORD)

function Success()
    tmr.stop(0)
    if (SERIAL_PRINT) then
        print("IP: " .. wifi.sta.getip())
    end
    wifi.sta.eventMonStop()
    wifi.sta.eventMonReg(wifi.STA_GOTIP, "unreg")
    dofile("mainProgram.lua")
end

function Failure()
    if (SERIAL_PRINT) then
        print("Unable to connect")
    end
    wifi.sta.eventMonStop()
    wifi.sta.eventMonReg(wifi.STA_GOTIP, "unreg")
    return 0
end

tmr.alarm(0,30000,0, function() Failure() end)
wifi.sta.connect()
wifi.sta.eventMonReg(wifi.STA_GOTIP, function() Success() end)
wifi.sta.eventMonStart()

EDIT: Please have a look to the documentation for a list of all events. If you wish to use this code, you'll have to handle the failure more cleanly.

来源：https://stackoverflow.com/questions/33288026/the-wifi-sta-module-connects-if-a-loop-is-running

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lua

esp8266

nodemcu