Rollerblind项目问题：Wifi tmr.alarm

Question

我正在尝试构建此项目：https://www.instructables.com/id/Motorized-WiFi-IKEA-Roller-Blind/

遇到了一些问题，现在仍然可以...这是我的wifi_setup.lau

-- file: setup.lua
local module = {}

config = {}
config.SSID = {}
config.SSID["ssid"] = "password"

function wifi_wait_ip()
  if wifi.sta.getip() == nil then
    print("IP unavailable, Waiting...")
  else
    tmr.stop(1)
    print("\n====================================")
    print("ESP8266 mode is: " .. wifi.getmode())
    print("MAC address is: " .. wifi.ap.getmac())
    print("IP is " .. wifi.sta.getip())
    print("====================================")
  end
end

function wifi_start(list_aps)
  if list_aps then
    for key, value in pairs(list_aps) do
      if config.SSID and config.SSID[key] then
        wifi.setmode(wifi.STATION);
        wifi.sta.config{ssid=key, pwd=config.SSID[key]}
        --wifi.sta.connect()
        print("Connecting to " .. key .. " ...")
        tmr.alarm(1, 2500, 1, wifi_wait_ip)
      end
    end
  else
    print("Error getting AP list")
  end
end

function module.start()  
  print("Configuring Wifi ...")
  wifi.setmode(wifi.STATION);
  wifi.sta.getap(wifi_start)
end

return module

但这是输出：

Configuring Wifi ...
> Connecting to ssid ...
PANIC: unprotected error in call to Lua API (wifi_setup.lua:29: attempt to call field 'alarm' (a nil value))

因此-String出现任何问题

我该怎么办？

Answer 1

谢谢你的提示。我认为我设法纠正了这个问题。对于其他需要它的人-我希望我编码正确-这里是解决方案：

`{    -- file: setup.lua
local module = {}
config = {}
config.SSID = {}
config.SSID["ssid"] = "password"

-- create a timer object
local tObj = tmr.create()
-- register an alarm


function wifi_wait_ip()
  if wifi.sta.getip() == nil then
    print("IP unavailable, Waiting...")
  else
    --tmr.stop(1)
    tObj:unregister()
    print("\n====================================")
    print("ESP8266 mode is: " .. wifi.getmode())
    print("MAC address is: " .. wifi.ap.getmac())
    print("IP is " .. wifi.sta.getip())
    print("====================================")
  end
end

function wifi_start(list_aps)
  if list_aps then
    for key, value in pairs(list_aps) do
      if config.SSID and config.SSID[key] then
        wifi.setmode(wifi.STATION);
        wifi.sta.config{ssid=key, pwd=config.SSID[key]}
       --wifi.sta.connect()
        print("Connecting to " .. key .. " ...")
       --tmr.create(1, 2500, 1, wifi_wait_ip)
        tObj:alarm(2000, tmr.ALARM_AUTO, wifi_wait_ip)
      end
    end
  else
    print("Error getting AP list")
  end
end

function module.start()  
  print("Configuring Wifi ...")
  wifi.setmode(wifi.STATION);
  wifi.sta.getap(wifi_start)
end

return module`