恐慌：调用 Lua API 时发生未受保护的错误（标准输入：8：尝试调用全局 'run'（零值））

Question

使用来自 https://github.com/nodemcu/nodemcu-firmware 运行以下代码的 NodeMCU：

ssid = "www.mydomain.com"
pass = "234234234432"


gpio.write(0, gpio.LOW)

print("Startup up wifi mode")

wifi.setmode(wifi.STATION)
wifi.sta.config(ssid, pass)

wifi.sta.autoconnect(1)
wifi.sta.connect()


tmr.alarm(3, 1000, 1, function() 
    if (wifi.sta.status() < 5) then
        print("Connecting...")        
    else 
        tmr.stop(3)
        print("Connected having IP "..wifi.sta.getip())
        gpio.write(0, gpio.HIGH)        
        run()      
    end
end)

gpio.write(0, gpio.HIGH)




function run() 
    print("run")

    myhost="www.adafruit.com"
    mypage="testwifi/index.html"
    myip=""

    sk=net.createConnection(net.TCP, 0)
    sk:dns(myhost,function(conn,ip) 
    myip=ip
    sk=net.createConnection(net.TCP, 0)
    sk:on("receive", function(sck, c) print(c) end )
    sk:connect(80,myip)
    sk:send("GET / " .. mypage .." HTTP/1.1\r\nHost: " .. myhost .."\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
    sk=nil


end

我收到这个错误：

PANIC: unprotected error in call to Lua API (stdin:8: attempt to call global 'run' (a nil value))
����m������!������!�1���
Waiting answer from ESP - Timeout reached. Command aborted.

我该如何解决？

Answer 1

请记住，NodeMCU/Lua 是完全异步的，函数需要在调用之前定义。

function start()
  tmr.alarm(3, 1000, 1, function() 
      if (wifi.sta.status() < 5) then
          print("Connecting...")        
      else 
          tmr.stop(3)
          print("Connected having IP "..wifi.sta.getip())
          gpio.write(0, gpio.HIGH)        
          run()      
      end
  end)

  gpio.write(0, gpio.HIGH)
end

function run() 
    print("run")

    myhost="www.adafruit.com"
    mypage="testwifi/index.html"
    myip=""

    sk=net.createConnection(net.TCP, 0)
    sk:dns(myhost,function(conn,ip) 
    myip=ip
    sk=net.createConnection(net.TCP, 0)
    sk:on("receive", function(sck, c) print(c) end )
    sk:connect(80,myip)
    sk:send("GET / " .. mypage .." HTTP/1.1\r\nHost: " .. myhost .."\r\nConnection: keep-alive\r\nAccept: */*\r\n\r\n")
    sk=nil
end

start()

此外，请考虑如果您的设备在成功连接后 断开与 WiFi 的连接会发生什么情况。您停止了计时器...

恐慌：调用 Lua API 时发生未受保护的错误（标准输入：8：尝试调用全局 'run'（零值））

PANIC: unprotected error in call to Lua API (stdin:8: attempt to call global 'run' (a nil value))

lua

wifi

esp8266

nodemcu