Question

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

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

我收到了这个错误：

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.

如何解决此问题？

Answer 1

请记住，NodeMCU / Lua完全异步，并且需要在调用之前定义函数。

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连接成功后失去与的连接，会发生什么情况。你停止了计时器......

PANIC：调用Lua API时出现无保护错误（stdin：8：尝试调用global＆＃39; run＆＃39;（零值））

1 个答案: