NodeMCU:负责创建服务器的代码在构建新固件后停止工作

时间:2017-05-27 22:02:12

标签: lua nodemcu

由于我已将0.9.6-dev_20150704版本的固件(使用https://nodemcu-build.com/和pyflasher)更新为更新版本,如下所示:

NodeMCU custom build by frightanic.com  
branch: master  
commit: c8ac5cfb912ff206b03dd7c60ffbb2dafb83fe5e  
SSL: false  
modules: file,gpio,net,node,rtcmem,rtctime,tmr,uart,wifi  
build   built on: 2017-05-27 13:10  
powered by Lua 5.1.4 on SDK 2.1.0(116b762)  

以下代码(来自http://nodemcu.com/index_en.html的示例)已停止工作:

print(wifi.sta.getip())
--nil
wifi.setmode(wifi.STATION)
wifi.sta.config("SSID","password")
print(wifi.sta.getip())
--192.168.18.110

-- a simple http server
srv=net.createServer(net.TCP) 
srv:listen(80,function(conn) 
    conn:on("receive",function(conn,payload) 
    print(payload) 
    conn:send("<h1> Hello, NodeMcu.</h1>")
    end) 
end)

要清楚,似乎连接工作(因为我在路由器上的列表中看到MCU),但是当我在浏览器中键入相应的MCU地址时,它无法连接到服务器。你有任何想法如何解决它?

1 个答案:

答案 0 :(得分:2)

  

以下代码(来自http://nodemcu.com/index_en.html的示例)已停止工作:

您的代码示例未在该页面上列出。你将两个单独的例子拼凑成一个单独的程序,然后失败了。这部分是因为其中一个例子不再有用了。

问题就在这里:

Severity    Code    Description Project File    Line    Suppression State
Error       One or more projects are incompatible with .NETStandard,Version=v1.5.               
Error       Project Api is not compatible with netstandard1.5 (.NETStandard,Version=v1.5). Project Api supports: net462 (.NETFramework,Version=v4.6.2)  

它表明wifi.sta.config是一个同步操作,阻止设备从接入点获取IP地址。事实并非如此,因此,当下一行执行时,设备获得了IP,这几乎是不可能的。如果您检查串行控制台,可能会在那里看到wifi.sta.config("SSID","password") print(wifi.sta.getip()) --192.168.18.110

更糟糕的是,当nil运行时仍然没有IP。因此,服务器套接字不受任何限制,您创建了一个僵尸服务器。

这里的主要信息:等到设备获得IP并继续。我们曾经有一个漂亮的simple template in our documentation,但为了完整起见,它最近更新了:https://nodemcu.readthedocs.io/en/latest/en/upload/#initlua。对于初学者来说,它可能会被剥夺:

net.createServer

此外,如果您要从浏览器进行测试,您的服务器应该发送正确的HTTP标头。像这样:

-- load credentials, 'SSID' and 'PASSWORD' declared and initialize in there
dofile("credentials.lua")

function startup()
  if file.open("init.lua") == nil then
    print("init.lua deleted or renamed")
  else
    print("Running")
    file.close("init.lua")
    -- the actual application is stored in 'application.lua'
    -- dofile("application.lua")
  end
end

-- Define WiFi station event callbacks
wifi_got_ip_event = function(T)
  -- Note: Having an IP address does not mean there is internet access!
  -- Internet connectivity can be determined with net.dns.resolve().
  print("Wifi connection is ready! IP address is: " .. T.IP)
  print("Startup will resume momentarily, you have 3 seconds to abort.")
  print("Waiting...")
  tmr.create():alarm(3000, tmr.ALARM_SINGLE, startup)
end



-- Register WiFi Station event callbacks
wifi.eventmon.register(wifi.eventmon.STA_GOT_IP, wifi_got_ip_event)

print("Connecting to WiFi access point...")
wifi.setmode(wifi.STATION)
wifi.sta.config({ ssid = SSID, pwd = PASSWORD, save = true })
-- wifi.sta.connect() not necessary because config() uses auto-connect=true by default