pthieu

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• `Error: Not connected to the internet` when invoking http.createServer

  @pthieu started

  • 7 comments
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  @julian replied
• `Error: Not connected to the internet` when invoking http.createServer

  in ESP8266 • 7 years, 5 months

  

  @julian: Yes, it will take some time for the network interface to establish a connection with the access point; the E.init will trigger immediately after a power cycle (or save() invocation).

  Change your code to this:

  var Wifi = require('Wifi');
  E.on("init", function () {
    Wifi.on('connected', function(){
      var http = require("http");
      http.createServer(function (req, res) {
      res.writeHead(200);
      res.end("Hello World");
      }).listen(8080);
    });
  });
  

  The doc for the Wifi class has a number of events that are emitted on specific situations that you can utilize to your advantage.

• `Error: Not connected to the internet` when invoking http.createServer

  in ESP8266 • 7 years, 5 months

  

  @Gordon:

  ESP8266 NodeMCU 1.0 (ESP-12E)

  Yes, the issue is the event-driven nature of JS. I was looking for a way to write simpler code since there isn't a reliable async or Promise flow control library to use; I'll have to work with flags then. Some questions:

  1. Do you know if http.createServer() returns a new instance with a listener every time it's invoked like node.js? Or is there code beneath the hood that will check for an existence of a http.Server object? I did a quick test to invoke http.createServer() twice in succession and there was no namespace conflicts or EADDRINUSE errors, nor did the callback trigger twice upon a POST to my ESP8266.

  2. Does the Wifi class trigger an event when it has connected to a network? Something like Wifi.on('connected', function(){...}) -- Nevermind, found the docs: http://www.espruino.com/Reference#t_l_Wi­fi_connected

  3. Is there a way to save a key/value pair to flash? (or just any variable)

• `Error: Not connected to the internet` when invoking http.createServer

  in ESP8266 • 7 years, 5 months

  

  Want to invoke http.createServer outside of connecting to a network or creating access point. But I get this error:

  Error: Not connected to the internet

  My code follows this logic in event loop:

  1. Start AP
     
  2. Try to connect to network
     
  3. Start web server
     
  4. Stop AP when successfully connected to a network
     
     

  i.e.

  E.on('init', function() {
      APCheck = enableWifiScan();
      startAP();
    // If we try to connect to wifi at the same time we scan, there will be
    // conflicts and scan will return nothing
    setTimeout(function() {
      connectToWifi(); // If successful, stops AP
    }, 2000);
  
    // Create server anyway as we'll allow for control of the MCU through AP
    // if it has not connected to a network
    http.createServer(getPage).listen(80);
  });
  

  The reason for this is I want to be able to have the MCU serve a configuration page which will allow user to configure the network to connect to, making the device portable without hardcoding a network.

  I could probably start the server after access point has been created, add a check to see if a server has been instantiated after connecting to a network, but wondering if there's an easier way.