Tessel Wifi & Network Test

tessel-wifi-network-test.js

// Tessel Wifi & Network Test
// Author: Daniel Christopher <[email protected]>
// Public Domain
//
// 1- Attempt to connect to Internet, retry as necessary
// 2- Make an HTTP GET
//
// Combines Tessel [wifi examples](http://start.tessel.io/wifi)


// Wifi Access
var network  = '#####'; // put in your network name here
var netpass  = '#####'; // put in your password here, or leave blank ('') for unsecured
var security = 'wpa2';  // other options are 'wep', 'wpa', or 'unsecured'


// Tessel Firmware
var wifi   = require('wifi-cc3000');

// Node built-in
var http = require('http');

// References
var timeouts = 0;
var power_cycles = 0;
var connection_attempts = 0;


function connect(){
  // Only make connection attempt when necessary
  if (!wifi.isConnected()){
    console.log("\nAttempt to Connect, #" + (++connection_attempts));

    wifi.connect({
      security : security,
      ssid     : network,
      password : netpass,
      timeout  : 24 // seconds
    });

    // wait an additional few seconds because the wifi chip does not appear to
    // to be abiding by the timeout set in the wifi object
    delay(10000);
  }else{
    console.log("\nAlready Connected!\n");
  }
}


// Initial attempt
connect();


// wifi event-handler registration
wifi.on('connect', function(data){
  console.log("Wifi connected", data);

  // reset on success
  connection_attempts = 0;

  // http://httpstat.us/ is a service for generating HTTP codes
  // Here, make request to see if Tessel is online
  var statusCode = 200;

  http.get("http://httpstat.us/" + statusCode, function (res) {
    var buffer = [];

    // response callback
    res.on('data', function (data) {
      // success
      buffer.push(new Buffer(data));
      console.log('Received: ', new Buffer(data).toString());
      return;
    });

  }).on('error', function (e) {
    console.log("HTTP Error: ");
    console.log(e.message);
    return;
  });

  // Terminate
  return;
});

wifi.on('disconnect', function(data){
  console.log("Wifi disconnected", data);

  // reset and reconnect
  powerCycle();
})


wifi.on('timeout', function(err){
  // tried to connect but couldn't, retry
  console.log("Wifi time out, #" + (++timeouts));

  if (timeouts > 2) {
    // reset the wifi chip
    powerCycle();
  } else {
    // try to reconnect
    connect();
  }
});


wifi.on('error', function(err){
  // one of the following happened
  // 1. tried to disconnect while not connected
  // 2. tried to disconnect while in the middle of trying to connect
  // 3. tried to initialize a connection without first waiting for a timeout or a disconnect
  console.log("error emitted", err);

  // do not give up
  powerCycle();
  
  // ...unless we've tried 10+ times
  // See Troubleshooting section
  if(power_cycles > 10){
    console.log(err);
    console.log("\n More than 10 failed attempts.");
    console.log("See Troubleshooting section.");
    return;
  }
});

// reset the wifi chip progammatically
function powerCycle(){
  // when wifi chip resets, it tries to reconnect to the last saved network
  console.log("\nPower cycling, #" + (++power_cycles));

  wifi.reset(function(){
    console.log("Power cycling complete\n");
    timeouts = 0; // reset timeouts

    // wait for a bit
    delay(10000);

    // attempt to connect if necessary
    if (!wifi.isConnected()){ connect(); }
  });
}


// - lite version of [ErikDubbelboer's sleep](github.com/ErikDubbelboer/node-sleep)
function delay(ms) { var e = new Date().getTime() + (ms); while (new Date().getTime() <= e) {; }; }




// Troubleshooting Wifi
// --------------------
//
// Check to see if Tessel is connected to wifi using Tessel CLI, `tessel wifi -l`.
// If there is no IP address, the Tessel is not connected to Wifi.
//
// Try power cycling your Tessel and then run the tessel wifi connection command again.
//
// Remove saved wifi profiles => `tessel stop; tessel wifi -d`
//
// Move closer to the router.
//
// Reset the router.
//
// Make sure the router has b/g mode enabled and isn't using channels 12, 13, or 14.
//
// https://github.com/tessel/t1-docs/blob/master/wifi.md#connecting-to-wifi-from-js