Finally - cheap WiFi?

Finally I got a first version up and running (at least in my environment) which

• initializes ESP8266
  
• connects to wireless
  
• gets IP adress
  
• reads html from a server
  

• listens to a port
  To get it running, you have to change mySSID and myPassWD in attached code.
  Give it some time, about 20 secs, and you should then get:
  >echo(0);
  =undefined
  init true
  connect:true
  getIP: true 192.168.1.2 IP in your network can be different
  readUrl: true Copyright.... source of servo.js
  ....
  ***} ***
  Simple test for listening is to open a browser and open "http://192.168.1.2:88?hugo=27
  then you should get a line :
  listen: /?hugo=27

  function ESP8266(s,bd,rx,tx){
  var sp = s, rdata = "", wText = "",cb,timr,command = "",me = this; 
  me.dbg = false;
  sp.setup(bd,{rx:rx,tx:tx});
  function sendCommandWaitFor(cmd,waitText,waitFor,­callback,skipCommand){
  var rdata = '', timr,scmd = 'AT+' + cmd + '\r',p;
  timr = setTimeout(function(){ 
    sp.removeAllListeners('data');
    callback(false,rdata); 
  },waitFor);
  sp.on('data',function(d){
    rdata += d;
    if(skipCommand){
      p = rdata.indexOf(scmd + '\r\n');
      if(p >= 0){
        rdata = rdata.substr(p + scmd.length + 2);
      }
    }
    if(rdata.indexOf(waitText) >=0){
      clearTimeout(timr);
      sp.removeAllListeners('data');
      callback(true,rdata);
    }
  });
  sp.print(scmd);
  }
  function sendCommandWait(cmd,waitFor,callback){
  sp.print('AT+' + cmd + '\r');
  setTimeout(function(){ callback(true,""); });
  }
  function connect(ssid,passwd,callback){
  sendCommandWait('CWMODE=1',1000,function­(f,d){
    sendCommandWaitFor('CWJAP="' + ssid + '","' +passwd + '"','OK',5000,function(f,d){
      setTimeout(function(){
        if(f){sendCommandWait('CIPMUX=0',1000,ca­llback);}
        else{callback(false,d);}
      },5000);
    });
  });
  }  
  function getIP(callback){
  sendCommandWaitFor("CIFSR","\r\n",2000,c­allback,true);
  }
  function init(callback){
  sendCommandWaitFor('RST','ready',5000,fu­nction(d,f){callback(d,f);});
  }
  function readUrl(host,adr,port,callback){
  var cmd,rdata,timr,p;
  sendCommandWaitFor('CIPSTART="TCP","' + host + '",' + port,'Linked',1000,
    function(f,d){
      if(f){
        cmd ='GET ' + adr + ' HTTP/1.0\r\nHost:' + host + '\r\n\r\n';
        sendCommandWaitFor('CIPSEND=' + cmd.length,'>',10000,function(f,d){
          timr = setTimeout(function(){
            sp.removeAllListeners('data');
            callback(false,rdata); 
          },10000);
          sp.on('data',function(d){
            rdata += d;
            p = rdata.indexOf("Unlink\r\n");
            if(p >= 0){
              sp.removeAllListeners('data');
              clearTimeout(timr);
              callback(f,extractData(rdata));
            }
          });
          sp.print(cmd);
        });
      }
  });
  }
  function extractData(d){
  var p,r = "",l;
  p = d.indexOf('+IPD,');
  while(p >= 0){
    d = d.substr(p + 5);
    p = d.indexOf(':');
    r += d.substr(p + 1,parseInt(d.substr(0,p),10));
    p = d.indexOf('+IPD,');
  }
  p = r.indexOf("Content-Length");
  l = parseInt(r.substr(p,r.substr(p).indexOf(­'\r\n')).split(":")[1],10);
  r = r.substr(r.length - l);
  return r;
  }
  function extractListen(d){
  var p,r = "";
  p = d.indexOf("+IPD,");
  if(p >= 0){
    r = d.substr(p).split(" ")[1];
  }
  return r;
  }
  function listen(port,handler){
  var rdata = "",p,q;
  sendCommandWait("CIPMUX=1",1000,function­(f,d){
    sendCommandWaitFor("CIPSERVER=1," + port,'OK',2000,function(d,f){
      if(d){
        sp.on('data',function(d){
          rdata += d;
          p = rdata.indexOf("\r\n");
          if(p >= 0){
            q = extractListen(rdata.substr(0,p));
            if(q !== ""){ handler(q);}
            rdata = rdata.substr(p + 2);
          }
        });
      }
    });
  });
  }
  me.connect = connect;
  me.getIP = getIP;
  me.init = init;
  me.readUrl = readUrl;
  me.listen = listen;
  }
  var esp = new ESP8266(Serial4,115200,C11,C10);
  var mySSID = "changeThis", myPassWD = "changeThis";
  esp.init(function(f,d){
  console.log("init",f);
  esp.connect(mySSID,myPassWD,function(f,d­){
  console.log("connect:",f);
  esp.getIP(function(d,f){
    console.log("getIP:",d,f);
    //esp.readUrl("192.168.1.3","/Espruino/t­est.htm",80,function(f,d){
    esp.readUrl("http://www.espruino.com","/­modules/servo.js",80,function(f,d){
    console.log("readUrl:",f,d);
      esp.listen(88,function(d){console.log("l­isten:",d);});
    });
  });
  });
  });