>dump()
function Chrono() {
  this.reset();
}
Chrono.prototype.reset = function () {
  this.nleaps=0;
  this.duration=0;
  this.notMeasuredStart=getTime();
  this.durationNotMeasured=0;
};
Chrono.prototype.start = function () {
  this.startTime= getTime();
  this.durationNotMeasured+=this.startTime-this.notMeasuredStart;
};
Chrono.prototype.leap = function () {
  this.nleaps++;
};
Chrono.prototype.stop = function () {
  this.notMeasuredStart=getTime();
  this.duration+=this.notMeasuredStart-this.startTime;
};
Chrono.prototype.meanLeap = function () {
  return this.duration/this.nleaps;
};
Chrono.prototype.info = function () {
  console.log( this.nleaps+" leaps (mean time "+this.meanLeap()+" s). Measured duration/Total duration "+(100*this.duration/(this.duration+this.durationNotMeasured)).toFixed(2)+"%");
};
Chrono.prototype.toString = function () {
  return "Chronometer analysed "+this.nleaps+" leaps with a duration of "+this.duration+" (mean leap time "+this.meanLeap()+" s). Measured time/Total time "+(100*this.duration/(this.duration+this.durationNotMeasured)).toFixed(2)+"%";
};
function nmea_checksum(s) {
  try {
    var n=s.split('$').pop(); // remove leading uncomplete sentences AND the no more usefull leading $
    n=n.split('*'); // separate checksum from line
    var cksum = parseInt(n.pop(),16); // make checksum a number and remove it from n
    n=n.pop(); // keep content alone
    if (cksum===cks7(n)) // mean leap 0.02532994300 s
      return n.split(',');  // mean leap 0.01426320198 s
    else {
      throw "different checksums "+cks7.toString(16)+" versus "+cks7(n).toString(16)+" in line "+s ;
    }
  } catch(x) {
    throw "Checksum error "+x+' in sentence '+s;
  }
}
function start_stop_nmea(serial,nmea_msg_list,keep_serial,keep_usb) {  // so GLL, ZDA etc...
  if (nmea_msg_list===undefined) return;
  serial.print(0xff); // force wake up of the module
    console.log('Now stopping the GPS from sending the following messages ');
  var timeout= setTimeout(function (s, lst, ks, ku) {
    var msg_pref="PUBX,40,";
    var msg_suff=((ks) ? "1" : "0")+",0,0,"+((ku) ? "1" : "0")+",0,0";
    for (var i in lst) {
      var m=lst[i];
      if (m.length===5)
        m=m.substr(2,3);
      else // special case for PUBX
        m=m.substr(4,2);
      m=msg_pref+m+","+msg_suff;
      m="$"+m+"*"+("0"+(cks7(m)).toString(16)).substr(-2).toUpperCase();
      console.log((ks ? 'Starting' : 'Stopping' ),lst[i],'nmea sentence send by ublox gps with', m);
      s.println(m);
    }
  }, 500, serial, nmea_msg_list, keep_serial, keep_usb); // send command after half a second to allow for module wakeup
}
var fieldsOfInterest = [
  "latitude",
  "longitude",
  "hhmmss.ss",
  "ddmmyy",
  "mslAlt",
  "sogKn",
  "status",
  "std_lat",
  "std_long",
  "std_alt"
 ];
function codeFieldOfInterest(n) {
  var c="this['"+n.field+"']=";
  var i=n.position;
  switch(n.field) {
    case  'latitude' :
      return c+"lln(d["+i+"],d["+(i+1)+"],'S')";
    case  'longitude' :
      return c+"lln(d["+i+"],d["+(i+1)+"],'E')";
    case  'ddmmyy' :
      return c+"ddmmyy(d["+i+"])";
    case  'hhmmss.ss' :
      return c+"secn(d["+i+"])";
    case 'status' :
    case 'NavStat':
    case 'Valid':
      return c+"d["+i+"]";
    default:
      return c+"Number(d["+i+"])";
  }
}
function posFieldsOfInterest(p,c,i) {
 try {
   if (fieldsOfInterest.indexOf(c)>=0) {
     try {
       p.push({ field: c, position: i});
     } catch (e) {
       console.log(e);
       console.log(p,c,i);
     }
   }
  } catch(x) { console.log(x); }
  return p;
}
function getFieldsPos(n) {
          this[n.field]=n.position;
}
function parseHandlers(handling,serial,fieldsOfInterest) {
  var handlers = {};
  handlers.serial=serial;
  var discarded=[];
  var fieldsFoundInNMEA=[];
  for (var k in handling) {
    var template=handling[k].split(',');
    if (template[0]==="PUBX") { // special case: we have to add to s[1] field
      template[0]=template[0]+template[1];
      template[1]="NumUBX";
    }
    if (handlers[template[0]]) {
      console.log("ERROR Handler of "+handling[k][0]+" defined twice with sumindex "+template[0]+"...");
    }
    else { // now extract particular fields of interest
      var posi=template.reduce(posFieldsOfInterest ,[]);
      if (posi.length>0) {
        // now note which field is found in which nmea sentence and at which position by field order
        //var fieldsFoundInTemplate={};
        //posi.forEach(getFieldsPos ,fieldsFoundInTemplate);
        posi=posi.map(codeFieldOfInterest).join(';');
        handlers[template[0]]= eval("(function(d) {"+posi+"})"); // function to handle just what we need
        console.log('Handler of '+template[0]+' defined as '+handlers[template[0]]);
      } else
        discarded.push(template[0]);
    }
  }
  // now we now we have just the messages containing pertinent data
  // however, we could have redundant messages and need to identify them all
  var retained=[]; // so far nithing retained
  start_stop_nmea(serial,discarded,0,1);
  return handlers;
}
function estimate_dist(lat1,long1,lat2,long2) {
  var R=6378137.0;
  var dera = Math.PI/180.0;
  var x = dera*(lat2-lat1) * Math.cos(dera*(long1+long2)/2);
  var y = dera*(long2-long1);
  return Math.sqrt(x*x + y*y) * R;
}
var tfTimeout = 2;
function tf(d) {
  console.log('Received a TimeFix event with parameter '+d);
  gps.epoch=gps.ddmmyy+gps['hhmmss.ss']*1000;
  var deltat=getTime()*1000-gps.epoch;
  if ((deltat<0-1000) || (deltat>1000)) {
    setTime(gps.epoch/1000); // Now setup system time to gps time (there is a lag)
    console.log('Internal clock set to gps time '+new Date().toString()+' with a delta time of '+deltat+' ms');
  } else {
    console.log('Internal clock was only '+deltat+' ms from GPS epoch '+new Date(gps.epoch).toString()+' so no changes were made.');
  }
  // Remove this listener for some time, say 1 hour
  gps.removeAllListeners('TimeFix');
  tfTimeout=setTimeout(function (){
    gps.on('TimeFix',tf);  // reconnect after on hour
  },3600000);
}
function connect(serial,handling,chrono) { // replace with next line for module
// exports.connect = function(serial, handling) {
  var gps = parseHandlers(handling,serial);
  gps.line="";
  gps.enabled=true;
  gps.log=false;
  gps.debug=false;
  gps.chrono=chrono;
  gps.lagTime = 0;
  gps.status="?";
  gps['hhmmss.ss']=NaN;
  // user callback for gps position fix
  gps.on('GPSFix', function(d){
    console.log("We have a GPS position fix!");
  });
  // user callback for gps data received and analysed
  gps.on('gpsdata', function(d) {
    try {
      gps.lagTime=getTime()-d;
      if (gps.log) {
        console.log('Data received from GPS, receive treatement ended at '+d+" and user's treatement starting after ",gps.lagTime+' s');
      }
    } catch(x) {
      console.log(x);
    }
  });
  gps.on('TimeFix',tf);
  serial.on('data', function(data) {
    if (gps.enabled) {
      gps.chrono.start();
      var sots = false;
      var noTimeFix= isNaN(gps['hhmmss.ss']);
      var noPosFix= (gps.status!=="A");
      gps.line += data;
      var idx = gps.line.indexOf("\n");
      while (idx>=0) {
        var line = gps.line.substr(0, idx);
        gps.line = gps.line.substr(idx+1);
        if (gps.log) console.log("Handling:"+line);
        try {
          var n=nmea_checksum(line);
          gps[n[0] + ((n[0]==="PUBX") ? n[1] : "")](n);
          sots = true;
          if (noTimeFix != isNaN(gps['hhmmss.ss'])) {
            console.log('Time fix from serial at '+getTime());
            gps.emit('TimeFix',n);
            noTimeFix= isNaN(gps['hhmmss.ss']);
          }
          if (noPosFix != (gps.status!=="A")) {
            console.log('GPS position fix from serial at '+getTime());
            gps.emit('GPSFix',n);
            noPosFix= (gps.status!=="A");
          }
          gps.chrono.leap();
        } catch(x) {
          if (gps.debug) console.log("Failed "+x+" to handle:"+line);
          //throw x;
        }
        idx = gps.line.indexOf("\n");
      }
      if (sots) { gps.emit('gpsdata',getTime()); }
      gps.chrono.stop();
    } else { gps.line=""; }
  });
  return gps;
}
var gps = {
  "serial": Serial4,
  "GPGGA": function (d) {this['hhmmss.ss']=secn(d[1]);this['latitude']=lln(d[2],d[3],'S');this['longitude']=lln(d[4],d[5],'E');this['mslAlt']=Number(d[9])},
  "GPRMC": function (d) {this['hhmmss.ss']=secn(d[1]);this['status']=d[2];this['latitude']=lln(d[3],d[4],'S');this['longitude']=lln(d[5],d[6],'E');this['sogKn']=Number(d[7]);this['ddmmyy']=ddmmyy(d[9])},
  "GPGBS": function (d) {this['hhmmss.ss']=secn(d[1]);this['std_lat']=Number(d[2]);this['std_alt']=Number(d[4])},
  "line": "",
  "enabled": true, "log": true, "debug": false,
  "chrono": { "nleaps": 76114, "duration": 1404.92071819305, "notMeasuredStart": 1442595816.00444412231, "durationNotMeasured": 24096.32186126708,
    "startTime": 1442595815.99214839935 },
  "lagTime": 0.04415130615,
  "status": "V",
  "hhmmss.ss": 61374.04,
  "#onGPSFix": function (d) {
    console.log("We have a GPS position fix!");
  },
  "#ongpsdata": function (d) {
    try {
      gps.lagTime=getTime()-d;
      if (gps.log) {
        console.log('Data received from GPS, receive treatement ended at '+d+" and user's treatement starting after ",gps.lagTime+' s');
      }
    } catch(x) {
      console.log(x);
    }
  },
  "latitude": NaN, "longitude": NaN, "sogKn": 0, "ddmmyy": 1442534400000, "mslAlt": 0,
  "std_lat": 0, "std_alt": 0, "epoch": 1442570315000,
  "#onTimeFix": function (d) {
  console.log('Received a TimeFix event with parameter '+d);
  gps.epoch=gps.ddmmyy+gps['hhmmss.ss']*1000;
  var deltat=getTime()*1000-gps.epoch;
  if ((deltat<0-1000) || (deltat>1000)) {
    setTime(gps.epoch/1000); // Now setup system time to gps time (there is a lag)
    console.log('Internal clock set to gps time '+new Date().toString()+' with a delta time of '+deltat+' ms');
  } else {
    console.log('Internal clock was only '+deltat+' ms from GPS epoch '+new Date(gps.epoch).toString()+' so no changes were made.');
  }
  // Remove this listener for some time, say 1 hour
  gps.removeAllListeners('TimeFix');
  tfTimeout=setTimeout(function (){
    gps.on('TimeFix',tf);  // reconnect after on hour
  },3600000);
}
 };
var seconds = 240;
var i = "JSON";
var myInterval = 3;
function show(d) {
      for (var i in d) print(i+" : "+E.getSizeOf(d[i]))
    }
setInterval(function () {
  if (process.memory().free<500) debugger;
}, 10000);
setDeepSleep(1);
Serial4.on('data', function (data) {
    if (gps.enabled) {
      gps.chrono.start();
      var sots = false;
      var noTimeFix= isNaN(gps['hhmmss.ss']);
      var noPosFix= (gps.status!=="A");
      gps.line += data;
      var idx = gps.line.indexOf("\n");
      while (idx>=0) {
        var line = gps.line.substr(0, idx);
        gps.line = gps.line.substr(idx+1);
        if (gps.log) console.log("Handling:"+line);
        try {
          var n=nmea_checksum(line);
          gps[n[0] + ((n[0]==="PUBX") ? n[1] : "")](n);
          sots = true;
          if (noTimeFix != isNaN(gps['hhmmss.ss'])) {
            console.log('Time fix from serial at '+getTime());
            gps.emit('TimeFix',n);
            noTimeFix= isNaN(gps['hhmmss.ss']);
          }
          if (noPosFix != (gps.status!=="A")) {
            console.log('GPS position fix from serial at '+getTime());
            gps.emit('GPSFix',n);
            noPosFix= (gps.status!=="A");
          }
          gps.chrono.leap();
        } catch(x) {
          if (gps.debug) console.log("Failed "+x+" to handle:"+line);
          //throw x;
        }
        idx = gps.line.indexOf("\n");
      }
      if (sots) { gps.emit('gpsdata',getTime()); }
      gps.chrono.stop();
    } else { gps.line=""; }
  });
Serial4.setup(115200, {"tx":C10,"rx":C11});
pinMode(C11,"input_pullup");
=undefined