listener argument must be a function error

Question

I'm using nodejs for my rfid that is hook up on my raspberry pi. What I'm trying to do is when I tap the id "6f124628" the led won't turn on unless another pin on the arduino is high. I'm using firmata protocol for arduino communication.

JS:

function arduinoReady(err) {
  if (err) {
    console.log(err);
    return;
  }
  console.log('Firmware: ' + board.firmware.name +
    '-' + board.firmware.version.major +
    '.' + board.firmware.version.minor);

  var ledOn = true;
  board.pinMode(ledPin, board.MODES.OUTPUT);

  rc522(function(rfidSerialNumber) {

    console.log(rfidSerialNumber);
    if (rfidSerialNumber == "216264a9") {

      onjie.writeSync(1);

    }

    data = board.digitalRead(ledPin);
    if (rfidSerialNumber == "6f124628" && data == "board.HIGH") {

      LED1.writeSync(1);

      return;
    }
  });

But my code doesn't work and Typerror :

"listener" argument must be a function

var http = require('http').createServer(handler);
app.listen(8080);

function handler (req, res) {
  fs.readFile(__dirname + '/firmata.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading firmata.html');
    }
 
    res.writeHead(200);
    res.end(data);
  });
}

Answer 1

The problem is with the method createServer

You have to change the initialization of your method handler

Try changing the handler declaration to this:

var handler = function(req, res) {
  fs.readFile(__dirname + '/firmata.html',
  function (err, data) {
    if (err) {
      res.writeHead(500);
      return res.end('Error loading firmata.html');
    }

    res.writeHead(200);
    res.end(data);
  });
}  

And now, you're able to declare your server with:

var http = require('http').createServer(handler);