gistfile1.js

// I have app.js where I have this code somewhere

//an array of modems I read from udev, in this case 2 modems
mod = [ { DEVNAME: '/dev/ttyUSB3',
    ID_MODEL: 'E398 LTE/UMTS/GSM Modem/Networkcard' },
  { DEVNAME: '/dev/ttyUSB0',
    ID_MODEL: 'E173s 3G broadband stick (modem on)' } ]

//then I do 
mod.forEach(function  (dev) {
  modeminit(dev);
})

//modeminit function looks like this
function modeminit (mo) {
var c = config
c.serial = {}
c.serial.port = mo.DEVNAME
var mod = modems[mo.DEVNAME] = new modem(c);

mod.openSerial()



// and in modem.js
var Modem = function  (conf) {
this.config = conf;   
}

Modem.prototype.openSerial =  function(){
  l(this.config.serial.port+' opening \n\n'.yellow)//l returns console.log(arg)
  this.s = new serial(this.config.serial.port);
var m = this;
  this.s.serialPort.on('open',function (d) {

  l('opened '.yellow + m.config.serial.port)

})
}



//the output on this is 

/dev/ttyUSB3 opening 
/dev/ttyUSB0 opening 
opened /dev/ttyUSB0
opened /dev/ttyUSB0