gistfile1.js

var Promise = require('bluebird')
var Api = require('mikronode');
var colors = require('colors')
var con, api

var BluebirdMikrotik = function(a,debug){
 console.log(a)
 this.api = new Api(a.host,a.user,a.password);
}

BluebirdMikrotik.prototype.connect = function  () {
  var p = new Promise.defer();
  //console.log('intentando conexion')
  this.api.connect(function(c) {
    console.log(c)
    this.con=c
    console.log('.')
    console.log(this.con)
    p.resolve()
  })
  this.api.on('error',function  (e) {
    //console.log(e)
    p.reject(e)
  })
  return p.promise
}

BluebirdMikrotik.prototype.send = function(data){
  data  = data || 'data\n'
var p = new Promise.defer();
console.log(this.con)
var chan=this.con.openChannel();
    chan.write(data,function() {
      chan.on('trap',function(data) {
          // console.log('t');
          p.reject(data)
       });
       chan.on('done',function(data) {

          var parsed = Api.parseItems(data);
          console.log(parsed)
          chan.close();
          this.con.close();
          p.resolve(parsed)
       });
    });

return p.promise;

} 

module.exports = BluebirdMikrotik;
 // var MK = new BluebirdMikrotik({},true)
 // console.log(MK)
 // MK.connect()

here ends the module for mikrotik api I have a main app file in which I call this code inside of a function:

// console.log(config.mikrotik)
          mk = new bbmk(config.mikrotik)
          //console.log(mk)
          return mk.connect().bind(mk) //this was trying (has no effect)
          .then(function  () {
            // body...
          console.log('EEEEEEEEEEEEEEEE conectado')
          console.log(mk.con)  //this logs to undefined
          return mk.send(['/ip/hotspot/user/profile/getall']) //throws an error because con is undefined. 
          })