var ipp = require("ipp");
var Printer = ipp.Printer("http://printer.example.com:631/ipp/print");
var fs = require("fs");
var document;

fs.readFile("testfile.txt", function(err, data) {
  if (err) throw err;

  document = data;
});

var msg = {
  "operation-attributes-tag": {
    "requesting-user-name": "John Doe",
    "document-format": "text/plain"
  },
  data: document;
};

printer.execute("Print-Job", msg, function(err, res) {
        console.log(err);