diff --git a/utils/auxiliary_functions.py b/utils/auxiliary_functions.py
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+++ b/utils/auxiliary_functions.py
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+# -*- coding: utf-8 -*-
+
+##
+# Copyright 2015 Telefónica Investigación y Desarrollo, S.A.U.
+# This file is part of openmano
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# For those usages not covered by the Apache License, Version 2.0 please
+# contact with: nfvlabs@tid.es
+##
+
+'''
+auxiliary_functions is a module that implements functions that are used by all openmano modules,
+dealing with aspects such as reading/writing files, formatting inputs/outputs for quick translation
+from dictionaries to appropriate database dictionaries, etc.
+'''
+__author__="Alfonso Tierno, Gerardo Garcia"
+__date__ ="$08-sep-2014 12:21:22$"
+
+import datetime
+from jsonschema import validate as js_v, exceptions as js_e
+#from bs4 import BeautifulSoup
+
+def read_file(file_to_read):
+    """Reads a file specified by 'file_to_read' and returns (True,<its content as a string>) in case of success or (False, <error message>) in case of failure"""
+    try:
+        f = open(file_to_read, 'r')
+        read_data = f.read()
+        f.close()
+    except Exception,e:
+        return (False, str(e))
+      
+    return (True, read_data)
+
+def write_file(file_to_write, text):
+    """Write a file specified by 'file_to_write' and returns (True,NOne) in case of success or (False, <error message>) in case of failure"""
+    try:
+        f = open(file_to_write, 'w')
+        f.write(text)
+        f.close()
+    except Exception,e:
+        return (False, str(e))
+      
+    return (True, None)
+
+def format_in(http_response, schema):
+    try:
+        client_data = http_response.json()
+        js_v(client_data, schema)
+        #print "Input data: ", str(client_data)
+        return True, client_data
+    except js_e.ValidationError, exc:
+        print "validate_in error, jsonschema exception ", exc.message, "at", exc.path
+        return False, ("validate_in error, jsonschema exception ", exc.message, "at", exc.path)
+
+def remove_extra_items(data, schema):
+    deleted=[]
+    if type(data) is tuple or type(data) is list:
+        for d in data:
+            a= remove_extra_items(d, schema['items'])
+            if a is not None: deleted.append(a)
+    elif type(data) is dict:
+        #TODO deal with patternProperties
+        if 'properties' not in schema:
+            return None
+        for k in data.keys():
+            if k not in schema['properties'].keys():
+                del data[k]
+                deleted.append(k)
+            else:
+                a = remove_extra_items(data[k], schema['properties'][k])
+                if a is not None:  deleted.append({k:a})
+    if len(deleted) == 0: return None
+    elif len(deleted) == 1: return deleted[0]
+    else: return deleted
+
+#def format_html2text(http_content):
+#    soup=BeautifulSoup(http_content)
+#    text = soup.p.get_text() + " " + soup.pre.get_text()
+#    return text
+
+
+def convert_bandwidth(data, reverse=False):
+    '''Check the field bandwidth recursivelly and when found, it removes units and convert to number 
+    It assumes that bandwidth is well formed
+    Attributes:
+        'data': dictionary bottle.FormsDict variable to be checked. None or empty is consideted valid
+        'reverse': by default convert form str to int (Mbps), if True it convert from number to units
+    Return:
+        None
+    '''
+    if type(data) is dict:
+        for k in data.keys():
+            if type(data[k]) is dict or type(data[k]) is tuple or type(data[k]) is list:
+                convert_bandwidth(data[k], reverse)
+        if "bandwidth" in data:
+            try:
+                value=str(data["bandwidth"])
+                if not reverse:
+                    pos = value.find("bps")
+                    if pos>0:
+                        if value[pos-1]=="G": data["bandwidth"] =  int(data["bandwidth"][:pos-1]) * 1000
+                        elif value[pos-1]=="k": data["bandwidth"]= int(data["bandwidth"][:pos-1]) / 1000
+                        else: data["bandwidth"]= int(data["bandwidth"][:pos-1])
+                else:
+                    value = int(data["bandwidth"])
+                    if value % 1000 == 0: data["bandwidth"]=str(value/1000) + " Gbps"
+                    else: data["bandwidth"]=str(value) + " Mbps"
+            except:
+                print "convert_bandwidth exception for type", type(data["bandwidth"]), " data", data["bandwidth"]
+                return
+    if type(data) is tuple or type(data) is list:
+        for k in data:
+            if type(k) is dict or type(k) is tuple or type(k) is list:
+                convert_bandwidth(k, reverse)
+
+
+
+def convert_datetime2str(var):
+    '''Converts a datetime variable to a string with the format '%Y-%m-%dT%H:%i:%s'
+    It enters recursively in the dict var finding this kind of variables
+    '''
+    if type(var) is dict:
+        for k,v in var.items():
+            if type(v) is datetime.datetime:
+                var[k]= v.strftime('%Y-%m-%dT%H:%M:%S')
+            elif type(v) is dict or type(v) is list or type(v) is tuple: 
+                convert_datetime2str(v)
+        if len(var) == 0: return True
+    elif type(var) is list or type(var) is tuple:
+        for v in var:
+            convert_datetime2str(v)
+
+def convert_str2boolean(data, items):
+    '''Check recursively the content of data, and if there is an key contained in items, convert value from string to boolean 
+    Done recursively
+    Attributes:
+        'data': dictionary variable to be checked. None or empty is considered valid
+        'items': tuple of keys to convert
+    Return:
+        None
+    '''
+    if type(data) is dict:
+        for k in data.keys():
+            if type(data[k]) is dict or type(data[k]) is tuple or type(data[k]) is list:
+                convert_str2boolean(data[k], items)
+            if k in items:
+                if type(data[k]) is str:
+                    if   data[k]=="false" or data[k]=="False": data[k]=False
+                    elif data[k]=="true"  or data[k]=="True":  data[k]=True
+    if type(data) is tuple or type(data) is list:
+        for k in data:
+            if type(k) is dict or type(k) is tuple or type(k) is list:
+                convert_str2boolean(k, items)
+
+def check_valid_uuid(uuid):
+    id_schema = {"type" : "string", "pattern": "^[a-fA-F0-9]{8}(-[a-fA-F0-9]{4}){3}-[a-fA-F0-9]{12}$"}
+    try:
+        js_v(uuid, id_schema)
+        return True
+    except js_e.ValidationError:
+        return False
+