diff --git a/osmclient/common/package_tool.py b/osmclient/common/package_tool.py
index 5b56265..1d7f57f 100644
--- a/osmclient/common/package_tool.py
+++ b/osmclient/common/package_tool.py
@@ -149,8 +149,8 @@
             descriptors_paths = [
                 f for f in glob.glob(base_directory + "/*.yaml", recursive=recursive)
             ]
-        print("Base directory: {}".format(base_directory))
-        print("{} Descriptors found to validate".format(len(descriptors_paths)))
+        self._logger.info("Base directory: {}".format(base_directory))
+        self._logger.info("{} Descriptors found to validate".format(len(descriptors_paths)))
         for desc_path in descriptors_paths:
             with open(desc_path) as descriptor_file:
                 descriptor_data = descriptor_file.read()
@@ -159,17 +159,18 @@
                 desc_type, descriptor_data = validation_im.yaml_validation(
                     self, descriptor_data
                 )
+                self._logger.debug(f"Validate {desc_type} {descriptor_data}")
                 if not old_format:
                     if desc_type == "vnfd" or desc_type == "nsd":
-                        print(
+                        self._logger.error(
                             "OSM descriptor '{}' written in an unsupported format. Please update to ETSI SOL006 format".format(
                                 desc_path
                             )
                         )
-                        print(
+                        self._logger.warning(
                             "Package validation skipped. It can still be done with 'osm package-validate --old'"
                         )
-                        print(
+                        self._logger.warning(
                             "Package build can still be done with 'osm package-build --skip-validation'"
                         )
                         raise Exception("Not SOL006 format")
@@ -186,6 +187,7 @@
                         "error": str(e),
                     }
                 )
+            self._logger.debug(table[-1])
         return table
 
     def translate(self, base_directory, recursive=True, dryrun=False):
diff --git a/osmclient/sol005/osmrepo.py b/osmclient/sol005/osmrepo.py
index 424865c..3568e8c 100644
--- a/osmclient/sol005/osmrepo.py
+++ b/osmclient/sol005/osmrepo.py
@@ -92,10 +92,11 @@
                         "repository in url {} unreachable".format(repository.get("url"))
                     )
             except Exception as e:
-                logging.error(
+                self._logger.error(
                     "Error cannot read from repository {} '{}': {}".format(
                         repository["name"], repository["url"], e
-                    )
+                    ),
+                    exc_info=True
                 )
                 continue
 
@@ -170,40 +171,52 @@
         :param origin: origin directory for getting all the artifacts
         :param destination: destination folder for create and index the valid artifacts
         """
-        self._logger.debug("")
+        self._logger.debug("Starting index composition")
         if destination == ".":
             if origin == destination:
                 destination = "repository"
 
         destination = abspath(destination)
         origin = abspath(origin)
-
+        self._logger.debug(f"Paths {destination}, {origin}")
         if origin[0] != "/":
             origin = join(getcwd(), origin)
         if destination[0] != "/":
             destination = join(getcwd(), destination)
 
         self.init_directory(destination)
-        artifacts = [f for f in listdir(origin) if isfile(join(origin, f))]
-        directories = [f for f in listdir(origin) if isdir(join(origin, f))]
+        artifacts = []
+        directories = []
+        for f in listdir(origin):
+            if isfile(join(origin, f)) and f.endswith('.tar.gz'):
+                artifacts.append(f)
+            elif isdir(join(origin, f)) and f != destination.split('/')[-1] and not f.startswith('.'):
+                directories.append(f)  # TODO: Document that nested directories are not supported
+            else:
+                self._logger.debug(f"Ignoring {f}")
         for artifact in artifacts:
             self.register_artifact_in_repository(
-                join(origin, artifact), destination, source="file"
+                join(origin, artifact), destination, source="artifact"
             )
         for artifact in directories:
             self.register_artifact_in_repository(
                 join(origin, artifact), destination, source="directory"
             )
-        print("\nFinal Results: ")
-        print(
+        self._logger.info("\nFinal Results: ")
+        self._logger.info(
             "VNF Packages Indexed: "
             + str(len(glob.glob(destination + "/vnf/*/*/metadata.yaml")))
         )
-        print(
+        self._logger.info(
             "NS Packages Indexed: "
             + str(len(glob.glob(destination + "/ns/*/*/metadata.yaml")))
         )
 
+        self._logger.info(
+            "NST Packages Indexed: "
+            + str(len(glob.glob(destination + "/nst/*/*/metadata.yaml")))
+        )
+
     def md5(self, fname):
         """
         Checksum generator
@@ -222,45 +235,81 @@
         From an artifact descriptor, obtain the fields required for indexing
         :param descriptor_dict: artifact description
         :param file: artifact package
-        :param package_type: type of artifact (vnf or ns)
+        :param package_type: type of artifact (vnf, ns, nst)
         :return: fields
         """
         self._logger.debug("")
+
         fields = {}
         base_path = "/{}/".format(package_type)
         aux_dict = {}
         if package_type == "vnf":
             if descriptor_dict.get("vnfd-catalog", False):
                 aux_dict = descriptor_dict.get("vnfd-catalog", {}).get("vnfd", [{}])[0]
+            elif descriptor_dict.get("vnfd:vnfd-catalog"):
+                aux_dict = descriptor_dict.get("vnfd:vnfd-catalog", {}).get("vnfd", [{}])[0]
+            elif descriptor_dict.get("vnfd"):
+                aux_dict = descriptor_dict["vnfd"]
+                if aux_dict.get("vnfd"):
+                    aux_dict = aux_dict['vnfd'][0]
             else:
-                aux_dict = descriptor_dict.get("vnfd:vnfd-catalog", {}).get(
-                    "vnfd", [{}]
-                )[0]
-
+                msg = f"Unexpected descriptor format {descriptor_dict}"
+                self._logger.error(msg)
+                raise ValueError(msg)
+            self._logger.debug(f"Extracted descriptor info for {package_type}: {aux_dict}")
             images = []
-            for vdu in aux_dict.get("vdu", ()):
-                images.append(vdu.get("image"))
+            for vdu in aux_dict.get("vdu", aux_dict.get('kdu', ())):
+                images.append(vdu.get("image", vdu.get('name')))
             fields["images"] = images
-        if package_type == "ns":
+        elif package_type == "ns":
             if descriptor_dict.get("nsd-catalog", False):
                 aux_dict = descriptor_dict.get("nsd-catalog", {}).get("nsd", [{}])[0]
+            elif descriptor_dict.get("nsd:nsd-catalog"):
+                aux_dict = descriptor_dict.get("nsd:nsd-catalog", {}).get("nsd", [{}])[0]
+            elif descriptor_dict.get("nsd"):
+                aux_dict = descriptor_dict['nsd']
+                if aux_dict.get("nsd"):
+                    aux_dict = descriptor_dict["nsd"]["nsd"][0]
             else:
-                aux_dict = descriptor_dict.get("nsd:nsd-catalog", {}).get("nsd", [{}])[
-                    0
-                ]
-
+                msg = f"Unexpected descriptor format {descriptor_dict}"
+                self._logger.error(msg)
+                raise ValueError(msg)
             vnfs = []
-
-            for vnf in aux_dict.get("constituent-vnfd", ()):
-                vnfs.append(vnf.get("vnfd-id-ref"))
+            if aux_dict.get("constituent-vnfd"):
+                for vnf in aux_dict.get("constituent-vnfd", ()):
+                    vnfs.append(vnf.get("vnfd-id-ref"))
+            else:
+                vnfs = aux_dict.get('vnfd-id')
             self._logger.debug("Used VNFS in the NSD: " + str(vnfs))
             fields["vnfd-id-ref"] = vnfs
+        elif package_type == 'nst':
+            if descriptor_dict.get("nst-catalog", False):
+                aux_dict = descriptor_dict.get("nst-catalog", {}).get("nst", [{}])[0]
+            elif descriptor_dict.get("nst:nst-catalog"):
+                aux_dict = descriptor_dict.get("nst:nst-catalog", {}).get("nst", [{}])[0]
+            elif descriptor_dict.get("nst"):
+                aux_dict = descriptor_dict['nst']
+                if aux_dict.get("nst"):
+                    aux_dict = descriptor_dict["nst"]["nst"][0]
+            nsds = []
+            for nsd in aux_dict.get("netslice-subnet", ()):
+                nsds.append(nsd.get("nsd-ref"))
+            self._logger.debug("Used NSDs in the NST: " + str(nsds))
+            if not nsds:
+                msg = f"Unexpected descriptor format {descriptor_dict}"
+                self._logger.error(msg)
+                raise ValueError(msg)
+            fields["nsd-id-ref"] = nsds
+        else:
+            msg = f"Unexpected descriptor format {descriptor_dict}"
+            self._logger.error(msg)
+            raise ValueError(msg)
 
         fields["name"] = aux_dict.get("name")
         fields["id"] = aux_dict.get("id")
         fields["description"] = aux_dict.get("description")
         fields["vendor"] = aux_dict.get("vendor")
-        fields["version"] = aux_dict.get("version", "1.0")
+        fields["version"] = str(aux_dict.get("version", "1.0"))
         fields["path"] = "{}{}/{}/{}-{}.tar.gz".format(
             base_path,
             fields["id"],
@@ -292,9 +341,10 @@
         """
         Validation of artifact.
         :param path: file path
+        :param source: flag to select the correct file type (directory or artifact)
         :return: status details, status, fields, package_type
         """
-        self._logger.debug("")
+        self._logger.debug(f"Validating {path} {source}")
         package_type = ""
         folder = ""
         try:
@@ -307,18 +357,28 @@
 
             with open(descriptor_file, "r") as f:
                 descriptor_data = f.read()
+            self._logger.debug(f"Descriptor data: {descriptor_data}")
             validation = validation_im()
             desc_type, descriptor_dict = validation.yaml_validation(descriptor_data)
-            validation_im.pyangbind_validation(self, desc_type, descriptor_dict)
-            if "vnf" in list(descriptor_dict.keys())[0]:
+            try:
+                validation_im.pyangbind_validation(self, desc_type, descriptor_dict)
+            except Exception as e:
+                self._logger.error(e, exc_info=True)
+                raise e
+            descriptor_type_ref = list(descriptor_dict.keys())[0].lower()
+            if "vnf" in descriptor_type_ref:
                 package_type = "vnf"
-            else:
-                # raise ClientException("Not VNF package")
+            elif "nst" in descriptor_type_ref:
+                package_type = "nst"
+            elif "ns" in descriptor_type_ref:
                 package_type = "ns"
-
+            else:
+                msg = f"Unknown package type {descriptor_type_ref}"
+                self._logger.error(msg)
+                raise ValueError(msg)
             self._logger.debug("Descriptor: {}".format(descriptor_dict))
             fields = self.fields_building(descriptor_dict, path, package_type)
-            self._logger.debug("Descriptor sucessfully validated")
+            self._logger.debug(f"Descriptor successfully validated {fields}")
             return (
                 {
                     "detail": "{}D successfully validated".format(package_type.upper()),
@@ -338,12 +398,13 @@
     def register_artifact_in_repository(self, path, destination, source):
         """
         Registration of one artifact in a repository
-        file: VNF or NS
-        destination: path for index creation
+        param path:
+        param destination: path for index creation
+        param source:
         """
         self._logger.debug("")
         pt = PackageTool()
-        compresed = False
+        compressed = False
         try:
             fields = {}
             _, valid, fields, package_type = self.validate_artifact(path, source)
@@ -354,7 +415,8 @@
             else:
                 if source == "directory":
                     path = pt.build(path)
-                    compresed = True
+                    self._logger.debug(f"Directory path {path}")
+                    compressed = True
                 fields["checksum"] = self.md5(path)
                 self.indexation(destination, path, package_type, fields)
 
@@ -365,7 +427,7 @@
             raise ClientException(e)
 
         finally:
-            if source == "directory" and compresed:
+            if source == "directory" and compressed:
                 remove(path)
 
     def indexation(self, destination, path, package_type, fields):
@@ -373,17 +435,18 @@
         Process for index packages
         :param destination: index repository path
         :param path: path of the package
-        :param package_type: package type (vnf, ns)
+        :param package_type: package type (vnf, ns, nst)
         :param fields: dict with the required values
         """
-        self._logger.debug("")
+        self._logger.debug(f"Processing {destination} {path} {package_type} {fields}")
+
         data_ind = {
             "name": fields.get("name"),
             "description": fields.get("description"),
             "vendor": fields.get("vendor"),
             "path": fields.get("path"),
         }
-
+        self._logger.debug(data_ind)
         final_path = join(
             destination, package_type, fields.get("id"), fields.get("version")
         )
@@ -473,7 +536,7 @@
                 "{} {} added in the repository".format(package_type.upper(), str(path))
             )
 
-    def current_datatime(self):
+    def current_datetime(self):
         """
         Datetime Generator
         :return: Datetime as string with the following structure "2020-04-29T08:41:07.681653Z"
@@ -493,11 +556,13 @@
         if not isfile(join(destination, "index.yaml")):
             mkdir(join(destination, "vnf"))
             mkdir(join(destination, "ns"))
+            mkdir(join(destination, "nst"))
             index_data = {
                 "apiVersion": "v1",
-                "generated": self.current_datatime(),
+                "generated": self.current_datetime(),
                 "vnf_packages": {},
                 "ns_packages": {},
+                "nst_packages": {},
             }
             with open(join(destination, "index.yaml"), "w") as outfile:
                 yaml.safe_dump(
diff --git a/osmclient/sol005/tests/test_osmrepo.py b/osmclient/sol005/tests/test_osmrepo.py
new file mode 100644
index 0000000..f337ae9
--- /dev/null
+++ b/osmclient/sol005/tests/test_osmrepo.py
@@ -0,0 +1,33 @@
+# Copyright 2021 ATOS.
+#
+# 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.
+
+import unittest
+import shutil
+from pathlib import Path
+
+from osmclient.sol005.osmrepo import OSMRepo
+
+
+class TestOSMRepo(unittest.TestCase):
+    def setUp(self):
+        self.repo = OSMRepo()
+
+    def test_init_repo_structure(self):
+        # TODO: Mock filesystem after refactoring from os to pathlib
+        # TODO: Mock OSM IM repo if possible
+        repo_base = Path(__file__).parent / Path("test_repo")
+        expected_index_file_path = repo_base / Path("index.yaml")
+        self.repo.init_directory(str(repo_base))
+        self.assertTrue(expected_index_file_path.exists())
+        shutil.rmtree(expected_index_file_path.parent)
diff --git a/osmclient/sol005/tests/test_vca.py b/osmclient/sol005/tests/test_vca.py
index 25a2aeb..aa5eb2d 100644
--- a/osmclient/sol005/tests/test_vca.py
+++ b/osmclient/sol005/tests/test_vca.py
@@ -55,7 +55,7 @@
         self.vca._http.post_cmd.assert_called()
         mock_print.assert_not_called()
 
-    def test_update_sucess(self):
+    def test_update_success(self):
         self.vca.get = Mock()
         self.vca.get.return_value = {"_id": "1234"}
         self.vca.update("vca_name", self.vca_data)