diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
new file mode 100644
index 0000000..fcd84df
--- /dev/null
+++ b/.github/workflows/tests.yml
@@ -0,0 +1,16 @@
+name: Tests
+
+on:
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [main]
+
+jobs:
+  lint:
+    runs-on: [self-hosted, cluster.loopingz.com]
+    steps:
+      - uses: actions/checkout@v2
+      # black formatting
+      - uses: psf/black@stable
+        with:
+          options: "--line-length 100 --check --diff"
diff --git a/.gitignore b/.gitignore
index b7faf40..335eb43 100644
--- a/.gitignore
+++ b/.gitignore
@@ -205,3 +205,6 @@ cython_debug/
 marimo/_static/
 marimo/_lsp/
 __marimo__/
+
+# Configuration
+config.yml
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..c11fa8b
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,9 @@
+{
+  "[python]": {
+    "editor.defaultFormatter": "ms-python.black-formatter",
+    "editor.formatOnSave": true,
+  },
+
+  "black-formatter.args": ["--line-length", "100"],
+  "pylint.args": ["--disable=W0401, W0614, W1514"]
+}
\ No newline at end of file
diff --git a/README.md b/README.md
index 8da0517..a72287d 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,22 @@
-# modalshift
+# MODALSHIFT
+
 Open developments for MODALSHIFT EU project
+
+## Configuration file
+
+Put a file name config.yml at root.
+
+Here is an example configuration.
+
+```yaml
+S3_server: https://url
+S3_id_env_name: S3_ID
+S3_secret_env_name: S3_SECRET
+output_directory: data/ 
+```
+
+## Download a file
+
+```python
+python3 src/get_data_from_S3.py
+```
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..97033fe
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,4 @@
+black~=25.1.0
+tqdm==4.66.4
+botocore==1.41.0
+boto3==1.41.0
\ No newline at end of file
diff --git a/src/functions.py b/src/functions.py
new file mode 100644
index 0000000..52b4731
--- /dev/null
+++ b/src/functions.py
@@ -0,0 +1,91 @@
+"""
+Functions
+"""
+
+import os
+import boto3
+import botocore
+import tqdm
+import yaml
+
+# get configuration
+with open("../config.yml", "r") as ymlfile:
+    config = yaml.load(ymlfile, Loader=yaml.FullLoader)
+
+S3_SERVER = config["S3_server"]
+S3_ID_ENV_NAME = config["S3_id_env_name"]
+S3_SECRET_ENV_NAME = config["S3_secret_env_name"]
+OUTPUT_DIRECTORY = config["output_directory"]
+DOWNLOAD_FILE = config["download_file"]
+OUTPUT_FILE = config["output_file"]
+
+# make output directory
+if not os.path.exists(OUTPUT_DIRECTORY):
+    os.mkdir(OUTPUT_DIRECTORY)
+
+# init S3 session
+session = boto3.Session()
+
+S3_CLIENT = session.client(
+    service_name="s3",
+    aws_access_key_id=os.environ[S3_ID_ENV_NAME],
+    aws_secret_access_key=os.environ[S3_SECRET_ENV_NAME],
+    endpoint_url=S3_SERVER,
+)
+
+
+def download_object_from_s3_with_progress(client, *, bucket, key, version_id=None, filename):
+    """
+    Download an object from S3 with a progress bar.
+
+    From https://alexwlchan.net/2021/04/s3-progress-bars/
+    """
+    s3 = client
+
+    # First get the size, so we know what tqdm is counting up to.
+    # Theoretically the size could change between this HeadObject and starting
+    # to download the file, but this would only affect the progress bar.
+    kwargs = {"Bucket": bucket, "Key": key}
+
+    if version_id is not None:
+        kwargs["VersionId"] = version_id
+
+    object_size = s3.head_object(**kwargs)["ContentLength"]
+
+    # Now actually download the object, with a progress bar to match.
+    # How this works:
+    #
+    #   -   We take manual control of tqdm() using a ``with`` statement,
+    #       see https://pypi.org/project/tqdm/#manual
+    #
+    #   -   We set ``unit_scale=True`` so tqdm uses SI unit prefixes, and
+    #       ``unit="B"`` means it adds a "B" as a suffix.  This means we get
+    #       progress info like "14.5kB/s".
+    #
+    #       (Note: the "B" is just a string; tqdm doesn't know these are
+    #       bytes and doesn't care.)
+    #
+    #   -   The Callback method on a boto3 S3 function is called
+    #       periodically during the download with the number of bytes
+    #       transferred.  We can use it to update the progress bar.
+    #
+    if version_id is not None:
+        ExtraArgs = {"VersionId": version_id}
+    else:
+        ExtraArgs = None
+
+    with tqdm.tqdm(total=object_size, unit="B", unit_scale=True, desc=filename) as pbar:
+        download_object_from_s3(
+            s3,
+            bucket,
+            key,
+            filename,
+            ExtraArgs,
+            lambda bytes_transferred: pbar.update(bytes_transferred),
+        )
+
+
+def download_object_from_s3(client, bucket, key, filename, extraArgs=None, callback=None):
+    client.download_file(
+        Bucket=bucket, Key=key, ExtraArgs=extraArgs, Filename=filename, Callback=callback
+    )
diff --git a/src/get_data_from_S3.py b/src/get_data_from_S3.py
new file mode 100644
index 0000000..7db2ea7
--- /dev/null
+++ b/src/get_data_from_S3.py
@@ -0,0 +1,26 @@
+"""
+Get data from S3
+"""
+
+# %%
+# imports
+
+from functions import (
+    download_object_from_s3_with_progress,
+    OUTPUT_DIRECTORY,
+    S3_CLIENT,
+    DOWNLOAD_FILE,
+    OUTPUT_FILE,
+)
+
+# %%
+# download
+
+download_object_from_s3_with_progress(
+    S3_CLIENT,
+    bucket="tellae-mobility-bots",
+    key=DOWNLOAD_FILE,
+    filename=f"{OUTPUT_DIRECTORY}/{OUTPUT_FILE}",
+)
+
+# %%
diff --git a/src/list_files.py b/src/list_files.py
new file mode 100644
index 0000000..6396d65
--- /dev/null
+++ b/src/list_files.py
@@ -0,0 +1,80 @@
+"""
+Get data from S3
+"""
+
+# %%
+# imports
+
+from functions import (
+    OUTPUT_DIRECTORY,
+    S3_CLIENT,
+    botocore,
+    download_object_from_s3_with_progress,
+)
+
+
+# %%
+#
+
+# %%
+# test listing folders and counting files
+
+
+def list_folder_objects(client, bucket, prefix):
+    file_list = []
+    for key in client.list_objects(Bucket=bucket, Prefix=prefix)["Contents"]:
+        file_list.append(key["Key"])
+
+    return file_list
+
+
+bucket = "tellae-mobility-bots"
+prefix_list = [
+    "GTFS-RT/renfe/",
+    "gtfs/renfe-cercanias/",
+    "gtfs/",
+    "gbfs/",
+    "GTFS-RT/bibus/",
+]  # Make sure you provide / in the end
+
+for prefix in prefix_list:
+    print("******", prefix, "******")
+    try:
+        result = S3_CLIENT.list_objects(Bucket=bucket, Prefix=prefix, Delimiter="/")
+
+        common_prefixes = result.get("CommonPrefixes")
+        if not common_prefixes is None:
+            for o in result.get("CommonPrefixes"):
+                print("sub folder : ", o.get("Prefix"))
+                print("# files: ", len(list_folder_objects(S3_CLIENT, bucket, prefix)))
+        else:
+            print("no sub folder")
+            print("# files: ", len(list_folder_objects(S3_CLIENT, bucket, prefix)))
+
+    except botocore.exceptions.ClientError as e:
+        print(e)
+
+# %%
+# test downloading files
+
+files = [
+    "gtfs/madrid-metro-ligero/gtfs_madrid-metro-ligero_2025-11-11.zip",
+    "GTFS-RT/renfe/bus_position_20250907_renfe.csv.bz2",
+    "gbfs/auray/2025-02-02_auray.csv.bz2",
+    "GTFS-RT/bibus/bus_position_20240102_bibus.csv.bz2",
+]
+
+for file in files:
+    print("*******", file, "******")
+    try:
+        download_object_from_s3_with_progress(
+            client=S3_CLIENT,
+            bucket=bucket,
+            key=file,
+            filename=f"{OUTPUT_DIRECTORY}/{file.replace('/', '_')}",
+        )
+    except botocore.exceptions.ClientError as e:
+        print(e)
+
+# %%
+#