A utility to change filenames exported from Sigma Data Center (as .fit) to a format that can be copied to the Activities directory of an ROX 4.0 so it is synced back into the Sigma Ride App. The `D4790161BC34` part might be specific to your ROX 4.0, so it you maybe have to replace that one.

sigma-data-center-rename.py

import os
import uuid
import datetime
import shutil
import sys
from fitparse import FitFile

def extract_activity_start_time(fit_path):
    """Extracts the activity start time from a .fit file."""
    try:
        fitfile = FitFile(fit_path)
        for record in fitfile.get_messages("session"):  # Extract session start time
            for data in record:
                if data.name == "start_time":
                    return data.value.strftime("%Y-%m-%d_%H-%M-%S")
    except Exception as e:
        print(f"Error reading {fit_path}: {e}")
    return None

def extract_file_id_data(fit_path):
    """Extracts the file_id field 200 value and time_created timestamp from the .fit file."""
    try:
        fitfile = FitFile(fit_path)
        for record in fitfile.get_messages("file_id"):  # Extract file_id data
            file_id = None
            time_created = None
            for data in record:
                if data.name == "unknown_200":
                    file_id = str(data.value).upper()
                    if "-" in file_id:
                        parts = file_id.rsplit("-", 1)
                        file_id = f"{parts[0]}-D4790161BC34"  # Replace last part
                if data.name == "time_created":
                    time_created = record.get_raw_value("time_created")
            if file_id and time_created:
                return file_id, f"{time_created}000"  # Append 3 extra zeroes to time_created
    except Exception as e:
        print(f"Error reading file_id from {fit_path}: {e}")
    return None, None

def process_directory(source_directory, target_directory):
    """Copies all .fit files from source to target directory with new names."""
    if not os.path.exists(target_directory):
        os.makedirs(target_directory)

    for filename in os.listdir(source_directory):
        if filename.endswith(".fit"):
            original_path = os.path.join(source_directory, filename)
            activity_start_time = extract_activity_start_time(original_path)
            file_id, timestamp_part = extract_file_id_data(original_path)
            print(timestamp_part)
            if not activity_start_time or not file_id or not timestamp_part:
                print(f"Skipping {filename}: Unable to extract required metadata")
                continue
            new_filename = f"{activity_start_time}_{file_id}_{timestamp_part}_4.fit"
            new_path = os.path.join(target_directory, new_filename)
            shutil.copy2(original_path, new_path)
            print(f"Copied: {filename} -> {new_filename}")

def main():
    if len(sys.argv) != 3:
        print("Usage: python script.py <source_directory> <target_directory>")
        sys.exit(1)

    source_directory = sys.argv[1]
    target_directory = sys.argv[2]

    if not os.path.isdir(source_directory):
        print("Invalid source directory!")
        sys.exit(1)

    process_directory(source_directory, target_directory)

if __name__ == "__main__":
    main()