mht-siemens/solution/client/todo.md

TODO - PLC Client Web Project

Objectives

• Implement a Flask web server to display PLC data.
• Replicate plc_client.py output in the web interface.
• Improve S7 connection management (robust connection, clean exit).
• Use external HTML/CSS/JS files.

Tasks

1. Infrastructure & Setup

• Create todo.md (Done)
• Create folder structure:
  • templates/ (for HTML)
  • static/css/ (for CSS)
  • static/js/ (for JS)
• Initialize Flask app in plc_client_web.py.

2. Backend Logic (Migration from plc_client.py)

• Analyze plc_client.py to identify core logic (polling, parsing, S7 connection).
• Refactor S7 communication into a separate class or thread-safe module.
• Implement robust connection handling (reconnect on failure, clean exit).
• Implement data polling loop that updates a shared state (e.g., a global variable or a thread-safe object).

3. Frontend & Integration

• Create templates/index.html.
• Create static/css/style.css.
• Create static/js/script.js to fetch data from the Flask server via AJAX/Fetch API.
• Create Flask routes to serve the page and provide data as JSON.

4. Refinement

• Match plc_client.py output exactly (initial phase).
• Optimize polling frequency and UI updates.
• Error handling and logging for the web version.

Next Steps

• Transition from hardcoded DB names (DB900, DB901, etc.) to a configurable array of memory objects.
• Implement a persistent data logging system to save sessions to JSON/Database.
• Add advanced chart types (e.g. Histograms, multi-axis charts).