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Offline mode (no cloud)

The stromleser.one can be used in both ‌ways- integration with Cloud and locally without Cloud as well. This feature facilitates all the users who use home automation and other mqtt based smart home systems.

In offline mode:

  • the stromleser.one continues to send readings locally via MQTT (e.g. to Home Assistant).
  • the local web interface remains accessible via the device IP in your home network.
  • the local API stays available.
  • no data is sent to the cloud.
Recommendation

Offline mode is best suited for instances when you do not need a cloud history and when you want access to the readings through Home Assistant.

Prerequisites​

Before enabling offline mode, you should:

  • set up the stromleser.one normally using the app (including the initial cloud connection).
  • have the stromleser.one connected to your MQTT broker / Home Assistant.
  • know the IP address of your stromleser.one in your home network.
    • e.g. from your router's device list or from the app

What still works in offline mode?​

Even without cloud connection, the stromleser.one continues to run and provide data in the following ways:

MQTT / Home Assistant​

All readings are still sent locally via MQTT. Your Home Assistant (or other MQTT‑based system) can receive and record these values as usual.

Local web interface​

The web UI at http://<stromleser-one-ip>/ remains fully accessible. Here you can, for example, use Recalibrate Total & Multiplier to adjust the counter value and multiplier.

Local API​

The stromleser.one local API stays available and can still be queried from your network.

What no longer works?​

When the cloud connection is disabled, the following no longer works:

No cloud history​

  • The energieleser app will no longer have cloud‑based data history.
  • You need to record the history yourself, e.g. in Home Assistant.

Limited app usage​

  • While on your home Wi‑Fi you often still see the last known value on the app,
    but when you leave the Wi‑Fi, values are no longer updated.
  • The online indicator disappears in the app.

No OTA updates​

  • Firmware updates via the cloud are not possible in offline mode.
  • To update the device, temporarily re‑enable the cloud connection.

Possible total rollback after power loss​

  • The web interface shows a note:

    If power is cut off, the total may fall back to an older value due to limited memory on the device. The backup is saved periodically, not on every pulse.

  • This means that after a prolonged power outage, the internally stored total reading may fall back to an older value.
After a power outage

After a longer power cut, compare the total shown in the web interface with the value on your physical energy meter. If necessary, correct the counter via Recalibrate Total & Multiplier.

Re‑enabling the cloud connection​

You can switch back to normal cloud operation at any time. For detailed instructions, see the Re-enable cloud connection page.

Best practices for offline mode​

  • Use it only if you have your own logging system

    • e.g. Home Assistant with long‑term history.

  • Regularly compare meter readings

    • especially after power outages.

  • Temporarily enable the cloud when needed

    • e.g. for firmware updates or when you want to use the app with full functionality again.

With this setup you get the best of both worlds:
Local control and data ownership via Home Assistant / MQTT – with the option to re‑enable the cloud whenever you need it.