Warning
After the latest firmware update, your Grizzl-E charger will no longer work with your OCPP server in Home Assistant.
- As of September 10, 2025, United Chargers announced that it is temporarily not possible to connect their charger to a custom OCPP server other than their own.
- This issue has been ongoing for over a month and is expected to last for about another month.
The intercepted error looks like this:
In short:
{"configurationKey":],"unknownKey":["MeterValuesSampledData"]} is invalid → the charger disconnects from the OCPP server.
This GitHub patch simply intercepts that malformed message and ignores it, allowing the charger to keep working with Home Assistant.
✅ As long as you do not update the firmware, your charger will continue to work correctly with Home Assistant.
This is a temporary version awaiting the necessary fixes from United Chargers for the compatibility of the Grizzl-E Smart charger with the OCPP standards used in the original version created by lbbrhzn.
From lbbrhzn/ocpp V0.6.3, patched for Grizzl-E Smart charger.
Tested with the firmware: GWM-07.027-03_GCW-10.22-05.7
Add the integration with the default instalation.
From your charger, set the server: the ws://homeassistant.local:9000/
All other information is in the documentation you can found here home-assistant-ocpp.readthedocs.io
- based on the Python OCPP Package.
- HACS compliant repository
💡 Tip: If you like this project consider buying a coffee or a cocktail to lbbrhzn:
