TheDragon (GivEnergy) Thank you for acknowledging the issue. I can understand that it is not high priority, and might be quite challenging to fix. However fixing it properly could have many benefits.
In fact, in home mode, the app has always sent data to the portal. The change is that the app is now sending VALID data, whereas previously it was invalid and rejected by the portal. Hence there is no increase in network traffic.
The portal must send back an acknowledgement of the data it receives (valid or not), and failing to receive acknowledgements can cause the app to halt and the dongle to flash. Hence the app in home mode needs a good connection to the portal! This is one reason why home mode can be flaky.
Fixing it properly may require changes to the app, and the inverter firmware, and possibly the portal. But there is scope here for improving the reliability of the app if done well.