What does it mean when openDTU appears on the display?

[rete04]

Hi, I installed the latest firmware version on an ESP32-S3, I configured the network, the inverter, the meter, the interface to the NFR24 and also the JK BMS interface but strangely it does not connect to the inverter, after a while it displays the battery data it disconnects and on the display instead of reporting the graph and the operating data it says openDTU.
I can't understand why it doesn't work, I currently have an ESP32 running with an old firmware configured on the same inverter and with the interface activated on a vivtron smartshunt and it's working.
I really don't understand what's going on.
Do you have any ideas?

[schlimmchen]

instead of reporting the graph and the operating data it says openDTU

The ESP32 rebooted. Are you experiencing a bootloop?