Hello Toben,
I have just installed your E3/DC tool, thank you very much for your work, it works really well if you can connect to the house power station.
Initial we had connection problems with the E3/DC S20x pro. The error message was invalid authentication.
After a lengthy search by my son, who is profound with computers, we found out that using an RSCP password (AES key) with 32 characters solved the problem.
We have not found out the exact cause of the error. But maybe we can help other users with this answer.
Best regards
Marco