Hey there, I have a flatpack2 (non-HE) 48v/2000.
I'm able to send a login message to 0x05004804 with the serial number successfully. After login, for 5 seconds I see messages come from 05014004 with status.
I'm also able to send messages to 0x05019C00 with data (0x29, 0x15, 0x00, 0xC0, 0x12)...