I have created a VenusOS driver that can talk to BMS/Batteries that has serial communications (instead of the normal CANbus). RS485/RS232/TTL/UART and Venus 2.80+ have been tested.
Currently it works with
JBD BMS (LLT Power / Overkill Solar)
Daly BMS (Daly Smart BMS / Daly Sinowealth based...