Protocol looks like its the same as my BSLBATT 100ah rack battery.
BMS is PACE, RS-232 doc attached. I created a simple esphome project to extract the data.
This guy made a python script: https://github.com/Tertiush/bmspace
I have a genuine (non-growatt) SDM630 v2.
After changing the address it has been working fine for 4 months with my growatt SPH Inverter!
From my previous research nothing special about the growatt edition, besides the default modbus address.