Yes output from renogy Rover is modbus format
see micropython implementation ble on raspberry
wanted to migrate this to eSPhome https://github.com/cyrils/renogy-bt
I think there is some misunderstanding .
Renogy talks modbus over rs485, Ble module BT-2 converts that to Ble. I don’t see any modbus over Ble.
So if you want to read modbus from Renogy, do it with Esphome and rs485 converter.