My SolArk inverter came with a wifi dongle that uses Modbus over RS232 to interface with the inverter. I removed the dongle and connected a Pi to provide a Modbus-over-TCP interface that I can use from Home Assistant. I got more control (the officially-supported Modbus interface is read-only), and SolArk no longer has any access to my equipment.

That's a nice trick. I should try that.