Is your feature request related to a problem? Please describe.
FoxEss Chargers are supported via OCPP in EVCC right now (Sponsor token needed.)
But OCPP is lacking in FoxESS, for example Phase-changing is not supported by OCPP but is by Modbus-TCP.

Describe the solution you'd like
Add Modbus TCP to Foxess chargers

I can provide the original "Fox ESS EV Charger Modbus TCP Protocol 1.6" PDF if needed.

This is what I found using claude AI, unfortunately I am not fit to create a PR by myself

Thank you!