Activate vacationmode from HA

[ettorsson]

I think it would be nice if i can let home assistent to set SigAI in vacation mode.
I don't know if it is possible but it would be nice.

[TypQxQ]

This would be useful, but unfortunately it is not currently possible through the local Modbus integration.

Sigenergy's current Modbus protocol (v2.9) does not expose a readable or writable register for SigAI Vacation Mode. The protocol reports the plant's EMS work mode, including AI Mode, but Vacation Mode is a separate SigAI feature and is not one of the available Modbus controls. Selecting AI Mode from Home Assistant would therefore not activate Vacation Mode.

The integration can only safely expose controls that Sigenergy documents and makes available through local Modbus. For now, Vacation Mode must be activated in the mySigen app. I would not recommend trying undocumented raw register writes.

If Sigenergy adds a documented Vacation Mode register in a future Modbus specification, we can revisit this and expose it as a Home Assistant control.