Legacy firmware (2.x): ValueError in invoke() due to missing method name in response

[StevenEmelander]

Description

Legacy Vantage InFusion firmware (2.x) omits the method name from invoke() responses, causing a ValueError during tuple unpacking that crashes controller initialization.

Root Cause

Legacy firmware uses a shorter response format:

Modern:  R:INVOKE <vid> <result> Load.GetLevel [args...]
Legacy:  R:GETLOAD <vid> <result>

The current unpacking requires 4+ tokens:

_command, _vid, result, _method, *args = Converter.tokenize(return_line)

Error

ValueError: not enough values to unpack (expected at least 4, got 3)

Environment

• aiovantage: 0.22.8
• Vantage InFusion firmware: 2.x (legacy, cannot be upgraded)

[davenaum]

@loopj any chance we can get a release with this fix along with a subsequent release of home-assistant-vantage? The integration is currently non-functional for those of us running older firmwares. Thanks!