Missing firmware/hardware version fields in pypvs models (regression from dl_cgi)

[smcneece]

pypvs library currently doesn't provide firmware and hardware version fields for inverters, meters, and ESS devices, causing a data regression compared to the legacy dl_cgi endpoint.

Old Firmware (dl_cgi endpoint) provided:

Inverters:

"hw_version": "4403",
"SWVER": "4.21.4"

Battery devices:

"hw_version": "4.51",
"SWVER": "2.8"

ESS device:

"hw_version": "0",
"SWVER": "0"

Power Meters:

"SWVER": "3000"

pypvs currently provides:

• ❌ PVSInverter model: No firmware/hardware fields
• ❌ PVSESS model: No firmware/hardware fields
• ❌ PVSMeter model: No firmware/hardware fields
• ✅ gateway (PVS device): Has software_version and hardware_version ✓

Impact:

Home Assistant integrations using pypvs now show "Firmware: Unknown Hardware: Unknown" for all inverters, meters, and battery devices, which looks broken to users. This information was available in the old dl_cgi format and should be preserved in the new LocalAPI/pypvs implementation.

Requested Enhancement:

Add firmware/hardware version fields to pypvs models:

@dataclass(slots=True)
class PVSInverter:
    serial_number: str
    model: str
    software_version: str  # NEW
    hardware_version: str  # NEW
    # ... existing fields

Similar additions needed for PVSESS and PVSMeter models.

Varserver Data Source:

The /sys/devices/inverter/, /sys/devices/ess/, and /sys/devices/meter/ varserver endpoints likely contain these fields (similar to how /sys/info provides gateway versions). The from_varserver() methods would need to extract them.

Workaround:

Currently using placeholders ("SWVER": "pypvs", "HWVER": model) to avoid showing "Unknown" in UI, but this loses valuable diagnostic information that was previously available.

[smcneece]

Update: Found another missing field - Battery Current/Amperage

While implementing ESS support, I discovered battery current data is also missing from the pypvs PVSESS model:

Old firmware (dl_cgi ESS endpoint):

• Provided battery_amperage field ✅
• Enabled power input/output calculation: power = amperage * voltage

New firmware (pypvs PVSESS model):

• No current/amperage field ❌
• Cannot determine charging vs discharging from current direction
• Cannot calculate power input/output

Checked varserver-variables-public.csv - didn't see any ESS current variable listed under /sys/devices/ess/{index}/.

Request: If battery current exists in varserver but just isn't extracted, could you add something like battery_current_a or i_batt_a to the PVSESS model? This would restore full battery monitoring parity with the old
firmware.

Thanks for all your work on this library!