fronius_modbus fails to load on Home Assistant 2026.7 due to pymodbus API break (unpack_bitstring missing)

[Schmider112]

Environment
Home Assistant Core: 2026.7.0
Home Assistant OS: 18.1
Installation type: HA OS on Proxmox (qemu x86_64)
Python version: 3.14 (bundled with HA Core)
Integration: fronius_modbus (HACS)
Version: 0.19
Inverter: Fronius GEN24 Plus
Modbus connection: TCP

Problem description
After upgrading to Home Assistant Core 2026.7, the fronius_modbus integration fails to load completely.
The integration throws an import error during startup and is not available in Home Assistant.

Error logs
Setup failed for custom integration 'fronius_modbus': Unable to import component:
cannot import name 'unpack_bitstring' from 'pymodbus.utilities'
(/usr/local/lib/python3.14/site-packages/pymodbus/utilities.py)
Full traceback also shows:
Unexpected exception importing component custom_components.fronius_modbus
Detected blocking call to import_module

[mhurk]

This is caused by a changed location of unpack_bitstring. It is already solved in the latest vesion (2.3.0). Wait until it is available in HA.
or do a manual change:

in /homeassistant/custom_components/solaredge_modbus/payload.py change line 20:
from pymodbus.pdu.pdu import pack_bitstring, unpack_bitstring
to
from pymodbus.pdu.utils import pack_bitstring, unpack_bitstring

[Schmider112]

Thanks that works