[Solved] - Error "ModuleNotFoundError: No module named 'pymodbus.client.sync'"

[vinchz31]

Hello to all,
I use SolarEdge Modbus to import into domoticz (with the plugin "Solaredge Modbus TCP for Domoticz" (https://github.com/addiejanssen/domoticz-solaredge-modbustcp-plugin).

I was on Raspberry Buster (Python 3.7) and everything worked fine.
I reinstalled a Bullseye version on Raspberry (which has Python 3.9.2) and wanted to install SolarEdge Modbus again.

Everything seems to be going well, both for the installation of SolarEdge Modbus :

sudo pip3 install solaredge_modbus
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting solaredge_modbus
  Downloading https://www.piwheels.org/simple/solaredge-modbus/solaredge_modbus-0.7.2-py3-none-any.whl (11 kB)
Collecting pymodbus>=3.0.0
  Downloading https://www.piwheels.org/simple/pymodbus/pymodbus-3.2.0-py2.py3-none-any.whl (159 kB)
     |████████████████████████████████| 159 kB 1.6 MB/s
Collecting pyserial-asyncio>=0.6.0
  Downloading https://www.piwheels.org/simple/pyserial-asyncio/pyserial_asyncio-0.6-py3-none-any.whl (7.5 kB)
Requirement already satisfied: setuptools<66.0.0 in /usr/lib/python3/dist-packages (from pymodbus>=3.0.0->solaredge_modbus) (52.0.0)
Requirement already satisfied: pyserial in /usr/lib/python3/dist-packages (from pyserial-asyncio>=0.6.0->solaredge_modbus) (3.5b0)
Installing collected packages: pyserial-asyncio, pymodbus, solaredge-modbus
Successfully installed pymodbus-3.2.0 pyserial-asyncio-0.6 solaredge-modbus-0.7.2

But also for the installation of the Domoticz plugin:

sudo pip3 install -r requirements.txt
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting solaredge_modbus==0.7.0
  Downloading https://www.piwheels.org/simple/solaredge-modbus/solaredge_modbus-0.7.0-py3-none-any.whl (10 kB)
Requirement already satisfied: pymodbus>=2.4.0 in /usr/local/lib/python3.9/dist-packages (from solaredge_modbus==0.7.0->-r requirements.txt (line 1)) (3.2.0)
Requirement already satisfied: setuptools<66.0.0 in /usr/lib/python3/dist-packages (from pymodbus>=2.4.0->solaredge_modbus==0.7.0->-r requirements.txt (line 1)) (52.0.0)
Installing collected packages: solaredge-modbus
  Attempting uninstall: solaredge-modbus
    Found existing installation: solaredge-modbus 0.7.2
    Uninstalling solaredge-modbus-0.7.2:
      Successfully uninstalled solaredge-modbus-0.7.2
Successfully installed solaredge-modbus-0.7.0

Problem: Contrary to before, when starting the plugin in domoticz I get the following message (as if the module "pymodbus.client.sync" was not installed).

2023-03-19 10:58:47.494 Status: Solaire: Entering work loop.
2023-03-19 10:58:47.494 Status: Solaire: Started.
2023-03-19 10:58:48.163 Error: Solaire: (SolarEdge_ModbusTCP) failed to load 'plugin.py', Python Path used was '/home/pi/domoticz/plugins/Solaredge/:/usr/lib/python39.zip:/usr/lib/python3.9:/usr/lib/python3.9/lib-dynload:/usr/local/lib/python3.9/dist-packages:/usr/lib/python3/dist-packages:/usr/lib/python3.9/dist-packages'.
2023-03-19 10:58:48.166 Error: Solaire: Traceback (most recent call last):
2023-03-19 10:58:48.166 Error: Solaire: File "/home/pi/domoticz/plugins/Solaredge/plugin.py", line 54, in <module>
2023-03-19 10:58:48.166 Error: Solaire: import solaredge_modbus
2023-03-19 10:58:48.166 Error: Solaire: File "/usr/local/lib/python3.9/dist-packages/solaredge_modbus/__init__.py", line 7, in <module>
2023-03-19 10:58:48.166 Error: Solaire: from pymodbus.client.sync import ModbusTcpClient
2023-03-19 10:58:48.166 Error: Solaire: ModuleNotFoundError: No module named 'pymodbus.client.sync'

I have seen the problem #62 which is similar.
I tried to make a I tried to do a "python3 -m pip install --upgrade solaredge_modbus" which went well but did not solve the problem

I then modified the "nano init.py" file to replace "pymodbus.client.sync" by "pymodbus.client" and indeed the module starts but it doesn't work at all afterwards (I get many errors):

2023-03-19 11:58:06.076 Error: SolarEdge: Call to function 'onHeartbeat' failed, exception details:
2023-03-19 11:58:06.078 Error: SolarEdge: Traceback (most recent call last):
2023-03-19 11:58:06.078 Error: SolarEdge: inverter_values = self.inverter.read_all()
2023-03-19 11:58:06.078 Error: SolarEdge: File "/usr/local/lib/python3.9/dist-packages/solaredge_modbus/__init__.py", line 394, in read_all
2023-03-19 11:58:06.078 Error: SolarEdge: results.update(self._read_all(register_batch, rtype))
2023-03-19 11:58:06.078 Error: SolarEdge: File "/usr/local/lib/python3.9/dist-packages/solaredge_modbus/__init__.py", line 330, in _read_all
2023-03-19 11:58:06.078 Error: SolarEdge: data = self._read_holding_registers(offset, length)
2023-03-19 11:58:06.078 Error: SolarEdge: File "/usr/local/lib/python3.9/dist-packages/solaredge_modbus/__init__.py", line 224, in _read_holding_registers
2023-03-19 11:58:06.078 Error: SolarEdge: result = self.client.read_holding_registers(address, length, unit=self.unit)
2023-03-19 11:58:06.078 Error: SolarEdge: File "/usr/local/lib/python3.9/dist-packages/pymodbus/client/mixin.py", line 103, in read_holding_registers
2023-03-19 11:58:06.078 Error: SolarEdge: pdu_reg_read.ReadHoldingRegistersRequest(address, count, slave, **kwargs)
2023-03-19 11:58:06.078 Error: SolarEdge: TypeError: __init__() got multiple values for argument 'unit'

etc...

Would you know how to solve this problem?
Thanks in advance for your help!

[vinchz31]

The solution explained in addiejanssen/domoticz-solaredge-modbustcp-plugin#62 is working fine for me. Hope it will help other poeple !