Fix write_registers calling after the upgrade of pymodbus to 3.8.x

[crug80]

Breaking change

Proposed change

Pymodbus requires for write_registers function a list of integer and a list of bool for write_coils

Actually this requirements is satisfied only in the Climate component, where specific config parameters help the modbus climate to pass correctly the values to underlying pymodbus library.
Switches, lights or fans, instead, use a different approach. I suppose that in the older version of the library this lack was fixed by the library itself, now instead this has generated the impossibility to use the modbus component in those users who need to use coils/holdings registers for switches/fans/lights as tracked in several issues.

This PR before to call write_registers or write_coils, check if the value is correctly a list and it forces to a list in case it is not.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Modbus issue - Working YAML stopped working since 25.2.0 #138443
• This PR is related to issue: Modbus TCP Integration Issues Since Core 2025.2 #138529 (comment)
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

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[bdraco]

Thanks @crug80