Update modbus integration to use pymodbus 2.5.1 when available/stable

[janiversen]

The problem

A number of reported problems with the modbus integration is in reality problems in the 3rd party library.

Currently pymodbus 2.3.0 is used by the modbus integration. Pymodbus 2.5.0 is the newest version, but there are a tcp problem in that release so we wait to see a stable 2.5.1

This PR keeps track of the open issues and PR in pymodbus relevant for our integration.

The expectation is to close this PR when pymodbus 2.5.1 gets released.

Issues:
pymodbus-dev/pymodbus#510
Firsrst message is rejected

pymodbus-dev/pymodbus#496 (async error)
asyncio ModbusTCPFramer problems with splited answer

pymodbus-dev/pymodbus#560

Pull requests:
pymodbus-dev/pymodbus#511
better fix for rtu incomplete frames

pymodbus-dev/pymodbus#504
Fix comment and assertions in synchronous_client.py

pymodbus-dev/pymodbus#403
exception raising on incomplete message

Environment

• Home Assistant Core release with the issue:
• Last working Home Assistant Core release (if known):
• Operating environment (OS/Container/Supervised/Core):
• Integration causing this issue:
• Link to integration documentation on our website:

Problem-relevant configuration.yaml

Traceback/Error logs

Additional information

[janiversen]

Maintainers: feel free to assign this one to me.

[probot-home-assistant]

Hey there @adamchengtkc, @vzahradnik, mind taking a look at this issue as its been labeled with an integration (modbus) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[dhoomakethu]

Cross referencing this from pymodbus-dev/pymodbus#521.
Please give it a spin with 2.5.0rc2. You can install from https://pypi.org/project/pymodbus/2.5.0rc2/ .
Refer https://github.com/riptideio/pymodbus/releases

[dhoomakethu]

2.5.0 is officially released. Please check and report if any of the issues are still not resolved.

[janiversen]

Just filed PR #48585 to bump version.

[dhoomakethu]

2.5.0 has a know regression which disconnects clients on each transaction. Please use 2.5.1rc1

[janiversen]

@vzahradnik seems you got the afternoon free (I closed the PR), thank for volunteering.

I am currently testing a bit with the pymodbus 3.0.0 branch, just to see when we can switch to async.

[dhoomakethu]

pymodbus 2.5.1 is officially released. Thanks

[janiversen]

Thanks, I just saw it. Lets wait some days, and see if it is stable.